A quick connection device suitable for the end of a prefabricated assembled pile foundation

Abstract

The present invention is a quick connection device suitable for the end of a prefabricated pile foundation. It comprises nine parts: a reinforced concrete prefabricated pile segment (1), a pile end connector (2), a high-strength connection nail (3), a reserved plug hole (4), a reserved glue injection hole (5), a semi-cylinder (6), a spring (7), a central axis (8), and a reserved channel (9). The characteristics are as follows: ① The use of a prefabricated pile foundation overcomes the disturbance of the traditional bored pile foundation to the environment and the stratum, which is beneficial to protecting the ecological environment of special areas. ② The pile foundation segment and its connection device are all standardized and prefabricated in the factory, which effectively improves the efficiency of pile foundation construction. A self-locking device is arranged inside the connection device, which simplifies the process of on-site assembly construction. ③ The present invention performs sealing treatment at the joint, which effectively blocks the erosion of the connection by external factors, greatly improving the durability of the pile foundation connection and the integrity of the pile foundation after assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of prefabricated assembled pile foundation connection methods, and in particular is a quick connection device suitable for the end of a prefabricated assembled pile foundation. Background Art

[0002] Pile foundation is a foundation form with high bearing capacity, wide application range and long history. With the improvement of production level and the development of science and technology, the construction technology and application scope of pile foundation have greatly developed, and it is widely used in high-rise buildings, ports, bridges and other projects. Traditional bored piles have high requirements for construction technology during construction. They have the disadvantages of labor-intensive and time-consuming construction, slow hole-making speed, and difficult processing, and the construction quality is difficult to control. For some special areas, bored piles will increase the disturbance of the soil, resulting in changes in the physical properties of the soil around the piles and reducing the bearing capacity of the pile foundation. Taking the pile foundation in the permafrost area as an example, the bored pile foundation will cause thermal disturbance effect on the permafrost, which will lead to the melting of snow and ice fields, accelerate the degradation of frozen soil, affect the bearing performance of the pile foundation, and then reduce the service life of the bridge.

[0003] As a new green construction method, prefabricated construction has great development advantages in engineering construction. Prefabricated pile foundation is a new type of pile foundation. It is achieved by prefabricating pile foundation segments of a certain length in the factory in advance, transporting them to the construction site for splicing and assembly. Therefore, the connection method is required to be simple and fast, and the connection must have sufficient strength to withstand the load. However, the current application of prefabrication in engineering structures is mainly based on above-ground structures, and prefabricated construction is rarely used in underground structures. Research on the use of prefabricated pile foundations is still in its early stages. The technology for prefabricated construction of underground structures is still immature, and the connection method is relatively simple. Therefore, the invention of a quick connection device suitable for the end of a prefabricated pile foundation is of great significance to the development of prefabrication in my country's engineering structures. Summary of the invention

[0004] In order to improve construction efficiency, reduce environmental disturbance caused by construction, ensure construction quality and save resources, the present invention provides a quick connection device for the end of prefabricated pile foundation. The connection device has the advantages of convenient and quick construction, high construction efficiency and small environmental disturbance. The technical solution adopted by the present invention is:

[0005] A quick connection device for the end of a prefabricated assembled pile foundation comprises nine parts: a reinforced concrete prefabricated pile segment (1), a pile end connector (2), a high-strength connection nail (3), a reserved plug hole (4), a reserved glue injection hole (5), a semi-cylinder (6), a spring (7), a central axis (8), and a reserved channel (9). The device is characterized in that the reinforced concrete prefabricated pile segment (1) is prefabricated in a standardized manner in a factory, the pile end connector (2) is a steel component, and is welded to the longitudinal reinforcement of a steel cage before the prefabricated pile is cast, and then the reinforced concrete pile is cast, so that the pile end connector (2) and the reinforced concrete prefabricated pile segment (1) are connected as a whole. The central axis (8) is located at the center of the semi-cylinder (6) and serves as a rotation axis for the semi-cylinder (6), and the spring (7) provides a pulling force for the rotation of the semi-cylinder (6). The high-strength connection nail (3) and the reserved socket (4) correspond to each other, and the number of the high-strength connection nail (3) can be adjusted according to the actual engineering requirements. The reserved socket (4) is provided with a spring and a slider for locking the high-strength connection nail (3). When assembling at the construction site, the two ends of the high-strength connection nail (3) are respectively inserted into the reserved socket (4) and locked by the self-locking device provided inside. At the same time, the semi-cylinder (6) will also lock the adjacent pile end connector (2) under the action of the spring (7), connecting the two prefabricated pile segments into a whole. After the assembly is completed, the sealant is injected into the reserved injection hole (5). The sealant is injected from one end, passes through the reserved channel (9), and flows out from the reserved injection hole at the other end, indicating that the injection is completed. The purpose is to seal the gap existing in the pile end connector (2) after the docking is completed, prevent external factors from entering the end connector (2) and causing the rust of the steel, and also increase the integrity of the pile foundation after the connection, making the connection tighter. The sealant is required to have a fast setting speed and good sealing effect to improve the efficiency of on-site construction.

[0006] The advantages and beneficial effects of the present invention are as follows: 1. The prefabricated assembled pile foundation adopted by the present invention has the advantages of small disturbance to the stratum and small pollution to the environment, which is beneficial to protecting the ecological environment of special areas. Compared with traditional bored cast-in-place piles, the construction of prefabricated assembled pile foundation improves the reliability and efficiency of construction. 2. The prefabricated pile segments and connecting devices of the present invention are all prefabricated in the factory and can be assembled after being transported to the construction site, and the connection method is simple and easy to operate, which effectively improves the construction efficiency. 3. The connecting device adopted by the present invention has the same structure at both ends of the prefabricated pile segment, and both adopt corresponding concave and convex steel components, so that the connection is tightly fitted, and the efficiency of factory prefabrication and on-site installation is also improved. 4. The outer shape of the connecting device of the present invention adopts a convex cone, which can be better positioned during on-site assembly, so that the ends of the prefabricated pile segments can be quickly aligned when docking, reducing the difficulty of construction. 5. The present invention reserves glue injection holes and channels at the joints of the connection device, and the glue injection and sealing are carried out after the prefabricated pile segments are connected. The operation is simple and the sealing is good, which reduces the erosion of environmental factors on the connection device and greatly improves the durability of the pile foundation connection and the integrity of the pile foundation after assembly. 6. The connection device used in the present invention has a simple structure and is easy to operate. The number of high-strength connectors and reserved jacks can be adjusted according to the needs of the actual project, which increases the flexibility of construction.

[0007] Description of the drawings: Figure 1 The present invention is an overall schematic diagram of a quick connection device suitable for the end of a prefabricated assembled pile foundation. Figure 2 The present invention is a top view of a quick connection device suitable for the end of a prefabricated assembled pile foundation. Figure 3 The present invention is a front view of a quick connection device suitable for the end of a prefabricated assembled pile foundation. Figure 4 It is a detailed structural drawing of reserved glue injection holes, reserved channels, reserved sockets, and high-strength connecting staples. Figure 5 The invention discloses a connection process diagram of a quick connection device suitable for the end of a prefabricated assembled pile foundation.

[0008] Specific implementation method: The present invention is further described below in conjunction with the accompanying drawings: the overall layout of the present invention and the detailed components are as follows Figures 1 to 4 As shown, Figure 5The present invention is a process diagram of the precast pile connection. The present invention comprises nine parts: a reinforced concrete precast pile segment (1), a pile end connector (2), a high-strength connection nail (3), a reserved plug hole (4), a reserved glue injection hole (5), a semi-cylinder (6), a spring (7), a central axis (8), and a reserved channel (9). In the specific implementation process, the reinforced concrete precast pile segment (1) is prefabricated in a standardized manner in a factory, and the pile end connector (2) is fixed to the end of the precast pile segment (1). The central axis (8) is located at the center of the semi-cylinder (6), and its two ends are fixed to the end connector (2) so that the semi-cylinder (6) can rotate around the central axis (8). The spring (7) is located on the outside of the semi-cylinder (6) and is used to provide a pulling force for the rotation of the semi-cylinder (6). The reserved plug holes (4) are evenly distributed around the edge of the pile end connector (2), and a spring and a slider are arranged therein. The spring is located on the inner side of the slider to provide thrust for the sliding of the slider, and the shape of the slider matches the reserved groove on the high-strength connection nail (3). The two ends of the high-strength connection nail (3) are respectively inserted into the reserved plug holes (4) on the two adjacent pile end connectors (2), and the slider slides into the reserved groove on the high-strength connection nail (3) for locking. The reserved glue injection holes (5) and the reserved channels (9) are both located at the joints between the end connectors (2), and the reserved channels (9) are distributed along the edge of the pile end connector (2). The reserved glue injection holes (5) are arranged at both ends of the joints between the end connectors (2) to connect the reserved channels (9) with the outside. After assembly is completed, sealant is injected into the reserved injection hole (5) and passed through the reserved channel (9) until it flows out from the injection hole on the other side, indicating that the injection is completed, thereby ensuring the sealing and durability of the joint. Before prefabrication of the prefabricated pile segment (1), the pile end connector (2) is first welded to the longitudinal reinforcement of the prefabricated pile reinforcement cage, and then the prefabricated pile segment is cast, so that the prefabricated pile segment (1) and the pile end connector (2) are connected as a whole. The central axis (8) is the rotating axis of the semi-cylinder (6), and the spring (7) provides the pulling force for the rotation of the semi-cylinder. The number of high-strength connection pins (3) and reserved sockets (4) can be adjusted according to the needs of the actual project. A spring and a slider are arranged in the reserved socket (4), and the shape of the slider matches the groove reserved on the high-strength connection pin (3). During assembly, the ends of the prefabricated pile segments are first docked, and the semi-cylinder (6) is squeezed and rotated. At the same time, the slider in the reserved socket (4) is squeezed and moved to both sides. After docking, the semi-cylinder (6) locks the pile end connector (2) under the tensile action of the spring (7), and the slider inside the reserved socket (4) also locks the high-strength connection nail (3) under the action of the spring. Then, glue is injected into the reserved glue injection hole (5), injected from the glue injection hole at one end, through the reserved channel (9), and out of the glue injection hole at the other end, to ensure that the sealant fills the entire reserved channel. The purpose of glue injection is to seal the gap after connection to prevent external factors from entering the connection device and corroding the steel.The entire connection device has good sealing performance, and the environmental factors have little erosion on the components, which ensures the strength and durability of the connection. The pile foundation connection components mentioned above coordinate with each other and work together to form a prefabricated pile foundation connection device that is easy to operate and tightly connected.

[0009] The shape of the pile end connector adopts corresponding concave and convex steel components. After the connection is completed, the inside of the pile end connector fits tightly, ensuring the overall stiffness of the pile foundation after the connection is completed. A spring is set inside the connection device to make the internal structure self-locking after the docking is completed. Glue injection holes and channels are reserved at the joints of the pile end connector after the docking is completed. Sealant is injected into the channel through the glue injection hole to seal the connection.

Claims

1. A quick connection device for the end of a prefabricated pile foundation, comprising a reinforced concrete prefabricated pile segment (1), a pile end connector (2), a high-strength connection nail (3), a reserved insertion hole (4), a reserved glue injection hole (5), a semi-cylinder (6), a spring (7), a central axis (8), and a reserved channel (9), wherein the device is characterized by: The reinforced concrete prefabricated pile segment (1) is prefabricated in a standardized manner in a factory, and the pile end connector (2) is fixed to the end of the prefabricated pile segment (1); the central axis (8) is located at the central part of the semi-cylinder (6), and its two ends are fixed to the pile end connector (2) so that the semi-cylinder (6) can rotate around the central axis (8), and the spring (7) is located on the outside of the semi-cylinder (6) to provide a pulling force for the semi-cylinder (6) to rotate; the reserved plug holes (4) are evenly distributed around the edge of the pile end connector (2), and springs and sliders are arranged therein, and the springs are located on the inner side of the slider to provide thrust for the sliding of the slider, and the shape of the slider matches the groove reserved on the high-strength connection nail (3); The two ends of the high-strength connection nail (3) are respectively inserted into the reserved insertion holes (4) on the two adjacent pile end connectors (2), and the slider slides into the reserved groove on the high-strength connection nail (3) to lock; the reserved glue injection hole (5) and the reserved channel (9) are both located at the joint between the pile end connectors (2), the reserved channel (9) is distributed along the edge of the pile end connector (2), and the reserved glue injection hole (5) is arranged at both ends of the joint between the pile end connectors (2), so as to connect the reserved channel (9) with the outside; after the assembly is completed, the sealant is injected into the reserved glue injection hole (5) and passes through the reserved channel (9) until it flows out from the glue injection hole on the other side, indicating that the injection is completed, thereby ensuring the sealing and durability of the joint.

2. A quick connection device for the end of a prefabricated pile foundation according to claim 1, characterized in that The shape of the pile end connector adopts corresponding concave and convex steel components. After the connection is completed, the inside of the pile end connector fits tightly, ensuring the overall rigidity of the pile foundation after the connection is completed.

3. A quick connection device for the end of a prefabricated pile foundation according to claim 1, characterized in that A spring is arranged inside the connection device to make the internal structure self-locking after the docking is completed.

4. A quick connection device for the end of a prefabricated pile foundation according to claim 1, characterized in that The shape of the connecting devices all adopts a convex cone shape, which can better position them during on-site installation and construction.

5. The quick connection device for the end of a prefabricated pile foundation according to claim 1 is characterized in that After the pile end connectors are butt-jointed, glue injection holes and channels are reserved at the joints, and sealants are injected into the channels through the glue injection holes to seal the joints.

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