Cast-in-place pile foundation reinforcement cage segmented connecting structure and connecting method

Abstract

The invention discloses a cast-in-place pile foundation reinforcement cage subsection connecting structure and method, the structure comprises an upper section reinforcement cage and a lower section reinforcement cage, the upper section reinforcement cage comprises upper section main reinforcements and upper section stirrups, and the lower section reinforcement cage comprises lower section main reinforcements and lower section stirrups; and the upper-section main reinforcement and the lower-section main reinforcement are lapped and fixed through the steel wire rope clamp. The connecting method comprises the following steps: 1) preparing tools and materials; 2) positioning and adjusting; (3) overlapping and fixing; and 4) completing connection. Compared with the prior art, the method has the advantages that the construction difficulty and the time cost are reduced; the overall construction quality is improved; a steel bar straight thread rolling machine, a sleeve, an electric welding machine, a welding rod and other material equipment do not need to be purchased, and cost investment is saved; pollution of a large amount of harmful gas and noise generated in the welding process to the environment is avoided; and injuries of machinery (such as mechanical injury of a reinforcing steel bar straight thread rolling machine), electric shock, occupational diseases (such as pneumoconiosis of welders and electric welding radiation) and the like in the operation process of workers are avoided.

Description

Technical Field

[0001] This invention relates to the field of cast-in-place pile foundation technology, specifically to a segmented connection structure and connection method for a cast-in-place pile foundation reinforcement cage. Background Technology

[0002] During the construction of cast-in-place pile foundations, when the pile depth is too long, the reinforcing cage often needs to be extended in sections. This process involves the connection between the upper and lower sections of the reinforcing cage. There are two main traditional connection methods: rebar threaded sleeve connection and welding.

[0003] Rebar straight thread sleeve connection is a commonly used connection method. However, in practice, because the second section of the rebar cage is suspended, it is prone to twisting and swaying, making it difficult to connect the upper and lower main bars. Furthermore, due to crane lifting angle issues, deformation during lifting, or prolonged storage of the rebar cage, the axes of the upper and lower main bars may not be aligned, leading to problems such as misalignment, excessive exposed threads at the joint, or incomplete threading during sleeve connection. This not only affects the quality of the connection but also creates difficulties for on-site supervision and quality management.

[0004] Another traditional method is welding. Although welding can effectively connect two sections of steel bars, the welding time is too long and the welding quality is difficult to control during the process. For example, problems such as incomplete welds, missed welds, burn-through, slag inclusions after welding, and incomplete welds are prone to occur.

[0005] Therefore, a novel segmented connection structure and connection method for the reinforcing cage of cast-in-place pile foundations urgently need to be studied. Summary of the Invention

[0006] The purpose of this invention is to solve the problems mentioned in the background art and to provide a segmented connection structure and connection method for the reinforcing cage of a cast-in-place pile foundation.

[0007] To solve the above-mentioned technical problems, the technical solution provided by the present invention is: a segmented connection structure for a cast-in-place pile foundation steel cage, comprising an upper steel cage and a lower steel cage, wherein the upper steel cage comprises upper main bars and upper stirrups, and the lower steel cage comprises lower main bars and lower stirrups;

[0008] The upper and lower main reinforcing bars are lapped and fixed by wire rope clamps.

[0009] As a preferred option,

[0010] The wire rope clamp includes a U-bolt, a clamp seat, and a nut;

[0011] After the U-bolt passes through the lap joint of the upper and lower main reinforcing bars, a clamp is inserted into the threaded end of the U-bolt, and a nut is screwed in. The three work together to fix the lap joint and form a stable connection structure.

[0012] As a preferred embodiment, the lap length between the upper and lower main reinforcement bars is not less than 35d.

[0013] A method for segmented connection of steel reinforcement cages in cast-in-place pile foundations, specifically including the following steps:

[0014] 1) Prepare tools and materials: Prepare the corresponding tools and materials according to the drawings and specifications, including the upper section of the reinforcing cage, the lower section of the reinforcing cage, and wire rope clamps;

[0015] 2) Positioning and adjustment: Position and adjust the reinforcing cage according to its location and elevation;

[0016] 3) Overlapping and fixing: Use wire rope clamps to overlap and fix the corresponding upper and lower main reinforcement bars;

[0017] 4) Complete the connection: Repeat the above steps to connect and fix each upper and lower main reinforcement bar to complete the connection of the entire steel cage.

[0018] As a preferred option, the lap length of the upper and lower main reinforcement bars, as well as the number and location of wire rope clamps, need to be determined or verified through mechanical tests.

[0019] As a preferred embodiment, the size and model of the wire rope clamp are determined according to the models of the upper and lower main reinforcing bars.

[0020] The advantages of this invention compared to the prior art are:

[0021] 1. Simple, straightforward, and quick installation. Installation requires no complex equipment or operating skills (only an adjustable wrench is needed), reducing construction difficulty and time costs.

[0022] 2. Visual inspection. Visual inspection of connection points enables effective control of installation quality and improves the overall construction quality.

[0023] 3. Cost savings. There is no need to purchase steel bar thread rolling machines and sleeves, welding machines and welding rods, etc., which effectively saves on cost input.

[0024] 4. Low-carbon and environmentally friendly. It avoids the pollution of the environment caused by a large amount of harmful gases and noise generated during the welding process, which is in line with the national development direction of advocating green, low-carbon, energy-saving and emission-reduction.

[0025] 5. Safe production. It avoids injuries to workers during operation, such as mechanical injuries (e.g., mechanical injuries from rebar thread rolling machines), electric shocks, and occupational diseases (e.g., welder's pneumoconiosis, welding radiation). Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention.

[0027] Figure 2 This is the present invention. Figure 1 A magnified view of part A in the image.

[0028] Figure 3 This is a schematic diagram of the wire rope clamp of the present invention.

[0029] As shown in the figure: 1. Upper section of reinforcing cage, 2. Lower section of reinforcing cage, 3. Wire rope clamp, 101. Upper section main reinforcement, 102. Upper section stirrup, 201. Lower section main reinforcement, 202. Lower section stirrup, 301. U-bolt, 302. Clamp seat, 303. Nut. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] In the description of the embodiments of the present invention, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0033] In the description of the embodiments of the present invention, "multiple" means at least two.

[0034] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0035] Referring to the accompanying drawings, a segmented connection structure for a cast-in-place pile foundation steel cage includes an upper steel cage 1 and a lower steel cage 2. The upper steel cage 1 includes upper main bars 101 and upper stirrups 102, and the lower steel cage 2 includes lower main bars 201 and lower stirrups 202.

[0036] The upper main reinforcement 101 and the lower main reinforcement 201 are lapped and fixed by wire rope clamps 3.

[0037] The wire rope clamp 3 includes a U-bolt 301, a clamp seat 302, and a nut 303;

[0038] After the U-bolt 301 passes through the lap joint of the upper main reinforcement 101 and the lower main reinforcement 201, a clamp 302 is fitted into the threaded end of the U-bolt 301, and a nut 303 is screwed in. The three work together to fix the lap joint and form a stable connection structure.

[0039] The lap length of the upper main reinforcement 101 and the lower main reinforcement 201 and the number of wire rope clamps shall be in accordance with Appendix A of "Wire Rope Clamps" (GB / T5976-2006).

[0040] A method for segmented connection of steel reinforcement cages in cast-in-place pile foundations, specifically including the following steps:

[0041] 1) Prepare tools and materials: According to the drawings and specifications, prepare the corresponding tools and materials, including the upper section of the reinforcing cage 1, the lower section of the reinforcing cage 2, and the wire rope clamp 3.

[0042] 2) Positioning and adjustment: Position and adjust the reinforcing cage according to its location and elevation;

[0043] 3) Overlapping and fixing: Use wire rope clamps 3 to overlap and fix the corresponding upper main reinforcement 101 and lower main reinforcement 201;

[0044] 4) Complete the connection: Repeat the above steps to connect and fix each upper main bar 101 and lower main bar 201 to complete the connection of the entire steel cage.

[0045] The lap length of the upper main reinforcement 101 and the lower main reinforcement 201, as well as the number and position of the wire rope clamps 3, need to be determined or verified by mechanical tests.

[0046] The size and model of the wire rope clamp 3 are determined according to the models of the upper main reinforcement 101 and the lower main reinforcement 201.

[0047] In its specific implementation, this invention proposes a novel connection method to address the problems of traditional methods. This method uses wire rope clamps to lap and secure the upper and lower main reinforcing bars. The lap length and the number of wire rope clamps can be specified in Appendix A of the standard "Wire Rope Clamps" (GB / T5976-2006). However, since this new process is being used for segmented connections of reinforcing cages for the first time, the specific number of wire rope clamps and the lap length of the main reinforcing bars need to be verified through relevant testing experiments to ensure the safety and reliability of the connection.

[0048] Technical parameters:

[0049] Operating temperature range: 0℃~40℃;

[0050] Working pressure: ≤0.8MPa;

[0051] Connection method: Steel wire rope clamps are used to overlap and fix the main reinforcement bars;

[0052] Applicable steel cage types: Q235B, Q345B, etc.

[0053] This invention has undergone numerous experiments, rigorous testing and evaluation, and has achieved the expected design and usage effects. Specifically:

[0054] Tensile strength test: The test results of the steel bar specimens made according to the lap length and quantity specified in Appendix A of "Steel Wire Rope Clamps" (GB / T5976-2006) show that the device can withstand the ultimate tensile load, and the firmness and stability of the connection meet the design and use requirements.

[0055] Durability test: Within the specified service life, the connecting device did not show obvious wear and damage, demonstrating good durability and reliability.

[0056] Safety testing: Under various working conditions, the connection device can ensure the safety of personnel and equipment and comply with relevant safety standards and specifications.

[0057] The above tests demonstrate that our product has excellent performance and reliability, and can play an important role in various engineering applications.

[0058] This invention has the following characteristics:

[0059] High efficiency: The device adopts a simple mechanical structure, is easy and quick to operate, and greatly improves construction efficiency.

[0060] Reversibility: The device is reasonably designed and can adapt to steel cages of different diameters and lengths, making it easy to replace and adjust.

[0061] Reliability: Steel wire rope clamps are used to overlap and fix the main reinforcement bars, ensuring the firmness and stability of the connection.

[0062] Safety: During installation and use, the device complies with relevant safety standards and specifications, and can effectively prevent personal injury and equipment damage during use.

[0063] In summary, the connection structure and method described in this invention have significant advantages and application value in the segmented connection of reinforcing cages for cast-in-place pile foundations. It not only solves the problems of traditional connection methods but also improves construction efficiency and quality, reduces costs and environmental pollution, and avoids safety hazards during the production process. Therefore, this new technology should be given priority in practical engineering projects.

[0064] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A segmented connection structure for the reinforcing cage of a cast-in-place pile foundation, characterized in that: It includes an upper section of reinforcing cage and a lower section of reinforcing cage. The upper section of reinforcing cage includes upper main bars and upper stirrups, and the lower section of reinforcing cage includes lower main bars and lower stirrups. The upper and lower main reinforcing bars are lapped and fixed by wire rope clamps.

2. The segmented connection structure of the reinforcing cage for a cast-in-place pile foundation according to claim 1, characterized in that: The wire rope clamp includes a U-bolt, a clamp seat, and a nut; After the U-bolt passes through the lap joint of the upper and lower main reinforcing bars, a clamp is inserted into the threaded end of the U-bolt, and a nut is screwed in. The three work together to fix the lap joint and form a stable connection structure.

3. The segmented connection structure of the reinforcing cage for a cast-in-place pile foundation according to claim 1, characterized in that: The lap length between the upper and lower main reinforcement bars shall not be less than 35d.

4. A method for segmented connection of reinforcing cages in cast-in-place pile foundations, characterized in that, Specifically, the following steps are included: 1) Prepare tools and materials: Prepare the corresponding tools and materials according to the drawings and specifications, including the upper section of the reinforcing cage, the lower section of the reinforcing cage, and wire rope clamps; 2) Positioning and adjustment: Position and adjust the reinforcing cage according to its location and elevation; 3) Overlapping and fixing: Use wire rope clamps to overlap and fix the corresponding upper and lower main reinforcement bars; 4) Complete the connection: Repeat the above steps to connect and fix each upper and lower main reinforcement bar to complete the connection of the entire steel cage.

5. The method for segmented connection of the reinforcing cage of a cast-in-place pile foundation according to claim 4, characterized in that: The lap length between the upper and lower main reinforcement bars, as well as the number and location of wire rope clamps, need to be determined or verified through mechanical tests.

6. The method for segmented connection of the reinforcing cage of a cast-in-place pile foundation according to claim 4, characterized in that: The size and model of the wire rope clamp are determined according to the models of the upper and lower main reinforcing bars.

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