A full-precast floor slab and steel beam connecting structure
By forming a ring structure between the precast floor slab and the steel beam, and using the lap joint of U-shaped bars and inverted U-shaped anchor bars and the connection of on-site poured concrete, the problem of the weak connection between the precast floor slab and the steel beam was solved, thus improving the structural safety and seismic performance of the building.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUANGGANG POLYTECHNIC COLLEGE
- Filing Date
- 2025-07-21
- Publication Date
- 2026-06-12
AI Technical Summary
In existing technologies, the connection between precast floor slabs and steel beams is not wide enough, resulting in an unstable connection that affects the structural safety and seismic performance of buildings. Furthermore, traditional connection methods have weak shear and tensile strength.
The precast floor slabs are equipped with horizontal U-shaped connecting bars and steel embedded parts at intervals on both sides, and inverted U-shaped anchor bars at intervals on the top of the steel beams to form a ring structure. Horizontal limiting bars are inserted inside the rings, and the structure is connected as a whole by pouring concrete on site.
It effectively increases the width and integrity of the beam-slab connection, improves the structural stress performance and safety reserve, and simplifies the hoisting and installation process of the fully prefabricated floor slab, ensuring construction safety and seismic performance.
Smart Images
Figure CN224351407U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of prefabricated structure technology, specifically to a connection structure between a fully prefabricated floor slab and a steel beam. Background Technology
[0002] In prefabricated industrial plants and other buildings, a combination of steel beams and fully precast concrete floor slabs is commonly used. This involves installing the steel beams on-site, then hoisting the precast floor slabs so that their sides rest directly on top of the steel beams. Reinforcing steel is then connected at the beam-slab joint, and concrete is poured to form a unified structure. This construction method eliminates the need for erecting and dismantling scaffolding to support the floor slab, reduces on-site reinforcement binding and concrete pouring, significantly improves on-site construction efficiency, and ultimately achieves rapid construction of the main structure, saving construction time and costs.
[0003] In actual construction, the width of the precast floor slab's side overlap with the top of the steel beam typically needs to be at least 50mm to ensure reliable support from the steel beam and prevent the extremely dangerous situation of the precast floor slab detaching from the steel beam during construction. However, the top width of the steel beam itself is limited, usually only 200mm to 250mm, while the width of the precast floor slab's side overlap with the top of the steel beam is as wide as 100mm. This results in an effective width of only 100mm to 150mm at the beam-slab connection, making it difficult to effectively connect the precast floor slab and steel beam into a whole, which significantly affects the structural safety and seismic performance of the building. On the other hand, traditional steel beams only have single or double rows of studs at intervals on top to provide shear and tensile resistance, and the connection with the protruding reinforcing bars on the sides of the precast floor slab is limited, making it difficult to ensure the coordinated stress distribution between the beam and slab, thus reducing the structural load-bearing capacity and safety margin to some extent.
[0004] Patent CN112282069A discloses a connection structure and construction method for steel beams and precast floor slabs. It uses traditional studs and lapped additional reinforcing bars, failing to form a ring-type reinforcing bar connection structure. The beam-slab load is achieved solely through simple rebar tying, resulting in weak shear and tensile strength and limited overall stiffness improvement. Patent CN218713978U discloses a connection structure for precast assembled concrete slabs and steel beams, using L-shaped splice plates and mechanical connections with fastening bolts. This relies on bolt preload to transfer loads, making it prone to loosening due to vibration over long-term use. Furthermore, it lacks the synergistic force-bearing effect of reinforced concrete, resulting in poor overall seismic performance. Utility Model Content
[0005] To address the aforementioned technical problems, the purpose of this utility model is to provide a connection structure between a fully prefabricated floor slab and a steel beam. The fully prefabricated floor slab is supported on the top of the steel beam by embedded steel parts on both sides, which can significantly reduce the overlap width of the fully prefabricated floor slab on the top of the steel beam, effectively increase the width of the beam-slab connection, and greatly improve the cooperative stress between the two through the U-shaped rib lap joint between the beam and the slab, which is conducive to ensuring the structural safety and seismic performance of prefabricated buildings.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows:
[0007] A precast floor slab and steel beam connection structure is provided, wherein horizontal U-shaped connecting bars and steel embedded parts are arranged at intervals on both sides of the precast floor slab, and inverted U-shaped anchor bars are arranged at intervals on the top of the steel beam. The side of the precast floor slab overlaps the top edge of the steel beam. The horizontal U-shaped connecting bars on the side of the precast floor slab overlap with the inverted U-shaped anchor bars on the top of the steel beam to form a ring. Horizontal limiting bars are inserted inside the ring. The connection between the precast floor slab and the steel beam is formed as one unit by on-site pouring of concrete.
[0008] The precast floor slab and steel beam connection structure has a spacing of 150mm to 200mm between adjacent inverted U-shaped anchor bars at the top of the steel beam, and the bottom end of the inverted U-shaped anchor bars is welded and fixed to the top of the steel beam.
[0009] The precast floor slab and steel beam connection structure includes horizontal U-shaped connecting bars spaced apart on both sides of the precast floor slab, with a spacing of 150mm to 200mm between adjacent horizontal U-shaped connecting bars; and steel embedded parts symmetrically arranged on both sides of the precast floor slab, with a total number of no less than 4, and the positions of the steel embedded parts are staggered from the horizontal U-shaped connecting bars.
[0010] The precast floor slab and steel beam connection structure includes inserting no fewer than four horizontal limiting bars inside the ring formed by the lap of the horizontal U-shaped connecting bars and the inverted U-shaped anchor bars. These bars are arranged at the four corners of the inner side of the ring and pass through the through-bar holes of the steel embedded parts.
[0011] The connection structure between the precast floor slab and the steel beam includes a steel plate with a thickness of not less than 5mm for the vertical plate of the steel embedded part. The embedded section of the vertical plate inside the floor slab is provided with 4 horizontal anchor bars, and the extended section of the vertical plate outside the floor slab is provided with 2 through holes. The outer end of the vertical plate of the steel embedded part is provided with a vertical threaded hole, and a vertical bolt is installed through the threaded hole. After the side of the precast floor slab rests on the top of the steel beam, it is supported and leveled by the vertical bolt.
[0012] The connection structure between the precast floor slab and the steel beam is such that the vertical bolt consists of a long screw and a bolt head as one piece. The lower end of the long screw serves as the support point for the precast floor slab, and the long screw is kept in contact with the top of the steel beam by rotating the bolt head.
[0013] The connection structure between the precast floor slab and the steel beam includes through holes that also serve as hoisting holes for the precast floor slab during installation.
[0014] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0015] 1. The fully prefabricated floor slab of this utility model is supported at the top center of the steel beam by vertical bolts at the ends of the steel embedded parts on both sides. This essentially prevents the extremely dangerous situation of the fully prefabricated floor slab falling off the steel beam, effectively ensuring the safety of construction workers. Furthermore, the width of the fully prefabricated floor slab overlapping the top of the steel beam can be reduced to 20mm, increasing the effective connection width between the beam and slab by approximately 25% or more, significantly improving the overall integrity of the beam-slab connection.
[0016] 2. The fully prefabricated floor slab of this utility model has horizontal U-shaped connecting bars extending from both sides, and inverted U-shaped anchor bars welded to the top of the steel beam. The two are joined together to form a ring, and more than four horizontal limiting bars are inserted into the ring to form a reliable steel bar connection. This can greatly improve the coordinated stress of the beam and slab, and improve the structural stress performance and safety reserve.
[0017] 3. The steel embedded section of this utility model has two through holes, one above the other, which can be used as lifting holes during the hoisting of the precast floor slab. This eliminates the need for pre-embedding and subsequent cutting of lifting rings on the top surface of the precast floor slab, thus improving the production and installation efficiency of the precast floor slab to a certain extent. This achieves the goals of ensuring the safety of construction workers, increasing the effective connection width between the precast floor slab and the steel beam, improving the beam-slab cooperative load-bearing performance, and ensuring structural safety and seismic performance. Attached Figure Description
[0018] Figure 1 This is a three-dimensional schematic diagram of the steel beam of this utility model.
[0019] Figure 2 This is a three-dimensional schematic diagram of the fully prefabricated floor slab of this utility model.
[0020] Figure 3 This is a three-dimensional schematic diagram of the steel embedded part of this utility model.
[0021] Figure 4 This is a three-dimensional schematic diagram of the connection structure between the fully prefabricated floor slab and the steel beam of this utility model.
[0022] Figure 5 This is a cross-sectional view of the connection structure between the horizontal U-shaped connecting bars of the fully prefabricated floor slab and the steel beam according to this utility model.
[0023] Figure 6 This is a cross-sectional view of the connection structure between the steel embedded parts and steel beams of the fully prefabricated floor slab of this utility model.
[0024] In the diagram: 1. Steel beam, 1-1. Inverted U-shaped anchor bar, 2. Fully precast floor slab, 2-1. Horizontal U-shaped connecting bar, 3. Steel embedded part, 3-1. Through-bar hole, 3-2. Vertical slab, 3-3. Horizontal anchor bar, 3-4. Vertical bolt, 3-4-1. Long threaded rod, 3-4-2. Bolt head, 4. Horizontal limiting bar, 5. Concrete. Detailed Implementation
[0025] like Figures 1-6 As shown, this utility model proposes a connection structure between a fully prefabricated floor slab and a steel beam. Horizontal U-shaped connecting bars 2-1 and steel embedded parts 3 are arranged at intervals on both sides of the fully prefabricated floor slab 2. Inverted U-shaped anchor bars 1-1 are arranged at intervals on the top of the steel beam 1. After the side of the fully prefabricated floor slab 2 rests on the top edge of the steel beam 1, the horizontal U-shaped connecting bars 2-1 on the side of the fully prefabricated floor slab 2 overlap with the inverted U-shaped anchor bars 1-1 on the top of the steel beam 1 to form a ring. Horizontal limiting bars 4 are inserted inside the ring. The connection between the fully prefabricated floor slab 2 and the steel beam 1 is formed into one piece by on-site poured concrete 5.
[0026] The spacing between adjacent inverted U-shaped anchor bars 1-1 at the top of steel beam 1 is 150mm to 200mm, and the bottom end of the inverted U-shaped anchor bars 1-1 is welded and fixed to the top of steel beam 1; horizontal U-shaped connecting bars 2-1 are provided at intervals on both sides of the fully precast floor slab 2, and the spacing between adjacent horizontal U-shaped connecting bars 2-1 is 150mm to 200mm; steel embedded parts 3 are symmetrically provided on both sides of the fully precast floor slab 2, and the total number is not less than 4. The positions of the horizontal U-shaped connecting bars 2-1 and the steel embedded parts 3 should avoid the position of the inverted U-shaped anchor bars 1-1 at the top of steel beam 1; not less than 4 horizontal limiting bars 4 are inserted into the ring formed by the overlap of the horizontal U-shaped connecting bars 2-1 and the inverted U-shaped anchor bars 1-1, and are respectively arranged at the four corners of the inner side of the ring. The horizontal limiting bars 4 also pass through the through holes 3-1 of the steel embedded parts 3.
[0027] The vertical plate 3-2 of the steel embedded part 3 is made of steel plate with a thickness of not less than 5mm. The embedded section of the vertical plate 3-2 inside the floor slab is provided with 4 horizontal anchor bars 3-3. The extended section of the vertical plate 3-2 outside the floor slab is provided with 2 through holes 3-1, which also serve as hoisting holes for the fully prefabricated floor slab 2. The outer end of the vertical plate 3-2 of the steel embedded part 3 is provided with a vertical threaded hole, through which a vertical bolt 3-4 is installed. After the side of the fully prefabricated floor slab 2 rests on the top of the steel beam 1, it is supported and leveled by the vertical bolt 3-4. The vertical bolt 3-4 is integrally formed by a long screw 3-4-1 and a bolt head 3-4-2. By rotating the bolt head 3-4-2, the long screw 3-4-1 is raised and lowered to keep in contact with the top of the steel beam 1, thus providing support and leveling.
[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.
[0029] like Figures 1-6 As shown, the construction process of the prefabricated floor slab and steel beam connection structure of this utility model is as follows:
[0030] (1) During factory production, the precast floor slab 2 is cast in one piece. Horizontal U-shaped connecting bars 2-1 and steel embedded parts 3 are set at intervals on both sides of the precast floor slab 2. The through holes 3-1 of the steel embedded parts 3 can serve as the lifting points when the precast floor slab 2 is demolded and hoisted.
[0031] (2) During on-site construction, after the steel beam 1 is installed, the fully prefabricated floor slab 2 is hoisted so that its side falls on the top of the steel beam 1 with an overlap width of 20mm. By adjusting the vertical bolts 3-4 at the outer end of the vertical plate 3-2 of the steel embedded part 3, the support point of the fully prefabricated floor slab 2 is placed at the middle position of the top of the steel beam 1.
[0032] (3) The horizontal U-shaped connecting bar 2-1 on the side of the fully prefabricated floor slab 2 overlaps with the inverted U-shaped anchor bar 1-1 at the top of the steel beam 1 to form a ring. No less than 4 horizontal limiting bars 4 are inserted into the ring and arranged at the four corners of the inner side of the ring. The horizontal limiting bars 4 also pass through the bar hole 3-1 of the steel embedded part 3.
[0033] (4) Finally, concrete 5 is poured at the connection between the precast floor slab 2 and the steel beam 1, and after it hardens, it forms a whole.
[0034] The results of the embodiments show that the connection structure between the prefabricated floor slab and the steel beam in this utility model can ensure the safety of construction workers, significantly reduce the overlap width of the prefabricated floor slab side on the top of the steel beam, and increase the width of the effective connection part between the beam and the slab. The utility model has a reasonable structure and reliable connection. No bottom support is required during installation. The U-shaped bar lap joint between the beam and the slab can greatly improve the cooperative stress of the two, which is conducive to ensuring the structural safety and seismic performance of the prefabricated building.
[0035] Obviously, as a technological advancement, those skilled in the art can implement the concept of this utility model in various ways. Therefore, this utility model and its embodiments are not limited to the examples shown above, but can be varied within the framework of the claims.
Claims
1. A connection structure between a fully prefabricated floor slab and a steel beam, characterized in that, Horizontal U-shaped connecting bars and steel embedded parts are set at intervals on both sides of the fully precast floor slab, and inverted U-shaped anchor bars are set at intervals on the top of the steel beam. The side of the fully precast floor slab overlaps the top edge of the steel beam. The horizontal U-shaped connecting bars on the side of the fully precast floor slab overlap with the inverted U-shaped anchor bars on the top of the steel beam to form a ring. Horizontal limiting bars are inserted inside the ring. The connection between the fully precast floor slab and the steel beam is formed into one piece by on-site poured concrete.
2. The connection structure between the precast floor slab and steel beam as described in claim 1, characterized in that, The spacing between adjacent inverted U-shaped anchor bars at the top of the steel beam is 150mm to 200mm, and the bottom end of the inverted U-shaped anchor bars is welded and fixed to the top of the steel beam.
3. The connection structure between the precast floor slab and steel beam as described in claim 1, characterized in that, The precast floor slab is provided with horizontal U-shaped connecting bars at intervals on both sides, with a spacing of 150mm to 200mm between adjacent horizontal U-shaped connecting bars; steel embedded parts are symmetrically provided on both sides of the precast floor slab, with a total number of no less than 4, and the position of the steel embedded parts is staggered from the horizontal U-shaped connecting bars.
4. The connection structure between the precast floor slab and steel beam as described in claim 1, characterized in that, No fewer than four horizontal limiting bars are inserted into the ring formed by the overlap of the horizontal U-shaped connecting bar and the inverted U-shaped anchor bar, respectively arranged at the four corners of the inner side of the ring. The horizontal limiting bars also pass through the through holes of the steel embedded part.
5. The connection structure between the precast floor slab and steel beam according to claim 1, characterized in that, The vertical plate of the steel embedded part is a steel plate with a thickness of not less than 5mm. The embedded section of the vertical plate inside the floor slab is provided with 4 horizontal anchor bars. The extended section of the vertical plate outside the floor slab is provided with 2 through holes. The outer end of the vertical plate of the steel embedded part is provided with a vertical threaded hole, and a vertical bolt is installed through the threaded hole. After the side of the fully prefabricated floor slab falls on the top of the steel beam, it is supported and leveled by the vertical bolt.
6. The connection structure between the precast floor slab and steel beam according to claim 5, characterized in that, The vertical bolt consists of a long threaded rod and a bolt head as one piece. The lower end of the long threaded rod serves as a support point for the precast floor slab. The long threaded rod is kept in contact with the top of the steel beam by rotating the bolt head.
7. The connection structure between the precast floor slab and steel beam according to claim 5, characterized in that, The through-beam holes also serve as hoisting holes during the hoisting of the fully precast floor slabs.