A boltless slotting and clamping interlocking connection node and fabricated concrete wall panel

Abstract

The utility model belongs to the field of fabricated building structure discloses a kind of boltless slotting interlocking connection node and fabricated concrete wallboard, the utility model is connected between components by slotting interlocking structure and realizes self-locking, without bolt can be quickly assembled, avoid the strict dependence of traditional bolt connection on manufacturing precision. Interlocking and corrugated steel plate inlay structure can effectively disperse stress, reduce the risk of hole weakening and stress concentration, significantly improve the bearing capacity and seismic performance of node. The geometric cooperation of U-shaped hook section and straight section realizes stable engagement, prevents connection loosening and displacement, and improves the reliability of long-term service.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated building structure, specifically relating to a boltless slotted tooth interlocking connection node and a prefabricated concrete wall panel. Background Technology

[0002] Prefabricated construction, as a core form of building industrialization, has become an important direction for the transformation and upgrading of the modern construction industry due to its significant advantages such as high construction efficiency, controllable quality, energy conservation, and environmental protection. In this system, various prefabricated components, such as concrete wall panels, floor slabs, beams, and columns, are mass-produced in factories and then transported to the construction site for assembly and connection. Among them, prefabricated concrete wall panels, as key components of the enclosure structure and space partition, directly determine the integrity, safety, and construction efficiency of the building through the performance of their connection nodes.

[0003] The connection nodes between precast concrete wall panels not only need to bear various loads such as the self-weight of the wall panels, wind loads, and seismic forces to ensure the overall stability of the structure and the reliability of the force transmission path, but also must have sufficient deformation capacity to adapt to displacements caused by temperature changes and foundation settlement. Therefore, the design of connection nodes is of paramount importance in the design of prefabricated structures, and their performance directly affects the structural safety, functionality, and durability of the building.

[0004] Currently, dry bolt connections are the most widely used in on-site installation. Although this method is convenient to construct, it has several inherent defects: (1) Bolt connections require extremely high precision in the fabrication of prefabricated components, and slight dimensional deviations may lead to installation difficulties or even make assembly impossible; (2) A large number of bolt holes need to be pre-set at the edge of the wall panel, which not only weakens the component cross-section but also easily causes stress concentration around the holes, affecting the load-bearing capacity and seismic performance of the joint; (3) Bolts may have problems such as loosening, corrosion, and wear, affecting the reliability of long-term use, and exposed metal parts may form "thermal bridges," affecting the thermal insulation performance of the building. Therefore, developing a new type of dry connection joint that does not require bolts, has a reasonable structure, is convenient to install, and has superior stress performance is of great significance for promoting the further development of prefabricated buildings. Summary of the Invention

[0005] The purpose of this utility model is to overcome the problems of high precision requirements, easy loosening, stress concentration and poor heat insulation of existing dry bolt connections, and to provide a boltless slotted tooth interlocking connection node and prefabricated concrete wall panel.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, this utility model provides a boltless slotted tooth interlocking connection node, including a first slotted tooth connector and a second slotted tooth connector, wherein the first slotted tooth connector and the second slotted tooth connector are arranged in opposite directions, and the first slotted tooth connector and the second slotted tooth connector have the same structure. The first slotted toothed connector includes an L-shaped toothed steel plate, which includes a U-shaped hook section and a straight section. When the straight section is connected to the U-shaped hook section, it is bent inward into a Z-shape to form an interface into which the straight section of the second slotted toothed connector is inserted. Two inner corrugated steel plates are provided in the U-shaped hook section, and an anchoring corrugated steel plate is provided on the straight section. A first rectangular slot is provided on the U-shaped hook section to insert the anchoring corrugated steel plate, and a second rectangular slot is provided on the straight section to insert the inner corrugated steel plate.

[0007] A further improvement of this utility model is that the inner side of the L-shaped toothed steel plate is provided with triangular locking teeth, and the U-shaped hook section is provided with triangular locking teeth that cooperate with and fix the triangular locking teeth of the L-shaped toothed steel plate.

[0008] A further improvement of this utility model is that a diamond-shaped opening is provided on the anchoring corrugated steel plate.

[0009] A further improvement of this invention is that the diamond-shaped opening is located in the middle of the anchoring corrugated steel plate.

[0010] A further improvement of this utility model is that the two inner corrugated steel plates are respectively located at the third point of the width direction of the steel plate within the U-shaped hook section.

[0011] A further improvement of this utility model is that both the inner corrugated steel plate and the anchoring corrugated steel plate are corrugated thin steel plates.

[0012] A further improvement of this invention is that the two second rectangular slots are located at the third points on the straight section.

[0013] A further improvement of this utility model is that a stud is provided on the straight section.

[0014] Secondly, this utility model provides a prefabricated concrete wall panel, including a first wall panel and a second wall panel. The side of the first wall panel is provided with a plurality of first slotted tooth connectors, and the side of the second wall panel is provided with a plurality of reserved rectangular grooves at the same positions as the first slotted tooth connectors. The reserved rectangular grooves are provided with second slotted tooth connectors.

[0015] A further improvement of this utility model is that the height of the reserved rectangular groove is greater than the height of the second slotted toothed connector, and the height of the space inside the reserved rectangular groove is greater than the height of the U-shaped hook section on the L-shaped toothed steel plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This invention achieves self-locking connections between components through a slotted tooth structure, enabling rapid assembly without bolts and avoiding the strict reliance on manufacturing precision required by traditional bolted connections. The interlocking tooth structure and corrugated steel plate interlocking effectively disperse stress, reducing the risk of weakening from holes and stress concentration, significantly improving the load-bearing and seismic performance of the joint. The geometric fit between the U-shaped hook section and the straight section ensures a stable engagement, preventing loosening and displacement, and enhancing long-term reliability. The internal corrugated steel plates interlock to form multi-point contact surfaces, enhancing the shear and tensile strength of the joint. The absence of exposed metal bolts avoids thermal bridging, improving the thermal insulation performance of the wall. The overall structure is modular and easy to assemble, allowing for rapid installation and disassembly, making it suitable for highly prefabricated building systems.

[0017] Furthermore, this invention incorporates interlocking triangular teeth on the inner side of the L-shaped toothed steel plate and within the U-shaped hook section, enabling multi-point engagement and mechanical self-locking during assembly. This enhances the stability and anti-slip capability of the joint connection. The meshing structure of the triangular teeth provides bidirectional restraint during stress, preventing relative displacement or loosening of the connecting parts and strengthening the shear and pull-out resistance of the joint. Simultaneously, the interlocking action between the teeth effectively disperses local stress, reducing the risk of stress concentration and further improving the overall stress uniformity and durability of the joint. Moreover, this self-locking interlocking connection requires no additional fasteners, resulting in high assembly efficiency, simple construction, and ensuring the safety and reliability of the structure during long-term service.

[0018] Furthermore, the anchor of this invention features diamond-shaped openings on the corrugated steel plate, which allows the joint to form a local deformation buffer zone under stress, reducing stress concentration and improving overall ductility and energy dissipation capacity. The arrangement of the diamond-shaped openings facilitates the penetration of concrete or grouting materials into the corrugated steel plate, increasing the bonding strength between the steel plate and surrounding materials and enhancing the overall collaborative performance of the joint. The openings, located in the center, achieve stress balance during tension and shear, preventing local tearing or early failure and optimizing the force transmission path. In addition, the diamond-shaped openings provide multi-directional interlocking surfaces, making the anchoring more robust and stable, while also incorporating lightweight design, reducing material usage, and improving the economy and ease of construction of the joint.

[0019] Furthermore, the use of studs on the straight sections of this invention significantly improves the mechanical interlocking between the connector and the concrete or grout layer, enhancing the interfacial shear force transmission capacity and pull-out resistance. Under load, the studs effectively transfer longitudinal and lateral loads, preventing slippage or peeling of the connector and improving the overall load-bearing stability of the joint. Their protruding structure allows for multi-point anchoring with surrounding materials, improving the joint's seismic energy dissipation performance and ductility. Simultaneously, the stud arrangement improves stress distribution, reduces stress concentration, and delays fatigue and failure, thereby enhancing the structure's durability and long-term reliability. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is an exploded assembly diagram of the present invention; Figure 3 This is the first wall panel and connector of the present utility model; Figure 4 This is a perspective view of the slotted toothed connector of this utility model; Figure 5 This is a front view of the slotted toothed connector of this utility model; Figure 6 This is a top view of the slotted toothed connector of this utility model; Figure 7 This is a right view of the slotted toothed connector of this utility model; Figure 8 This invention relates to the second wall panel and connector. Figure 9 This is a perspective view of the wall panel connection node of this utility model; Figure 10 This is a front view of the wall panel connection node of this utility model; Figure 11 This is a top view of the wall panel connection node of this utility model; Figure 12 This is a right view of the wall panel connection node of this utility model; Among them, 1. First wall panel; 2. Second wall panel; 3. First slotted toothed connector; 3-1. L-shaped toothed steel plate; 3-2. Inner corrugated steel plate; 3-3. Anchored corrugated steel plate; 3-4. First rectangular slot; 3-5. Diamond opening; 3-6. Stud; 3-7. Second rectangular slot; 3-1-1. U-shaped hook section; 3-1-2. Straight section; 4. Second slotted toothed connector. Detailed Implementation

[0021] To further understand the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are merely illustrative and not intended to limit the scope of the invention.

[0022] The boltless assembled concrete wall panel slotted tooth interlocking connection node of this embodiment includes a precast concrete wall panel, a first slotted tooth connector and a second slotted tooth connector.

[0023] See Figure 1 and 2The precast concrete wall panel includes a first wall panel 1 and a second wall panel 2; the first wall panel 1 is a precast component made of steel bars and concrete structure and cast in a factory, and its design complies with relevant specifications; the second wall panel 2 is the same as the first wall panel 1, and is a standard precast component, which is convenient for on-site assembly.

[0024] See Figure 3 and 4 The first slotted toothed connector 3 includes an L-shaped toothed steel plate 3-1, an inner corrugated steel plate 3-2, an anchoring corrugated steel plate 3-3, a rectangular slot 3-4, a diamond-shaped opening 3-5, and a stud 3-6. The L-shaped toothed steel plate 3-1 includes a U-shaped hook section 3-1-1 and a straight section 3-1-2. When the straight section 3-1-2 is connected to the U-shaped hook section 3-1-1, it is bent inward into a Z-shape to form an interface for inserting the straight section 3-1-2 of the second slotted toothed connector 4. Two inner corrugated steel plates 3-2 are provided inside the U-shaped hook section 3-1-1. An anchoring corrugated steel plate 3-3 is provided on the straight section 3-1-2. A first rectangular slot 3-4 is provided on the U-shaped hook section 3-1-1 to allow the anchoring corrugated steel plate 3-3 to be inserted. A second rectangular slot 3-7 is provided on the straight section 3-1-2 to allow the inner corrugated steel plate 3-2 to be inserted.

[0025] See Figure 4 and 5 The L-shaped toothed steel plate 3-1 is formed by bending a straight steel plate into an L shape. The straight section has an inwardly recessed triangular groove carved on the outer side, and the hook section has outwardly protruding triangular teeth carved on the inner side. In addition, the straight section of the L-shaped steel plate 3-1 is further bent inward into a Z shape to form an interface for the other end connector 4 to be inserted.

[0026] See Figure 4 , 5 In addition to 6, the inner corrugated steel plate 3-2 is a thin steel plate bent into a corrugated shape, which is vertically arranged inside the U-shaped hook section 3-1-1 of the L-shaped toothed steel plate 3-1 and located at one-third of the width direction of the steel plate, in order to enhance local rigidity and connection stability; the anchoring corrugated steel plate 3-3 is also a corrugated thin steel plate, which is set at the upper center of the straight section 3-1-2 of the L-shaped toothed steel plate 3-1 and faces outward, and achieves effective anchoring with the concrete in the first wall panel 1 through its corrugated structure.

[0027] See Figure 4 and 7 The rectangular slots 3-4 are respectively set at the middle of the U-shaped hook section 3-1-1 and the third point of the straight section 3-1-2 of the L-shaped toothed steel plate 3-1, and are vertical through slots.

[0028] See Figure 4 and 5The diamond-shaped opening 3-5 is located in the middle of the anchoring corrugated steel plate 3-2 to further enhance the mechanical engagement with the concrete wall panel; the stud 3-6 is welded to the lower part of the straight section of the L-shaped toothed steel plate 3-1, and together with the anchoring corrugated steel plate 3-3, it improves the anchoring performance between the connector and the wall panel.

[0029] See Figure 8 The second slotted toothed connector 4 has the same structure as the first slotted toothed connector 3. During installation, it is rotated 180° and then anchored to the corresponding position of the second wall panel 2.

[0030] See Figure 2 , 9 During assembly, the second wall panel 2 is hoisted to the side of the first wall panel 1, so that the first slotted toothed connector 3 and the second slotted toothed connector 4 on the two wall panels are accurately positioned. Then, relying on the weight of the second wall panel 2, the L-shaped toothed steel plates of the two are inserted into each other and locked in place, thus completing the dry connection of the wall panels.

[0031] See Figure 2 The lower straight section of the first slotted toothed connector 3 coincides with the side surface of the first wall panel 1, and the entire connection protrudes from the side surface of the wall; the upper part of the first slotted toothed connector 1 has a certain gap with the side surface of the wall to facilitate the insertion of the second wall panel connector 4.

[0032] See Figure 8 The second wall panel 2 has a pre-reserved rectangular groove at the connection point. The height of the pre-reserved groove is greater than the height of the second slotted toothed connector 4, and the height of the pre-reserved space is not less than the height of the hook section of the L-shaped toothed steel plate 3-1 to facilitate assembly.

[0033] See Figure 9 and 10 The protruding and recessed triangular teeth of the first slotted toothed connector 3 match each other, and its material can be high-strength steel such as 60Si2MnA and 50CrMn.

[0034] The inner corrugated steel plate 3-2 and the anchoring corrugated steel plate 3-3 can ensure that the L-shaped toothed steel plate 3-1 is inserted into the required deformation during assembly and provide sufficient rigidity to prevent the teeth from slipping out.

[0035] The installation process of this utility model's boltless assembled concrete wall panel slotted interlocking connection node is as follows: 1) In the factory, according to the design drawings, the first wall panel 1 and the second wall panel 2 are constructed using reinforced concrete. Before pouring the concrete, the first slotted toothed connector 1 is precisely fixed to the designated position of the side formwork of the first wall panel, ensuring that its anchoring corrugated steel plate and studs are completely embedded in the concrete and reliably connected to the reinforcing steel skeleton; after rotating the second slotted toothed connector 4 180°, it is anchored to the corresponding position of the second wall panel 2 in the same way and in the reserved rectangular groove.

[0036] 2) Carry out on-site hoisting and preliminary alignment. Install the first wall panel 1 in place and temporarily support and fix it. Use hoisting equipment to lift the second wall panel 2 and move it to the side of the first wall panel 1 that has been in place, so that the two wall panels are on the same plane and their edges are close to each other.

[0037] 3) Precisely align and lock the connection. Slowly move the second wall panel so that the second slotted toothed connector 4 on it is precisely aligned with the first slotted toothed connector 3 on the first wall panel 1 in both the vertical and horizontal directions. Under the action of gravity, slowly lower the second wall panel 2. At this time, the L-shaped toothed steel plate on the upper part of connector II 4 will be inserted into the Z-shaped interface of the L-shaped toothed steel plate 3-1 of connector I 3 in the first wall panel 1. The triangular teeth on the two sets of L-shaped toothed steel plates are fully engaged with the slots, producing a "click" sound or a clear feeling of sinking, thus achieving mechanical interlocking.

[0038] 4) Joint treatment: After confirming that the connection is reliable, remove the temporary support and fill the joints between the wall panels and the exposed reserved grooves with materials such as expanding foam, cement-based grout or sealant.

[0039] This invention boasts extremely high assembly efficiency, enabling truly dry construction. Through a plug-and-play interlocking principle, the core connection is completed solely by the wall panel's own weight after hoisting, completely eliminating cumbersome wet operations such as bolt tightening, welding, or on-site grouting. This greatly simplifies the construction process, shortens the construction period, and significantly improves the assembly efficiency of the wall panels. The connection of this invention is reliable, with superior load-bearing performance. The triangular interlocking force transmission method forms a highly efficient mechanical rigid connection, ensuring excellent shear and pull-out resistance in both vertical and horizontal directions. This invention has strong tolerance and is easy to install. The reserved gap at the top of the connector and the reserved groove design on the wall panel provide necessary operating space for hoisting and insertion, allowing for a certain degree of installation alignment error. The design of the L-shaped steel plate Z-shaped interface and the inner corrugated steel plate provides rigidity while also possessing a certain guiding and micro-deformation capability, guiding the connector to smoothly slide into the predetermined position and tightly engage, reducing the precision requirements for component manufacturing and installation. This utility model boasts excellent structural rigidity and stability. The inner corrugated steel plate not only enhances the local rigidity of the connector itself but, more importantly, effectively prevents excessive deformation of the L-shaped steel plate under stress, ensuring the locking teeth remain tightly engaged, preventing accidental slippage, and guaranteeing the long-term stability of the joint. The rational layout of the connectors allows them to work collaboratively with the wall panel to share the load. This utility model saves materials by eliminating a large number of bolts, nuts, and other fasteners and matching metal parts, reducing material costs. The first and second slotted locking tooth connectors use the same standard component, requiring only a 180° rotation for use, reducing the types of components and facilitating standardized and large-scale production in factories. Flexible layout: The number and arrangement of connectors can be flexibly adjusted according to the actual wall panel size and stress conditions, offering strong design adaptability. After assembly, the joint area can be easily sealed with materials such as expanding foam, grout, or sealant, meeting the building's functional requirements for thermal insulation, sound insulation, and fireproofing, while also protecting the metal connectors and enhancing the aesthetics.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A boltless slotted tooth interlocking connection node, characterized in that, It includes a first slotted tooth connector (3) and a second slotted tooth connector (4), the first slotted tooth connector (3) and the second slotted tooth connector (4) are arranged in opposite directions, and the first slotted tooth connector (3) and the second slotted tooth connector (4) have the same structure. The first slotted toothed connector (3) includes an L-shaped toothed steel plate (3-1). The L-shaped toothed steel plate (3-1) includes a U-shaped hook section (3-1-1) and a straight section (3-1-2). When the straight section (3-1-2) is connected to the U-shaped hook section (3-1-1), it is bent inward into a Z-shape to form an interface for inserting the straight section (3-1-2) of the second slotted toothed connector (4). Two inner corrugated steel plates (3-2) are provided in the U-shaped hook section (3-1-1). An anchoring corrugated steel plate (3-3) is provided on the straight section (3-1-2). A first rectangular slot (3-4) is provided on the U-shaped hook section (3-1-1) to insert the anchoring corrugated steel plate (3-3). A second rectangular slot (3-7) is provided on the straight section (3-1-2) to insert the inner corrugated steel plate (3-2).

2. The boltless slotted tooth interlocking connection node according to claim 1, characterized in that, The inner side of the L-shaped toothed steel plate (3-1) is provided with triangular teeth, and the U-shaped hook section (3-1-1) is provided with triangular teeth that cooperate with and fix the triangular teeth of the L-shaped toothed steel plate (3-1).

3. The boltless slotted tooth interlocking connection node according to claim 1, characterized in that, The anchoring corrugated steel plate (3-3) has diamond-shaped openings (3-5).

4. The boltless slotted tooth interlocking connection node according to claim 3, characterized in that, The diamond-shaped opening (3-5) is located in the middle of the anchoring corrugated steel plate (3-3).

5. A boltless slotted tooth interlocking connection node according to claim 1, characterized in that, The two inner corrugated steel plates (3-2) are located at the third point of the width direction of the inner steel plate of the U-shaped hook section (3-1-1).

6. A boltless slotted tooth interlocking connection node according to claim 1 or 5, characterized in that, Both the inner corrugated steel plate (3-2) and the anchoring corrugated steel plate (3-3) are corrugated thin steel plates.

7. A boltless slotted tooth interlocking connection node according to claim 1, characterized in that, The two second rectangular slots (3-7) are located at the third point on the straight section (3-1-2).

8. A boltless slotted tooth interlocking connection node according to claim 1, characterized in that, A bolt (3-6) is installed on the straight section (3-1-2).

9. A prefabricated concrete wall panel, based on the boltless slotted interlocking connection node as described in claim 1, characterized in that, It includes a first wall panel (1) and a second wall panel (2). The side of the first wall panel (1) is provided with a number of first slotted tooth connectors (3). The side of the second wall panel (2) is provided with a number of reserved rectangular slots in the same position as the first slotted tooth connectors (3). The reserved rectangular slots are provided with second slotted tooth connectors (4).

10. A prefabricated concrete wall panel according to claim 9, characterized in that, The height of the reserved rectangular groove is greater than the height of the second slotted toothed connector (4), and the height of the space inside the reserved rectangular groove is greater than the height of the U-shaped hook section (3-1-1) on the L-shaped toothed steel plate (3-1).

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