A pile hole forming device for medium sand layer carrier pile

Abstract

The utility model discloses a kind of pile hole forming devices for medium sand layer carrier pile, by casing, lifting device and pressure applying device constitute, multiple casings are connected by head and tail to constitute pile hole wall body, after concrete pouring is completed, lifting device driven by hydraulic pressure removes casing vertically, in the process of pulling out casing, by hydraulic actuator installed in the top of casing, controllable pressure is continuously applied to the concrete in the cylinder, offset the negative pressure in the cylinder generated by casing rising, prevent quality defects such as necking, fracture of concrete pile body, by mechanical linkage and pressure control, realized the unity guarantee of casing safe removal and pile body forming quality in medium sand layer prone to hole collapse, significantly improve the pile-forming qualification rate and bearing reliability of carrier pile, applicable to pile foundation construction in medium sand layer flow plastic stratum.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction equipment, specifically to a pile hole forming device for medium sand layer carrier piles. Background Technology

[0002] The pile hole forming device for medium sand layer carrier piles is a construction equipment designed to address geological conditions such as easy-to-collapse holes and quicksand in medium sand layers. Traditional drilling devices struggle to form stable hole walls in medium sand layers, affecting the quality and safety of subsequent pile construction. This device vibrates and presses or drives a steel casing into the stratum, forming a protected and stable cavity inside the casing. This provides the necessary conditions for subsequent pile hammer tamping and filling to form a high-bearing-capacity carrier, ensuring the application of carrier pile technology under adverse geological conditions.

[0003] After the existing pile body concrete is poured, the casing needs to be removed by vibration. When constructing in medium sand strata with strong fluidity, if the rate of casing removal is not well controlled, negative pressure is easily generated at the bottom of the casing, causing the concrete inside the casing to surge upward, resulting in local necking of the formed pile body, or even fracture, which damages the structural integrity and uniformity of the pile body. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of the aforementioned technologies by proposing a pile hole forming device for medium sand layer carrier piles, thereby solving the aforementioned technical problems.

[0005] This utility model provides a pile hole forming device for medium sand layer carrier piles, including a plurality of casings located on the ground, the casings being connected end to end in sequence, and further including: The lifting device has one end in contact with the ground and the output end connected to the protective cylinder. The lifting device drives the protective cylinder to move vertically and out of the ground. The pressure applying device is located at the top of the casing. The output end of the pressure applying device comes into contact with the concrete material inside the casing, and the pressure applying device drives its output end to continuously apply pressure to the concrete material inside the casing.

[0006] Preferably, the lifting device includes four support arms, one of which has a first support rod hinged to its surface, a hydraulic rod hinged to its other end, a second support rod hinged to its other end, a connecting arm slidably mounted on its surface, the other end of the second support rod hinged to the connecting arm, and the connecting arm hinged to the side wall of the casing.

[0007] Preferably, the other end of the hydraulic rod is hinged to a support base, which abuts against the side wall of the casing and the ground.

[0008] Preferably, the connecting arms on the four support arms are all connected to the outer wall of the casing, and the four support arms are evenly distributed in an array along the outer wall of the casing.

[0009] Preferably, the pressure device includes a pressure platform, which is detachably connected to the protective cylinder by bolts. A circular groove is provided on the bottom surface of the pressure platform, and a pressure plate is slidably installed in the circular groove. A hydraulic cylinder is fixedly installed on the upper surface of the pressure platform, and a telescopic arm is connected to the output end of the hydraulic cylinder. The telescopic arm passes through the surface of the pressure platform and is fixedly connected to the pressure plate.

[0010] Preferably, the pressure plate is circular in shape and its diameter is smaller than the diameter of the inner wall of the casing.

[0011] Preferably, a displacement sensor is installed on the connecting arm, and a pressure sensor is installed on the pressure plate. The displacement sensor and the pressure sensor are electrically connected. The pressure sensor continuously adjusts the pressure intensity according to the change in the height of the casing so that the pressure on the concrete inside the casing remains constant during the lifting process of the casing.

[0012] Preferably, several protective sleeves are detachably connected to each other by snap-fit.

[0013] Preferably, the casing is made of steel.

[0014] Compared with existing technologies, it has the following beneficial effects: This utility model provides a pile hole forming device for medium sand layer carrier piles. The device uses a lifting device to drive the casing to move, making it easy to pull out the casing buried underground. At the same time, a pressure device is set on the top of the casing. By driving the output end of the pressure device to apply pressure to the concrete inside the casing, the problem of concrete pile necking or fracture caused by negative pressure inside the casing during the casing lifting process is solved. Through the cooperation of the lifting device and the pressure device, the device can completely remove the casing in medium sand layer strata that are prone to hole collapse, while ensuring that the pile body concrete is full, dense, and has reliable bearing capacity. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only preferred embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a pile hole forming device for medium sand layer carrier piles according to the present invention. Figure 2This is a schematic diagram of the structure of a pile hole forming device for medium sand layer carrier piles, which is located on the ground. Figure 3 This is a schematic diagram of the lifting device structure of a pile hole forming device for medium sand layer carrier piles according to the present invention. Figure 4 This is a schematic diagram of the pressure application device structure of a pile hole forming device for medium sand layer carrier piles according to the present invention; Figure 5 This is a schematic diagram showing the relationship between the pressure plate and the circular groove structure in the pressure application device of a pile hole forming device for medium sand layer carrier piles according to this utility model.

[0017] In the diagram, 1. Casing; 2. Support arm; 3. First support rod; 4. Hydraulic rod; 5. Second support rod; 6. Connecting arm; 7. Support base; 8. Pressure platform; 9. Bolt; 10. Circular groove; 11. Pressure plate; 12. Hydraulic cylinder; 13. Telescopic arm; 14. Displacement sensor; 15. Pressure sensor. Detailed Implementation

[0018] This section will describe in detail the specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0019] Example 1: like Figures 1 to 5 As shown, this utility model provides a pile hole forming device for medium sand layer carrier piles, including a plurality of casings 1 located on the ground, the casings 1 being connected end to end in sequence, and further including: The lifting device has one end in contact with the ground and the output end of the lifting device connected to the protective cylinder 1. The lifting device drives the protective cylinder 1 to move vertically and out of the ground. A pressure-applying device is installed at the top of the casing 1. The output end of the pressure-applying device is in contact with the concrete material inside the casing 1. The pressure-applying device drives its output end to continuously apply pressure to the concrete material inside the casing 1.

[0020] During use, the lifting device is activated to move the casing 1 upwards, smoothly and vertically pulling the casing 1 out of the ground. During the pulling process, the pressure device set on the top of the casing 1 is activated simultaneously. Its output end will continuously push down and compress the concrete inside the casing 1. By actively applying a stable downward pressure, the negative pressure inside the casing caused by the rise of the casing 1 is offset, thereby ensuring that the concrete can always densely fill the hole left after the casing 1 is pulled out, effectively preventing quality problems such as necking or breakage of the pile, and ensuring the quality of the pile.

[0021] Example 2: like Figures 1 to 5 As shown, in conjunction with the technical solution of Embodiment 1, in this technical solution, the lifting device includes four support arms 2. A first support rod 3 is hinged to the surface of one of the support arms 2, and a hydraulic rod 4 is hinged to the other end of the first support rod 3. A second support rod 5 is hinged to one end of the hydraulic rod 4. A connecting arm 6 is slidably mounted on the surface of the support arm 2. The other end of the second support rod 5 is hinged to the connecting arm 6. The connecting arm 6 is hinged to the side wall of the casing 1. When the hydraulic rod 4 is activated, it pushes the first support rod 3 and the second support rod 5 connected to it to move. The first support rod 3 transmits the thrust received to the ground through the support arm 2, forming a stable support. The second support rod 5 transmits the thrust received to the connecting arm 6, driving the connecting arm 6 to move along the surface of the support arm 2, which is converted into an upward linear movement of the connecting arm 6, thereby smoothly and vertically pulling the casing 1 out of the ground.

[0022] Furthermore, a support base 7 is hinged to the other end of the hydraulic rod 4. The support base 7 abuts against the side wall of the casing 1 and the ground. Before lifting the casing 1, the lower end of the support base 7 is firmly placed against the ground, while its side is pressed tightly against the outer wall of the casing 1 to form a solid support, providing a basic force-bearing surface for the extension and retraction of the hydraulic rod 4, and providing a stable and solid force-bearing fulcrum for the lifting process.

[0023] Furthermore, the connecting arms 6 on the four support arms 2 are all connected to the outer wall of the casing 1, and the four support arms 2 are evenly distributed along the outer wall of the casing 1. When the lifting device is started, the four connecting arms 6 simultaneously and evenly apply force upward from all sides of the casing 1 to ensure that the force is evenly applied to the casing 1, thereby keeping the casing 1 vertically rising throughout the entire removal process and preventing the casing 1 from tilting or getting stuck.

[0024] Furthermore, the pressure application device includes a pressure application platform 8, which is detachably connected to the casing 1 via bolts 9. A circular groove 10 is formed on the bottom surface of the pressure application platform 8, and a pressure plate 11 is slidably installed within the circular groove 10. A hydraulic cylinder 12 is fixedly installed on the upper surface of the pressure application platform 8, and a telescopic arm 13 is connected to the output end of the hydraulic cylinder 12. The telescopic arm 13 passes through the surface of the pressure application platform 8 and is fixedly connected to the pressure plate 11. Activating the hydraulic cylinder 12 above the platform drives the telescopic arm 13 to extend downwards, thereby pushing the pressure plate 11 located in the circular groove 10 below the platform to slide downwards, firmly pressing it against the top surface of the concrete inside the casing 1. The pressure application platform 8 is securely installed on the top of the casing 1 using bolts 9, providing a base surface for the hydraulic cylinder 12 to apply force.

[0025] Furthermore, the pressure plate 11 is circular in shape, and its diameter is smaller than that of the inner wall of the casing 1. During the descent, the pressure plate 11 maintains a gap with the inner wall of the casing 1, ensuring that the pressure is applied entirely to the upper surface of the concrete and avoiding friction with the casing 1.

[0026] Furthermore, a displacement sensor 14 is installed on the connecting arm 6, and a pressure sensor 15 is installed on the pressure plate 11. The displacement sensor 14 and the pressure sensor 15 are electrically connected. The pressure sensor 15 continuously adjusts the pressure intensity according to the change in the height of the casing 1, so that the pressure on the concrete inside the casing 1 remains constant during the lifting process of the casing 1. The displacement sensor 14 on the connecting arm 6 monitors the lifting height of the casing 1 in real time, while the pressure sensor 15 on the pressure plate 11 monitors the pressure fed back to the pressure plate 11 by the concrete in real time. The two sensors are linked together, and according to the rising height of the casing 1, they command the hydraulic cylinder 12 to adjust the downward pressure, ensuring that the pressure on the concrete inside the casing 1 remains stable during the continuous pulling out of the casing 1, thus counteracting the negative pressure generated inside the casing when the casing 1 is pulled out.

[0027] Furthermore, several casing sections 1 are detachably connected to each other via snap fasteners. The next casing section 1 is aligned with the top of the casing section 1 already buried underground, and the two casing sections 1 are quickly locked together by snap fasteners to form a continuous casing wall. After the concrete pouring and removal of the casing section 1 are completed, the snap fasteners can be released to separate it.

[0028] Furthermore, the casing 1 is made of steel. Utilizing the strength of steel, the casing 1 can effectively resist soil pressure and prevent deformation when driven into the stratum. During the extraction process, the steel casing 1, relying on its good rigidity and wear resistance, can withstand the extraction resistance and maintain structural integrity, ensuring the forming quality of the concrete pile body.

[0029] The working principle of a pile hole forming device for medium sand layer carrier piles disclosed in this application is as follows: In use, multiple hydraulic rods 4 surrounding the outer wall of the casing 1 are activated. Through the coordinated action of the support arm 2 and the connecting arm 6, the casing 1 is pulled out smoothly upwards. At the same time as the casing is pulled out, the hydraulic cylinder 12 installed on the top of the casing 1 drives the pressure plate 11 to continuously press the concrete downwards. Through the linkage of displacement and pressure sensor 15, the downward pressure is automatically adjusted in real time according to the lifting height of the casing 1, thereby ensuring that the concrete is always under stable pressure throughout the entire casing extraction process, effectively filling the hole and forming a complete and dense pile body.

[0030] The above description is merely a preferred embodiment of this utility model and does not constitute any limitation on this utility model. Any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model, or modify it into equivalent embodiments, without departing from the scope of the technical solution of this utility model. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of this utility model without departing from the scope of the technical solution of this utility model shall fall within the protection scope of this technical solution.

Claims

1. A pile hole forming device for medium sand layer carrier piles, comprising a plurality of casings (1) located in the ground, wherein the plurality of casings (1) are connected end to end in sequence, characterized in that, Also includes: A lifting device, one end of which is in contact with the ground, and the output end of which is connected to the protective cylinder (1). The lifting device drives the protective cylinder (1) to move vertically and out of the ground. A pressure-applying device is provided at the top of the casing (1). The output end of the pressure-applying device is in contact with the concrete material inside the casing (1). The pressure-applying device drives its output end to continuously apply pressure to the concrete material inside the casing (1).

2. The pile hole forming device for medium sand layer carrier piles according to claim 1, characterized in that, The lifting device includes four support arms (2), one of which has a first support rod (3) hinged to its surface, and a hydraulic rod (4) hinged to its other end. A second support rod (5) is hinged to one end of the hydraulic rod (4). A connecting arm (6) is slidably mounted on the surface of the support arm (2). The other end of the second support rod (5) is hinged to the connecting arm (6). The connecting arm (6) is hinged to the side wall of the protective cylinder (1).

3. The pile hole forming device for medium sand layer carrier piles according to claim 2, characterized in that, The other end of the hydraulic rod (4) is hinged to a support base (7), which abuts against the side wall of the casing (1) and the ground.

4. The pile hole forming device for medium sand layer carrier piles according to claim 3, characterized in that, The connecting arms (6) on the four support arms (2) are all connected to the outer wall of the protective sleeve (1), and the four support arms (2) are evenly distributed in an array along the outer wall of the protective sleeve (1).

5. A pile hole forming device for medium sand layer carrier piles according to claim 2, characterized in that, The pressure-applying device includes a pressure-applying platform (8), which is detachably connected to the protective cylinder (1) by bolts (9). A circular groove (10) is provided on the bottom surface of the pressure-applying platform (8), and a pressure plate (11) is slidably installed in the circular groove (10). A hydraulic cylinder (12) is fixedly installed on the upper surface of the pressure-applying platform (8), and a telescopic arm (13) is connected to the output end of the hydraulic cylinder (12). The telescopic arm (13) passes through the surface of the pressure-applying platform (8) and is fixedly connected to the pressure plate (11).

6. A pile hole forming device for medium sand layer carrier piles according to claim 5, characterized in that, The pressure plate (11) is circular in shape and its diameter is smaller than the diameter of the inner wall of the protective sleeve (1).

7. A pile hole forming device for medium sand layer carrier piles according to claim 5, characterized in that, A displacement sensor (14) is installed on the connecting arm (6), and a pressure sensor (15) is installed on the pressure plate (11). The displacement sensor (14) and the pressure sensor (15) are electrically connected. The pressure sensor (15) continuously adjusts the pressure intensity according to the change in the height of the casing (1) so that the pressure on the concrete inside the casing (1) remains constant during the lifting process of the casing (1).

8. The pile hole forming device for medium sand layer carrier piles according to claim 1, characterized in that, Several of the aforementioned protective sleeves (1) are detachably connected to each other by snap fasteners.

9. A pile hole forming device for medium sand layer carrier piles according to claim 1, characterized in that, The casing (1) is made of steel.

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