Novel external spliced steel flange concrete beam

Abstract

The invention discloses a novel external spliced steel flange concrete beam, which comprises pi-shaped flanges which are symmetrically arranged up and down and concrete poured in a space enclosed by the pi-shaped flanges, each pi-shaped flange is formed by splicing more than two T-shaped pieces or pi-shaped pieces, and the T-shaped pieces and the pi-shaped pieces are formed by assembling and welding or integrally rolling. Webs of the two groups of pi-shaped flanges are connected and fixed through vertical steel bars, the section width of the pi-shaped flanges is adjusted by increasing or decreasing the number of spliced T-shaped pieces or pi-shaped pieces, the section height is adjusted by adjusting the distance between the upper pi-shaped flange and the lower pi-shaped flange, and a plurality of vertical steel bars are jointly and fixedly connected with transverse steel bars through steel wires. According to the novel externally-spliced steel flange concrete beam, the structure is optimized through the externally-spliced steel flanges, the bearing capacity and rigidity are improved so that the large-span temporary-support-free requirement can be met, meanwhile, construction is simplified, the steel bar connecting stability is enhanced, the size adjusting universality is improved, and the durability is prolonged.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a novel externally spliced ​​steel flange concrete beam. Background Technology

[0002] In the field of building construction, precast concrete beams have been widely used in the construction of various building structures, including residential buildings, bridges, and industrial plants, due to their significant advantages such as convenient construction processes, easy control of component quality, and less on-site wet work. They have become one of the important components driving the development of building industrialization. In existing technologies, the typical structure of precast concrete beams usually consists of a lower precast beam body and an upper cast-in-place concrete layer. To achieve a reliable connection between the two and ensure overall coordinated load-bearing, various shear-resistant structures, such as rough surfaces, keyways, and shear stirrups, are required at the interface between the precast beam body and the cast-in-place layer. Through the interlocking and force-transfer effects of these structures, the precast and cast-in-place parts form a stable whole, thus jointly bearing the structural load.

[0003] However, in actual construction and application, this type of traditional precast concrete beam structure still has many unavoidable limitations and shortcomings: On the one hand, because the upper cast-in-place concrete layer needs a certain amount of time to cure after pouring to reach its design strength, and before the cast-in-place layer has formed sufficient load-bearing capacity, the lower precast beam body needs to bear various loads during the construction stage alone, including the self-weight of the cast-in-place concrete, the weight of construction machinery, and the load of operators. Therefore, a large number of temporary supports must be set up to reinforce and protect the precast beam body. The determination of the number of these temporary supports, the planning of their placement, and the control of their removal time all require precise calculation and strict control based on multiple factors such as the beam span, load distribution, and the concrete strength growth law. This not only places high demands on construction technology and increases the difficulty of organizing on-site construction, but also significantly prolongs the overall construction cycle and affects the efficiency of project construction due to the cumbersome process of erecting, maintaining, and removing temporary supports. On the other hand, the longitudinal reinforcement and other load-bearing components of traditional concrete beams are usually embedded inside the concrete, making it difficult to fully utilize the load-bearing efficiency of the steel bars, which significantly limits the improvement of the beam's load-bearing capacity and overall stiffness. When a project needs to meet the construction requirements of large spans and heavy loads, in order to ensure structural safety, it is often only possible to optimize the structure by increasing the cross-sectional size of the beams and the amount of steel reinforcement. This not only leads to a significant increase in the self-weight of the beams and increases the difficulty of transportation and hoisting, but also significantly increases the production cost of components and the construction cost of the project. It is not economical and is difficult to meet the needs of modern buildings for efficient, economical and large-span structures.

[0004] Therefore, a novel externally spliced ​​steel flange concrete beam is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a novel externally spliced ​​steel flange concrete beam. This invention aims to provide a novel externally spliced ​​steel flange concrete beam that optimizes the structure, enhances the load-bearing capacity and stiffness to meet the needs of large spans without temporary support, simplifies construction, enhances the stability of steel reinforcement connections, improves the versatility of dimensional adjustment, and extends durability.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A novel externally spliced ​​steel flange concrete beam includes symmetrically arranged π-shaped flanges and concrete poured within the space enclosed by the π-shaped flanges. The π-shaped flanges are composed of two or more T-shaped pieces or π-shaped pieces spliced ​​together. The T-shaped pieces and π-shaped pieces are welded together or rolled as a single piece. The webs of the two sets of π-shaped flanges are connected and fixed by vertical reinforcing bars. The cross-sectional width of the π-shaped flanges is adjusted by increasing or decreasing the number of spliced ​​T-shaped pieces or π-shaped pieces, and the cross-sectional height is adjusted by adjusting the spacing between the upper and lower π-shaped flanges. Transverse reinforcing bars are fixedly connected to the multiple vertical reinforcing bars by steel wires.

[0007] Preferably, the vertical reinforcing bar is a C-shaped reinforcing bar or a vertical reinforcing bar, the web of the π-shaped flange is provided with a plurality of circular holes, the two horizontal segments of the C-shaped reinforcing bar pass through the corresponding circular holes, and the vertical reinforcing bar is welded to the web of the π-shaped flange.

[0008] Preferably, each of the π-shaped flanges is provided with multiple clamping components, the number of which is consistent with the number of circular holes. The clamping components are used to tightly press the vertical reinforcing bars onto the web of the π-shaped flange. Each clamping component includes a rectangular block and a vertical groove on the web of the π-shaped flange. Two vertical grooves are symmetrically distributed on the front and rear sides of the circular holes. Each vertical groove is provided with a first slide rail, and a first slider is slidably connected to each first slide rail. A second slide rail is fixedly connected to each first slider, and a second slider is slidably connected to each second slide rail. The inner wall of each of the two vertical grooves away from the groove opening is provided with a vertical opening. An arc-shaped block is provided on the side of each of the two second sliders away from the vertical opening. A U-shaped block is fixedly connected to each of the two second sliders. The U-shaped block passes through the two vertical openings. A threaded rod is rotatably connected to the rectangular block. The U-shaped block is threadedly connected to the threaded rod. A gear is fixedly connected to the threaded rod. A rack is fixedly connected to the web of the π-shaped flange, and the rack meshes with the gear.

[0009] Preferably, it also includes a pneumatic assembly, which includes a sealing cylinder mounted on a π-shaped flange, a round rod slidably connected inside the sealing cylinder, the round rod being fixedly connected to a rectangular block, and the internal spaces of multiple cooperating sealing cylinders being connected to connecting pipes, each of the connecting pipes being provided with a threaded joint.

[0010] Preferably, a T-groove is provided on the side of the π-shaped flange away from the web, and multiple fixing blocks are fixedly connected in the T-groove. The connecting pipe is located in the T-groove (5) and passes through the multiple fixing blocks.

[0011] Preferably, the system further includes multiple positioning components for positioning the vertical reinforcing bars. Each positioning component includes two second telescopic rods fixedly connected to two π-shaped flanges. The telescopic ends of the two second telescopic rods are fixedly connected to bowl-shaped blocks. The two bowl-shaped blocks are elastically connected to the adjacent sides of the corresponding π-shaped flanges via second springs.

[0012] Preferably, the inner walls of the plurality of arc-shaped blocks are provided with anti-slip pads, the anti-slip pads are tightly fitted to the outer walls of the vertical reinforcing bars, and the inner walls of the bowl-shaped blocks are provided with wear-resistant linings, the surface of which is provided with anti-slip textures.

[0013] The present invention has the following beneficial effects: 1. Compared with the existing technology, the present invention innovatively adopts an external splicing steel flange structure, which forms the upper and lower flanges of the beam through modular splicing of T-shaped or π-shaped components. Compared with the traditional concrete beam with built-in longitudinal reinforcement components, the external steel plate flange can more efficiently improve the overall load-bearing capacity and stiffness of the beam, so that the beam can bear the construction load without the need to set up temporary supports in the application scenario of large span. This not only avoids the complicated process of setting up and removing temporary supports, but also eliminates the risk of beam cracking or damage caused by improper support management, significantly reducing the construction difficulty and greatly shortening the construction cycle. 2. Compared with the prior art, the present invention has a targeted design for the clamping component and the positioning component. The positioning component is specifically adapted to use with vertical steel bars. The vertical steel bars are first precisely pre-fixed by the elastically expandable bowl-shaped block. The clamping component is also versatile and can be adapted to both vertical steel bars and C-shaped steel bars. With the help of gear and rack transmission and threaded rod drive, the arc-shaped block is driven to achieve a stable clamping of the two types of steel bars. Compared with the traditional simple welding or simple insertion fixing method, it not only achieves the precise positioning and reliable connection of different types of vertical steel bars to the flange web, effectively avoids the steel bars from being misaligned or shifted due to external forces such as vibration during construction, and ensures the structural stress safety, but also eliminates the need for manual positioning, greatly reducing the intensity of manual operation and significantly improving the convenience of construction and work efficiency. 3. Compared with the existing technology, the present invention adopts a modular splicing design. The beam cross-section width can be adjusted as needed by flexibly increasing or decreasing the number of T-shaped or π-shaped splices. The cross-section height can be adapted by freely adjusting the spacing between the upper and lower steel flanges. Compared with the traditional concrete beams that require customized components of different specifications, there is no need to design and produce a variety of special components. This greatly improves the versatility and adaptability of the beam, reduces component inventory and manufacturing costs, and reduces the difficulty of component selection and replacement during construction, further controlling the overall construction cost. 4. Compared with the prior art, the external steel flange of the present invention can be used directly as a template during the concrete pouring process, without the need for additional erection or laying of special templates, effectively reducing the loss and waste of template materials and lowering the production cost; moreover, the splicing operation of the steel flange can be carried out by mechanized equipment assembly line construction, which is more industrialized and significantly improves construction efficiency compared with traditional manual rebar binding operations; at the same time, by adding anti-slip pads, wear-resistant linings and anti-corrosion protection structures in key parts, the erosion resistance of the beam and the stability of the connection nodes are effectively enhanced, and the overall service life of the beam is extended, taking into account both economy and practical durability.

[0014] In summary, this invention comprehensively and efficiently solves many problems existing in precast concrete beams, such as complex construction processes, limited load-bearing capacity and stiffness, poor cross-sectional size adaptability, insufficient stability of steel bar connections, high construction costs, and poor durability, by optimizing the beam structure, innovating connection and fixing methods to adapt to different types of steel bars, and adopting a modular splicing design. It has multiple advantages such as high load-bearing capacity, convenient construction, adjustable dimensions, cost-effectiveness, and long-term durability, and has broad prospects for promotion in the application of large-span and conventional-span beams in various building projects. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the external structure of a novel externally spliced ​​steel flange concrete beam proposed in this invention; Figure 2 This is a schematic diagram of a novel externally spliced ​​steel flange concrete beam for installing C-shaped steel bars, as proposed in this invention. Figure 3 This is a schematic diagram of a novel externally spliced ​​steel flange concrete beam for installing vertical reinforcing bars, as proposed in this invention. Figure 4 This is a schematic diagram of the structure of Embodiment 2 proposed in this invention; Figure 5 for Figure 4 A structural diagram from another perspective; Figure 6 for Figure 4 Enlarged structural diagram at point A; Figure 7 for Figure 5A magnified structural diagram at point B in the middle.

[0016] In the diagram: 1. π-shaped flange, 2. Vertical reinforcing bar, 3. Horizontal reinforcing bar, 4. Circular hole, 5. T-slot, 6. Fixing block, 7. Connecting pipe, 8. One-way valve, 9. Arc-shaped block, 10. Vertical groove, 11. First slide rail, 12. First slider, 13. Second slide rail, 14. Second slider, 15. First telescopic rod, 16. First spring, 17. Second telescopic rod, 18. Second spring, 19. Bowl-shaped block, 20. Vertical opening, 21. U-shaped block, 22. Threaded rod, 23. Sealing cylinder, 24. Gear, 25. Rack, 26. Rectangular block, 27. Circular rod. Detailed Implementation

[0017] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0018] Reference Figures 1-7 A novel externally spliced ​​steel flange concrete beam includes symmetrically arranged π-shaped flanges 1 and concrete poured within the enclosed space of the π-shaped flanges 1. Each π-shaped flange 1 is composed of two or more T-shaped or π-shaped pieces spliced ​​together. The T-shaped and π-shaped pieces are either welded together or integrally rolled. The webs of the two sets of π-shaped flanges 1 are connected and fixed by vertical reinforcing bars 2. The cross-sectional width of the π-shaped flange 1 is adjusted by increasing or decreasing the number of spliced ​​T-shaped or π-shaped pieces, and the cross-sectional height is adjusted by adjusting the spacing between the upper and lower π-shaped flanges 1. After adjustment, the spacing is fixed by temporary supports or positioning pins. Multiple vertical reinforcing bars 2 are connected by horizontal reinforcing bars 3 by steel wire, with the steel wire wrapped at least 3 times and tightened. The vertical reinforcing bars 2 are C-shaped or vertical reinforcing bars. The webs of the π-shaped flanges 1 have multiple circular holes 4, the diameter of which is larger than that of the C-shaped flanges 1. The diameter of the horizontal section of the C-shaped steel bar is 2-5mm larger. The two horizontal sections of the C-shaped steel bar pass through the corresponding circular holes 4. After passing through, the exposed length of the horizontal section is 10-20mm. The vertical steel bar is welded to the web of the π-shaped flange 1. The height of the weld leg formed at the weld is not less than 0.5 times the diameter of the vertical steel bar.

[0019] Each π-shaped flange 1 is equipped with multiple clamping components, the number of which corresponds to the number of circular holes 4, and they are arranged one-to-one on the outside of each circular hole 4. The clamping components are used to tightly press the vertical reinforcing bars 2 onto the web of the π-shaped flange 1. Each clamping component includes a rectangular block 26 and a vertical groove 10 set on the web of the π-shaped flange 1. The depth of the vertical groove 10 is 15-30mm, and the width is adapted to the first slider 12. Two vertical grooves 10 are symmetrically distributed on the front and rear sides of the circular holes 4. Each vertical groove 10 is equipped with a first slide rail 11, which is fixed to the inner wall of the vertical groove 10 by bolts. A first slider 12 is slidably connected to each first slide rail 11, and a lubricating coating is provided between the first slider 12 and the first slide rail 11. A second slide rail 13 is fixedly connected to each first slider 12, and the second slide rail 13 is connected to the first slide rail 11. Vertically arranged, each second slide rail 13 is slidably connected to a second slider 14. The inner wall of each of the two vertical grooves 10, away from the groove opening, has a vertical opening 20. The width of the vertical opening 20 matches the thickness of the U-shaped block 21. The side of each second slider 14 away from the vertical opening 20 has an arc-shaped block 9. Multiple arc-shaped blocks 9 have anti-slip pads on their inner walls, which are tightly fitted to the outer wall of the vertical reinforcing bar 2. The two second sliders 14 are jointly fixedly connected to a U-shaped block 21, which is made of bent steel plate. The U-shaped block 21 passes through the two vertical openings 20. A threaded rod 22 is rotatably connected to a rectangular block 26. A bearing is provided between the threaded rod 22 and the rectangular block 26. The U-shaped block 21 is threadedly connected to the threaded rod 22. A gear 24 is fixedly connected to the threaded rod 22, and the gear 24 is connected to the threaded rod 22 via a flat key. A rack 25 is fixedly connected to the web of the π-shaped flange 1. The rack 25 is fixed by welding and meshes with the gear 24.

[0020] The system also includes a pneumatic assembly, which includes a sealing cylinder 23 mounted on the π-shaped flange 1. The sealing cylinder 23 is fixed to the preset mounting position of the π-shaped flange 1 by a flange or welding. A round rod 27 is slidably connected inside the sealing cylinder 23. A sealing ring is provided between the round rod 27 and the inner wall of the sealing cylinder 23. The round rod 27 is fixedly connected to a rectangular block 26. The internal spaces of multiple mating sealing cylinders 23 are all connected to connecting pipes 7. The connecting pipes 7 are made of stainless steel and each connecting pipe 7 is provided with a threaded joint. A T-groove 5 is provided on the side of the π-shaped flange 1 away from the web. Multiple fixing blocks 6 are fixedly connected in the T-groove 5. The connecting pipe 7 is located in the T-groove 5 and passes through the multiple fixing blocks 6.

[0021] It also includes multiple positioning components, which are used to position the vertical reinforcing bars. The positioning components include two second telescopic rods 17 fixedly connected to two π-shaped flanges 1. The telescopic ends of the two second telescopic rods 17 are fixedly connected to bowl-shaped blocks 19. The two bowl-shaped blocks 19 are elastically connected to the adjacent sides of the corresponding π-shaped flanges 1 through second springs 18. The inner wall of the bowl-shaped blocks 19 is provided with a wear-resistant lining, and the surface of the wear-resistant lining is provided with anti-slip texture.

[0022] The functional principle of this invention can be explained by the following operation: First, according to the cross-sectional width requirements of the target beam, select the corresponding number of T-shaped parts or π-shaped parts to splice them together to form a symmetrical π-shaped flange 1. The T-shaped parts and π-shaped parts can be welded or rolled in one piece to ensure structural stability. Then, adjust the spacing between the upper and lower π-shaped flanges 1 according to the cross-sectional height design requirements to reserve a suitable space for concrete pouring.

[0023] Subsequently, installation and positioning operations are carried out for different types of vertical reinforcing bars 2. If it is a C-shaped reinforcing bar, its two horizontal sections are directly passed through the pre-set round holes 4 on the web of the π-shaped flange 1. If it is a vertical reinforcing bar, it is first pre-fixed with the help of positioning components. Under the elastic force of the second spring 18, the second telescopic rod 17 of the positioning components pushes the bowl-shaped block 19 to clamp the vertical reinforcing bar. After achieving precise positioning, welding or clamping components can be selected for further fixing.

[0024] Next, an external gas source is connected through the threaded joint on the connecting pipe 7. The gas is introduced into the sealing cylinder 23 through the connecting pipe 7, pushing the round rod 27 to slide in the sealing cylinder 23. The round rod 27 drives the rectangular block 26 to move synchronously, and the movement of the rectangular block 26 will drive the U-shaped block 21 to move accordingly, thereby pulling the arc block 9 to initially approach the vertical steel bar 2, so that the vertical steel bar 2 is located between the arc block 9 and the web of the π-shaped flange 1. After the U-shaped block 21 moves to the preset position, the gear 24 on the threaded rod 22 connected to it meshes with the rack 25 on the web of the π-shaped flange 1. As the U-shaped block 21 continues to move, the gear 24 drives the threaded rod 22 to rotate under the action of the rack 25. The rotation of the threaded rod 22 drives the U-shaped block 21 to move towards the vertical groove 10, while simultaneously driving the second slide rail 13 and the second slider 14 to retract into the vertical groove 10. Finally, the arc-shaped block 9 tightly adheres to the outer wall of the vertical steel bar 2 and applies clamping force. Whether it is a C-shaped steel bar or a vertical steel bar, it can achieve stable clamping through this linkage process, effectively preventing the steel bar from shifting during construction. The connecting pipe 7 is fixed by the fixing block 6 in the T-shaped groove 5, avoiding messy pipelines that affect subsequent construction.

[0025] After fixing the vertical reinforcing bars 2, the horizontal reinforcing bars 3 are fixedly connected to the multiple vertical reinforcing bars 2 with steel wires to form a complete reinforcing steel skeleton, enhancing the overall load-bearing performance of the beam. After the reinforcing bars are connected, the connection status of each component needs to be checked to ensure that there is no looseness or positioning deviation. Finally, the assembled beam structure is placed on its side, with the upper and lower π-shaped flanges 1 enclosing the formwork to form a closed pouring space. No additional formwork is required; concrete is poured directly into the space. Once the concrete reaches the design strength, the preparation of the new type of externally spliced ​​π-shaped flange concrete beam is completed. Its external flange structure can simultaneously play a load-bearing and protective role.

[0026] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A novel externally spliced ​​steel flange concrete beam, characterized in that, include: The π-shaped flanges (1) are arranged symmetrically on the upper and lower sides, and the concrete is poured into the space enclosed by the π-shaped flanges (1). The π-shaped flanges (1) are composed of two or more T-shaped pieces or π-shaped pieces spliced ​​together. The T-shaped pieces and π-shaped pieces are welded together or rolled as one piece. The webs of the two sets of π-shaped flanges (1) are connected and fixed by vertical steel bars (2). The cross-sectional width of the π-shaped flanges (1) is adjusted by increasing or decreasing the number of spliced ​​T-shaped pieces or π-shaped pieces. The cross-sectional height is adjusted by adjusting the spacing between the upper and lower π-shaped flanges (1). The multiple vertical steel bars (2) are connected by steel wires to a transverse steel bar (3).

2. The novel externally spliced ​​steel flange concrete beam according to claim 1, characterized in that: The vertical steel bar (2) is a C-shaped steel bar or a vertical steel bar. The web of the π-shaped flange (1) is provided with multiple round holes (4). The two horizontal segments of the C-shaped steel bar pass through the corresponding round holes (4). The vertical steel bar is welded to the web of the π-shaped flange (1).

3. A novel externally spliced ​​steel flange concrete beam according to claim 2, characterized in that: Each of the π-shaped flanges (1) is provided with multiple clamping components, the number of which is the same as the number of circular holes (4). The clamping components are used to tightly press the vertical steel bars (2) onto the web of the π-shaped flange (1). Each clamping component includes a rectangular block (26) and a vertical groove (10) provided on the web of the π-shaped flange (1). Two vertical grooves (10) are symmetrically distributed on the front and rear sides of the circular holes (4). Each vertical groove (10) is provided with a first slide rail (11). A first slider (12) is slidably connected to each first slide rail (11). A second slide rail (13) is fixedly connected to each first slider (12). A second slide rail (13) is slidably connected to each second slide rail (13). There is a second slider (14), and the inner wall of the two vertical grooves (10) away from the groove opening is provided with a vertical opening (20). The two second sliders (14) are provided with an arc block (9) on the side away from the vertical opening (20). The two second sliders (14) are fixedly connected to a U-shaped block (21). The U-shaped block (21) passes through the two vertical openings (20). A threaded rod (22) is rotatably connected to the rectangular block (26). The U-shaped block (21) is threadedly connected to the threaded rod (22). A gear (24) is fixedly connected to the threaded rod (22). A rack (25) is fixedly connected to the web of the π-shaped flange (1). The rack (25) meshes with the gear (24).

4. A novel externally spliced ​​steel flange concrete beam according to claim 3, characterized in that: It also includes a pneumatic assembly, which includes a sealing cylinder (23) mounted on a π-shaped flange (1). A round rod (27) is slidably connected inside the sealing cylinder (23). The round rod (27) is fixedly connected to a rectangular block (26). The internal spaces of multiple cooperating sealing cylinders (23) are all connected to connecting pipes (7). Each connecting pipe (7) is provided with a threaded joint.

5. A novel externally spliced ​​steel flange concrete beam according to claim 4, characterized in that: The π-shaped flange (1) is provided with a T-shaped groove (5) on the side away from the web. Multiple fixing blocks (6) are fixedly connected in the T-shaped groove (5). The connecting pipe (7) is located in the T-shaped groove (5) and passes through the multiple fixing blocks (6).

6. A novel externally spliced ​​steel flange concrete beam according to claim 3, characterized in that: It also includes multiple positioning components, which are used to position the vertical steel bars. The positioning components include two second telescopic rods (17) fixedly connected to two π-shaped flanges (1). The telescopic ends of the two second telescopic rods (17) are fixedly connected to bowl-shaped blocks (19). The two bowl-shaped blocks (19) are elastically connected to the adjacent sides of the corresponding π-shaped flanges (1) through second springs (18).

7. A novel externally spliced ​​steel flange concrete beam according to claim 6, characterized in that: The inner walls of the multiple arc-shaped blocks (9) are provided with anti-slip pads, which are closely fitted to the outer walls of the vertical steel bars (2). The inner walls of the bowl-shaped blocks (19) are provided with wear-resistant linings, and the surface of the wear-resistant linings is provided with anti-slip textures.

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