Rectangular hollow pile connecting device capable of resisting large bending moment

Abstract

The utility model provides a rectangular hollow pile connecting device capable of resisting large bending moment. The rectangular hollow pile connecting device comprises an upper pile body and a lower pile body, a first connecting flange is arranged at the bottom end of the upper pile body, a convex socket head is arranged at the lower end of the first connecting flange, and the socket head and the first connecting flange are of an integrally formed structure; a second connecting flange is arranged at the top end of the lower pile body, a concave socket groove is correspondingly formed in the upper end of the second connecting flange, the inclination angle of the socket head and the socket face of the socket groove is 3-5 degrees, and the socket head is embedded into the socket groove to form geometric self-locking connection. Wherein the spigot-and-socket head is in a trapezoid shape, corrugated shear grooves are formed in the side edge of the spigot-and-socket head, and the corrugated shear grooves are continuously formed in the length direction of the side edge of the spigot-and-socket head. The rectangular hollow pile connecting device is high in overall strength, so that the large bending moment can be effectively resisted, and the structural stability and safety are guaranteed.

Description

Technical Field

[0001] This application relates to the field of civil engineering pile foundation technology, and in particular to a rectangular hollow pile connection device that can resist large bending moments. Background Technology

[0002] In building construction, pile foundations are a common type of foundation. Rectangular hollow piles are widely used due to their high strength and stiffness, as well as their material-saving advantages. In practical projects, it is often necessary to vertically connect multiple rectangular hollow piles to meet different engineering requirements. However, existing pile connection structures often fail to meet the requirements for connection strength and stability when subjected to horizontal forces and bending moments, making them prone to failure at the connection points and affecting the overall load-bearing capacity of the pile foundation. Utility Model Content

[0003] In view of this, this application provides a rectangular hollow pile connection device that can resist large bending moments, so as to solve the problem that the existing connection structure is not strong enough to withstand horizontal forces and bending moments.

[0004] This embodiment provides a rectangular hollow pile connection device that can resist large bending moments, including an upper pile body and a lower pile body that are joined together vertically:

[0005] The bottom end of the upper pile body is provided with a first connecting flange, the inner diameter of the first connecting flange matches the outer contour of the upper pile body, and the lower end of the first connecting flange is provided with an outwardly protruding socket, the socket and the first connecting flange are integrally formed.

[0006] The top of the lower pile body is provided with a second connecting flange. The inner diameter of the second connecting flange matches the outer contour of the lower pile body. The upper end of the second connecting flange is provided with a recessed socket. The inclination angle between the socket and the socket surface is 3-5°. The socket is embedded in the socket to form a geometric self-locking connection.

[0007] The socket is trapezoidal in shape, and corrugated shear grooves are arranged on the side of the socket, which are continuously arranged along the length of the side of the socket.

[0008] The upper pile body has a cross-arranged steel mesh embedded inside the bearing plug, and the steel mesh is welded to the main reinforcement of the upper pile body to form an integral load-bearing skeleton.

[0009] The upper pile body has a wear-resistant layer on the surface that forms the corrugated shear groove.

[0010] The ratio of the top width to the bottom width of the trapezoidal shear key is 1:1.5.

[0011] The first connecting flange and the second connecting flange are provided with multiple bolt holes, and the upper pile body and the lower pile body are fixedly connected by bolts that pass through the bolt holes.

[0012] The first connecting flange has 4-8 bolt holes, which are evenly distributed along the circumference of the first connecting flange; the second connecting flange has 4-8 bolt holes, which are evenly distributed along the circumference of the second connecting flange.

[0013] The rectangular hollow pile connection device provided in this embodiment, capable of resisting large bending moments, utilizes annular connecting flanges on the upper and lower pile bodies. These flanges are fitted with socket and slot structures, with the socket surfaces angled at 3-5° to create a geometric self-locking effect. This transforms the horizontal component of the bending moment into normal force, enhancing the anti-slip capability of the connection interface and improving the horizontal load-bearing capacity of the pile. Furthermore, the trapezoidal shear keys at the four corners of the socket effectively resist interfacial shear forces, and their structural design ensures uniform shear stress distribution, preventing stress concentration. Additionally, the corrugated shear grooves on the sides of the socket, with their serrated edges, increase the friction coefficient, allowing it to withstand stronger shear loads compared to traditional smooth interfaces. The rectangular hollow pile connection device provided in this embodiment exhibits high overall strength, effectively resisting large bending moments and ensuring structural stability and safety. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the connection device provided in the embodiments of this application;

[0016] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure of the connecting device provided in the diagram on line AA;

[0017] Figure 3 This is a schematic diagram of the structure of the second connecting flange provided in an embodiment of this application;

[0018] Figure 4 This is a schematic diagram of the structure of the first connecting flange provided in an embodiment of this application;

[0019] Figure 5 This is a top view of the upper pile structure provided in the embodiment of this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1-Connecting device, 10-Upper pile body, 20-Lower pile body, 30-First connecting flange, 40-Second connecting flange, 50-Reinforcing bar, 60-Prestressed steel bar, 11-Socket plug, 21-Socket slot, 31-Bolt hole, 32-Bolt, 112-Corrugated shear groove. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0024] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 This application provides a rectangular hollow pile connection device 1 capable of resisting large bending moments, comprising an upper pile body 10 and a lower pile body 20 connected vertically. The lower end of the upper pile body 10 is provided with a first connecting flange 30, the inner diameter of which matches the outer contour of the upper pile body 10. The lower end of the first connecting flange 30 is provided with a protruding socket 11, which is integrally formed with the first connecting flange 30. The top end of the lower pile body 20 is provided with a second connecting flange 40, the inner diameter of which matches the outer contour of the lower pile body 20. The upper end of the second connecting flange 40 is correspondingly provided with a recessed socket 21. The inclination angle between the socket 11 and the socket 21 is 3-5°, and the socket 11 of the upper pile body 10 is embedded in the socket 21 of the lower pile body 20 to form a geometrically self-locking connection. The socket 11 is trapezoidal in shape, and a corrugated shear groove 112 is arranged on the side of the socket 11. The corrugated shear groove 112 is arranged continuously along the length direction of the side of the socket 11.

[0025] The upper pile body 10 and the lower pile body 20 are both rectangular hollow piles, and the pile body material is C80 high-strength concrete.

[0026] The first connecting flange 30 is disposed around the upper pile body 10 and is fixedly connected to the upper pile body 10. The second connecting flange 40 is disposed around the lower pile body 20 and is fixedly connected to the lower pile body 20.

[0027] In this embodiment, the socket surfaces of the plug 11 and the socket 21 are inclined at an angle, that is, the socket surfaces are inclined at 3-5° relative to the longitudinal extension direction of the pile body, forming a geometric self-locking effect of inclined wedge tightening, so that the horizontal component force generated by the upper pile body 10 and the lower pile body 20 under the action of bending moment is converted into the normal pressure of the contact surface, thereby improving the anti-slip ability of the connection interface and improving the horizontal force bearing capacity of the pile body.

[0028] Specifically, the socket 11 is trapezoidal in shape, thus forming a trapezoidal shear key on its circumference, which can effectively resist interfacial shear force. Its trapezoidal structure design ensures that the shear stress is evenly distributed along the height of the key, avoiding stress concentration. Furthermore, the socket 11 is also continuously arranged with corrugated shear grooves 112 on its side. The corrugated shear grooves 112 increase the friction coefficient of the contact interface through their concave and convex tooth shape, which has a stronger shear load capacity compared to the traditional smooth interface.

[0029] In summary, the rectangular hollow pile connection device 1 capable of resisting large bending moments provided in this embodiment utilizes annular connecting flanges on the upper pile body 10 and lower pile body 20, respectively. A socket 11 and a socket slot 21 are installed on the annular connecting flanges, with the socket surface inclined at a 3-5° angle to create a geometric self-locking effect. This converts the horizontal component of the bending moment into normal pressure, enhancing the anti-slip capability of the connection interface and improving the horizontal load-bearing capacity of the pile. Furthermore, the trapezoidal shear key formed by the socket 11 effectively resists interfacial shear force, and its structural design ensures uniform shear stress distribution, avoiding stress concentration. In addition, the corrugated shear groove 112 on the side of the socket 11, with its concave-convex tooth shape, increases the friction coefficient and can withstand stronger shear loads compared to traditional smooth interfaces. The rectangular hollow pile connection device 1 provided in this embodiment has high overall strength, thus effectively resisting large bending moments and ensuring structural stability and safety.

[0030] Please see Figure 2 and Figure 5In this embodiment, both the upper pile body 10 and the lower pile body 20 are internally provided with reinforcing bars 50 and prestressed steel bars 60. Specifically, the upper pile body 10 has a cross-arranged steel mesh embedded inside the socket 11, and the steel mesh is welded to the main reinforcement of the upper pile body 10 to form an integral load-bearing skeleton, which effectively enhances the local strength and toughness of the shear key area. The steel mesh can restrain the deformation of concrete under high stress, preventing cracks from forming at the root of the shear key due to stress concentration. Simultaneously, through welding with the main reinforcement, the shear force borne by the shear key is quickly and evenly transferred to the entire pile body, improving the cooperative load-bearing capacity of the shear key and the pile body when subjected to large bending moments, further ensuring the integrity and stability of the connection structure.

[0031] Please refer to it again. Figure 4 In this embodiment, the upper pile body 10 has a wear-resistant layer on the surface forming the corrugated shear groove 112, which can significantly improve the wear resistance of the surface where the corrugated shear groove 112 is located. During long-term exposure to horizontal forces and bending moments, the wear-resistant layer can effectively reduce the wear of the shear groove caused by friction and compression, avoid the reduction of the friction coefficient and the weakening of the shear load capacity due to excessive surface wear, thereby extending the service life of the connecting device 1, continuously ensuring the stability and reliability of the connection between the upper and lower pile bodies 20, and ensuring that the rectangular hollow pile connecting device 1 maintains good working performance under complex stress environments.

[0032] Please refer to it again. Figure 4 Preferably, the ratio of the top width to the bottom width of the socket 11 is 1:1.5. When resisting interfacial shear force, the shear stress is more evenly distributed along the height direction of the key body, which enhances the engagement stability between the shear key and the socket component. When subjected to horizontal force and bending moment, the two components can cooperate more firmly to bear the force.

[0033] Please refer to it again. Figure 1 , Figure 3 and Figure 4 In another embodiment of this application, both the first connecting flange 30 and the second connecting flange 40 are provided with a plurality of bolt holes 31, and the upper pile body 10 and the lower pile body 20 are fixedly connected by bolts 32 passing through the bolt holes 31.

[0034] The first connecting flange 30 has 4-8 bolt holes, evenly distributed along its circumference, and the second connecting flange 40 has 4-8 bolt holes, also evenly distributed along its circumference. In this embodiment, using multiple evenly distributed bolts to fix the first connecting flange 30 and the second connecting flange 40 further ensures the tightness of the pile connection, provides reliable axial tensile and compressive bearing capacity for the upper and lower piles, and enhances the connection strength and stability.

[0035] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.

Claims

1. A rectangular hollow pile connection device capable of resisting large bending moments, comprising an upper pile body and a lower pile body joined together vertically, characterized in that: The bottom end of the upper pile body is provided with a first connecting flange, the inner diameter of the first connecting flange matches the outer contour of the upper pile body, and the lower end of the first connecting flange is provided with an outwardly protruding socket, the socket and the first connecting flange are integrally formed. The lower pile body is provided with a second connecting flange at its top end. The inner diameter of the second connecting flange matches the outer contour of the lower pile body. The upper end of the second connecting flange is provided with a recessed socket. The inclination angle between the socket and the socket surface is 3-5°. The socket of the upper pile body is embedded in the socket of the lower pile body to form a geometric self-locking connection. The socket is trapezoidal in shape, and corrugated shear grooves are arranged on the side of the socket, which are continuously arranged along the length of the side of the socket.

2. The connection device of claim 1, wherein The upper pile body has a cross-arranged steel mesh embedded inside the bearing plug, and the steel mesh is welded to the main reinforcement of the upper pile body to form an integral load-bearing skeleton.

3. The connection device of claim 1, wherein The upper pile body has a wear-resistant layer on the surface that forms the corrugated shear groove.

4. The connection device of claim 1, wherein The ratio of the top width to the bottom width of the connector is 1:1.

5.

5. The connection device of claim 1, wherein Both the first connecting flange and the second connecting flange are provided with multiple bolt holes, and the upper pile body and the lower pile body are fixedly connected by bolts that pass through the bolt holes.

6. The connection device of claim 5, wherein The first connecting flange has 4-8 bolt holes, which are evenly distributed along the circumference of the first connecting flange; the second connecting flange has 4-8 bolt holes, which are evenly distributed along the circumference of the second connecting flange.

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