A connecting box and connecting structure suitable for connecting reinforced concrete slabs

Abstract

The utility model provides a kind of connecting box and connecting structure suitable for reinforced concrete slab body connection belongs to building engineering technical field.It solves the problem of the connecting box processing cumbersome in prior art.The connecting box of this reinforced concrete slab body connection includes: at least by two steel plate bending to form a box body structure with opening, the box body structure includes side and the bottom of connecting each side, and the position of bottom is oppositely arranged with the position of opening, wherein, the side is closed structure setting, and connecting hole is arranged on one side of side, as the connecting part when adjacent two reinforced concrete slab bodies are connected, when connecting box is embedded in reinforced concrete slab body, the side of connecting hole is not higher than the surface of the reinforced concrete slab body of the side of this box body structure.The utility model has the advantages of improving processing convenience, optimizing structural stability and economy.

Description

Technical Field

[0001] This utility model relates to the field of building engineering technology, specifically to a connection box for connecting reinforced concrete slabs and a connection structure including the connection box. Background Technology

[0002] In the construction of precast reinforced concrete structures, reliable connections between slabs (such as wall panels and floor slabs) are crucial for ensuring the integrity and safety of the structure. Bolted connections are widely used in slab connection scenarios due to their advantages such as detachability, high load-bearing capacity, and convenient construction. As a key embedded component in bolted connections, the structural design of the bolt box directly affects the connection quality, cost, and construction efficiency.

[0003] In existing technologies, traditional bolted connection boxes often adopt a structure of "multiple steel plates welded together," for example, some connection boxes require five independent steel plates to be welded together. This structure has the following obvious drawbacks:

[0004] Poor processing convenience: The cutting, positioning and welding of multiple steel plates are complicated, and the relative positions of the steel plates need to be adjusted many times to ensure dimensional accuracy. The labor cost is high, the production efficiency is low, and it is difficult to adapt to the needs of industrialized mass production.

[0005] Insufficient structural stability: A large number of welds are concentrated at the joints of steel plates, which are prone to cracking due to concentrated welding stress. Especially under long-term loads or vibration loads, the overall stiffness of the connecting box decreases, affecting the reliability of the bolted connection. Utility Model Content

[0006] The purpose of this utility model is to provide a connection box and connection structure suitable for connecting reinforced concrete slabs, so as to solve the problems of complicated processing, high cost and insufficient structural stability of the connection box in the prior art.

[0007] This utility model can be achieved through the following technical solutions:

[0008] A connection box suitable for connecting reinforced concrete slabs, comprising:

[0009] A box structure with an opening is formed by bending at least two steel plates. The box structure includes a side and a bottom connecting the sides, with the bottom positioned opposite to the opening. The side is a closed structure, and a connecting hole is provided on one side of the side as a connection point when two adjacent reinforced concrete slabs are connected. When the connecting box is embedded in the reinforced concrete slab, the side with the connecting hole is not higher than the surface of the reinforced concrete slab on the side where the box structure is located.

[0010] In the aforementioned connection box suitable for connecting reinforced concrete slabs, when there are two steel plates, the box structure includes a first steel plate and a second steel plate. The first steel plate is U-shaped, and the second steel plate is L-shaped. The two sides of the open end and the closed end of the first steel plate are part of the side structure of the box structure. One end of the second steel plate is another part of the side structure of the box structure, and the other end of the second steel plate is the bottom of the box structure. The two sides of the open end serve as the first side plate of the box structure, the closed end serves as the second side plate of the box structure, one end of the second steel plate serves as the third side plate of the box structure, and the other end of the second steel plate serves as the bottom plate of the box structure.

[0011] In the aforementioned connection box suitable for connecting reinforced concrete slabs, the thickness of the first steel plate at both open ends is equal to the thickness of the closed ends, and the thickness of the second steel plate at both ends is equal, wherein the thickness of the first steel plate is greater than the thickness of the second steel plate.

[0012] In the aforementioned connection box suitable for connecting reinforced concrete slabs, the first steel plate and the second steel plate are respectively formed into U-shaped and L-shaped structures by bending. The first side plate and the second side plate are connected by an arc-shaped bend, and the third side plate and the bottom plate are connected by an arc-shaped bend.

[0013] In the aforementioned connection box suitable for connecting reinforced concrete slabs, the connection hole is located on the second side plate, and the diameter of the connection hole is larger than the outer diameter of the connecting parts to be connected.

[0014] A connection structure suitable for connecting reinforced concrete slabs, comprising:

[0015] The aforementioned connecting box is embedded in one of the adjacent reinforced concrete slabs when they are connected, and the side of the connecting box with the connecting hole is flush with the side wall of the reinforced concrete slab. The opening of the connecting box faces outward and is in an exposed state.

[0016] The connector has one end embedded in the other of two adjacent reinforced concrete slabs when they are connected, and the other end is exposed. When two adjacent reinforced concrete slabs are connected, the exposed end of the connector is inserted into the connection hole of the connection box, and the connection between the connector and the connection box is locked by fasteners.

[0017] In the above-mentioned connection structure applicable to reinforced concrete slabs, the end of the connector that is connected to the connecting box is provided with an external thread. When the connector is inserted into the connecting box through the connecting hole, there is a gap between the end face of the end with the external thread and the opposite side of the connecting box where the connecting hole is located.

[0018] In the above-mentioned connection structure applicable to reinforced concrete slabs, one end of the connector located inside the reinforced concrete slab is bent, and the bend is either bent toward the interior of the corresponding reinforced concrete slab or is hook-shaped.

[0019] In the above-mentioned connection structure applicable to reinforced concrete slabs, at least one anchor bar is provided in the reinforced concrete slab where the connection box is located, and the anchor bar is attached to the side of the connection box and fixed by welding.

[0020] In the above-mentioned connection structure applicable to reinforced concrete slabs, there are four anchor bars, located on both sides of the connection box, and the length directions of the four anchor bars are parallel to each other. The four anchor bars are welded and fixed to the upper side of the connection box.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. Improved processing convenience: The box structure is manufactured in one piece through a bending forming process, replacing the traditional process of "welding five steel plates together". For example, the first and second steel plates are bent into multiple continuous sections in one bending process, which reduces the number of steel plate cuts and welding times, reduces the dependence on processing equipment and manual skills, is suitable for industrial mass production, and greatly improves processing efficiency.

[0023] 2. Structural stability and economic optimization: The first steel plate, as the main load-bearing component (first side plate and second side plate), bears the load transmitted by the bolts. The second steel plate (third side plate and bottom plate) forms a closed structure through welding. While ensuring the overall strength, the amount of the first steel plate is reduced, thus reducing material costs. At the same time, the arc-shaped bend avoids stress concentration at right-angle splices and improves the fatigue resistance of the structure.

[0024] 3. Enhanced anchoring reliability: The synergistic effect of the connecting box and the anchor bars enables the connecting box and the concrete wall panel to form a multi-dimensional anchoring system, effectively transmitting tensile and shear forces and solving the problem of easy loosening of traditional connecting boxes.

[0025] 4. This utility model is applicable to the connection of slabs in various prefabricated reinforced concrete structures, and is especially suitable for construction engineering fields with high requirements for processing efficiency, connection strength and cost control. Attached Figure Description

[0026] Figure 1 This is a structural schematic diagram of a connection box suitable for connecting reinforced concrete slabs according to this utility model;

[0027] Figure 2 This is a schematic diagram of a connection structure applicable to the connection of reinforced concrete slabs according to this utility model;

[0028] Figure 3 This is a schematic diagram of a second type of connection structure applicable to the connection of reinforced concrete slabs according to this utility model;

[0029] Figure 4 This is a top view of a third type of connection structure applicable to the connection of reinforced concrete slabs according to this utility model;

[0030] Figure 5 yes Figure 4 Left view of the connection structure shown.

[0031] In the diagram, 10 is the box structure; 11 is the first side plate; 12 is the second side plate; 13 is the third side plate; 14 is the bottom plate; 15 is the anchor bar; and 16 is the connecting hole.

[0032] 20. Wall panel; 21. Nut; 22. Bolt; 23. Washer;

[0033] 31. Sleeve; 32. Bolt. Detailed Implementation

[0034] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0035] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] like Figures 1 to 5As shown, the present invention provides a connecting box suitable for connecting reinforced concrete slabs, comprising: a box structure 10 with an opening formed by bending at least two steel plates, the box structure 10 including a side and a bottom connecting each side, the bottom being positioned opposite to the opening, wherein the side is a closed structure, and a connecting hole 16 is provided on one side of the side as a connection part when connecting two adjacent reinforced concrete slabs, when the connecting box is embedded in the reinforced concrete slab, the side where the connecting hole 16 is located is not higher than the surface of the reinforced concrete slab on the side where the box structure 10 is located. When there are two steel plates, the box structure 10 includes a first steel plate and a second steel plate. The first steel plate is U-shaped and the second steel plate is L-shaped. The two sides of the open end and the closed end of the first steel plate are part of the side structure of the box structure 10. One end of the second steel plate is another part of the side structure of the box structure 10, and the other end of the second steel plate is the bottom of the box structure 10. The two sides of the open end serve as the first side plate 11 of the box structure 10, the closed end serves as the second side plate 12 of the box structure 10, one end of the second steel plate serves as the third side plate 13 of the box structure 10, and the other end of the second steel plate serves as the bottom plate 14 of the box structure 10.

[0037] This utility model provides a connecting box suitable for connecting reinforced concrete slabs. The box structure 10 is formed by bending and welding a first steel plate and a second steel plate together. Compared with the traditional multi-plate welding method, this reduces the number of welds, reduces welding stress concentration, and improves the overall structural integrity. The first side plate 11 and the second side plate 12 of the first steel plate bear the main load, while the third side plate 13 and the bottom plate 14 of the second steel plate form a closed box. The arc-shaped bend can disperse corner stress and improve the fatigue resistance of the structure.

[0038] Preferably, the first steel plate is integrally formed into two opposing first side plates 11 and a second side plate 12 connecting the two first side plates 11 by a bending forming process; the second steel plate is integrally formed into a third side plate 13 and a bottom plate 14 by the same process. This forming method creates a continuous structure between the side plates and the connecting parts, avoiding the discreteness of splicing multiple steel plates. It reduces cutting and splicing processes, reduces splicing errors, and stabilizes the mechanical properties of the bent parts, providing a good foundation for subsequent welding and assembly, and helping to improve the overall structural reliability.

[0039] It is worth mentioning that the thickness of the first steel plate in the connecting box is greater than that of the second steel plate. As the main load-bearing component, the first steel plate forms the first side plate 11 and the second side plate 12, which must withstand the load transmitted from the bolts and the restraining force of the concrete. The greater thickness ensures sufficient structural strength and rigidity. The third side plate 13 and the bottom plate 14, formed by the second steel plate, mainly serve to enclose the box and provide auxiliary connections; their relatively thinner thickness is sufficient to meet functional requirements. The advantage of this design lies in achieving a rational allocation of materials. While ensuring the overall structural load-bearing capacity, it reduces the amount of the first steel plate used, lowers material costs, and reduces the weight of the connecting box, facilitating processing, transportation, and pre-embedded construction.

[0040] It is worth mentioning that the connection points between the two first side plates 11 and the second side plate 12 of the first steel plate are both arc-shaped bends formed by bending, and the connection point between the third side plate 13 and the bottom plate 14 of the second steel plate is also an arc-shaped bend. These arc-shaped bends replace the traditional right-angle splicing, creating a smooth transition at the bends of the steel plates. Their advantage lies in effectively dispersing stress, avoiding the risk of cracking due to stress concentration at right-angle locations, and improving the fatigue resistance of the structure.

[0041] Preferably, the connecting hole 16 on the second side plate 12 of the first steel plate is an enlarged circular hole structure, with a diameter larger than the outer diameter of the bolt 22 to be connected. This structure, by reserving a certain gap space, accommodates positioning deviations during the construction of the precast wall panel 20. During actual installation, even if the position of the pre-embedded bolt 22 deviates slightly, it can still be smoothly inserted into the connecting hole 16. The advantage of this design is that it reduces the requirements for the precision of the pre-embedded construction, reduces rework caused by positioning errors, and improves construction efficiency. At the same time, the reasonable gap size avoids additional stress during bolt 22 installation, ensures uniform stress distribution in the bolt connection, and enhances the stability of the overall connection structure.

[0042] This utility model also provides a connection structure suitable for bolted connections of reinforced concrete slabs. The connection structure includes the aforementioned connection box, which is pre-embedded in one of the adjacent reinforced concrete slabs when they are connected. The side of the connection box with the connection hole is flush with the side wall of the reinforced concrete slab. The opening of the connection box faces outward and is in an exposed state. The connector, in this example, is a bolt 22, one end of which is pre-embedded in the other of the adjacent reinforced concrete slabs when they are connected, and the other end is exposed. When the two adjacent reinforced concrete slabs are connected, the exposed end of the connector is inserted into the connection hole 16 of the connection box, and the connection between the bolt 22 and the connection box is locked by a nut 21. During structural assembly, a connecting box is pre-embedded in one wall panel 20, and a bolt 22 is pre-embedded at a corresponding position in the other wall panel 20. After the two wall panels 20 are in place, the pre-embedded bolts 22 are inserted into the bolt holes of the connecting box, and then locked by the threaded connection between the bolts 22 and the nuts 21. Two washers 23 are provided on the bolts 22, located between the nuts 21 and the connecting box, with the washer 23 having a larger contact area with the side wall of the connecting box. This pre-embedded wall panel 20 connection structure simplifies the connection process and effectively shortens construction time. The fit between the bolts 22 and the nuts 21 ensures connection strength, while the washers 23 distribute the pressure of the nuts 21 on the connecting box, preventing excessive local stress and deformation of the connecting box.

[0043] Preferably, when the connector is inserted into the connector box through the connector hole 16, there is a gap between the end face with the external thread and the opposite side of the connector box with the connector hole, so as to reserve space for the nut 21 to be fitted into the bolt 22.

[0044] Preferably, the bolts 22 embedded in the wall panel 20 are curved on one side of the wall, specifically a bent or hook-shaped structure facing inwards towards the wall panel 20. This curved design increases the contact area and mechanical interlocking force between the bolts 22 and the concrete wall panel 20, altering the force transmission path of the bolts 22 under stress. Compared to straight bolts 22, curved bolts 22 can more effectively resist tensile forces, reduce the risk of bolts 22 being pulled out of the wall panel 20, improve the anchoring reliability of the connection between the bolts 22 and the wall panel 20, and ensure more stable load transfer.

[0045] Preferably, anchor bars 15 are provided within the reinforced concrete slab containing the connecting box, and these anchor bars 15 are abutted against the first side plate 11 of the connecting box and fixed by welding. There are four anchor bars 15, located in pairs on both sides of the connecting box, and the length directions of the four anchor bars 15 are parallel to each other. Two of the anchor bars 15 are welded to the upper side of the connecting box, improving the anchoring reliability of the connection between the connecting box and the wall panel 20 and ensuring more stable load transfer.

[0046] Preferably, the side where the connecting hole 16 is located is not higher than the surface of the reinforced concrete slab on the side where the box structure 10 is located, so as to avoid the connecting box protruding from the wall. This ensures the flatness of the wall panel 20, reduces the leveling process during subsequent decoration, and avoids damage caused by the box protruding.

[0047] It's worth noting that different connectors can be selected depending on the wall type. For example, when the wall panel to be connected is relatively large (20mm),... Figure 3 As shown, this solution uses a sleeve 31 instead of a non-standard bolt to connect to the connecting box. The sleeve 31 has an internal thread on one end facing the connecting box, and two anchor bars 15 are connected to the other end. The two anchor bars 15 are located on both sides of the sleeve 31, arranged in a figure-eight pattern. The nut is replaced with a bolt 32 with a nut that fits the sleeve 31. In this structure, the sleeve 31 acts as an intermediate connector; its internally threaded end can stably engage with the bolt 32 to achieve a tight connection with the connecting box. The figure-eight-shaped anchor bars 15 increase the contact area and mechanical interlocking force with the concrete of the wall panel 20, dispersing the load transmitted by the wall panel 20. Its advantages are that, compared to a single bolt, the combination of the sleeve 31 and the figure-eight-shaped anchor bars 15 can withstand greater tensile and shear forces, adapting to the connection requirements of larger wall panels 20, improving the overall load-bearing capacity of the connection structure, and the figure-eight design makes the anchoring more uniform, reducing local stress concentration and enhancing the stability and reliability of the connection.

[0048] Preferably, when the two wall panels 20 are perpendicular to each other, such as Figure 4 As shown, the connecting box is pre-embedded in the horizontal wall panel 20. Two anchor bars 15, connected to the sleeve 31, are inserted into the sleeve 31 horizontally, and the two anchor bars 15 are parallel to the vertical wall panel 20. In this structure, the space at the junction of the horizontal and vertical wall panels is limited. The arrangement of the anchor bars 15, inserted horizontally into the sleeve 31 and parallel to the vertical wall panel 20, can adapt to the narrow space. If the anchor bars 15 connected to the sleeve 31 were distributed in other ways, they would easily conflict with the steel bars in the vertical wall panel. The anchor bars 15, arranged horizontally and parallel to the vertical wall panel, can reduce the space occupation and avoid interference with the surrounding structure. At the same time, this arrangement can still transfer the load through the bond force with the concrete in the limited space, ensuring the anchoring effect of the vertical connection. Under the spatial constraints, it achieves a balance between structural stability and installation feasibility, and meets the diverse needs of wall panel connections at different angles.

[0049] Preferably, the connecting box structure 10 is formed by bending and welding a first steel plate and a second steel plate together. The first steel plate forms the first side plate 11 and the second side plate 12, which bear the load. The second steel plate forms the third side plate 13 and the bottom plate 14. The arc-shaped bend optimizes the stress on the corners, and the enlarged circular connecting hole 16 accommodates installation deviations. The connecting structure uses a pre-embedded connecting box and pre-embedded bolts 22, which are locked by nuts 21 and washers 23. The bent bolts 22 enhance the anchoring, and the opening of the connecting box is flush with the wall surface. This solution reduces the weld seams and stress concentration of traditional multi-plate welding, reduces costs by allocating materials as needed, and improves the anchoring reliability of the connecting box and anchor bars 15. The synergy of various structural details achieves the comprehensive advantages of convenient processing, stable stress, and efficient construction, and is suitable for the connection requirements of prefabricated assembled structures.

[0050] It should be noted that in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly defined. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0051] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0052] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A connection box suitable for connecting reinforced concrete slabs, characterized in that, include: A box structure with an opening is formed by bending at least two steel plates. The box structure includes a side and a bottom connecting the sides, with the bottom positioned opposite to the opening. The side is a closed structure, and a connecting hole is provided on one side of the side as a connection point when two adjacent reinforced concrete slabs are connected. When the connecting box is embedded in the reinforced concrete slab, the side with the connecting hole is not higher than the surface of the reinforced concrete slab on the side where the box structure is located.

2. The connection box for connecting reinforced concrete slabs according to claim 1, characterized in that, When there are two steel plates, the box structure includes a first steel plate and a second steel plate. The first steel plate is U-shaped and the second steel plate is L-shaped. The two sides of the open end and the closed end of the first steel plate are part of the side structure of the box structure. One end of the second steel plate is another part of the side structure of the box structure, and the other end of the second steel plate is the bottom of the box structure. The two sides of the open end serve as the first side plate of the box structure, the closed end serves as the second side plate of the box structure, one end of the second steel plate serves as the third side plate of the box structure, and the other end of the second steel plate serves as the bottom plate of the box structure.

3. The connection box for connecting reinforced concrete slabs according to claim 2, characterized in that, The thickness of the first steel plate at the open end is equal to the thickness of the closed end, and the thickness of the second steel plate at both ends is equal, wherein the thickness of the first steel plate is greater than the thickness of the second steel plate.

4. The connection box for connecting reinforced concrete slabs according to claim 2, characterized in that, The first and second steel plates are bent to form U-shaped and L-shaped structures respectively. The first side plate and the second side plate are connected by an arc-shaped bend, and the third side plate and the bottom plate are connected by an arc-shaped bend.

5. The connection box for connecting reinforced concrete slabs according to claim 2, characterized in that, The connecting hole is located on the second side plate, and the diameter of the connecting hole is larger than the outer diameter of the connector to be connected.

6. A connection structure suitable for connecting reinforced concrete slabs, characterized in that, include: The connecting box according to any one of claims 1 to 5, wherein the connecting box is pre-embedded in one of the two adjacent reinforced concrete slabs when they are connected, and the side of the connecting box with the connecting hole is flush with the side wall of the reinforced concrete slab, wherein the opening of the connecting box faces outward and is in an exposed state. The connector has one end embedded in the other of two adjacent reinforced concrete slabs when they are connected, and the other end is exposed. When two adjacent reinforced concrete slabs are connected, the exposed end of the connector is inserted into the connection hole of the connection box, and the connection between the connector and the connection box is locked by fasteners.

7. The connection structure applicable to reinforced concrete slab connections according to claim 6, characterized in that, The connector has an external thread at one end that connects to the connector box. When the connector is inserted into the connector box through the connector hole, there is a gap between the end face with the external thread and the opposite side of the connector box with the connector hole.

8. The connection structure applicable to reinforced concrete slab connections according to claim 6, characterized in that, One end of the connector located inside the reinforced concrete slab is bent, either by bending towards the inside of the corresponding reinforced concrete slab or by being hook-shaped.

9. The connection structure applicable to reinforced concrete slab connections according to claim 6, characterized in that, At least one anchor bar is provided in the reinforced concrete slab where the connecting box is located, and the anchor bar is attached to the side of the connecting box and fixed by welding.

10. The connection structure applicable to reinforced concrete slab connections according to claim 9, characterized in that, There are four anchor bars, located on both sides of the connecting box, and the length directions of the four anchor bars are parallel to each other. The four anchor bars are welded and fixed to the upper side of the connecting box.

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