Double-layer prestressed concrete laminated slab

Abstract

The invention discloses a double-layer prestressed concrete laminated slab, and relates to the technical field of laminated slabs, the double-layer prestressed concrete laminated slab comprises concrete ribs, connecting pieces, a concrete bottom plate, longitudinal prestressed steel bars in the ribs, longitudinal prestressed steel bars in the bottom plate and transverse steel bars in the bottom plate, and holes are formed in the outer surfaces of the connecting pieces. According to the double-layer prestressed concrete laminated slab, in order to further improve the firmness of the prestressed concrete laminated slab, firstly, rib inner longitudinal prestressed steel bars are buried in the concrete ribs to improve the firmness of the concrete ribs, and bottom plate inner longitudinal prestressed steel bars are buried in the concrete bottom plate to improve the firmness of the concrete ribs; the concrete ribs and the concrete bottom plate are fixedly connected through the connecting pieces, the firmness of the prestressed concrete laminated slab is further improved, the dead weight of the laminated slab can be effectively reduced by forming the holes in the center positions of the connecting pieces of the prestressed concrete laminated slab, and double-layer prestress of the laminated slab is achieved; and the firmness of the laminated slab is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of laminated plates, and specifically to a double-layer prestressed concrete laminated plate. Background Art

[0002] A prestressed concrete laminated plate is a structural material that improves load-bearing capacity and crack resistance by stacking multiple concrete plates together and applying prestress. It is a type of composite material mainly used in buildings, bridges, and other large structures. Before concrete pouring, prestressed steel bars are tensioned so that the concrete can withstand greater external loads after curing. Prestress can effectively reduce cracks generated during the use of concrete and improve its durability and service life.

[0003] Currently, most prestressed concrete laminated plates are single-layer plates, with only one layer of concrete plus prestressed steel bars. Their structure is simple and the load-bearing capacity is poor. Since the single-layer prestressed concrete laminated plate is relatively thin, it is more likely to generate cracks when subjected to concentrated loads and long-term loads, thereby making it insufficient in terms of load-bearing capacity, crack resistance, and deformation performance, thus reducing the firmness of the prestressed concrete laminated plate.

[0004] Therefore, we propose a double-layer prestressed concrete laminated plate to solve the problems mentioned above. Summary of the Invention

[0005] The purpose of the present invention is to provide a double-layer prestressed concrete laminated plate to solve the problem of the simple structure and low firmness of the traditional prestressed concrete laminated plate proposed in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A double-layer prestressed concrete laminated plate, including concrete ribs, connectors, a concrete bottom plate, longitudinal prestressed steel bars in the ribs, longitudinal prestressed steel bars in the bottom plate, and transverse steel bars in the bottom plate. The outer surface of the connector is provided with holes, and the outer surface of the concrete bottom plate is provided with openings. The holes and the openings are at the same cross-section position. The longitudinal prestressed steel bars in the ribs are arranged in the concrete ribs, and the longitudinal prestressed steel bars in the bottom plate are embedded in the concrete bottom plate.

[0007] Preferably, both the longitudinal prestressed steel bars in the bottom plate and the transverse steel bars in the bottom plate are far from the opening.

[0008] Preferably, the top of each concrete rib is at a distance of 10 mm - 25 mm from the external composite layer concrete.

[0009] Preferably, the thickness of each concrete rib is 20 mm - 40 mm.

[0010] Preferably, the spacing between every two adjacent concrete ribs is an integer multiple of the spacing between every two adjacent openings.

[0011] Preferably, the connecting member is a continuous bending wave shape of steel bars, steel pipes and steel strips.

[0012] Preferably, the connecting member is a corrugated profiled steel sheet.

[0013] Preferably, the connecting member is a concrete rib with holes.

[0014] Preferably, the concrete rib is wrapped with an open C-shaped steel, and the connecting member is connected to the concrete bottom plate together.

[0015] Preferably, the connecting member penetrates through the external C-shaped steel and is effectively connected to the concrete rib together.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. In order to further improve the firmness of the prestressed concrete composite slab, first, by burying the longitudinal prestressed steel bars in the concrete rib, the firmness of the concrete rib is improved. By burying the longitudinal prestressed steel bars in the concrete bottom plate and using the connecting member to fixedly connect the concrete rib and the concrete bottom plate, the firmness of the prestressed concrete composite slab is further improved. By opening holes at the center position of the connecting member of the prestressed concrete composite slab, the self-weight of the composite slab can be effectively reduced, realizing double-layer prestress of the composite slab and further improving the firmness of the composite slab, solving the problem of simple structure and low firmness of the traditional prestressed concrete composite slab in the prior art.

[0017] 2. Opening holes in the concrete bottom plate of the prestressed concrete composite slab can reduce the amount of concrete used. The opening of the holes can also help to form a better connection between the concrete bottom plate and the connecting member. The longitudinal prestressed steel bars and transverse steel bars in the bottom plate are all far away from the holes, which can reduce the risk of cracks in the composite slab caused by stress concentration. By opening holes and openings in the prestressed concrete composite slab, the amount of concrete used is effectively reduced, saving costs.

[0018] 3. By wrapping the outer surface of the concrete rib with an open C-shaped steel, the firmness of the concrete rib can be further improved. During the processing and manufacturing of the connecting member, the connecting member is processed into a continuous bending wave shape of steel bars, steel pipes and steel strips, further enhancing the strength of the prestressed concrete composite slab, allowing deformation between the concrete rib and the composite layer, and preventing cracks caused by expansion and contraction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view three-dimensional view of a double-layer prestressed concrete composite slab of the present invention; Figure 2Isometric view of the concrete rib part of a double - layer prestressed concrete composite slab of the present invention; Figure 3 Isometric view of the longitudinal prestressed steel bars in the bottom slab of a double - layer prestressed concrete composite slab of the present invention; Figure 4 Isometric view of the longitudinal prestressed steel bars in the rib of a double - layer prestressed concrete composite slab of the present invention; Figure 5 Isometric view of the transverse steel bars in the bottom slab of a double - layer prestressed concrete composite slab of the present invention.

[0020] In the figure: 1. Concrete rib; 2. Connector; 3. Concrete bottom slab; 4. Longitudinal prestressed steel bars in the rib; 5. Longitudinal prestressed steel bars in the bottom slab; 6. Transverse steel bars in the bottom slab; 7. Hole; 8. Opening. Specific implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Please refer to Figures 1-5 , the present invention provides a technical solution: a double - layer prestressed concrete composite slab, including a concrete rib 1, a connector 2, a concrete bottom slab 3, longitudinal prestressed steel bars 4 in the rib, longitudinal prestressed steel bars 5 in the bottom slab, and transverse steel bars 6 in the bottom slab. The outer surface of the connector 2 is provided with holes 7, and the outer surface of the concrete bottom slab 3 is provided with openings 8. The holes 7 and the openings 8 are at the same cross - section position. The longitudinal prestressed steel bars 4 in the rib are arranged in the concrete rib 1, and the longitudinal prestressed steel bars 5 in the bottom slab are embedded in the concrete bottom slab 3.

[0023] In this embodiment, in order to further improve the firmness of the prestressed concrete composite slab, first, by burying longitudinal prestressed steel bars 4 inside the concrete rib 1, the firmness of the concrete rib 1 is improved. Among them, the longitudinal prestressed steel bars 4 inside the rib are tensioned before the concrete solidifies. After the tension is released, the inside of the concrete rib 1 will be maintained in a compressive stress state. This state effectively reduces the cracks in the concrete rib 1 caused by bending and tensile stresses, and improves the crack resistance of the concrete. In addition, the presence of the longitudinal prestressed steel bars 4 inside the rib can provide additional load-bearing capacity for the concrete rib 1, enabling the rib structure to more effectively distribute and resist stresses when bearing large concentrated loads and span loads, reducing the risk of its damage. By burying longitudinal prestressed steel bars 5 inside the concrete floor slab 3, the load-bearing capacity of the concrete floor slab 3 can be significantly improved, making it more stable when bearing the design load and reducing the risk of excessive deformation and damage. In addition, the presence of the longitudinal prestressed steel bars 5 inside the floor slab makes a constant compressive stress state formed inside the concrete floor slab 3, which can effectively inhibit the generation and expansion of cracks and improve the crack resistance of the component. At the same time, by using the connector 2 to fixedly connect the concrete rib 1 and the concrete floor slab 3, the firmness of the prestressed concrete composite slab is further improved. In addition, by opening a hole 7 at the center position of the connector 2 of the prestressed concrete composite slab, the self-weight of the composite slab can be effectively reduced, the amount of concrete used can be reduced, and at the same time, the overall structural burden of the building can be reduced. The setting of the hole 7 can also provide convenience during the construction process, helping to hoist and position the composite slab to ensure the efficiency and safety of the construction. At the same time, the hole 7 can enhance the combination between the connector 2 and the concrete rib 1 and the concrete floor slab 3, improving the strength and overall stability of the connection, contributing to the realization of effective prestress transfer. At the same time, the hole 7 can provide convenience for the penetration and anchoring of the prestressed steel bars, making the application of prestress smoother. Opening a hole 7 at the center position of the connector 2 can also effectively reduce local stress concentration, reducing the cracking risk caused by stress concentration, and can also help the slab to have a certain degree of freedom during temperature changes, reducing the deformation and cracking of the concrete composite slab caused by temperature stress. Through the layer-by-layer reinforcement and superposition during the processing of the concrete composite slab, the double-layer prestress of the composite slab is realized, further improving the firmness of the composite slab and solving the problem of the simple structure and low firmness of the traditional prestressed concrete composite slab in the prior art.

[0024] As Figure 1 and Figures 3-5 shown, both the longitudinal prestressed steel bars 5 inside the floor slab and the transverse steel bars 6 inside the floor slab are away from the hole 8.

[0025] In this embodiment, opening holes 8 in the concrete bottom slab 3 of the prestressed concrete composite slab can reduce the amount of concrete used, thereby reducing the overall self-weight of the composite slab, lowering the structural load, and improving the economy of the building. Additionally, the holes 8 can be used for the passage and layout of wires, cables, and water supply and drainage pipes, making later construction and maintenance more convenient. The opening of the holes 8 can also help form a better connection between the concrete bottom slab 3 and the connecting member 2, optimize the force transfer, and improve the overall safety of the structure. In the prestressed concrete composite slab, the longitudinal prestressed steel bars 5 and the transverse steel bars 6 in the bottom slab are both away from the holes 8, which can reduce the risk of cracks in the composite slab caused by stress concentration, thereby enhancing the overall durability of the slab. Additionally, since both the longitudinal prestressed steel bars 5 and the transverse steel bars 6 in the bottom slab need to be anchored at appropriate positions, designing them at positions away from the holes 8 can ensure their anchoring effect and avoid poor anchoring caused by the holes 8, which may affect the prestress effect. By setting the holes 7 and the holes 8 in the same cross-section, the amount of concrete used in the concrete composite slab can be effectively reduced, thereby reducing the self-weight of the composite slab. This helps reduce the overall load of the structure and relieve the pressure on the supporting members. Additionally, setting the holes 7 and the holes 8 in the same cross-section can improve the permeability of the prestressed concrete composite slab. By opening the holes 7 and the holes 8 in the prestressed concrete composite slab, the amount of concrete used is effectively reduced, saving costs.

[0026] As Figures 1-5 shown, the top of each concrete rib 1 is 10 mm - 25 mm away from the external composite layer concrete, the thickness of each concrete rib 1 is 20 mm - 40 mm, and the spacing between every two adjacent concrete ribs 1 is an integer multiple of the spacing between every two adjacent holes 8. The connecting member 2 is a continuous bent wave shape of steel bars, steel pipes, and steel strips. The connecting member 2 is a corrugated profiled steel sheet. The connecting member 2 is a perforated concrete. The concrete rib 1 is wrapped with an open C-shaped steel. The connecting member 2 is connected to the concrete bottom slab 3 together, and the connecting member 2 passes through the external C-shaped steel and is effectively connected to the concrete rib 1 together.

[0027] In this embodiment, by wrapping the outer surface of the concrete rib 1 with an open C-shaped steel, the firmness of the concrete rib 1 can be further improved. In addition, the C-shaped steel provides additional support and strength around the concrete rib 1, improving the load-bearing capacity of the overall prestressed concrete composite slab structure. The C-shaped steel works together with the concrete, which can significantly enhance the flexural stiffness of the rib, reduce deformation. At the same time, the C-shaped steel can provide resistance to shear force, enhancing the stability of the structure. During the processing and manufacturing of the connecting frame 2, the connecting member 2 is formed by continuously bending steel bars, steel pipes and steel strips into a wavy shape, further enhancing the strength of the prestressed concrete composite slab. In addition, the wavy connecting member can effectively increase the connection strength between the composite slabs, providing better load-bearing capacity. The continuously bent wavy shape can disperse the load, making it more uniform when transferred between the slabs, thereby improving the overall flexural performance of the slab. Through the action of the connecting member 2, the strength of the prestressed concrete composite slab is further increased. In addition, by setting the distance between the concrete rib 1 and the external composite layer concrete to 10 mm - 25 mm, this spacing can be reasonably set as a construction joint to ensure that the pouring of the two parts of concrete can be effectively connected during the construction process, avoiding the generation of cold joints. During the hardening process and the service stage of the concrete, temperature changes and settlement will occur. Setting this spacing can provide a certain space to allow the deformation between the concrete rib 1 and the composite layer, preventing cracks caused by expansion and contraction.

[0028] Usage method and working principle of this device: To further improve the firmness of the prestressed concrete composite slab, first, by burying longitudinal prestressed steel bars 4 inside the concrete rib 1, the firmness of the concrete rib 1 is improved. The longitudinal prestressed steel bars 4 inside the rib are tensioned before the concrete cures. After releasing the tension, the inside of the concrete rib 1 will be maintained in a compressive stress state. This state can effectively reduce the cracks in the concrete rib 1 caused by bending and tensile stresses, improving the crack resistance of the concrete. In addition, the presence of the longitudinal prestressed steel bars 4 inside the rib can provide additional load-bearing capacity for the concrete rib 1, enabling the rib structure to more effectively distribute and resist stresses when bearing large concentrated loads and span loads, reducing the risk of its damage. By burying longitudinal prestressed steel bars 5 inside the concrete floor slab 3, the load-bearing capacity of the concrete floor slab 3 can be significantly improved, making it more stable when bearing the design load. The presence of the longitudinal prestressed steel bars 5 inside the floor slab makes a constant compressive stress state form inside the concrete floor slab 3, which can effectively inhibit the generation and expansion of cracks, improving the crack resistance of the component. By using the connector 2 to fixedly connect the concrete rib 1 and the concrete floor slab 3, opening a hole 7 at the center position of the connector 2 of the prestressed concrete composite slab can effectively reduce the self-weight of the composite slab, reduce the amount of concrete used, and at the same time reduce the overall structural burden of the building. The setting of the hole 7 can also provide convenience during the construction process, helping to hoist and position the composite slab, ensuring the efficiency and safety of the construction. The hole 7 can enhance the bonding between the connector 2 and the concrete rib 1 and the concrete floor slab 3, improving the strength and overall stability of the connection, contributing to the realization of effective prestress transfer. The hole 7 can facilitate the penetration and anchoring of the prestressed steel bars, making the application of prestress smoother. Opening a hole 7 at the center position of the connector 2 can also effectively reduce local stress concentration, reducing the cracking risk caused by stress concentration, and can also help the slab to have a certain degree of freedom during temperature changes. Through the layer-by-layer reinforcement and superposition during the processing of the prestressed concrete composite slab, the double-layer prestress of the composite slab is realized, further improving the firmness of the composite slab. Opening a hole 8 in the concrete floor slab 3 of the prestressed concrete composite slab can reduce the amount of concrete used, thereby reducing the overall self-weight of the composite slab, reducing the structural load, and improving the economy of the building. In addition, the hole 8 can be used for the crossing and layout of electric wires, cables, and water supply and drainage pipes, making the later construction and maintenance more convenient. The opening of the hole 8 can also help to form a better connection between the concrete floor slab 3 and the connector 2, optimizing the force transfer and improving the overall safety of the structure. In the prestressed concrete composite slab, both the longitudinal prestressed steel bars 5 inside the floor slab and the transverse steel bars 6 inside the floor slab are far away from the hole 8, which can reduce the risk of cracks in the composite slab caused by stress concentration, thereby enhancing the overall durability of the slab. In addition, since both the longitudinal prestressed steel bars 5 inside the floor slab and the transverse steel bars 6 inside the floor slab need to be anchored at appropriate positions, designing them at positions far away from the hole 8 can ensure their anchoring effect.To avoid poor anchoring caused by the hole 8 and affect the prestress effect, by setting the hole 7 and the hole 8 on the same cross-section, the amount of concrete in the concrete composite slab can be effectively reduced, thereby reducing the self-weight of the composite slab. This helps to reduce the overall load of the structure and relieve the pressure on the supporting members. Setting the hole 7 and the hole 8 on the same cross-section can improve the permeability of the prestressed concrete composite slab. Additionally, by opening the hole 7 and the hole 8 in the prestressed concrete composite slab. Moreover, the C-shaped steel provides additional support and strength around the concrete rib 1, improving the bearing capacity of the overall prestressed concrete composite slab structure. The C-shaped steel works together with the concrete, which can significantly enhance the flexural strength of the rib and reduce deformation. At the same time, the C-shaped steel can provide resistance to shear forces and enhance the stability of the structure. During the processing and manufacturing of the connecting frame 2, by continuously bending the steel bars, steel pipes and steel strips into a wavy shape to form the connector 2, the strength of the prestressed concrete composite slab is further enhanced. In addition, the wavy connector can effectively increase the connection strength between the composite slabs and provide better bearing capacity. The continuously bent wavy shape can disperse the load, making it more uniform when transferred between the slabs, thereby improving the overall flexural performance of the slab. Additionally, by setting the distance between the concrete rib 1 and the external composite layer concrete to 10 mm - 25 mm, this spacing can be used as a reasonable setting for the construction joint to ensure that the pouring of the two parts of concrete can be effectively connected during the construction process and avoid the generation of cold joints. The concrete will undergo temperature changes and settlement during the hardening process and the service stage. Setting this spacing can provide a certain space to allow the deformation between the concrete rib 1 and the composite layer.

[0029] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A double-layer prestressed concrete composite slab, comprising a concrete rib (1), a connecting piece (2), a concrete bottom plate (3), longitudinal prestressed steel bars (4) in the rib, longitudinal prestressed steel bars (5) in the bottom plate, and transverse steel bars (6) in the bottom plate, Features: The outer surface of the connecting member (2) is provided with a hole (7), the outer surface of the concrete bottom plate (3) is provided with an opening (8), the hole (7) and the opening (8) are located at the same cross-sectional position, the longitudinal prestressed steel bars (4) in the rib are arranged in the concrete rib (1), and the longitudinal prestressed steel bars (5) in the bottom plate are embedded in the concrete bottom plate (3).

2. The double-layer prestressed concrete composite slab according to claim 1, characterized in that: The longitudinal prestressed steel bars (5) in the bottom plate and the transverse steel bars (6) in the bottom plate are both far away from the opening (8).

3. The double-layer prestressed concrete composite slab according to claim 2 is characterized in that: The top of each concrete rib (1) is 10 mm to 25 mm away from the external overlapping layer concrete.

4. The double-layer prestressed concrete composite slab according to claim 3 is characterized in that: The thickness of each concrete rib (1) is 20 mm to 40 mm.

5. The double-layer prestressed concrete composite slab according to claim 4, characterized in that: The distance between each two adjacent concrete ribs (1) is an integer multiple of the distance between each two adjacent openings (8).

6. The double-layer prestressed concrete composite slab according to claim 5, characterized in that: The connecting piece (2) is a steel bar, a steel pipe and a steel belt that are continuously bent into a wavy shape.

7. The double-layer prestressed concrete composite slab according to claim 6, characterized in that: The connecting piece (2) is a corrugated steel plate.

8. The double-layer prestressed concrete composite slab according to claim 7, characterized in that: The connecting piece (2) is made of perforated concrete.

9. The double-layer prestressed concrete composite slab according to claim 8, characterized in that: The concrete rib (1) is covered with an open C-shaped steel, and the connecting piece (2) is connected to the concrete bottom plate (3).

10. The double-layer prestressed concrete composite slab according to claim 9, characterized in that: The connecting piece (2) passes through the external C-shaped steel and is effectively connected with the concrete rib (1).

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