Anti-flooding cage device

Abstract

The application relates to a floating cage preventing device, belonging to the technical field of pile foundation construction, which comprises an abutting piece supported on a steel reinforcement cage, the abutting piece can cover the top surface of the steel reinforcement cage and can be placed in a casing, and the abutting piece is detachably connected with a main drill rod of a rotary drilling machine. The application has the effects of reducing the occurrence of the "floating cage" phenomenon and guaranteeing the construction quality and structural safety of the pile foundation.

Description

Technical Field

[0001] This application relates to the field of pile foundation construction technology, and in particular to an anti-floating cage device. Background Technology

[0002] In the field of building foundation engineering, full-rotation rotary drilling rigs are widely used in the pile foundation construction of major projects such as bridges, high-rise buildings, and rail transit due to their high drilling efficiency and strong adaptability to geological formations. One of the core processes of this technology is as follows: after drilling and lowering the reinforcing cage, underwater concrete pouring is completed. Subsequently, the casing is rotated and lifted section by section by the power head of the rotary drilling rig to achieve the recycling and reuse of the casing.

[0003] However, this process presents significant technical challenges. The poured concrete exerts strong gripping and frictional forces on the outer wall of the casing and the perimeter of the reinforcing cage. Furthermore, as the casing's embedment depth increases, the contact area between the concrete and the casing / reinforcing cage expands, causing these forces to increase non-linearly. When the rotary drilling rig drives the casing to rotate and lift, these gripping and frictional forces simultaneously act on the reinforcing cage, causing it to float unexpectedly along with the casing, resulting in what is commonly known in the industry as a "floating cage" quality defect. A "floating cage" not only causes the reinforcing cage to deviate from its design elevation, damaging the internal load-bearing structure of the pile foundation, but also directly reduces the pile foundation's bearing capacity. In severe cases, rework of the pile foundation is necessary, increasing construction costs, delaying the project, and posing a significant threat to the structural safety of subsequent works. Utility Model Content

[0004] In order to reduce the occurrence of "floating cage" phenomenon and ensure the construction quality and structural safety of pile foundation, this application provides an anti-floating cage device.

[0005] The anti-floating cage device provided in this application adopts the following technical solution: An anti-floating cage device includes an abutment member supported on a reinforcing cage, the abutment member being able to cover the top surface of the reinforcing cage and be placed inside a protective casing, and the abutment member being detachably connected to the main drill rod of a rotary drilling rig.

[0006] By adopting the above technical solution, the abutment is placed inside the casing and stably supported on the reinforcing cage, covering the top surface of the reinforcing cage. The abutment is detachably connected to the main drill rod of the rotary drilling rig. The main drill rod of the rotary drilling rig continuously and evenly applies downward pressure to the reinforcing cage through the abutment to counteract the upward floating tendency of the concrete caused by the gripping force and friction of the casing on the reinforcing cage, thereby reducing the floating cage phenomenon and ensuring the quality of pile foundation construction. At the same time, the detachable design does not affect the subsequent construction process, and the device can be quickly separated from the main drill rod without the need for additional dismantling of complex structures, thus improving construction efficiency.

[0007] Optionally, the abutment includes a circular steel plate, the outer diameter of which is smaller than the inner diameter of the casing and larger than the inner diameter of the reinforcing cage. A sleeve is provided on the circular steel plate, and the main drill rod of the rotary drilling rig passes through the sleeve. The main drill rod of the rotary drilling rig is detachably connected to the sleeve.

[0008] By adopting the above technical solution, the outer diameter of the circular steel plate is smaller than the inner diameter of the casing, ensuring that the device can be smoothly inserted into the casing without affecting the removal of the casing. The outer diameter is larger than the inner diameter of the reinforcing cage, which can stably support the top of the reinforcing cage. The sleeve is connected to the circular steel plate, providing precise installation and positioning for the main drill rod of the rotary drilling rig. This allows the main drill rod of the rotary drilling rig to extend into the sleeve and form a connection with the circular steel plate, vertically transferring its own weight to the circular steel plate and then evenly distributing it to the top surface of the reinforcing cage. This avoids excessive local stress that could cause deformation of the reinforcing cage, thus balancing anti-buoyancy effect and component protection.

[0009] Optionally, the sleeve has at least two first connecting holes, and the main drill rod of the rotary drilling rig has at least two second connecting holes, with a pin passing through both the first connecting holes and the second connecting holes.

[0010] By adopting the above technical solution, the pin passes through the first connecting hole of the sleeve and the second connecting hole of the main drill rod, realizing a quick and detachable connection between the two. Assembly and disassembly can be completed without special tools, which is suitable for the high-efficiency operation requirements of the construction site.

[0011] Optionally, the diameters of the first connecting hole and the second connecting hole are adapted to the diameter of the pin, forming a clearance fit.

[0012] By adopting the above technical solution, the first connecting hole and the second connecting hole are adapted to the pin hole diameter and have a clearance fit, which not only facilitates the insertion and installation of the pin, but also ensures that the pin does not loosen after installation, thus guaranteeing installation stability.

[0013] Optionally, the circular steel plate is concentric with the sleeve.

[0014] By adopting the above technical solution, the sleeve and the circular steel plate are arranged concentrically, so that the point of gravity of the main drill rod coincides with the center of force of the circular steel plate, and the pressure is evenly distributed on the top surface of the steel cage. This avoids local overload deformation of the steel cage due to force offset, while ensuring that the downward pressure acts vertically and improving the reliability of anti-buoyancy.

[0015] Optionally, the end of the first connecting hole away from the main drill rod of the rotary drilling rig and the insertion end of the pin are both beveled.

[0016] By adopting the above technical solution, chamfering is applied to both locations to guide the insertion of the pin, making it easier for the pin to be quickly aligned with the hole and inserted, reducing the alignment time during installation and further improving construction efficiency.

[0017] Optionally, a protective sleeve is connected below the circular steel plate, and the diameter of the protective sleeve is smaller than the inner diameter of the reinforcing cage.

[0018] By adopting the above technical solution, the sheath can be inserted into the reinforcing cage to provide lateral support for the main reinforcing bars of the cage, preventing the main reinforcing bars of the cage from bending and deforming under the bidirectional force of the rotary drilling rig's main drill rod and the casing, thus protecting the reinforcing cage. At the same time, the lateral support of the reinforcing cage can also prevent the reinforcing cage from shifting and ensure the stability of the support.

[0019] Optionally, the circular steel plate and the sleeve are fully welded together.

[0020] By adopting the above technical solution, the sleeve and the circular steel plate are fully welded, which greatly improves the connection strength and rigidity of the two, and can stably withstand the self-weight pressure of the main drill rod of the rotary drilling rig, avoiding loosening and breakage of the connection due to long-term stress or vibration.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. A circular steel plate covers the top of the reinforcing cage and supports it inside the casing. It is detachably connected to the main drill rod of the rotary drilling rig. The main drill rod's own weight continuously and evenly applies downward pressure to the reinforcing cage, effectively counteracting the upward floating tendency generated during concrete pouring, reducing the "floating cage" phenomenon, and ensuring the quality of pile foundation construction. Moreover, the detachable design does not affect subsequent construction and allows for quick separation of the device from the main drill rod, improving construction efficiency. 2. The device can be quickly connected to the main drill rod by means of a pin and the first and second connecting holes. The clearance fit between the holes and the pin and the chamfer treatment simplify the alignment and insertion process. Assembly and disassembly can be completed without special tools, which greatly improves the work efficiency. 3. The sleeve and the circular steel plate are arranged concentrically to distribute the weight evenly and avoid local overload deformation of the reinforcing cage; the sleeve is inserted into the reinforcing cage to provide lateral support and prevent the main reinforcing bars of the reinforcing cage from bending or shifting. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application.

[0023] Figure 2 This is a schematic diagram of the structure of the second connecting hole in Embodiment 1 of this application.

[0024] Figure 3 This is a schematic diagram of the overall structure of Embodiment 2 of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Abutment part; 11. Circular steel plate; 2. Sleeve; 21. First connecting hole; 3. Second connecting hole; 4. Pin; 5. Protective sleeve. Detailed Implementation

[0026] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0027] This application discloses an anti-floating cage device. Example

[0028] like Figure 1 and Figure 2 An anti-floating cage device includes an abutment 1, which is placed inside the protective casing and can be stably erected on the reinforcing cage. The abutment 1 includes a circular steel plate 11, the outer diameter of which is smaller than the inner diameter of the protective casing and larger than the inner diameter of the reinforcing cage, so as to ensure that the device can be smoothly inserted into the internal space of the protective casing, while stably supporting the top surface of the reinforcing cage and covering the reinforcing cage.

[0029] A sleeve 2 is vertically welded to the center of the circular steel plate 11. The sleeve 2 and the circular steel plate 11 are concentrically positioned so that the gravity transmission axis coincides with the center of the reinforcing cage. The main drill rod of the rotary drilling rig can be inserted downward into the sleeve 2 to achieve coaxial positioning of the two.

[0030] Two first connecting holes 21 are symmetrically opened on the side wall of the sleeve 2. The two first connecting holes 21 correspond one-to-one with the second connecting holes 3 set on the main drill rod of the rotary drilling rig. The diameters of the first connecting holes 21 and the second connecting holes 3 are equal. The pin 4 passes through both the first connecting holes 21 and the second connecting holes 3. The diameters of the first connecting holes 21 and the second connecting holes 3 are clearance fit with the diameter of the pin 4. The outer edge of the opening of the first connecting hole 21 and the insertion end of the pin 4 are beveled. During installation, simply insert the main drill rod into the sleeve 2 and rotate the sleeve 2 to align the first connecting holes 21 and the second connecting holes 3. Then, smoothly push the pin 4 into the through hole along the beveled surface to achieve a quick and stable connection. During disassembly, simply pull out the pin 4 in the reverse direction to separate the device. The disassembly and assembly are quick and convenient, and the connection is stable.

[0031] During the manufacturing of the device, the joint surface of the sleeve 2 and the circular steel plate 11 is fully welded to form a continuous and closed annular weld, which can ensure that the connection area has sufficient compressive strength and fatigue resistance. When repeatedly subjected to the self-weight of the rotary drilling rig's main drill rod and construction vibration load, weld cracking or structural deformation is avoided. The overall structure formed by full welding makes the sleeve 2 and the steel plate assembly a rigid load-bearing whole, ensuring the reliability of the pressure transmission path.

[0032] The implementation principle of this application embodiment is as follows: During installation, the sleeve 2 is fitted onto the main drill rod of the rotary drilling rig, and the pin 4 is passed through the first connecting hole 21 and the second connecting hole 3, connecting the sleeve 2 to the main drill rod of the rotary drilling rig. Since the circular steel plate 11 and the sleeve 2 are welded together as a whole, the circular steel plate 11 is also connected to the main drill rod of the rotary drilling rig. The circular steel plate 11 is placed inside the casing to stably support it on the reinforcing cage. After the concrete is poured, the installed controller is lowered to the top elevation of the reinforcing cage through the main drill rod of the rotary drilling rig. The weight of the main drill rod of the rotary drilling rig is used to press down the reinforcing cage, while driving the power head of the rotary drilling rig to rotate and lift the casing, thus removing the casing. After the construction is completed, the sleeve 2 and the main drill rod of the rotary drilling rig are removed from the reinforcing cage together, and the two can be separated after the pin 4 is pulled out.

[0033] By setting a circular steel plate 11 with an outer diameter adapted to the casing and the reinforcing cage, it can be stably erected on the top surface of the reinforcing cage and cover the reinforcing cage without affecting the removal of the casing. The self-weight of the rotary drilling rig's main drill rod is used to apply a vertical downward force to the reinforcing cage, thereby suppressing the upward floating tendency of the reinforcing cage caused by the concrete gripping force and friction during the removal of the casing.

[0034] The sleeve 2 is concentrically positioned with the main drill rod of the rotary drilling rig to ensure that the pressure transmission axis coincides with the center of the reinforcing cage, thus avoiding the offset of the reinforcing cage caused by eccentric force. The pin 4 achieves a quick and stable connection between the sleeve 2 and the main drill rod through clearance fit and chamfer design, ensuring the reliability of the pressure transmission path. The full welding process of the sleeve 2 and the circular steel plate 11 forms a rigid load-bearing whole, ensuring that the structure does not crack or deform when bearing the self-weight of the main drill rod and construction vibration load, thereby stably transmitting the pressure and achieving the anti-floating cage effect. Example

[0035] Reference Figure 3 The difference between this embodiment and embodiment 1 is that a cylindrical sheath 5 is coaxially welded to the bottom of the circular steel plate 11. The outer diameter of the sheath 5 is smaller than the inner diameter enclosed by the main reinforcement bars of the steel cage. During installation, it can be inserted into the inner side of the top of the steel cage to form lateral support for the inner ring of the main reinforcement bars. When the rotary drilling rig applies vertical downward pressure through the main drill rod, the sheath 5 effectively suppresses the lateral deformation tendency of the main reinforcement bars of the steel cage, avoids the main reinforcement bars of the steel cage from bending under the combined action of the pressure of the circular steel plate 11 and the concrete bond force, and enhances the structural stability.

[0036] The implementation principle of Example 2 is as follows: By adding a coaxial cylindrical sleeve 5 to the bottom of the circular steel plate 11 and inserting the sleeve 5 into the inner side of the top of the reinforcing cage, while the circular steel plate 11 applies vertical downward pressure to the reinforcing cage to suppress floating, the sleeve 5 forms lateral support for the inner ring of the main reinforcing bars of the reinforcing cage. The sleeve 5 can effectively resist the lateral deformation tendency of the main reinforcing bars and avoid bending deformation of the main reinforcing bars under the bidirectional force of the circular steel plate 11 and the concrete, further enhancing the structural stability of the reinforcing cage under pressure. Thus, while ensuring the vertical pressure anti-floating effect, the reliability of the overall anti-floating cage device is improved by suppressing lateral deformation.

[0037] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A device for preventing floating cages, characterized in that: The device includes an abutment (1) which is supported on a reinforcing cage. The abutment (1) can cover the top surface of the reinforcing cage and can be placed inside a casing. The abutment (1) is detachably connected to the main drill rod of the rotary drilling rig. The abutment (1) includes a circular steel plate (11). The outer diameter of the circular steel plate (11) is smaller than the inner diameter of the casing and larger than the inner diameter of the reinforcing cage. A sleeve (2) is provided on the circular steel plate (11). The main drill rod of the rotary drilling rig passes through the sleeve (2). The main drill rod of the rotary drilling rig is detachably connected to the sleeve (2).

2. The anti-floating cage device according to claim 1, characterized in that: The sleeve (2) has at least two first connecting holes (21), and the main drill rod of the rotary drilling rig has at least two second connecting holes (3). The first connecting holes (21) and the second connecting holes (3) are connected together by a pin (4).

3. The anti-floating cage device according to claim 2, characterized in that: The diameters of the first connecting hole (21) and the second connecting hole (3) are adapted to the diameter of the pin (4) and are in clearance fit.

4. The anti-floating cage device according to claim 1, characterized in that: The circular steel plate (11) is concentric with the sleeve (2).

5. The anti-floating cage device according to claim 2, characterized in that: The end of the first connecting hole (21) away from the main drill rod of the rotary drilling machine and the insertion end of the pin (4) are both beveled.

6. The anti-floating cage device according to claim 1, characterized in that: A sheath (5) is connected below the circular steel plate (11), and the diameter of the sheath (5) is smaller than the inner diameter of the reinforcing cage.

7. The anti-floating cage device according to claim 1, characterized in that: The circular steel plate (11) and the sleeve (2) are fully welded together.

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