Device for controlling flow-state soil expansion range in karst area

Abstract

The utility model relates to the field of pile foundation engineering, in particular to a device for controlling the expansion range of fluid soil in a karst area, which comprises a central shaft, a sliding component, a support rod, an expansion rod and an isolating layer, the sliding assembly is arranged on the outer side of the center shaft, the sliding assembly can slide in the axial direction of the center shaft, and a traction device is arranged on the sliding assembly; the supporting rods are uniformly distributed around the central shaft, the supporting rods are parallel to the central shaft, and the number of the supporting rods is at least three; each supporting rod corresponds to at least one expansion rod, the two ends of each expansion rod are movably connected with the corresponding supporting rod and the sliding assembly respectively, and the expansion rods can drive the supporting rods to be close to or away from the center shaft. The isolation layer is arranged on the outer sides of all the supporting rods. The cast-in-situ bored pile can be lowered to a karst cave area to be unfolded before the cast-in-situ bored pile is constructed, so that the expansion range of flow-state soil is effectively controlled during flow-state soil pouring construction, resources are effectively saved while the construction quality is guaranteed, and the green and economical construction targets are achieved.

Description

Technical Field

[0001] The utility model relates to the field of pile foundation engineering, in particular to a device for controlling the expansion range of fluid soil in karst areas. Background Art

[0002] In my country's vast karst geological regions, bored cast-in-place piles, a key foundation construction technology, often face severe challenges such as grout leakage and difficult quality control. These issues not only directly lead to significant delays in project progress but also significantly increase costs, posing a serious threat to the overall project effectiveness. Traditionally, construction companies have relied on combining loose materials such as stone slabs and clay to fill karst cavities. However, this method often suffers from particle size mismatches between the various materials, resulting in gaps and frequent grout leakage, leading to a significant increase in slurry consumption. Furthermore, the filling quality is difficult to precisely control, which in turn affects the estimated side friction of the pile and weakens the bearing capacity and stability of the pile foundation.

[0003] To address this industry challenge, fluidized soil has emerged as an innovative green engineering material. Fluidized soil cleverly utilizes renewable resources such as slag, construction waste, and waste mud. Through scientific proportioning and processing, it forms an environmentally friendly and high-performance filling material. Its uniqueness lies in its high strength and excellent water stability, as well as its extremely low permeability, effectively preventing the occurrence of slurry leakage. More importantly, using fluidized soil to backfill caves can significantly improve the lateral friction resistance of cast-in-place piles without completely filling them, significantly optimizing the load-bearing performance of pile foundations and providing a new solution for construction quality assurance and control.

[0004] In the process of promoting the application of fluidized soil, in order to improve resource utilization efficiency and reduce unnecessary material waste, it is particularly important to accurately control the diffusion range of fluidized soil. In theory, in order to maximize the effectiveness of fluidized soil while ensuring construction efficiency and quality, it is recommended to accurately control the liquid soil filling range to between 3 and 5 times the pile diameter. To this end, the engineering community is actively exploring and developing special diffusion control devices. Through precise flow control and guidance design, this device ensures that the fluidized soil can be evenly and orderly distributed to the target area during the backfill process, which not only ensures the steady improvement of construction quality, but also maximizes resource utilization, demonstrating the harmonious unity of green construction and economic benefits. Therefore, the current problems of leakage and difficult quality control in bored pile construction in karst areas remain to be solved. Utility Model Content

[0005] The purpose of the utility model is to overcome the problems of leakage and difficulty in controlling the quality of bored pile construction in karst areas in the prior art, and to provide a device for controlling the expansion range of fluidized soil in karst areas. The device can be lowered into the karst cave area before the bored pile construction, thereby achieving effective control of the expansion range of fluidized soil during fluidized soil pouring construction, effectively saving resources while ensuring construction quality, and achieving green and economical construction goals.

[0006] In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

[0007] A device for controlling the expansion range of fluidized soil in karst areas, characterized by comprising a central shaft, a sliding assembly, a support rod, an expansion rod and an isolation layer;

[0008] A guide groove is provided on the side wall of the central axis, and the guide groove is arranged axially along the central axis (1);

[0009] The sliding assembly is slidably arranged in the guide groove outside the central axis, and a traction device is provided on the sliding assembly, and the traction device can drive the sliding assembly to move axially along the central axis;

[0010] The support rods are evenly distributed around the central axis, and the support rods are parallel to the central axis;

[0011] Each support rod corresponds to at least one expansion rod, and both ends of the expansion rod are movably connected to the support rod and the sliding assembly respectively, and the expansion rod can drive the support rod closer to or away from the central axis;

[0012] The isolation layer is arranged on the outside of all the struts.

[0013] A guide groove is provided on the side wall of the central axis, and the sliding assembly is arranged in the guide groove of the central axis. The guide groove restricts the sliding assembly to slide only along the axial direction of the central axis. The sliding assembly is connected to one end of the expansion rod, and the other end of the expansion rod is connected to the support rod. The direction of the support rod is parallel to the direction of the central axis. The traction device is connected to the sliding assembly, and the isolation layer is arranged on the outside of all the support rods and fixed to the support rods. After the device is assembled, it is placed in the fluidized soil pouring area. The traction device drives the sliding assembly to slide up and down in the direction of the central axis. During the sliding process, the sliding assembly drives the expansion rod to rotate, and then drives the support rod to expand outward and contract inward. When the support rod is expanded, it can support the isolation layer. The isolation layer forms a side closed structure, which controls the fluidized soil within the isolation layer and prevents the fluidized soil from flowing out.

[0014] Preferably, the sliding assembly is divided into an upper slider and a lower slider, the upper slider is connected to the upper part of the support rod through an expansion rod, and the lower slider is connected to the lower part of the support rod through the expansion rod.

[0015] When the upper and lower sliders move, the expansion rod drives the outer support rods to expand outward.

[0016] Preferably, a fixed pulley is provided at the lower end of the central shaft, and the traction device can drive the upper slider to move upward, and the traction device can also drive the lower slider to move downward through the movable pulley.

[0017] By setting a fixed pulley and changing the traction direction of the traction device, the operator can achieve downward traction of the lower slider within a safe range.

[0018] Preferably, each sliding assembly is hingedly connected to 8 expansion rods, each expansion rod is evenly distributed in a circle with the central axis as the center, and the angle between adjacent expansion rods and the line connecting the center of the circle is 45°.

[0019] Preferably, the number of the struts is 8, the distribution of the struts is the same as that of the expansion rods, and the angle between adjacent struts and the line connecting the center of the circle is 45°.

[0020] Preferably, the traction device is at least one of a nylon rope, a steel wire rope or a steel cable.

[0021] Nylon rope, wire rope or steel cable has high strength and good wear resistance, and is suitable as a traction device.

[0022] Preferably, a limiting mechanism is provided on the side wall of the support rod, and the limiting mechanism can control the relative rotation between the expansion rod and the support rod.

[0023] Preferably, the limiting mechanism is a slot arranged on the side wall of the support rod, the slot is provided with a bayonet and a side groove, the end of the expansion rod is spherical, the spherical structure of the end of the expansion rod is arranged in the slot, and the expansion rod can achieve relative rotation with the support rod through the side groove.

[0024] The expansion rod rotates driven by the sliding assembly, gradually expanding the support rod. When the expansion rod is perpendicular to the support rod, the maximum expansion distance is reached. After the outer isolation layer is fully expanded, the center tube is rotated as a whole, and the expansion rod rotates to the side groove of the support rod and slides down. At this time, the center tube is pulled out upward to achieve the purpose of recycling the center tube.

[0025] Preferably, the expansion rod is connected to the sliding assembly through a hinge.

[0026] The hinged connection ensures that the expansion rod and the sliding assembly can rotate relative to each other, thereby facilitating the expansion of the support rod.

[0027] Preferably, the isolation layer is one of PVC, Oxford cloth and nylon cloth.

[0028] PVC is relatively light and waterproof and moisture-proof; Oxford cloth has excellent waterproof performance, is resistant to bending, anti-static, and has good tearing resistance; nylon cloth has the advantages of high strength, high elasticity, high heat resistance, and high corrosion resistance; the isolation layer is fixed to the support rod by gluing, and is in a folded state when the support rod is not opened. When the support rod is opened, the isolation layer is driven to open together. The isolation layer is in a taut state after the support rod is fully opened, which is convenient for standardizing the range of fluid soil.

[0029] Preferably, the support rod, central axis and expansion rod are all metal components.

[0030] The core structural support rods, central axis and expansion rods of the device are made of metal, which further ensures the overall strength of the device.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] This new type of pile can be deployed in the karst cave area before bored pile construction to prevent adverse working conditions such as mud loss and collapse during the subsequent drilling and pouring process. This preventive measure not only ensures the geological stability of the construction area, but also lays a solid foundation for subsequent fluidized soil pouring construction.

[0033] During the fluidized soil grouting construction process, effective early treatment of the karst cave area allowed the grouting operation to be carried out in a more controlled environment. This prevented slurry loss caused by the karst cave, ensured that the fluidized soil could evenly and densely fill the pile hole as per the design requirements, and significantly improved the pile quality and bearing capacity of the cast-in-place pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the utility model in an incompletely unfolded state.

[0035] Figure 2 It is a top view schematic diagram of the device of the present utility model.

[0036] Figure 3 This is a schematic diagram of the isolation layer of the utility model in a fully expanded state.

[0037] Figure 4 This is a schematic diagram of the present invention (the isolation layer is not installed).

[0038] Figure 5 This is a schematic diagram of the card slot of the present utility model.

[0039] Markings in the figure: 1-central axis, 2-support rod, 3-isolation layer, 4-sliding assembly, 41-upper slider, 42-lower slider, 5-expansion rod, 6-fixed pulley, 7-traction device, 8-slot, 81-bayonet, 82-side groove. DETAILED DESCRIPTION

[0040] In order to more clearly describe the purpose, technical solutions and technical effect advantages of the specific implementation cases of the present utility model, the solutions in the specific embodiments will be described in detail in conjunction with the drawings of the specification of the present utility model. The specific technical solutions involved in the following specific embodiments are only for the purpose of clearly and completely describing the innovative technical solutions of the present utility model. They themselves are only part of the specific implementation plans that can be adopted by the present utility model, not all examples, and should not be understood as limiting the innovative solutions of the present utility model. Any solution that adopts the same inventive concept of the present utility model should be included in the scope of protection of the present utility model.

[0041] Secondly, the description of the drawings in the specific embodiments of the present invention is only for the purpose of facilitating the understanding of the present invention by technical personnel. The details in the drawings are for the purpose of clearly presenting the technical solution. It should not be assumed that all technical features in the drawings must be included in the specific implementation cases, nor should the details in the drawings be considered as additional limitations on the innovative technical solution of the present invention. The components in the various embodiments described and shown in the drawings can be combined and arranged in different configurations. These changes in combination and arrangement should be considered as part of the entire embodiment of the innovative solution of the present invention and included in the scope of protection of the present invention.

[0042] It should be noted that, unless otherwise specified, in the description of the specific embodiments of the present invention, terms indicating orientation or positional relationships such as "upper," "lower," "left," "right," "center," "inside," and "outside" are based on the orientation or positional relationships shown in the accompanying drawings, or are the orientation or positional relationships in which the product / device / apparatus of the present invention is placed when it is conventionally used. These terms indicating orientation or positional relationships are merely for the purpose of facilitating the description of the present invention or simplifying the description of the specific embodiments to facilitate a quick understanding of the solutions by technicians, and do not indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship. Therefore, they should not be understood as limitations on the present invention.

[0043] In addition, if the terms "horizontal", "vertical", "overhanging"... etc. appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simply understood that the corresponding device / component / element is set in a specific direction such as "horizontal", "vertical", "overhanging"..., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the solution of the present utility model.

[0044] In addition, in the description of the embodiments of the present invention, "several", "a plurality", and "a number" represent at least 2. It can be 3, 4, 5, 6, 7, 8, 9, or any other number, and can even be more than 9.

[0045] Furthermore, in the description of the technical solutions of this utility model, unless otherwise expressly specified, defined, or limited, the terms "disposed," "installed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections. They may be welding, riveting, bolting, threading, or other commonly used connection methods in the art. Such connections may be mechanical or electrical, direct or indirect through an intermediate medium, or internal communication between two components.

[0046] For those skilled in the art, when understanding the solutions described in the specific embodiments of the present invention, they can refer to conventional technical manuals in the field. At the same time, for the places where the above-mentioned terms appear, they can make appropriate understanding or adjustments for reference, and deduce the implementation of the same or similar technical solutions without paying any creative work.

[0047] Example 1

[0048] like Figure 1-5As shown, a device for controlling the expansion range of fluidized soil in karst areas comprises a central shaft 1, a sliding assembly 4, a support rod 2, an expansion rod 5 and an isolation layer 3; the support rod 2, the central shaft 1 and the expansion rod 5 are all made of steel pipes, the central shaft 1 is a cylindrical structure, and a guide groove is provided on the side wall of the central shaft 1, and the guide groove is arranged axially along the central shaft (1); the sliding assembly 4 is divided into an upper slider 41 and a lower slider 42, the upper slider 41 and the lower slider 42 are both arranged in the guide groove of the central shaft 1 and can only slide along the axial direction of the central shaft 1, and the traction device 7 is a nylon rope, which is connected to the upper slider 41 and can drive the upper slider 41 to slide upward The nylon rope passes through the fixed pulley 6 at the bottom of the central axis 1 and is connected to the lower slider 42, which can drive the lower slider 42 to slide downward; there are eight struts 2, and the eight struts are evenly distributed around the central axis 1, and the direction of the struts 2 is parallel to the direction of the central axis 1; the struts 2 are respectively connected to the upper slider 41 and the lower slider 42 through the expansion rod 5, wherein the top end of the strut 2 is connected to the upper slider 41 through the expansion rod 5, and the bottom end of the strut 2 is connected to the lower slider 42 through the expansion rod 5. Through the sliding of the sliding assembly 4, the expansion rod 5 can drive the strut 2 to approach the central axis 1 or away from the central axis 1; the isolation layer 3 is arranged on the outside of all the struts 2, and the material of the isolation layer 3 is nylon cloth.

[0049] A limiting mechanism is also provided on the side wall of the support rod 2 , which is a slot 8 . The end of the expansion rod 5 is spherical and is disposed in the slot 8 . The slot 8 is provided with a bayonet 81 and a side groove 82 .

[0050] When in use, the staff places the device in the cave area, and by rotating the center tube, moves the spherical structure at the end of the expansion rod 5 into the slot 81 of the slot 8. The staff pulls the upper and lower sliders 42 with nylon ropes from above, and the upper and lower sliders 42 slide to both sides along the direction of the center axis 1. The expansion rod 5 is slowly opened, and the support rod 2 gradually expands away from the center axis 1. The nylon cloth isolation layer 3 is gradually tightened. When the expansion rod 5 is relatively perpendicular to the support rod 2, the support rod 2 is in the maximum open position, and the nylon cloth isolation layer 3 is in a tightened state. At this time, the center axis is rotated, and the guide groove on the center axis 1 drives the upper slider 41 and the lower slider 42 to rotate together, thereby driving the expansion rod 5 to rotate, and the expansion rod 5 is rotated to the side groove 82 of the support rod 2 and slides down. At this time, the center tube 1 is pulled upward, and the overall shape is as follows. Figure 3 As shown, the purpose of recycling the central tube 1 is achieved.

[0051] The utility model can be deployed in the karst cave area before the bored cast-in-place pile construction to prevent adverse working conditions such as mud leakage and collapse during the subsequent drilling and pouring process. This preventive measure not only ensures the geological stability of the construction area, but also lays a solid foundation for the subsequent fluidized soil pouring construction. During the fluidized soil pouring construction process, due to the effective treatment of the karst cave area in the early stage, the pouring operation can be carried out in a more controllable environment. It avoids the loss of slurry caused by the karst cave, ensures that the fluidized soil can fill the pile hole evenly and densely according to the design requirements, and significantly improves the pile quality and bearing capacity of the cast-in-place pile.

[0052] While ensuring the quality of construction, this utility model embodies significant resource conservation and environmental protection benefits. By reducing the waste of grouting materials and repeated construction caused by karst caves, the construction cost is effectively reduced. In addition, the interference with the surrounding environment is reduced, such as the risk of soil and water pollution caused by mud leakage is greatly reduced, which is in line with the concept of modern green construction and sustainable development. In summary, targeted treatment of the karst cave area before the construction of bored cast-in-place piles and effective control during the fluidized soil grouting construction are not only innovations and optimizations in construction technology, but also important ways to achieve green, economical and efficient construction goals.

[0053] The above embodiments describe only the basic principles, main features and / or advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and the invention content of the specification only describe the principles or specific cases of the present invention. Without departing from the essence of the innovative idea of ​​the present invention, the innovative scheme of the present invention may also have various changes and improvements, and these changes and improvements all fall within the scope of protection claimed by the present invention.

Claims

1. A device for controlling the expansion range of fluidized soil in karst areas, characterized in that: It comprises a central shaft (1), a sliding assembly (4), a support rod (2), an expansion rod (5) and an isolation layer (3); A guide groove is provided on the side wall of the central axis, and the guide groove is arranged axially along the central axis (1); The sliding assembly (4) is slidably arranged in a guide groove outside the central axis (1); a traction device (7) is provided on the sliding assembly (4); the traction device (7) can drive the sliding assembly (4) to move axially along the central axis (1); The support rods (2) are evenly distributed around the central axis (1), and the support rods (2) are parallel to the central axis (1); Each support rod (2) corresponds to at least one expansion rod (5), and both ends of the expansion rod (5) are movably connected to the support rod (2) and the sliding assembly (4), respectively. The expansion rod (5) can drive the support rod (2) to approach the central axis (1) or move away from the central axis (1); The isolation layer (3) is arranged on the outside of all the support rods (2).

2. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: The sliding assembly (4) is divided into an upper slider (41) and a lower slider (42), wherein the upper slider (41) is connected to the upper part of the support rod via an expansion rod (5), and the lower slider (42) is connected to the lower part of the support rod via the expansion rod (5).

3. The device for controlling the expansion range of fluidized soil in karst areas according to claim 2, characterized in that: A fixed pulley (6) is provided at the lower end of the central shaft (1), and the traction device (7) can drive the upper slider (41) to move upward, and the traction device (7) can also drive the lower slider (42) to move downward through the movable pulley.

4. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: The number of the support rods (2) is 8.

5. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: The traction device (7) is at least one of a nylon rope, a steel wire rope or a steel cable.

6. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: A limiting mechanism is provided on the side wall of the support rod (2), and the limiting mechanism is capable of controlling the relative rotation of the expansion rod (5) and the support rod (2).

7. The device for controlling the expansion range of fluidized soil in karst areas according to claim 6, characterized in that: The limiting mechanism is a slot (8) provided on the side wall of the support rod (2), the slot (8) being provided with a bayonet (81) and a side groove (82), the end of the expansion rod (5) being spherical, the spherical structure of the end of the expansion rod (5) being provided in the slot (8), and the expansion rod (5) being able to achieve relative rotation with the support rod (2) through the side groove (82).

8. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: The expansion rod (5) is hingedly connected to the sliding assembly (4).

9. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: The isolation layer (3) is one of PVC, Oxford cloth and nylon cloth.

10. The device for controlling the expansion range of fluidized soil in karst areas according to claim 1, characterized in that: The support rod (2), the central axis (1) and the expansion rod (5) are all metal components.

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