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 corresponding positions of the connecting pieces and the bottom plate. According to the double-layer prestressed concrete laminated slab, in order to better exert the effect of prestressed high-strength steel bars, the prestressed steel bars are laid in the concrete bottom plate and the concrete ribs, and the holes are formed in the bottom plate at the position of the span beam support and the connecting position, so that the prestress of the laminated slab bears sagging moment steel bars and also bears hogging moment; therefore, steel is saved, the rigidity of the prestressed laminated slab is improved, and the support-free span distance of the laminated slab is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of composite slabs, in particular to a double-layer prestressed concrete composite slab. Background Art

[0002] Prestressed concrete composite slabs are structural materials that improve their bearing capacity and crack resistance by stacking multiple concrete slabs together and applying prestress. They are a type of composite material mainly used in buildings, bridges and other large structures. Before the concrete is poured, tension is applied to the prestressed steel bars so that the concrete can withstand greater external loads after curing. Prestressing can effectively reduce cracks in the concrete during use, reduce the amount of steel used, and improve its durability and service life.

[0003] Currently, most prestressed concrete composite slabs are single-layer slabs, with only one layer of concrete and prestressed steel bars. Their structure is simple, and the prestressed steel bars can only withstand the positive bending moment of the composite slab. The negative bending moment steel bars can only rely on ordinary steel bars to withstand, and the high strength of the prestressed steel bars cannot be fully utilized. Most of the existing composite slabs are continuous slabs or multilateral fixed slabs. The negative bending moment of the floor slab is often greater than the positive bending moment, and more steel bars are required. There are also many buildings that are very long, and ordinary steel bars are used on the upper surface. The temperature crack control of super-long buildings is very poor.

[0004] Some technologies also propose the use of double-layer prestressing, which only uses the upper prestressing to balance the anti-arch generated by the lower prestressing. The upper prestressing is far away from the top layer of the overlapping surface, and there is no mention of how to make the upper prestressing withstand the negative bending moment and temperature stress of super-long buildings.

[0005] With existing technology, prestressed composite slabs can achieve large spans without support, but due to the discreteness of concrete, the deformation difference between the composite slabs is often difficult to control, resulting in height differences between the joints after the composite slab construction is completed.

[0006] Therefore, we proposed a double-layer prestressed concrete composite slab to solve the above problems. Summary of the Invention

[0007] The object of the present invention is to provide a double-layer prestressed concrete composite slab to solve the problem of the traditional prestressed concrete composite slab having a simple structure and low firmness proposed in the above background art.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solution: a double-layer prestressed concrete composite slab, comprising concrete ribs, connecting pieces, a concrete base plate, longitudinal prestressed steel bars in the ribs, longitudinal prestressed steel bars in the base plate, and transverse steel bars in the base plate, wherein the connecting pieces are provided with holes, and the concrete base plate is provided with openings, wherein the holes and the openings are located at the same cross-sectional position, the longitudinal prestressed steel bars in the ribs are arranged in the concrete ribs, and the longitudinal prestressed steel bars in the base plate are embedded in the concrete base plate.

[0009] Preferably, the distance between the top surface of each concrete rib and the concrete surface of the superimposed layer is 10 mm to 25 mm.

[0010] Preferably, the thickness of each of the concrete ribs is 20 mm to 40 mm.

[0011] Preferably, the longitudinal prestressed steel bars in the bottom plate and the transverse steel bars in the bottom plate avoid the opening.

[0012] Preferably, a beam body is placed below the opening, and stirrups in the beam pass through the opening.

[0013] Preferably, there is a longitudinal steel bar in the hole, the longitudinal steel bar passes through the top surface of the hole, and the longitudinal steel bar passes through the stirrups in the beam.

[0014] Preferably, the distance between every two adjacent concrete ribs is an integer multiple of the distance between every two adjacent openings.

[0015] Preferably, the connecting piece is a steel bar, a steel pipe or a steel belt that is continuously bent into a wavy shape.

[0016] Preferably, the connecting piece is a corrugated steel plate.

[0017] Preferably, the concrete rib is covered with an open C-shaped steel, the connecting piece is connected to the concrete bottom plate, and the connecting piece passes through the external C-shaped steel to be effectively connected with the concrete rib.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. In order to give full play to the role of prestressed steel bars in structural stress, double-layer prestressed steel bars are used, that is, prestressed steel bars are set in the concrete base plate and the reinforcing ribs. In order to allow the prestressed steel bars in the ribs to play a structural stress role, the height of the ribs and the distance between the ribs and the top surface of the composite layer are controlled. In structural stress, in multi-span continuous plates, the negative bending moment is often larger than the positive bending moment, and the prestressed force of traditional prestressed composite plates can only withstand positive bending moment, not negative bending moment. Negative bending moment can only be treated by post-laid non-prestressed steel bars, which cannot fully play the role of prestressed high-strength steel bars. Therefore, this technology can achieve more material savings and reduce the use of steel.

[0020] 2. This technology realizes prestressed span beams. The stirrups in the beams pass through the bottom of the slab, and the longitudinal reinforcement on the upper part of the beams passes through the holes in the connectors, allowing the beams and slabs to be better combined together. The beams serve as the intermediate supports of the prestressed slabs, effectively adjusting the flatness of the bottom surface of the composite slab.

[0021] 3. This technology uses double-layer prestressed span beam plates. Compared with the existing technology, which mostly uses single-layer prestressed composite plates with simple support, the composite plates have greater stiffness and bearing capacity.

[0022] 4. This technology adopts double-layer prestressing, and the prestressed steel bars in the ribs are closer to the upper surface of the superimposed layer. In super-long buildings, it has a stronger ability to resist structural temperature stress, increases the length of the temperature seam of the structure, and reduces the amount of ordinary steel bars used.

[0023] 5. By wrapping the outer surface of the concrete rib with open C-shaped steel, the firmness of the concrete rib can be further improved. During the processing and manufacturing of the connecting parts, the steel bars, steel pipes or steel strips are continuously bent into a wave shape to form the connecting parts, which further enhances the strength of the prestressed concrete composite slab and forms a stable composite component with the bottom plate, steel and ribs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front view of a double-layer prestressed concrete composite slab of the present invention;

[0025] Figure 2 A plan view of a double-layer prestressed concrete composite slab according to the present invention;

[0026] Figure 3 This is a partial plan view of the longitudinal prestressed steel bars in the bottom plate of a double-layer prestressed concrete composite slab of the present invention;

[0027] Figure 4 This is a cross-sectional view of a double-layer prestressed concrete composite slab of the present invention (where the bottom slab has an opening);

[0028] Figure 5 This is a cross-sectional view of a double-layer prestressed concrete composite slab of the present invention (without openings in the bottom slab);

[0029] Figure 6 The present invention is a three-dimensional double-layer prestressed concrete composite slab Figure 1 (concrete ribs, steel belt connectors);

[0030] Figure 7 The present invention is a three-dimensional rib of a double-layer prestressed concrete composite plate Figure 1 (Concrete ribs are wrapped by C-shaped steel and connected by steel strips);

[0031] Figure 8 The present invention is a three-dimensional double-layer prestressed concrete composite slab Figure 2 (concrete ribs wrapped by C-shaped steel, steel belt connectors, span beams);

[0032] Figure 9 The present invention is a three-dimensional double-layer prestressed concrete composite slab Figure 3 (The connecting parts are corrugated steel plates);

[0033] Figure 10 The present invention is a three-dimensional double-layer prestressed concrete composite slab Figure 4 (The connecting parts are corrugated steel plates and span beams).

[0034] In the picture:

[0035] 1. Concrete ribs; 2. Connectors; 3. Concrete base plate; 4. Longitudinal prestressed steel bars in the ribs; 5. Longitudinal prestressed steel bars in the base plate; 6. Transverse steel bars in the base plate; 7. Holes; 8. Openings; 9. Beam body; 10. Stirrups in the beam; 11. Longitudinal steel bars. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] See also Figures 1-10 The present invention provides a technical solution: a double-layer prestressed concrete composite slab, including 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. The connecting piece 2 is provided with a hole 7, and the concrete bottom plate 3 is provided with an opening 8. The hole 7 and the opening 8 are 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 buried in the concrete bottom plate 3. The distance between the top surface of each concrete rib 1 and the concrete surface of the composite layer is 10mm-25mm, and the thickness of each concrete rib 1 is 20mm-40mm.

[0038] In this embodiment, in order to give full play to the role of prestressed steel bars in structural stress, this scheme adopts double-layer prestressed steel bars, and longitudinal prestressed steel bars 5 are set in the concrete bottom plate 3, and longitudinal prestressed steel bars 4 are set in the ribs 1. In order to allow the longitudinal prestressed steel bars 4 in the ribs to play a structural stress role, the distance between the top surface of each concrete rib 1 and the concrete surface of the superimposed layer is set to 10mm-25mm by controlling the height of the ribs and the distance between the ribs and the top surface of the superimposed layer. In structural stress, in multi-span continuous plates, negative bending moment is often larger than positive bending moment, and the prestress of traditional prestressed superimposed plates can only withstand Positive bending moment, cannot withstand negative bending moment, negative bending moment can only be handled by post-laid non-prestressed steel bars, thus unable to fully play the role of prestressed high-strength steel bars, the present invention improves the strength of the prestressed composite slab to cope with external forces by setting longitudinal prestressed steel bars 5 in the bottom plate and longitudinal prestressed steel bars 4 in the ribs, and enables it to fully play the high-strength role of prestressed high-strength steel bars, and requires less steel bars, so that the technology can achieve more material savings and reduce the use of steel, solving the problem in the existing technology that the steel bars in most traditional concrete composite slabs cannot play the high-strength role of field steel bars, resulting in the need for more steel materials to increase the use of steel.

[0039] like Figures 1-10 As shown, the longitudinal prestressed steel bars 5 and the transverse steel bars 6 in the bottom plate avoid the opening 8. A beam body 9 is placed below the opening 8. The stirrups 10 in the beam pass through the opening 8. There are longitudinal steel bars 11 in the hole 7. The longitudinal steel bars 11 pass through the top surface of the hole 7 and pass through the stirrups 10 in the beam.

[0040] In this embodiment, in order to ensure the flatness of the bottom surface of the concrete composite slab, the prestressed span beam and the stirrups 10 in the beam are respectively passed through the bottom of the slab, and the longitudinal steel bars 11 on the upper part of the beam are passed through the holes 7 of the connecting piece 2, so as to achieve a better combination of the beam and the slab. The beam serves as the intermediate support of the prestressed slab, which effectively adjusts the flatness of the bottom surface of the composite slab, thereby improving the aesthetics of the bottom surface of the concrete composite slab. In addition, by adopting a double-layer prestressed span beam slab, the prefabricated components of the concrete composite slab made of the double-layer prestressed span beam slab have greater stiffness and bearing capacity than the existing technology which mostly adopts a single-layer prestressed composite slab that is simply supported. By adopting double-layer prestressing, the prestressed steel bars in the ribs are closer to the upper surface of the composite layer, so in super-long buildings, it has a stronger ability to resist structural temperature stress, increases the length of the temperature seam of the structure, reduces the amount of ordinary steel bars used, and further saves resources.

[0041] like Figures 1-10As shown, the spacing between every two adjacent concrete ribs 1 is an integer multiple of the spacing between every two adjacent openings 8, the connector 2 is a steel bar, steel pipe or steel belt continuously bent into a wavy shape, the connector 2 is a wavy corrugated steel plate, the connector 2 is a perforated concrete, the concrete rib 1 is wrapped with an open C-shaped steel, the connector 2 is connected to the concrete base plate 3, and the connector 2 passes through the external C-shaped steel to effectively connect with the concrete rib 1.

[0042] In this embodiment, the outer surface of the concrete rib 1 is wrapped with an open C-shaped steel, and the connector 2 is passed through the external C-shaped steel to effectively connect with the concrete rib 1, and the connector 2 is connected with the concrete base plate 3, thereby further improving the firmness of the concrete rib 1. During the processing and manufacturing process of the connector 2, the connector is processed into a wave shape by continuously bending steel bars, steel pipes or steel strips, thereby 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.

[0043] 6. Usage and working principle of this device: In order to give full play to the role of prestressed steel bars in structural stress, this solution adopts double-layer prestressed steel bars. The longitudinal prestressed steel bars 5 in the bottom plate are set in the concrete bottom plate 3, and the longitudinal prestressed steel bars 4 in the ribs are set in the concrete ribs 1. In order to allow the longitudinal prestressed steel bars 4 in the ribs to play a structural stress role, the distance between the top surface of each concrete rib 1 and the concrete surface of the superimposed layer is set to 10mm-25mm by controlling the height of the ribs and the distance between the ribs and the top surface of the superimposed layer. In structural stress, in multi-span continuous plates, the negative bending moment is often larger than the positive bending moment, and the prestressed moment of traditional prestressed superimposed plates is larger than the positive bending moment. It can only withstand positive bending moments, but not negative bending moments. Negative bending moments can only be treated by using non-prestressed steel bars laid later, which cannot fully play the role of prestressed high-strength steel bars. The present invention improves the strength of the prestressed composite slab to cope with external forces by setting longitudinal prestressed steel bars 5 in the bottom plate and longitudinal prestressed steel bars 4 in the ribs, and at the same time enables it to fully play the high-strength role of prestressed high-strength steel bars, and requires less steel bars, so that this technology can achieve more material savings and reduce the use of steel, solving the problem that the steel bars in most traditional concrete composite slabs in the prior art cannot play the high-strength role of field steel bars, resulting in the need for more steel materials to increase the use of steel. To ensure the flatness of the surface of the concrete composite slab, the prestressed span beam and the stirrups 10 in the beam are respectively passed through the bottom of the slab, and the longitudinal reinforcement 11 on the upper part of the beam is passed through the holes 7 of the connector 2, so that the beam and the slab are better combined together. The beam serves as the intermediate support of the prestressed slab, which effectively adjusts the flatness of the bottom surface of the composite slab, thereby improving the aesthetics of the surface of the concrete composite slab. In addition, by adopting a double-layer prestressed span beam slab, compared with the existing technology that is mostly a single-layer prestressed composite slab simply supported, the concrete composite slab prefabricated component made of the double-layer prestressed span beam slab has greater stiffness and bearing capacity. By adopting double-layer prestressing, the prestressed steel bars in the ribs are closer to the upper surface of the composite layer. In super-long buildings, it has a stronger ability to resist structural temperature stress, increases the length of the temperature seam of the structure, reduces the amount of ordinary steel bars used, and further saves resources. By wrapping the open C-shaped steel on the outer surface of the concrete rib 1, and effectively connecting the connector 2 through the external C-shaped steel with the concrete rib 1, and the connector 2 is connected to the concrete base plate 3, the firmness of the concrete rib 1 is further improved. During the processing of the connector 2, the steel bar or steel pipe or steel belt is continuously bent into a wave shape to form the connector, which further enhances the strength of the prestressed concrete composite slab and forms a stable composite component with the base plate, steel section and rib.

[0044] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-layer prestressed concrete composite slab, comprising concrete ribs (1), connectors (2), a concrete base plate (3), longitudinal prestressed steel bars (4) in the ribs, longitudinal prestressed steel bars (5) in the base plate, and transverse steel bars (6) in the base plate. Its characteristics are: The connecting member (2) is provided with a hole (7), and the concrete base plate (3) is provided with an opening (8), wherein 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 base plate are embedded in the concrete base plate (3).

2. The double-layer prestressed concrete composite slab according to claim 1, characterized in that: The distance between the top surface of each concrete rib (1) and the concrete surface of the superimposed layer is 10mm-25mm.

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

4. 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 arranged to avoid the opening (8).

5. The double-layer prestressed concrete composite slab according to claim 1, characterized in that: A beam body (9) is placed below the opening (8), and the internal stirrups (10) of the beam pass through the opening (8).

6. The double-layer prestressed concrete composite slab according to claim 5, characterized in that: A longitudinal steel bar (11) is provided in the hole (7), the longitudinal steel bar (11) passes through the top surface of the hole (7), and the longitudinal steel bar (11) passes through the stirrups (10) in the beam.

7. The double-layer prestressed concrete composite slab according to claim 1, 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).

8. The double-layer prestressed concrete composite slab according to claim 1, characterized in that: The connecting piece (2) is a steel bar, a steel pipe or a steel strip that is continuously bent into a wavy shape.

9. The double-layer prestressed concrete composite slab according to claim 1, characterized in that: The connecting piece (2) is a corrugated steel plate.

10. The double-layer prestressed concrete composite slab according to claim 1, characterized in that: The concrete rib (1) is covered with an open C-shaped steel, the connecting piece (2) is connected to the concrete base plate (3), and the connecting piece (2) passes through the external C-shaped steel to be effectively connected to the concrete rib (1).

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