A wedge-shaped dry connection node and a fabricated concrete wall panel

Abstract

The utility model belongs to the field of fabricated building structure discloses a kind of wedge dry-type connecting joint and fabricated concrete wallboard, the utility model is cooperated with the structure of wedge head embedded part and wedge steel cover plate, make node significantly superior to traditional bolt connection in stress and energy dissipation performance. Wedge occlusion interface can form friction slip zone under tension, shear effect, to effectively consume seismic energy, improve the ductility and energy dissipation capacity of node, avoid the problem that existing dry-type connection energy dissipation is insufficient, and brittle failure is concentrated. The stress path of the node is clear, and the force is transmitted to the embedded end plate after being decomposed by the wedge surface, and then is uniformly transmitted into the wall body by the anchoring steel bar, making the stress more uniform and reducing the risk of local shear and concrete punching damage of the bolt. The wedge structure has self-centering characteristics, which can automatically position and form reliable clamping force during assembly, reducing the precision requirement of on-site construction, and avoiding the uneven stress problem caused by traditional bolt pre-tightening time and hole deviation.

Description

Technical Field

[0001] This utility model belongs to the field of prefabricated building structures, specifically relating to a wedge-shaped dry connection node and a prefabricated concrete wall panel. Background Technology

[0002] Prefabricated construction is a new type of building structure system with advantages such as high construction efficiency, controllable quality, and good environmental performance. It has been widely used in various building scenarios such as residences, schools, and hospitals. Concrete wall panels are an indispensable prefabricated component in prefabricated construction. They can be mass-produced in factories, making construction more convenient and efficient. As a key link in the industrialization of construction, the connection nodes of prefabricated concrete wall panels are directly related to the overall stability and safety performance of the structure. Especially under the action of external forces such as earthquakes and wind loads, the stiffness and ductility of the connection nodes play an important role in ensuring the structural integrity and maintaining normal functionality.

[0003] Currently, among the connection technologies for prefabricated concrete wall panels, the dry bolt connection system has significant advantages due to its extreme construction speed and disassembly capability, especially the in-plane bolt connection, which is considered an important development direction. However, this connection technology also has some problems to be solved: (1) In terms of structural performance, the energy dissipation capacity of dry connection nodes is usually slightly weaker than that of cast-in-place nodes and wet connection nodes, which may lead to more concentrated structural damage when subjected to strong earthquakes. (2) The connection part is subjected to complex stresses, and the bolts may be subject to shear failure, and the surrounding concrete may be at risk of local insufficient bearing pressure or punching shear failure. (3) The requirements for construction accuracy are extremely stringent. Even a small installation deviation may cause uneven stress on the node. Some bolt connection methods have problems such as difficult processing, time-consuming bolt pre-tightening, and positioning errors, which limit the construction efficiency. (4) Dry connection nodes may have problems such as bolt loosening, corrosion, and wear, which affect the reliability of long-term use. Summary of the Invention

[0004] The purpose of this utility model is to overcome the problems of poor energy consumption, complex stress, difficult construction, easy loosening and corrosion, and insufficient reliability of existing prefabricated concrete wall panel connections, and to provide a wedge-shaped dry connection node and prefabricated concrete wall panel.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: In the first aspect, this utility model provides a wedge-shaped dry connection node, including two wedge-shaped head embedded parts, which are arranged in a mirror image; The wedge-shaped head embedded part includes an embedded end plate. Anchor bars and studs are provided on one side of the embedded end plate, and a steel plate with a wedge-shaped head is provided on the other side. The steel plates with wedge-shaped heads of two wedge-shaped head embedded parts are connected by a wedge-shaped steel cover plate.

[0006] A further improvement of this utility model is that the far end of the steel plate with wedge head is the wide part of the wedge shape, and the middle part of the wedge-shaped steel cover plate has an inclined surface that matches the profile of the wide part of the wedge shape at the far end of the steel plate with wedge head; during assembly, the inclined surface of the wedge-shaped steel cover plate fits against the wedge profile of the two steel plates with wedge head.

[0007] A further improvement of this utility model is that the distal wedge-shaped wide portion of the steel plate with the wedge head and the inclined surface of the wedge-shaped steel cover plate are both rough surfaces.

[0008] A further improvement of this utility model is that the steel plate with the wedge head is connected to the wedge-shaped steel cover plate by connecting bolts.

[0009] A further improvement of this utility model is that two elongated holes are provided on the wedge-shaped steel cover plate, and a round hole is provided on the steel plate with the wedge-shaped head. The connecting bolt passes through the round hole of the steel plate with the wedge-shaped head and is fixedly connected to the elongated hole on the wedge-shaped steel cover plate.

[0010] A further improvement of this utility model is that a disc spring is fitted on the connecting bolt.

[0011] A further improvement of this utility model is that the anchoring steel bars are in two sets, which are respectively set on the upper and lower parts of the side of the embedded end plate. The ends of the anchoring steel bars on the upper side of the embedded end plate are bent upward, and the ends of the anchoring steel bars on the lower side of the embedded end plate are bent downward.

[0012] A further improvement of this utility model is that the studs are fixed between two sets of anchoring steel bars on the side of the pre-embedded end plate.

[0013] Secondly, this utility model provides a prefabricated concrete wall panel, including a first wall panel and a second wall panel. Several wedge-shaped head embedded parts are respectively provided on the end faces of the first wall panel and the second wall panel. The wedge-shaped head embedded parts of the first wall panel and the wedge-shaped head embedded parts corresponding to the positions of the second wall panel are connected by a wedge-shaped steel cover plate.

[0014] A further improvement of this utility model is that a reserved rectangular groove is provided at the connection between the first wall panel and the second wall panel. The height of the reserved rectangular groove is the thickness of the first wall panel and the second wall panel, and the height of the reserved rectangular groove is greater than the height of the embedded end plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention, through the mating structure of a wedge-shaped head embedded part and a wedge-shaped steel cover plate, significantly outperforms traditional bolted connections in terms of stress and energy dissipation performance. The wedge-shaped interlocking interface forms a friction slip zone under tension and shear, effectively dissipating seismic energy, improving the ductility and energy dissipation capacity of the joint, and avoiding the problems of insufficient energy dissipation and concentrated rigid-brittle failure in existing dry connections. The force path of this joint is clear; the force is decomposed through the wedge surface and transmitted to the embedded end plate, and then evenly transmitted into the wall by the anchoring steel bars, making the force more uniform and reducing the risk of local shear failure of bolts and concrete punching shear failure. The wedge structure has self-centering characteristics, automatically positioning itself and forming a reliable clamping force during assembly, reducing the accuracy requirements for on-site construction, simplifying installation steps, and avoiding the problems of uneven force distribution caused by time-consuming pre-tightening and hole position deviations in traditional bolts. Since there are no exposed bolts in the joint, the overall structure fits tightly, preventing loosening of the connection, and the surface sealing protection improves corrosion and rust resistance, ensuring long-term stability and safety. Meanwhile, the node is highly modular, which facilitates later maintenance and replacement, and has comprehensive benefits such as convenient construction, reliable connection, excellent seismic performance and strong durability.

[0016] Furthermore, this invention achieves automatic guidance and tight fit during assembly by setting a wedge-shaped wide section at the distal end of the wedge-shaped steel plate and forming a matching inclined surface in the middle of the wedge-shaped steel cover plate. This enables the formation of uniform surface contact pressure when the node is under stress, avoiding stress concentration and improving the stress stability and force transmission efficiency of the connection. The wedge structure with the inclined surface can generate a self-locking effect under external force, preventing the node from loosening and enhancing vibration and impact resistance. At the same time, the rough surface design of the wedge-shaped steel plate and the wedge-shaped steel cover plate can significantly increase the interfacial friction coefficient, improve the energy dissipation capacity during the slip phase, and give the node good energy dissipation performance and ductility under earthquakes or cyclic loads. After assembly, the rough wedge surface can further enhance the friction locking effect, avoid loosening or gap changes caused by fretting wear, and improve the long-term reliability and durability of the node. Therefore, this improved structure has significant comprehensive benefits in terms of force transmission, anti-loosening, corrosion prevention, and energy dissipation.

[0017] Furthermore, this invention reliably connects the wedge-headed steel plate and the wedge-shaped steel cover plate with connecting bolts, enhancing the overall pull-out and shear resistance of the joint while maintaining the wedge-shaped self-locking characteristics. The elongated hole design on the wedge-shaped steel cover plate provides a certain assembly adjustment margin, effectively compensating for construction errors and positional deviations, reducing on-site alignment difficulties, ensuring smooth assembly, and making the stress distribution more uniform. After the round hole and elongated hole on the wedge-headed steel plate are connected, a slight slippage is allowed when the structure is under stress, thereby forming a friction energy dissipation zone and improving the energy dissipation and seismic performance of the joint under dynamic forces such as earthquakes. The disc spring fitted on the bolt can continuously provide elastic preload when the joint is subjected to vibration or temperature changes causing minor deformation, preventing bolt loosening due to vibration, relaxation, or wear, and maintaining long-term clamping effect and structural stability. The buffering effect of the disc spring can also absorb transient impact energy, reduce stress concentration, and extend the service life of the connecting components. In summary, this design achieves multiple beneficial effects, including flexible assembly and adjustment, stable and reliable stress distribution, excellent seismic resistance and energy dissipation, and long-term anti-loosening protection, while ensuring high-strength structural connections.

[0018] Furthermore, this invention establishes two sets of anchoring steel bars on the upper and lower parts of the side of the embedded end plate, with the upper steel bar bent upwards and the lower steel bar bent downwards, forming a symmetrical spatial anchoring system. This significantly enhances the bond strength and anchorage length between the embedded end plate and the concrete. The arrangement of the bent steel bars effectively prevents slippage and pull-out of the steel bars under tension or shear, improving the overall synergistic performance and pull-out bearing capacity of the joint during stress. The studs placed between the two sets of anchoring steel bars further enhance the mechanical interlocking effect between the embedded end plate and the concrete, allowing shear force to be shared by the studs and bent steel bars, resulting in smoother and more uniform force transmission. This combined anchoring method not only improves the joint's shear, pull-out, and peel resistance but also effectively inhibits cracking and localized damage to the concrete around the embedded part, extending the joint's service life. Overall, this design has significant comprehensive benefits in enhancing anchorage reliability, improving stress distribution, and increasing the joint's ductility and seismic performance. Attached Figure Description

[0019] 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 utility model includes a side wall panel and a wedge-shaped embedded part. Figure 4 This is a perspective view of the wedge-shaped embedded part of this utility model; Figure 5 This is a top view of the wedge-shaped embedded part of this utility model; Figure 6This is a perspective view of the wedge-shaped steel cover plate of this utility model; Figure 7 This is a perspective view of the wall panel connection node of this utility model; Figure 8 This is a top view of the wall panel connection node of this utility model; Figure 9 This is a cross-sectional view of the wall panel connection node of this utility model; Figure 10 This is a diagram showing the stress and deformation of the connection node of this utility model; Among them, 1. First wall panel; 2. Second wall panel; 3. Wedge-shaped steel cover plate; 3-1. Oblong hole; 4. Connecting bolt; 5. Wedge-shaped head embedded part; 5-1. Steel plate with wedge-shaped head; 5-2. Embedded end plate; 5-3. Anchoring steel bar; 5-4. Stud; 5-5. Round hole. Detailed Implementation

[0020] 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.

[0021] The prefabricated concrete wall panel wedge-shaped dry connection node of this embodiment includes a prefabricated concrete wall panel, a wedge-shaped head embedded part, and a wedge-shaped steel cover plate.

[0022] See Figure 1 and 2 The 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.

[0023] See Figure 3 , 4 The wedge-shaped head embedded part 5 includes a wedge-shaped head steel plate 5-1, an embedded end plate 5-2, an anchoring steel bar 5-3, and a stud 5-4. The wedge-shaped head steel plate 5-1 is a steel plate that extends outward from one side of a straight steel plate to form a double-sloping wedge structure, with a circular hole 5-5 for bolts to pass through at the junction of the plane and the slope. The embedded end plate 5-2 is a rectangular steel plate, which is welded perpendicularly to the straight end of the wedge-shaped head steel plate 5-1. The anchoring steel bar 5-3 is an ordinary steel bar bent into a π shape, with its top straight section welded to the other unwelded surface of the embedded end plate 5-2. The stud 5-4 is also welded to the other unwelded surface of the embedded end plate 5-2 to enhance the anchoring performance of the embedded part in concrete, ultimately forming the wedge-shaped head embedded part 5.

[0024] See Figure 6The wedge-shaped steel cover plate 3 is a rectangular steel plate with an inward double-sloping structure in the middle that matches the wedge head. The plate has elongated holes 3-1 on both sides for bolt connection and to accommodate installation deviations.

[0025] See Figure 7 , 8 In addition to 9, the inclined surfaces of the wedge-shaped steel cover plate 3 and the wedge-shaped head embedded part 5 match each other, and the inclined surfaces can be roughened to increase friction. The wedge-shaped steel cover plate 3 and the wedge-shaped head embedded part 5 are only tightly fitted in the inclined area, and there is a certain gap on the straight surface. The force direction can be converted by tightening with bolts.

[0026] The first wall panel 1 and the second wall panel 2 have a pre-reserved rectangular groove at the connection point. The height of the pre-reserved groove is approximately the thickness of the wall panel, but should be greater than the height of the pre-embedded end plate. The length of the pre-reserved groove is 1.5 to 2.0 times the width of the wall, and slightly greater than the overall length of the wedge-shaped head pre-embedded part 5, to ensure that the pre-embedded part does not exceed the boundary plane of the wall panel.

[0027] The middle part of the wedge-shaped steel cover plate 3 is a weak point, which can be reinforced by thickening the middle area or by using high-strength steel such as 60Si2MnA or 50CrMn.

[0028] The wedge-shaped head embedded part 5 has a wedge-shaped head steel plate 5-1 as the core component. The embedded end plate 5-2, anchoring steel bar 5-3 and stud 5-4 are mainly used to achieve anchoring with the concrete wall panel. The anchoring method can be adjusted according to different types of prefabricated wall panels.

[0029] The connecting bolt 4 can be combined with a disc spring to enable the wedge-shaped steel cover plate to return to its original position after deformation under stress, thereby enhancing the seismic toughness of the prefabricated concrete wall panel.

[0030] See Figure 10 The working process of this utility model is as follows: When the first wall panel 1 and the second wall panel 2 generate outward tensile force, the wedge-shaped head embedded part 5 in the wall panel opens horizontally. The horizontal force is converted into vertical tension through the wedge mechanism, causing the front and rear wedge-shaped steel cover plates 3 to open. Then, the pre-tightening force provided by the connecting bolts 4 constrains the opening of the wedge-shaped steel cover plates 3, realizing the connection of the wall panels. During the entire stress deformation process, the materials of the wedge-shaped steel cover plates 3 and the wedge-shaped head embedded part 5 are in the elastic stage. The greater the deformation, the stronger the connection force, and it can provide additional frictional energy dissipation.

[0031] The installation process of the prefabricated concrete wall panel wedge-shaped dry connection node of this utility model is as follows: 1) Tie the reinforcing bars of the precast concrete wall panels in the factory, fix the wedge-shaped head embedded parts 5 in the design position, tie the anchoring reinforcing bars 5-3 to the wall panel reinforcing cage in a reasonable staggered manner, and then pour concrete to form the first wall panel 1 and the second wall panel 2.

[0032] 2) Align the two wall panels horizontally on site, ensuring that the vertical joints are tight and the wedge-shaped head embedded parts 5 are at the same height; 3) Install the wedge-shaped steel cover plate 3 at the connection position on both sides of the joint, and then insert the connecting bolt 4 into its horizontal strip hole and tighten it to complete the dry connection of the prefabricated concrete wall panel.

[0033] This invention features a reliable connection and superior load-bearing performance. The wedge-shaped structure effectively converts the horizontal forces between wall panels into vertical tension, while the bolt system provides constraint, forming a self-locking mechanism to prevent bolt shear failure. During stress, the material of this joint remains in an elastic phase, and the greater the deformation, the stronger the connection force, exhibiting excellent load-bearing capacity and deformation adaptability. Furthermore, the inclined surface friction provides additional energy dissipation, enhancing the joint's seismic resistance.

[0034] This utility model boasts strong tolerance and convenient, efficient installation. The horizontal slots on the wedge-shaped steel cover plate provide adjustment space for bolt installation, accommodating certain component dimensions and positioning deviations, thus reducing the stringent requirements for prefabrication and installation accuracy. This connection method eliminates the need for on-site welding or grouting, significantly simplifying the construction process and greatly improving the installation efficiency of wall panels, truly achieving "time-saving and labor-saving" dry construction.

[0035] This utility model has a reasonable structure, ensuring anchoring and durability. The wedge-shaped embedded part integrates the embedded end plate, π-shaped anchoring steel bar, and studs to form a multiple anchoring system, ensuring reliable force transmission with the concrete wall panel. In addition, by adopting high-strength steel, local reinforcement, or adding combined disc springs, the strength, toughness, durability, and reset capability of the joint during long-term use are further improved.

[0036] This utility model is highly adaptable and has good promotional value. The node structure is clear, and the embedded parts and connecting plates are all standardized components, making it suitable for different types of prefabricated wall panel systems. Its anchoring method can be adjusted according to the specific wall panel type, offering high design and construction flexibility, and demonstrating good engineering applicability and promotion prospects.

[0037] 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 wedge-shaped dry connection node, characterized in that, Includes two wedge-shaped head embedded parts (5), and the two wedge-shaped head embedded parts (5) are mirrored; The wedge-shaped head embedded part (5) includes an embedded end plate (5-2). An anchoring steel bar (5-3) and a stud (5-4) are provided on one side of the embedded end plate (5-2), and a steel plate with a wedge-shaped head (5-1) is provided on the other side. The steel plates with wedge-shaped heads (5-1) of the two wedge-shaped head embedded parts (5) are connected by a wedge-shaped steel cover plate (3).

2. The wedge-shaped dry connection node according to claim 1, characterized in that, The far end of the wedge-shaped steel plate (5-1) is the wide part of the wedge shape, and the middle part of the wedge-shaped steel cover plate (3) is provided with a slope that matches the profile of the wide part of the wedge shape at the far end of the wedge-shaped steel plate (5-1); during assembly, the slope of the wedge-shaped steel cover plate (3) fits against the wedge profile of the two wedge-shaped steel plates (5-1).

3. A wedge-shaped dry connection node according to claim 2, characterized in that, The distal wedge-shaped wide portion of the wedge-shaped steel plate (5-1) and the inclined surface of the wedge-shaped steel cover plate (3) are both rough surfaces.

4. A wedge-shaped dry connection node according to claim 1, characterized in that, The steel plate with wedge head (5-1) is connected to the wedge steel cover plate (3) by connecting bolts (4).

5. A wedge-shaped dry connection node according to claim 4, characterized in that, Two elongated holes (3-1) are opened on the wedge-shaped steel cover plate (3), and a round hole (5-5) is opened on the wedge-shaped steel plate (5-1). The connecting bolt (4) passes through the round hole (5-5) of the wedge-shaped steel plate (5-1) and is fixedly connected to the elongated hole (3-1) on the wedge-shaped steel cover plate (3).

6. A wedge-shaped dry connection node according to claim 4 or 5, characterized in that, A disc spring is fitted on the connecting bolt (4).

7. A wedge-shaped dry connection node according to claim 1, characterized in that, The anchoring steel bars (5-3) are in two sets, which are respectively set on the upper and lower parts of the side of the embedded end plate (5-2). The ends of the anchoring steel bars (5-3) on the upper side of the embedded end plate (5-2) are bent upward, and the ends of the anchoring steel bars (5-3) on the lower side of the embedded end plate (5-2) are bent downward.

8. A wedge-shaped dry connection node according to claim 7, characterized in that, The stud (5-4) is fixed between the two sets of anchoring steel bars (5-3) on the side of the pre-embedded end plate (5-2).

9. A prefabricated concrete wall panel, based on the wedge-shaped dry connection node as described in claim 1, characterized in that, It includes a first wall panel (1) and a second wall panel (2). Several wedge-shaped head embedded parts (5) are respectively provided on the end faces of the first wall panel (1) and the second wall panel (2). The wedge-shaped head embedded parts (5) of the first wall panel (1) and the wedge-shaped head embedded parts (5) corresponding to the positions of the second wall panel (2) are connected by a wedge-shaped steel cover plate (3).

10. A prefabricated concrete wall panel according to claim 9, characterized in that, The first wall panel (1) and the second wall panel (2) have a reserved rectangular groove at the connection point. The height of the reserved rectangular groove is the thickness of the first wall panel (1) and the second wall panel (2). The height of the reserved rectangular groove is greater than the height of the embedded end plate (5-2).

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