Prefabricated building beam-column joint high-strength connecting structure

Abstract

This paper discloses a high-strength connection structure for beam-column joints in prefabricated buildings, including a beam-column joint with a hollow octagonal cross-section. I-beams can be installed on the short sides of the beam-column joint, and fixing buckles are installed on adjacent short sides. The fixing buckle has a hollow groove in the middle, with its first inclined surface connecting to the second and third short straight sides. Upper and lower mounting plates are provided at the top and bottom of the straight sides. The upper mounting plate has through holes and is connected to the I-beams via fixing bolts. Triangular reinforcing ribs are provided on the lower surface of the upper mounting plate, and the lower mounting plate transitions to the main body with a rounded arc. This structure replaces welding with bolted connections, shortening the construction period, increasing strength, ensuring structural stability, and facilitating installation.

Description

Technical Field

[0001] This article relates to a high-strength connection structure for beam-column joints in prefabricated buildings. Background Technology

[0002] Prefabricated buildings are widely used in rural old house renovation and other scenarios due to their advantages such as fast installation speed, short construction period, and high structural strength. However, in the existing beam-column joint installation design of prefabricated buildings, welding is mostly used to achieve beam-column connection.

[0003] This welding connection method has obvious drawbacks. On the one hand, it requires a large number of welding workers, which increases labor costs; on the other hand, it is difficult to effectively guarantee the welding strength, which can easily affect the stability and reliability of the building structure.

[0004] Furthermore, welding is a complex construction process, highly susceptible to environmental factors, and inefficient, failing to meet the demands of rapid construction in modern buildings. Therefore, there is an urgent need for a more efficient and reliable prefabricated beam-column joint connection structure to replace welding, addressing the problems of low construction efficiency and unstable structural strength in existing technologies. Utility Model Content

[0005] This paper aims to provide a high-strength connection structure for beam-column joints in prefabricated buildings. Addressing the problems of low construction efficiency and poor strength reliability inherent in existing welded connections for beam-column joints in prefabricated buildings, this paper presents a high-strength connection structure centered on bolt connections. Through structural optimization, it achieves weld-free assembly, improving connection strength and construction efficiency. The specific solution is as follows:

[0006] A high-strength connection structure for beam-column joints in prefabricated buildings includes a beam-column joint with a hollow octagonal cross-section. I-beams can be installed on any short side of the beam-column joint, and fixing buckles are provided on the two adjacent short sides of the short side where the I-beams are installed.

[0007] The beam-column joint can be cold-formed from Q355B steel, with an outer profile side length of 150-200mm, a wall thickness of 8-12mm, and a hollow cavity diameter accounting for 60%-70% of the cross-sectional side length. This reduces weight by 30% while forming a uniform lateral force resisting system through the eight sides of the octagon, capable of withstanding bending moments and shear forces from any direction. Any short side can serve as an I-beam installation interface, increasing the degree of freedom in installation direction by four times compared to traditional rectangular joints. It is suitable for various joint connection scenarios such as cross-shaped and T-shaped joints.

[0008] The fixing buckle includes a main body, the main body has a hollow groove in the middle, the main body includes a first inclined surface and a second short straight edge and a third short straight edge connected to both ends of the first inclined surface, the second short straight edge and the third short straight edge extend into the interior of the I-shaped steel, the top of the second short straight edge and the third short straight edge are provided with an upper mounting plate, and the bottom of the second short straight edge and the third short straight edge are provided with a lower mounting plate.

[0009] Both the upper and lower mounting plates are provided with through holes, and the corresponding positions of the I-shaped steel are provided with corresponding through holes. The fixing buckle is connected to the I-shaped steel to be fixed by fixing bolts. The fixing bolts pass through the through holes and through holes in sequence and are then connected to the nuts.

[0010] To further enhance the load-bearing capacity of the upper mounting plate, a reinforcing rib is provided on the lower surface of the upper mounting plate, and the reinforcing rib is triangular in shape; the lower mounting plate is connected to the main body by a rounded transition. At the same time, since the lower mounting plate is subjected to less stress, it can be connected using only a rounded transition, which saves raw materials and facilitates welding operations during pre-assembly.

[0011] To improve the fixing effect between the fixing buckle and the beam-column joint, the fixing buckle has several first through holes in its middle, which are vertically distributed; the upper mounting plate has several second through holes, and the lower mounting plate has several third through holes. Under normal installation conditions, there are four first and four second through holes, and the number of third through holes is half the number of second through holes.

[0012] The beam-column joint is connected by four vertically distributed first through holes, with more through holes at the top and fewer at the bottom. This design fits the stress characteristics of I-beams and improves the reliability of the connection by balancing the stress through multiple bolts.

[0013] Furthermore, the upper and lower ends of the beam-column joint are connected to the beam and column, and the beam and column have embedded protrusions inside that match the cross-section of the beam-column joint. At the connection points between the upper and lower ends of the beam-column joint and the beam and column, a flange with a width of 20-30mm is provided on the outer wall of the joint, corresponding to a prefabricated octagonal annular protrusion on the inner wall of the beam and column. The inner diameter of the protrusion and the outer diameter of the joint are fitted with a clearance fit. This structure achieves initial positioning through an interference fit, and with subsequent welding, increases the connection stiffness between the joint and the beam and column by 40%, while avoiding the alignment deviation problems encountered in traditional welding.

[0014] Furthermore, the surface of the main body is provided with a waist-shaped groove, the position of which matches the position of the first through hole. The design of the waist-shaped groove facilitates the quick installation of the fixing buckle and the beam-column joint.

[0015] Furthermore, the two right-angled sides of the reinforcing rib are welded and fixed to the upper mounting plate and the main body, respectively. Alternatively, the supporting capacity of the reinforcing rib can be further enhanced by embedding the two right-angled sides of the reinforcing rib into the interior of the upper mounting plate and the main body, respectively.

[0016] Installation steps:

[0017] S1. Preparation for fixing buckle installation: Select the corresponding number of fixing buckles according to the connection position of the beam-column joint and the I-beam. Check whether the first through hole, second through hole and third through hole on the fixing buckle are intact. Confirm the specifications and quantity of high-strength bolts, nuts and anti-loosening washers.

[0018] S2. Preliminary positioning of the fixing buckle: Install the fixing buckle on the adjacent short side of the I-shaped steel to be connected at the beam-column node. Use high-strength bolts to pass through the first through hole in the middle of the fixing buckle to initially fix it to the beam-column node, ensuring that the fixing buckle is in an accurate position.

[0019] S3. Fine adjustment of levelness: Use a level measuring tool to adjust the levelness of the upper mounting plate of the fixing buckle. By fine-tuning the position of the fixing buckle on the beam-column node or the tightness of the bolts, the level height error of the upper mounting plate is controlled within the allowable range.

[0020] S4. Beam-column and node connection: Insert the upper and lower ends of the beam and column into the beam-column node, so that the embedded protrusion inside the beam and column fits tightly with the cross section of the beam-column node. Then, use welding to fix the connection between the beam and column and the beam-column node to ensure a firm connection.

[0021] S5. Installation and fixing of I-beams: Place the I-beams on the upper mounting plate of the fixing buckle, adjust the position of the I-beams to fit against the upper mounting plate, first insert high-strength bolts through the second through hole of the upper mounting plate, connect them with the corresponding through holes of the I-beams and tighten the nuts; then insert high-strength bolts through the third through hole of the lower mounting plate, connect them with the corresponding through holes of the I-beams and tighten the nuts, thus completing the high-strength connection between the I-beams and the beam-column joint.

[0022] When the I-beam is subjected to a vertical load, the load is transferred to the main body of the fixing buckle through the second through-hole bolt of the upper mounting plate, and then distributed to the octagonal section of the beam-column joint via the first inclined surface. The horizontal load is transferred to the joint through the embedded contact between the second and third short straight sides of the fixing buckle and the I-beam, and then to the beam-column joint via the embedded protrusion. Under load, the fixing buckle is allowed to undergo slight elastic deformation to avoid stress concentration, while the triangular reinforcing ribs suppress the bending deformation of the upper mounting plate.

[0023] Beneficial effects:

[0024] This utility model adopts a beam-column joint structure with a hollow octagonal cross section. By utilizing the geometric symmetry of the octagon and the hollow cavity design, the self-weight of the components is reduced while forming a multi-directional installation system. I-beams can be installed from any short side, which significantly improves the flexibility and spatial adaptability of the joint connection.

[0025] The fixing buckle, through the combination structure of the first inclined surface and the second and third short straight edges, allows the second and third short straight edges to penetrate deep into the I-shaped steel to form an embedded support. Combined with the bolt connection design of the upper and lower mounting plates, the traditional rigid connection of welding is transformed into a detachable bolt mechanical connection. This not only avoids the problem of welding stress concentration, but also provides the vertical support force required by the I-shaped steel directly through the bolt preload, thereby improving the connection strength.

[0026] This structure replaces welding with bolted connections, enabling standardized prefabrication of components and rapid on-site assembly, which can shorten the construction period. At the same time, the design of the hollow groove and bolt holes allows for ±2mm installation error adjustment, effectively reducing the on-site assembly accuracy requirements and combining construction efficiency with structural reliability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the connection at the beam-column joint of a prefabricated building.

[0028] Figure 2 This is an exploded view illustrating the connection at the beam-column joint of a prefabricated building.

[0029] Figure 3 This is an installation diagram at a single beam-column joint location;

[0030] Figure 4 This is a top view of a single beam-column joint;

[0031] Figure 5 This is a structural diagram of a single fastener;

[0032] Figure 6 This is a top view of a single fastener;

[0033] In the diagram: 1. I-beam, 2. Beam-column joint, 3. Beam-column, 4. Fixing buckle, 41. Main body, 42. Hollow groove, 43. Waist-shaped groove, 44. First through hole, 45. Upper mounting plate, 46. Reinforcing rib, 47. Lower mounting plate. Detailed Implementation

[0034] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0035] Example 1

[0036] like Figures 1 to 6As shown, the prefabricated building beam-column joint high-strength connection structure of this embodiment includes a beam-column joint 2, the cross-section of which is a hollow octagon. An I-beam 1 is installed on the short side of the beam-column joint 2, and a fixing buckle 4 is provided on adjacent short sides. The main body 41 of the fixing buckle 4 has a hollow groove 42 in the middle. The main body 41 is composed of a first inclined surface, a second short straight side, and a third short straight side. The second and third short straight sides extend into the interior of the I-beam 1, and an upper mounting plate 45 and a lower mounting plate 47 are respectively provided at its top and bottom.

[0037] The lower surface of the upper mounting plate 45 is provided with triangular reinforcing ribs 46, and the lower mounting plate 47 is connected to the main body 41 by an arc transition. The fixing buckle 4 has four vertically distributed first through holes 44 in the middle, the upper mounting plate 45 has four second through holes, and the lower mounting plate 47 has two third through holes. The beam-column 3 has an embedded protrusion inside that matches the cross-section of the beam-column node 2, which facilitates the connection between the beam-column 3 and the beam-column node 2.

[0038] The installation process includes the following steps:

[0039] S1. Select an appropriate number of fixing buckles 4, and use high-strength bolts to pass through the first through hole 44 in the middle of the fixing buckle 4, and install it on the adjacent short side of the short side of the I-shaped steel 1 that needs to be connected to the beam-column node 2 and fix it initially.

[0040] S2. Use a level measuring tool to adjust the level of the upper mounting plate 45 of the fixing buckle 4 to ensure that its height error is within the allowable range.

[0041] S3. Insert the upper and lower ends of beam-column 3 into beam-column node 2, so that the embedded protrusion inside beam-column 3 matches the cross section of beam-column node 2, and then weld and fix beam-column 3 and beam-column node 2.

[0042] S4. Place the I-beam 1 on the upper mounting plate 45. Through the second through hole of the upper mounting plate 45 and the third through hole of the lower mounting plate 47, use fixing bolts to pass through the through holes in sequence and the corresponding through holes of the I-beam 1. Tighten the nuts to complete the connection.

[0043] This structure employs a hollow octagonal beam-column joint, allowing I-beams to be installed from any short side. A fixing clip structure extends deep into the I-beam, and high-strength fixing to the joint is achieved through bolted connections between the upper and lower mounting plates. This design avoids the defects of traditional welding, offering not only convenient installation and high construction efficiency but also reliable support through bolted connections, enhancing the connection strength and structural stability of beam-column joints in prefabricated buildings.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fabricated building beam-column joint high-strength connecting structure, characterized in that, It includes beam-column joints, the cross-sectional shape of which is an octagonal hollow structure; I-beams can be installed on any short side of the beam-column joint, and fixing buckles are provided on the two adjacent short sides of the short side where the I-beams are installed. The fixing buckle includes a main body, the main body has a hollow groove in the middle, the main body includes a first inclined surface and a second short straight edge and a third short straight edge connected to both ends of the first inclined surface, the second short straight edge and the third short straight edge extend into the interior of the I-shaped steel, the top of the second short straight edge and the third short straight edge are provided with an upper mounting plate, and the bottom of the second short straight edge and the third short straight edge are provided with a lower mounting plate. Both the upper and lower mounting plates are provided with through holes, and the corresponding positions of the I-shaped steel are provided with corresponding through holes. The fixing buckle is connected to the I-shaped steel to be fixed by fixing bolts. The fixing bolts pass through the through holes and through holes in sequence and are then connected to the nuts.

2. The prefabricated building beam-column joint high-strength connecting structure according to claim 1, characterized in that, The lower surface of the upper mounting plate is provided with reinforcing ribs, and the reinforcing ribs are triangular in shape; the lower mounting plate is connected to the main body by an arc transition.

3. The prefabricated building beam-column joint high-strength connecting structure according to claim 2, characterized in that, The fixing buckle has several first through holes in the middle, and the several first through holes are vertically distributed; The upper mounting plate has several second through holes, and the lower mounting plate has several third through holes.

4. The prefabricated building beam-column joint high-strength connecting structure according to claim 3, characterized in that, The number of the first and second through holes is 4 each, and the number of the third through hole is half the number of the second through holes.

5. The prefabricated building beam-column joint high-strength connecting structure according to claim 3, characterized in that, The upper and lower ends of the beam-column joint are connected to the beam and column, and the interior of the beam and column is provided with an embedded protrusion that matches the cross-section of the beam-column joint.

6. The prefabricated building beam-column joint high-strength connecting structure according to claim 3, characterized in that, The surface of the main body is provided with a waist-shaped groove, and the position of the waist-shaped groove matches the position of the first through hole.

7. The prefabricated building beam-column joint high-strength connecting structure according to any one of claims 3-6, characterized in that, The two right-angled sides of the reinforcing rib are welded and fixed to the upper mounting plate and the main body, respectively.

8. The prefabricated building beam-column joint high-strength connecting structure according to any one of claims 3-6, characterized in that, The two right-angled sides of the reinforcing rib are embedded in the upper mounting plate and the interior of the main body, respectively.

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