A cast-in-place pile steel casing lifting device

Abstract

The utility model discloses a cast-in-place bored pile steel casing hoisting device, including steel casing, the upper surface of steel casing is attached with annular seat support, the lower end outside surface of annular seat is fixedly connected with fixed base, the surface of annular seat is provided with sliding mouth, the inboard surface slidingly connected with trapezoidal extruding block at the sliding mouth of annular seat, the inboard surface of trapezoidal extruding block extrusion fixed in steel casing, the upper surface of annular seat is fixedly connected with support seat, the inboard surface of support seat is slidingly connected with positioning pin, and the positioning pin is fixed on the outer surface of trapezoidal extruding block, and the inboard surface of steel casing is slidingly attached with the blowing pipe cylinder, and the blowing pipe is driven into the surrounding of steel casing, and the blowing pipe is blown through the connection with air pump, can blow into the air between steel casing and the hole mud wall, forms the clearance, reduces adsorption, and the steel casing is conveniently lifted and taken out, and the integrated control type's multi -point inner and outer clamping subassembly is established, and it is convenient for the stable clamping steel casing and is lifted.

Description

Technical Field

[0001] This utility model relates to the field of lifting devices for steel casings of bored piles, and more specifically, to a lifting device for steel casings of bored piles. Background Technology

[0002] Drilled cast-in-place piles are constructed by creating a hole in the foundation soil using mechanical drilling, steel pipe extrusion, or manual excavation. A reinforcing cage is then placed inside the hole, and concrete is poured in. During drilling, a steel casing is inserted into the borehole to prevent sidewall collapse. The casing wall thickness is typically 4 to 10 mm, and the length is 2 to 3 meters. Drilling depths can reach approximately 20 meters, leading to situations where multiple steel casings are welded together and inserted into the borehole. This presents a challenge in removing the casing after drilling is complete. In some cases, the casing located at the bottom of the borehole may break. This not only increases construction costs due to the inability to effectively recover the casing but also potentially affects the strength and lifespan of the poured concrete.

[0003] In existing technologies, such as the present invention with application publication number CN119287896A, which belongs to the field of bored piles, a device and method for lifting steel casings for bored piles is disclosed. This device reduces the difficulty of removing the steel casing and provides protection for it. The steel casing lifting device includes a lifting unit and a vibration unit. The lifting unit is configured to lift the steel casing, and the vibration unit is configured to send high-frequency vibration waves to the steel casing. The method for lifting the steel casing includes: fixing the upper end of the steel casing to the lifting unit; the lifting unit applying an upward lifting force to the steel casing; the lifting force gradually increasing; and when the lifting force is equal to the weight of the steel casing, applying high-frequency vibration to the steel casing located above the ground, causing the entire steel casing to vibrate at high frequency. The lifting force is then gradually increased, causing the steel casing to be lifted upwards.

[0004] When the steel casing is lifted, the steel casing and the mud wall inside the hole adhere to each other, generating suction, which makes it difficult to remove smoothly. The above-mentioned patent uses high-frequency vibration, but its high-frequency vibration components are complex and costly, and the vibration is easy to damage the weld. Furthermore, when the steel casing is squeezed and lifted, a clamping component is used, which squeezes and clamps the steel casing from the outside to the inside, which makes it easy for the steel casing to deform and slip. Utility Model Content

[0005] To address the problems existing in the prior art, the purpose of this utility model is to provide a steel casing lifting device for bored piles. An air blowing pipe is driven into the perimeter of the steel casing. By connecting the air blowing pipe to an air pump, air can be blown into the space between the steel casing and the mud wall inside the hole, creating a gap, reducing the suction force, and facilitating the lifting and removal of the steel casing. Furthermore, an integrated controllable multi-point inner and outer clamping assembly is provided to facilitate stable clamping of the steel casing for lifting.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A steel casing lifting device for bored piles includes a steel casing. An annular seat is fitted and supported on the upper surface of the steel casing. A fixing seat is fixedly connected to the lower outer surface of the annular seat. A sliding opening is provided on the surface of the annular seat. A trapezoidal extrusion block is slidably connected to the inner surface of the sliding opening of the annular seat. The outer surface of the trapezoidal extrusion block is pressed and fixed to the inner surface of the steel casing. A support seat is fixedly connected to the upper surface of the annular seat. A positioning pin is slidably connected to the inner surface of the support seat. The positioning pin is fixed to the outer surface of the trapezoidal extrusion block. A variable-diameter extrusion cylinder is slidably connected to the inner surface of the seat, and a hydraulic cylinder is fixedly connected to the outer end surface of the annular seat. The hydraulic rod end face of the hydraulic cylinder is fixedly connected to the upper inner surface of the variable-diameter extrusion cylinder. An air blowing pipe is slidably attached to the outer surface of the steel casing. An air blowing pipe is driven into the steel casing. By blowing air through the air blowing pipe connected to an air pump, air can be blown between the steel casing and the mud wall inside the hole to form a gap, reduce the suction force, and facilitate the lifting and removal of the steel casing. An integrated controllable multi-point inner and outer clamping assembly is set to facilitate stable clamping of the steel casing for lifting.

[0008] Furthermore, the outer surface of the variable diameter extrusion cylinder is pressed against the inner surface of the trapezoidal extrusion block, the outer surface of the trapezoidal extrusion block is pressed against the inner surface of the steel casing, and the outer surface of the steel casing is pressed against the inner surface of the fixed base.

[0009] Furthermore, a lifting ring is fixedly connected to the upper surface of the variable diameter extrusion cylinder, and the lifting ring is fixedly connected to the upper surfaces of both sides of the variable diameter extrusion cylinder.

[0010] Furthermore, the outer surface of the air blowing tube is uniformly provided with small air guiding holes.

[0011] Furthermore, an air guide hose is fixedly connected to the upper surface of the air blowing tube.

[0012] Furthermore, a positioning protrusion is fixedly connected to the upper outer surface of the air blowing tube.

[0013] Furthermore, the trapezoidal extrusion blocks and fixing seats are distributed in six groups on the surface of the annular seat.

[0014] Compared with existing technologies, the advantages of this utility model are:

[0015] (1) An air blowing pipe is driven around the steel casing. By blowing air through the air blowing pipe connected to the air pump, air can be blown between the steel casing and the mud wall inside the hole to form a gap, reduce the adsorption force, and facilitate the lifting and removal of the steel casing. In addition, an integrated control multi-point inner and outer clamping component is set up to facilitate the stable clamping of the steel casing for lifting. Attached Figure Description

[0016] Figure 1 This is a first schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a second schematic diagram of the overall structure of this utility model;

[0018] Figure 3 This is a third schematic diagram of the overall structure of this utility model;

[0019] Figure 4 This is a cross-sectional schematic diagram showing the distribution relationship between the annular seat and the steel casing of this utility model;

[0020] Figure 5 This is a partial structural diagram of the air blowing tube of this utility model.

[0021] Explanation of the labels in the diagram:

[0022] 1. Steel casing, 2. Ring seat, 20. Fixed seat, 3. Sliding port, 4. Trapezoidal extrusion block, 5. Support seat, 6. Positioning pin, 7. Variable diameter extrusion cylinder, 8. Hydraulic cylinder, 9. Lifting ring, 10. Air blowing pipe, 11. Air guide hole, 12. Air guide hose, 13. Positioning protrusion. Detailed Implementation

[0023] 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.

[0024] Example 1

[0025] Please see Figure 1-5A steel casing lifting device for bored piles includes a steel casing 1. An annular seat 2 is fitted and supported on the upper surface of the steel casing 1. A fixing seat 20 is fixedly connected to the outer surface of the lower end of the annular seat 2. A sliding opening 3 is provided on the surface of the annular seat 2. A trapezoidal extrusion block 4 is slidably connected to the inner surface of the sliding opening 3 of the annular seat 2. The outer surface of the trapezoidal extrusion block 4 is pressed and fixed to the inner surface of the steel casing 1. A support seat 5 is fixedly connected to the upper surface of the annular seat 2. A positioning pin 6 is slidably connected to the inner surface of the support seat 5. The positioning pin 6 is fixed to the outer surface of the trapezoidal extrusion block 4 (the positioning pin 6 is used to adjust the position of the trapezoidal extrusion block 4 when it slides). (It can be slidably positioned and supported). The inner surface of the annular seat 2 is slidably connected to the variable diameter extrusion cylinder 7, and the outer end surface of the annular seat 2 is fixedly connected to the hydraulic cylinder 8. The hydraulic rod end face of the hydraulic cylinder 8 is fixedly connected to the upper inner surface of the variable diameter extrusion cylinder 7. The outer surface of the steel casing 1 is slidably attached to the air blowing pipe 10. An air blowing pipe is driven into the steel casing. By blowing air through the air blowing pipe connected to the air pump, air can be blown into the space between the steel casing and the mud wall inside the hole to form a gap, reduce the suction force, and facilitate the lifting and removal of the steel casing. In addition, an integrated control multi-point inner and outer clamping assembly is set to facilitate the stable clamping of the steel casing for lifting.

[0026] The outer surface of the variable diameter extrusion cylinder 7 is pressed against the inner surface of the trapezoidal extrusion block 4, the outer surface of the trapezoidal extrusion block 4 is pressed against the inner surface of the steel protective cylinder 1, and the outer surface of the steel protective cylinder 1 is pressed against the inner surface of the fixed seat 20. During extrusion, it can be supported from the inside and outside. The outer side of the steel protective cylinder 1 is supported by the inner end of the fixed seat 20. During extrusion, after the trapezoidal extrusion block 4 slides, it can be pressed outward against the inner wall of the steel protective cylinder 1. Its outer side is supported by the fixed seat 20, which will not cause the steel protective cylinder 1 to deform. It can be clamped more tightly without deformation, which is convenient to use and has a firm clamping.

[0027] A lifting ring 9 is fixedly connected to the upper surface of the variable diameter extrusion cylinder 7. The lifting ring 9 is fixedly connected to the upper surfaces of both sides of the variable diameter extrusion cylinder 7. In use, it is lifted by hanging it on the lifting ring 9 through the hoisting mechanism. Since the variable diameter extrusion cylinder 7 adopts a variable diameter structure, when it is squeezed upward from the variable diameter extrusion cylinder 7, it can drive the trapezoidal extrusion block 4 to slide outward, which can tightly clamp and fix the steel protective cylinder 1, and the clamping is firm.

[0028] A positioning protrusion 13 is fixedly connected to the upper outer surface of the air blowing tube 10; the positioning protrusion 13 prevents the air blowing tube 10 from sliding down excessively and can be used for blocking and positioning.

[0029] Six sets of trapezoidal extrusion blocks 4 and fixed seats 20 are distributed on the surface of the annular seat 2; the six sets of trapezoidal extrusion blocks 4 and fixed seats 20 can be extruded and lifted at six points, with a large extrusion support area and more secure extrusion.

[0030] In use, a fixed seat 20 is fixedly connected to the lower outer surface of the annular seat 2. A sliding opening 3 is provided on the surface of the annular seat 2. A trapezoidal extrusion block 4 is slidably connected to the inner surface of the sliding opening 3 of the annular seat 2. The outer surface of the trapezoidal extrusion block 4 is pressed and fixed to the inner surface of the steel casing 1. A variable-diameter extrusion cylinder 7 is slidably connected to the inner surface of the annular seat 2. A hydraulic cylinder 8 is fixedly connected to the outer surface of the annular seat 2. The hydraulic rod end face of the hydraulic cylinder 8 is fixedly connected to the upper inner surface of the variable-diameter extrusion cylinder 7. The hydraulic cylinder 8 presses the variable-diameter extrusion cylinder 7 upwards, which can drive the variable-diameter extrusion cylinder 7 to slide upwards, and can press the trapezoidal extrusion block 4 on the side to slide outwards. During extrusion, it can provide support from both inside and outside. The outer side of the steel casing 1 is supported by the inner end of the fixed seat 20. When pressed, the trapezoidal extrusion block 4 slides outward and presses against the inner wall of the steel casing 1. The casing 1 is supported by the fixed seat 20, preventing deformation. This allows for a tighter clamping without deformation, making it convenient and secure. The outer surface of the air blowing pipe 10 is evenly distributed with small air guide holes 11. During air blowing, gas can be discharged from multiple points, and air can be injected into the gap between the air blowing pipe 10 and the pile hole, avoiding suction and facilitating the upward lifting of the steel casing 1 while reducing frictional resistance. A flexible air guide hose 12 is fixedly connected to the upper surface of the air blowing pipe 10. In use, the flexible air guide hose 12 is connected to an air pump, which introduces air at high pressure. The air pump is existing technology and is not shown in the figure. Lifting is convenient, and the clamping is secure.

[0031] The above description is merely a preferred embodiment of this utility model; however, the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be included within the protection scope of this utility model.

Claims

1. A steel casing lifting device for bored piles, comprising a steel casing (1), characterized in that: The upper surface of the steel casing (1) is fitted with and supported by an annular seat (2). A fixing seat (20) is fixedly connected to the lower outer surface of the annular seat (2). A sliding opening (3) is provided on the surface of the annular seat (2). A trapezoidal extrusion block (4) is slidably connected to the inner surface of the sliding opening (3) of the annular seat (2). The outer surface of the trapezoidal extrusion block (4) is extruded and fixed to the inner surface of the steel casing (1). A support seat (5) is fixedly connected to the upper surface of the annular seat (2). A positioning pin (6) is slidably connected to the inner surface of the support base (5). The positioning pin (6) is fixed to the outer surface of the trapezoidal extrusion block (4). A variable diameter extrusion cylinder (7) is slidably connected to the inner surface of the annular seat (2). A hydraulic cylinder (8) is fixedly connected to the outer end surface of the annular seat (2). The hydraulic rod end face of the hydraulic cylinder (8) is fixedly connected to the upper inner surface of the variable diameter extrusion cylinder (7). An air blowing tube (10) is slidably attached to the outer surface of the steel protective cylinder (1).

2. The drilling pile steel casing lifting device according to claim 1, characterized in that: The outer surface of the variable diameter extrusion cylinder (7) is pressed against the inner surface of the trapezoidal extrusion block (4), the outer surface of the trapezoidal extrusion block (4) is pressed against the inner surface of the steel casing (1), and the outer surface of the steel casing (1) is pressed against the inner surface of the fixed seat (20).

3. The drilling pile steel casing lifting device according to claim 1, characterized in that: The upper surface of the variable diameter extrusion cylinder (7) is fixedly connected with a lifting ring (9), which is fixedly connected to the upper surfaces of both sides of the variable diameter extrusion cylinder (7).

4. The drilling pile steel casing lifting device according to claim 1, characterized in that: The outer surface of the air blowing tube (10) is uniformly provided with small air guiding holes (11).

5. The drilling pile steel casing lifting device according to claim 1, characterized in that: An air guide hose (12) is fixedly connected to the upper surface of the air blowing tube (10).

6. The drilling pile steel casing lifting device according to claim 1, characterized in that: A positioning protrusion (13) is fixedly connected to the upper outer surface of the air blowing tube (10).

7. The drilling pile steel casing lifting device according to claim 1, characterized in that: The trapezoidal extrusion block (4) and the fixed seat (20) are arranged in six groups on the surface of the annular seat (2).

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