A π-shaped steel member-concrete composite beam

Abstract

The utility model discloses a kind of π-shaped steel member-concrete composite beam, including at least two π-shaped steel members;The π-shaped steel member includes flange plate and two webs, two webs are located flange plate same side surface, web and flange plate are perpendicular to each other, and the side of web is fixedly connected with flange plate, so that flange plate and two webs form the steel member with section π type;Two π-shaped steel members are oppositely and parallelly arranged, so that the web on two π-shaped steel members is towards opposite side;Multiple connecting steels are provided between two π-shaped steel members, and the connecting steel is located on the side where two webs of π-shaped steel member are away from each other;The connecting steel is fixedly connected with the outer side surface of one web away from another web on two π-shaped steel members respectively;Concrete structure layer covering connecting steel and all webs is poured between two π-shaped steel members.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, specifically to a π-shaped steel component-concrete composite beam. Background Technology

[0002] Partially encased steel-concrete composite beams are an improvement on H-beams. Stirrups or shear studs are welded within the web height of the H-beam, and then concrete is poured to fill both sides of the H-beam, flush with the flanges, forming a shared load-bearing member. Compared to H-beams, they offer better corrosion resistance and fire resistance, and their load-bearing capacity, stiffness, buckling resistance, and torsional resistance are all enhanced. However, currently, PEC beams (… Figure 5 The main drawbacks are as follows: First, hot-rolled or welded H-beams are used, which have thicker flanges and webs, resulting in poor economic efficiency. Second, in order to achieve a good combination of steel and concrete, a large number of stirrups and studs need to be welded onto the steel beams, making the structure complex. Third, the web of the H-beam separates the concrete, requiring the concrete to be poured from the other side, resulting in low production efficiency. Even if the steel web is perforated to allow the concrete to be poured in one go, it is difficult to pour it densely.

[0003] To address the aforementioned issues, existing technologies have designed a hollow composite beam (such as...). Figure 6 As shown, the standard beam body mainly consists of flange steel plates, lap joint plates, truss angle steel or truss reinforcement and concrete. Because a portion of the web is omitted, its economic efficiency is improved, and due to the hollow web, the concrete can be poured in one go. However, there are still shortcomings. First, the structure is unreasonable; the truss angle steel is arranged diagonally with large spacing, resulting in poor control over concrete crack development. Second, the production process is complex or difficult; the truss angle steel is in loose parts, in large quantities, and assembly and positioning are time-consuming, making automated production inconvenient. The truss reinforcement is arranged on the same side as the lap joint plate, leading to collision problems and increasing production difficulty. The lap joint plate, as an independent component, needs to be welded not only to the truss angle steel / reinforcement but also to the flange steel plates, resulting in a large amount of welding work. Third, the economic efficiency can be further improved. For standardized production, the thickness of the upper and lower flange steel plates of this type of beam is generally the same. According to the bending principle of double-reinforced concrete beam sections, the tension steel should be greater than the compression steel to fully utilize the material; currently, this form cannot fully utilize the material in the compression zone. Utility Model Content

[0004] In view of the above-mentioned shortcomings of the existing technology, the purpose of this utility model is to provide a π-shaped steel component-concrete composite beam to solve the problems of insufficient economy, production efficiency and load-bearing performance in the existing technology.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: A π-shaped steel member-concrete composite beam includes at least two π-shaped steel members; each π-shaped steel member includes a flange and two webs, the two webs being located on the same side surface of the flange, the webs being perpendicular to the flange, and one side of the webs being fixedly connected to the flange, so that the flange and the two webs form a steel member with a π-shaped cross-section; the two π-shaped steel members are arranged opposite to each other and parallel, with the webs of the two π-shaped steel members facing opposite sides; a plurality of connecting reinforcing bars are provided between the two π-shaped steel members, the connecting reinforcing bars being located on the opposite side of the two webs of the π-shaped steel members; the connecting reinforcing bars are fixedly connected to the outer surface of one web of the two π-shaped steel members that is opposite to the other web; a concrete structural layer covering the connecting reinforcing bars and all the webs is poured between the two π-shaped steel members.

[0006] Preferably, the flange is composed of a first flange and a second flange, both of which are arranged in a horizontal direction, and one side edge of the first flange is fixedly connected to one side edge of the second flange; the two webs are fixedly connected to the first flange and the second flange respectively.

[0007] Preferably, the connecting steel bar is a corrugated steel bar with multiple crests and troughs, and the crests and troughs have straight segments, through which the connecting steel bar is fixedly connected to the web of the π-shaped steel member.

[0008] Preferably, two connecting plates are provided between the two π-shaped steel members. The connecting plates are located at one end of the π-shaped steel member along its length direction, and the connecting plates are perpendicular to the flange plates. The two sides of the connecting plates along their length direction are respectively fixedly connected to the opposite side surfaces of the flange plates of the two π-shaped steel members.

[0009] Preferably, the connecting plate is provided with multiple connecting holes for connecting beam-column joints or primary and secondary beam joints.

[0010] Preferably, a plurality of web reinforcement bars are provided on one side of the connecting reinforcement bars. The web reinforcement bars are located on the inner or outer side of the connecting reinforcement bars and are fixedly connected to the connecting reinforcement bars.

[0011] Preferably, multiple bottom reinforcement bars are laid at the bottom of the composite beam, the bottom reinforcement bars are distributed at intervals along the width direction of the flange plate, and the length direction of the bottom reinforcement bars is consistent with the length direction of the flange plate.

[0012] Compared with the prior art, the present invention has the following advantages: 1. The π-shaped steel component designed in this utility model simplifies processing and improves structural reliability. Combined with corrugated connecting steel bars, it optimizes production assembly and strengthens synergistic stress distribution. The composite beam described in this utility model can be continuously produced using automated equipment, significantly improving production efficiency and reducing labor costs. Because the steel bars are continuously formed, there is no need to repeatedly adjust individual parts during assembly and positioning, avoiding the problems of repeated assembly and positioning of truss angle steel parts and same-side production, thus simplifying the assembly process. Furthermore, the corrugated crests, troughs, and web are fixed by straight sections, enabling a firm fit with the concrete structural layer, enhancing the synergistic stress distribution of steel and concrete, and improving bond reliability.

[0013] 2. In this utility model, the concrete structural layer achieves complementary advantages between steel and concrete and protects the steel components. The concrete structural layer covers the entire web and connecting reinforcement, forming a combined stress system of steel under tension and concrete under compression. This fully utilizes the tensile strength of steel and the compressive strength of concrete, significantly improving the overall load-bearing capacity of the composite beam. At the same time, the concrete covering can isolate the external environment, prevent the steel components from corroding, and extend the service life of the composite beam.

[0014] 3. In this utility model, the connecting plate enhances lateral connection and overall stability. The connecting plate, located at one end of the π-shaped steel member along its length, is perpendicular to the flange plate and fixed to both sides. This strengthens the lateral connection between the two π-shaped steel members, preventing relative displacement under stress and ensuring the integrity of the steel frame. When the hole at the other end of the connecting plate is covered with concrete, the concrete passes through the hole, forming a key effect, further enhancing the bond strength between the connecting plate and the concrete and strengthening the composite effect. The bottom reinforcement bars, spaced along the width of the flange plate at intervals, extend along the same length as the flange plate. This specifically enhances the tensile strength of the beam's tension zone (bottom), working in conjunction with the π-shaped steel flange to bear the tensile force and prevent failure due to insufficient tensile strength. Furthermore, the spaced distribution of the bottom reinforcement bars ensures uniform force transmission, improving the overall structural reliability of the composite beam.

[0015] 4. This utility model allows for flexible arrangement of longitudinal reinforcement or prestressed tendons in the tension zone of the beam according to actual stress requirements, giving full play to the advantages of material performance, avoiding material waste caused by over-design, and significantly improving economy; at the same time, this design facilitates the standardization of component specifications and construction process, promotes standardized production, reduces construction costs and shortens the construction cycle. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of the π-shaped steel component-concrete composite beam described in this utility model.

[0017] Figure 2 This is a structural schematic diagram of an embodiment of a π-shaped steel component according to the present invention.

[0018] Figure 3 This is a structural schematic diagram of another embodiment of the π-shaped steel component in this utility model.

[0019] Figure 4 This is a schematic diagram of the workbench used in this utility model for processing the π-shaped steel component-concrete composite beam.

[0020] Figure 5 This is a schematic diagram of a prior art structure.

[0021] Figure 6 This is a schematic diagram of another existing technology.

[0022] In the diagram: 1. Flange plate; 2. Web plate; 3. Connecting reinforcement; 4. First flange plate; 5. Second flange plate; 6. Straight section; 7. Connecting plate; 8. Connecting hole; 9. Web reinforcement; 10. Bottom reinforcement; 11. End plate; 12. Upper fixed platform; 13. Lower fixed platform; 14. Lifting device; 1' Open section main steel member; 2' Concrete covering; 3' Stirrups; 4' Longitudinal reinforcement; 5' Connecting rod; 6' Shear member; 1" Truss angle steel; 2" Lapping plate; 3" Flange steel plate; 4" Concrete". Detailed Implementation

[0023] This utility model will be clearly and completely described with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on this utility model are within the protection scope of this utility model.

[0024] This utility model provides a π-shaped steel component-concrete composite beam, such as Figure 1-3 As shown, it includes at least two π-shaped steel members; each π-shaped steel member includes a flange plate 1 and two web plates 2, the two web plates are located on the same side surface of the flange plate, the web plates are perpendicular to each other and one side of the web plates are fixedly connected to the flange plate, so that the flange plate and the two web plates form a steel member with a π-shaped cross section; the two π-shaped steel members are arranged opposite to each other and parallel to each other, so that the web plates on the two π-shaped steel members face opposite sides; a plurality of connecting steel bars 3 are provided between the two π-shaped steel members, the connecting steel bars are located on the side of the two web plates on the π-shaped steel members that are opposite to each other; the connecting steel bars are fixedly connected to the outer surface of one web plate on the two π-shaped steel members that is opposite to the other web plate; a concrete structural layer covering the connecting steel bars and all the web plates is poured between the two π-shaped steel members.

[0025] To address the technical problems of existing technologies, the inventors previously designed a steel-concrete composite beam with reinforcing bars. This composite beam directly welded the reinforcing bars to two parallel steel plates, maximizing material savings. However, in practical applications, it was found to have shortcomings in terms of load-bearing performance and manufacturing process. Firstly, the load-bearing performance is weakened. The direct welding of the reinforcing bars to the thin steel plates results in the reinforcing bars having multiple functions coupled as a shear connector, shear stirrup, and restraining steel plate, leading to complex stress in the connection area and a tendency for brittle failure to occur first at the weld, thus reducing the component's load-bearing capacity and ductility. Secondly, it places high demands on the manufacturing process. Because the flanges are flat steel plates with poor out-of-plane stiffness, welding with the reinforcing bars easily causes welding deformation, resulting in large torsional deformation of the component. Therefore, higher requirements are needed for the manufacturing process. For these reasons, this invention redesigns a π-shaped steel-concrete composite beam.

[0026] In some embodiments of this utility model, the π-shaped steel component can be implemented in two different ways. One method uses two standard hot-rolled T-shaped steels, with the specific structure as follows: Figure 2 As shown, the flange plate consists of a first flange plate 4 and a second flange plate 5. Both the first and second flange plates are arranged horizontally, and one edge of the first flange plate is fixedly connected to one edge of the second flange plate. Two web plates are fixedly connected to the first and second flange plates respectively, so that one web plate is combined with the first flange plate and the other web plate with the second flange plate to form a T-shaped steel structure. The web plate plays two roles: first, it enhances the load-bearing performance of the component. The web plate can act as a shear connector, transferring the shear force between the flange and the concrete interface, enhancing the combined effect, thereby enhancing the integrity of the component and improving its load-bearing capacity and deformation capacity. Second, it increases the out-of-plane stiffness of the flange plate, thereby reducing out-of-plane deformation during manufacturing. These two T-shaped steel structures are then combined and butt-welded to form a π-shaped steel component with a π-shaped cross-section. This design reduces the welding between the stiffening plates and flange plates in existing technologies, significantly improving production efficiency, while also reducing the deformation caused by extensive welding between the flange and web plates in the original structure. Another method is to directly use a hot-rolling process to directly prepare the π-shaped steel component, such as... Figure 3 As shown. In this method, the flange and two webs are integrally formed by hot rolling, further improving production efficiency.

[0027] In some embodiments of this utility model, the connecting steel bar is a corrugated steel bar with multiple crests and troughs, and each crest and trough has a straight segment 6. The connecting steel bar is fixedly connected to the web of the π-shaped steel member through this straight segment. The crests and troughs of the corrugated steel bar can form a firm fit with the concrete structural layer, significantly enhancing the bonding reliability between steel and concrete and improving the cooperative stress-bearing capacity. The straight segment is fixed to the web, ensuring the connection stability between the connecting steel bar and the π-shaped steel member and preventing separation under stress. The corrugated steel bar can be continuously formed, eliminating the need for repeated adjustment and positioning of individual parts as required by existing truss angle steel / steel bars, simplifying the assembly process and facilitating automated production. In some embodiments of this utility model, a plurality of connecting plates 7 are provided between the two π-shaped steel members. The connecting plates are located at one end of the π-shaped steel member along its length, perpendicular to the flange plate, and their two sides along the length direction are fixedly connected to the opposite surfaces of the flange plates of the two π-shaped steel members. The connecting plates are arranged vertically, with their plane perpendicular to the flange plate plane, but parallel to the web plate plane. The connecting plates enhance lateral connection; being perpendicular to the flange plate and connecting the flange plates of the two π-shaped steel members, they strengthen the lateral connection between the two members, preventing relative displacement of the composite beam under stress and ensuring the integrity of the steel frame. Simultaneously, they adapt to the stress direction; the plane of the connecting plate is parallel to the web plate plane, matching the stress direction of the composite beam, further improving the overall structural stability.

[0028] In some embodiments of this utility model, a plurality of connection holes 8 are provided on the connecting plate. The connection holes are used for beam-column joints or primary and secondary beam joints, which facilitates the assembly of the composite beam with other structures. At the same time, after the concrete covers the connection hole at the other end of the web, the concrete can pass through the hole to form a pin-key effect, which significantly improves the bonding strength between the connecting plate and the concrete and further enhances the combined effect of steel and concrete.

[0029] In some embodiments of this utility model, a plurality of web reinforcement bars 9 are provided on one side of the connecting reinforcement bar. The web reinforcement bars are located inside or outside the connecting reinforcement bar and are fixedly connected to the connecting reinforcement bar. The web reinforcement bars are fixed to the connecting reinforcement bar to form a denser reinforcement skeleton, which can help restrain the concrete and enhance the control effect on the development of concrete cracks.

[0030] In some embodiments of this utility model, multiple bottom reinforcement bars 10 are laid at the bottom of the composite beam. These bottom reinforcement bars are spaced apart along the width direction of the flange plate, and their length direction is consistent with the length direction of the flange plate. The bottom reinforcement bars specifically enhance the tensile strength of the tension zone (bottom) of the composite beam, working in conjunction with the π-shaped steel flange to bear tensile forces. The configuration of the bottom reinforcement bars fully utilizes the material in the compression zone, further improving economic efficiency. Simultaneously, by adjusting the number of bottom reinforcement bars, different load requirements can be accommodated, achieving flexible production while meeting standardized production requirements.

[0031] In some embodiments of this utility model, two end plates 11 are located between two π-shaped steel members. The two end plates are situated at both ends along the length of the web reinforcement, and their upper and lower ends extend to the opposite surfaces of the two flange plates, respectively. The plane of the end plates is perpendicular to the plane of the connecting plate, allowing the ends of the web reinforcement to abut against the end plates.

[0032] This utility model also provides a workbench for processing the aforementioned π-shaped steel component-concrete composite beam, such as... Figure 4 As shown, the worktable includes an upper fixed platform 12 and a lower fixed platform 13. The upper fixed platform has an upper working surface, and the lower fixed platform has a lower working surface. The upper fixed platform is located above the lower fixed platform, and the upper working surface of the upper fixed platform is opposite to the lower working surface of the lower fixed platform. The upper fixed platform is connected to the lower fixed platform via a lifting device 14, which enables the upper fixed platform to move vertically up and down. The lifting device includes two hydraulic lifts, which are located at both ends of the lower fixed platform along its length. The bottom of the hydraulic lifts is fixed to the ground, and both ends of the upper fixed platform are positioned above the hydraulic lifts and fixedly connected to them. The hydraulic lifts can drive the upper fixed platform to move vertically up or down. In actual processing, a π-shaped steel component can be detachably fixed to the upper working surface of the upper fixed platform, with the web of the π-shaped steel component facing downwards. Then, another π-shaped steel component can be detachably fixed to the lower working surface of the lower fixed platform, with the web of the π-shaped steel component facing upwards. Subsequently, according to design requirements, the distance between the two π-shaped steel components was adjusted using a hydraulic lift, and then the upper fixed platform was fixed in the desired position using the same hydraulic lift. Next, connecting reinforcing bars were installed between the two π-shaped steel components, with the straight sections of the connecting reinforcing bars welded to the webs of the upper and lower π-shaped steel components; simultaneously, connecting plates were installed, and these plates were welded to the flanges of the upper and lower π-shaped steel components. Following this, web reinforcement, bottom reinforcement, and end plates were installed and welded to secure these components. Finally, the two π-shaped steel components were removed from the upper and lower fixed platforms, and concrete was poured to completely cover the connecting reinforcing bars and webs, resulting in the composite beam.

[0033] This utility model is not limited to the above-described embodiments. Any structure that is the same as or similar to the above-described embodiments of this utility model is within the protection scope of this utility model.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of this utility model that do not depart from the spirit and scope of this technical solution should be covered within the scope of the claims of this utility model.

Claims

1. A π-shaped steel-concrete composite beam, characterized in that, It includes at least two π-shaped steel members; the π-shaped steel members include a flange plate (1) and two web plates (2), the two web plates are located on the same side surface of the flange plate, the web plates are perpendicular to each other and one side of the web plates is fixedly connected to the flange plate, so that the flange plate and the two web plates form a steel member with a π-shaped cross section; Two π-shaped steel members are arranged opposite each other and parallel to each other, with the webs of the two π-shaped steel members facing opposite sides; a plurality of connecting steel bars (3) are provided between the two π-shaped steel members, the connecting steel bars being located on the side of the two webs of the π-shaped steel members that are opposite to each other; the connecting steel bars are respectively fixedly connected to the outer surface of one web of the two π-shaped steel members that is opposite to the other web; a concrete structural layer covering the connecting steel bars and the entire web is poured between the two π-shaped steel members.

2. The composite beam according to claim 1, characterized in that, The flange is composed of a first flange (4) and a second flange (5). Both the first flange and the second flange are arranged in the horizontal direction. One side edge of the first flange is fixedly connected to one side edge of the second flange. The two web plates are fixedly connected to the first flange and the second flange, respectively.

3. The composite beam according to claim 1, characterized in that, The connecting steel bar is a corrugated steel bar with multiple crests and troughs, and the crests and troughs have straight segments (6). The connecting steel bar is fixedly connected to the web of the π-shaped steel member through the straight segments.

4. The composite beam according to claim 1, characterized in that, Two connecting plates (7) are provided between the two π-shaped steel members. The connecting plates are located at one end of the π-shaped steel member along its length direction. The connecting plates are perpendicular to the flange plates, and the two sides of the connecting plates along its length direction are fixedly connected to the opposite side surfaces of the flange plates of the two π-shaped steel members, respectively.

5. The composite beam according to claim 1, characterized in that, Multiple connection holes (8) are provided on the connection plate, which are used for beam-column joints or primary and secondary beam joints.

6. The composite beam according to claim 1, characterized in that, Multiple web reinforcements (9) are provided on one side of the connecting steel bar. The web reinforcements are located inside or outside the connecting steel bar and are fixedly connected to the connecting steel bar.

7. The composite beam according to claim 1, characterized in that, Multiple bottom reinforcement bars (10) are laid at the bottom of the composite beam. The bottom reinforcement bars are distributed at intervals along the width direction of the flange plate, and the length direction of the bottom reinforcement bars is consistent with the length direction of the flange plate.

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