Prefabricated concrete laminated slab with plane steel bar trusses

Abstract

The utility model discloses a precast concrete laminated slab with plane steel bar trusses, which comprises a precast concrete bottom slab and a plurality of plane steel bar trusses arranged on the precast concrete bottom slab at intervals along the width direction of the precast concrete bottom slab, and the lower ends of the plane steel bar trusses are pre-buried in the precast concrete bottom slab. The upper ends of the plurality of plane steel bar trusses are connected into a whole through a transverse steel bar group which is vertically orthogonal to the length direction of the precast concrete bottom plate, and the transverse steel bar group is composed of a plurality of transverse steel bars which are uniformly arranged at intervals; the prefabricated concrete laminated slab with the plane steel bar trusses is high in rigidity, good in quality, high in efficiency and low in cost, and effectively avoids the problem that the bottom plate of the concrete laminated slab cracks in the hoisting and construction installation processes; and the longitudinal steel bars of the plane steel bar truss can be fully utilized in various stages of production, hoisting, construction installation and use.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled building floor slabs, in particular to a prefabricated concrete composite slab with a plane steel bar truss. Background Art

[0002] The composite slab is an assembled integral floor slab made of precast slabs and cast-in-place reinforced concrete layers. The composite slab has good integrity, and the upper and lower surfaces of the slab are flat, which is convenient for finishing layer decoration. It is suitable for high-rise buildings and large-span buildings with high requirements for overall rigidity. Existing precast concrete composite slabs are usually pre-embedded with triangular structural steel trusses, but due to the large spacing between adjacent triangular steel trusses, it is necessary to lay templates and set up scaffolding throughout the construction, and the degree of assembly construction is not high. At the same time, there is a lack of connection structure between adjacent triangular steel trusses, which leads to cracking of the bottom plate of the precast concrete composite slab during the lifting and construction and installation process.

[0003] Therefore, in order to solve the above problems, it is necessary to improve the existing precast concrete composite slab structure so that the composite slab can be free of support and formwork in the middle of the span or with less support and formwork during the construction process. Utility Model Content

[0004] In view of this, the precast concrete composite slab with plane steel trusses provided by the utility model uses plane steel trusses instead of traditional triangular steel trusses on the precast concrete bottom plate, so that the steel trusses are arranged more tightly, so as to realize support-free, formwork-free or less support and less formwork construction in the mid-span; at the same time, transverse steel bars are arranged between the plane steel trusses as out-of-plane supports for the upper chord steel bars of the plane trusses, so that the upper chord steel bars of the plane trusses are connected to form a whole, thereby improving the overall force-bearing performance of the precast bottom plate, so as to avoid the problem of cracking of the bottom plate of the precast concrete composite slab during lifting and construction and installation.

[0005] The utility model provides a precast concrete composite slab with a plane steel bar truss, comprising a precast concrete bottom plate and a plurality of plane steel bar trusses arranged on the precast concrete bottom plate at intervals along the width direction of the precast concrete bottom plate, the lower ends of the plane steel bar trusses are pre-embedded in the precast concrete bottom plate, the upper ends of the plurality of plane steel bar trusses are connected to form a whole through a transverse steel bar group arranged perpendicularly and orthogonally to the length direction of the precast concrete bottom plate, and the transverse steel bar group is composed of a plurality of transverse steel bars arranged at even intervals.

[0006] Furthermore, the plane steel truss includes a lower chord steel bar embedded in the precast concrete base plate, an upper chord steel bar arranged above the precast concrete base plate, and a web steel bar for connecting the lower chord steel bar and the upper chord steel bar, and the lower chord steel bar, the upper chord steel bar and the web steel bar are located on the same vertical plane.

[0007] Furthermore, the transverse steel bars are arranged vertically and orthogonally on the upper part or the lower part of the upper chord steel bars.

[0008] Furthermore, the web reinforcement is arranged in a wave shape between the upper chord reinforcement and the lower chord reinforcement.

[0009] Furthermore, it also includes transverse reinforcement bars of the bottom plate embedded in the precast concrete bottom plate, and the transverse reinforcement bars of the bottom plate are perpendicular to the length direction of the bottom chord reinforcement bars and are arranged on the upper part or the lower part of the bottom chord reinforcement bars.

[0010] Furthermore, the lower chord steel bars of the planar steel bar truss may have both ends not extending out of the precast concrete bottom plate, one end extending out of the precast concrete bottom plate and the other end not extending out of the precast concrete bottom plate, or both ends extending out of the precast concrete bottom plate.

[0011] Furthermore, ends of the transverse reinforcements of the bottom plate extend out of or do not extend out of the precast concrete bottom plate.

[0012] The beneficial effects of the utility model: the precast concrete composite slab with plane steel bar truss of the utility model has high rigidity, good quality, high efficiency and low cost, and can effectively avoid the problem of cracking of the bottom plate of the concrete composite slab during lifting and construction and installation. The longitudinal steel bars of the plane steel bar truss can be fully utilized in each stage of production, lifting, construction and installation as well as use, and can realize support-free, formwork-free or less support and less formwork construction in the mid-span. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0014] Figure 1 It is a structural schematic diagram of a precast concrete composite slab with a plane steel bar truss in the utility model;

[0015] Figure 2 for Figure 1 AA section view in;

[0016] Figure 3 for Figure 1 BB section view in;

[0017] Figure 4 It is a structural schematic diagram of another type of precast concrete composite slab with a plane steel bar truss in the utility model;

[0018] Figure 5 for Figure 4 CC section view in;

[0019] In the figure: 1- plane steel bar truss; 2- transverse steel bar; 3- precast concrete bottom plate; 4- lower chord steel bar; 5- upper chord steel bar; 6- web bar steel bar; 7- bottom plate transverse steel bar. DETAILED DESCRIPTION

[0020] As shown in the figure, the utility model provides a precast concrete composite slab with a plane steel bar truss, comprising a precast concrete bottom plate 3 and a plurality of plane steel bar trusses 1 arranged on the precast concrete bottom plate 3 at intervals along the width direction of the precast concrete bottom plate, the lower end of the plane steel bar truss 1 is pre-buried in the precast concrete bottom plate 3, and the upper ends of the plurality of plane steel bar trusses 1 are connected to form a whole through a transverse steel bar group arranged perpendicularly and orthogonally to the length direction of the precast concrete bottom plate 3, and the transverse steel bar group is composed of a plurality of transverse steel bars 2 arranged at uniform intervals; wherein when the precast concrete composite slab is designed, the thickness, width, length, and plane of the precast concrete bottom plate 3 are The spacing between the surface steel trusses, the spacing between the transverse steel bars, and the specific steel bar diameters are determined according to design requirements; by using plane steel trusses instead of traditional triangular steel trusses, the plane steel trusses are arranged more tightly, so that the precast concrete composite slab has greater rigidity, better quality, higher efficiency, and lower cost, so as to achieve mid-span support-free, formwork-free, or less support and less formwork construction; at the same time, transverse steel bars 2 are arranged between the plane steel trusses 1, which effectively avoids the problem of cracking of the bottom plate of the concrete composite slab during the lifting and construction and installation process, and the longitudinal steel bars of the plane steel trusses can be fully utilized in each stage of production, lifting, construction and installation, and use.

[0021] In this embodiment, the plane steel bar truss 1 includes a lower chord steel bar 4 embedded in the precast concrete base plate 3, an upper chord steel bar 5 arranged above the precast concrete base plate 3, and a web bar steel bar 6 for connecting the lower chord steel bar 4 and the upper chord steel bar 5, wherein the lower chord steel bar 4, the upper chord steel bar 5 and the web bar steel bar 6 are located on the same vertical plane; the transverse steel bar 2 is vertically orthogonally arranged at the upper or lower part of the upper chord steel bar 5; the web bar steel bar 6 is arranged in a wave shape between the upper chord steel bar 5 and the lower chord steel bar 4; Figures 1 to 3 As shown, the plane steel bar truss 1 is composed of a lower chord steel bar 4, an upper chord steel bar 5 and a web bar 6 located in the same vertical plane. The web bar 6 is arranged in a wave shape between the upper chord steel bar 5 and the lower chord steel bar 4 to ensure the connection strength between the upper chord steel bar 5 and the lower chord steel bar 4, while strengthening the overall strength of the plane steel bar truss 1. Compared with the traditional triangular steel bar truss precast concrete composite slab, the precast concrete composite slab with plane steel bar truss has a smaller spacing between adjacent trusses and a denser arrangement of trusses, which can reduce the arrangement of formwork and support when the precast concrete composite slab is in use.

[0022] In this embodiment, it also includes a bottom plate transverse steel bar 7 embedded in the precast concrete bottom plate 3, and the bottom plate transverse steel bar 7 is perpendicular to the length direction of the lower chord steel bar 4 and is arranged on the upper or lower part of the lower chord steel bar 4; wherein the bottom plate transverse steel bar 7 is tightly attached to the lower chord steel bar 4 and is fixed by binding or welding.

[0023] In this embodiment, the lower chord steel bars 4 of the plane steel bar truss may not extend out of the precast concrete bottom plate 3 at both ends, or extend out of the precast concrete bottom plate 3 at one end and not extend out of the precast concrete bottom plate 3 at the other end, or extend out of the precast concrete bottom plate 3 at both ends; the ends of the bottom plate transverse steel bars 7 extend out of the precast concrete bottom plate 3 or not; whether the lower chord steel bars 4 of the plane steel bar truss 1 are protruded is selected and determined according to the specific usage conditions, and the bottom plate transverse steel bars 7 may be protruded or not, which is also selected according to the specific usage conditions. Figure 1 It is a structural schematic diagram of a precast concrete composite slab with a plane steel bar truss when the bottom slab transverse steel bar 7 is not provided. Figure 4 It is a structural schematic diagram of a precast concrete composite slab with a plane steel bar truss when the bottom plate transverse steel bars 7 are extended; it can be seen that the composite slab can be made into either a one-way slab or a two-way slab, and can be used in actual projects to achieve support-free, formwork-free or less formwork in the mid-span of the composite floor.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A precast concrete composite slab with a plane steel bar truss, characterized in that: It comprises a precast concrete base plate and a plurality of plane steel bar trusses arranged on the precast concrete base plate at intervals along the width direction of the precast concrete base plate, wherein the lower ends of the plane steel bar trusses are embedded in the precast concrete base plate, and the upper ends of the plurality of plane steel bar trusses are connected to form a whole through a transverse steel bar group arranged perpendicularly and orthogonally to the length direction of the precast concrete base plate, and the transverse steel bar group is composed of a plurality of transverse steel bars arranged evenly spaced.

2. The precast concrete composite slab with planar steel bar trusses according to claim 1, characterized in that: The plane steel bar truss includes a lower chord steel bar embedded in the precast concrete base plate, an upper chord steel bar arranged above the precast concrete base plate, and a web bar steel bar used to connect the lower chord steel bar and the upper chord steel bar. The lower chord steel bar, the upper chord steel bar and the web bar steel bar are located on the same vertical plane.

3. The precast concrete composite slab with planar steel bar trusses according to claim 2, characterized in that: The transverse reinforcement is vertically and orthogonally arranged on the upper part or the lower part of the upper chord reinforcement.

4. The precast concrete composite slab with planar steel bar trusses according to claim 2, characterized in that: The web reinforcement is arranged in a wave shape between the upper chord reinforcement and the lower chord reinforcement.

5. The precast concrete composite slab with planar steel bar trusses according to claim 2, characterized in that: It also includes bottom plate transverse reinforcement embedded in the precast concrete bottom plate, and the bottom plate transverse reinforcement is perpendicular to the length direction of the lower chord reinforcement and is arranged on the upper part or the lower part of the lower chord reinforcement.

6. The precast concrete composite slab with planar steel bar trusses according to claim 5, characterized in that: The lower chord steel bars of the plane steel bar truss may not extend out of the precast concrete bottom plate at both ends, one end may extend out of the precast concrete bottom plate and the other end may not extend out of the precast concrete bottom plate, or both ends may extend out of the precast concrete bottom plate.

7. The precast concrete composite slab with planar steel bar trusses according to claim 5, characterized in that: The ends of the transverse reinforcements of the bottom plate extend out of or do not extend out of the precast concrete bottom plate.

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