A combined prestressed composite floor slab

Abstract

The present invention discloses a combined prestressed composite floor slab, comprising a bottom plate and a compression rib, wherein the compression rib is in the shape of a long strip, and a plurality of compression ribs are arranged in parallel on the bottom plate, and the compression rib is provided with a plurality of sets of anchoring steel bars at intervals along the length direction, and each set of anchoring steel bars has two sets of anchoring steel bars, which are symmetrically arranged on both sides of the compression rib, and one end of the anchoring steel bar is embedded in the compression rib, and the other end is fixedly connected to the bottom plate by secondary pouring. The present invention reduces the amount of building materials and reduces the cost while ensuring the tensile strength and compressive strength.

Description

Technical Field

[0001] The invention relates to the field of construction, in particular to a combined prestressed composite floor slab. Background Art

[0002] At present, most of the existing composite floor slabs use reinforced truss composite slabs, which have obvious defects: 1. The minimum thickness of the concrete base plate is 60mm, which is heavy and expensive; 2. The crack resistance is low and it is easy to crack or break during transportation and lifting.

[0003] It can be seen that the above existing composite floor slabs still have inconveniences and defects in structure and use, and are in urgent need of further improvement. How to create a new modular prestressed composite floor slab is one of the current important research and development topics. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a combined prestressed composite floor slab, which not only reduces the material consumption but also increases the overall crack resistance of the component, reduces the production and transportation costs, thereby overcoming the shortcomings of the existing composite floor slabs.

[0005] In order to solve the above technical problems, the present invention provides a combined prestressed composite floor slab, including a base plate and compression ribs, the compression ribs are in the shape of long strips, and several compression ribs are arranged in parallel on the base plate. The compression ribs are arranged with a plurality of groups of anchor steel bars at intervals along the length direction, and the number of each group of anchor steel bars is two, which are symmetrically arranged on both sides of the compression ribs. One end of the anchor steel bar is embedded in the compression rib, and the other end is fixedly connected to the base plate through secondary casting.

[0006] As an improvement of the present invention, prestressed steel wires are arranged in the base plate.

[0007] Furthermore, the tensile strength of the prestressed steel wire is 1570 MPa or above.

[0008] Furthermore, a plurality of through-going trapezoidal holes are arranged at equal intervals along the length direction on the side wall of the compression rib for passing the pipe.

[0009] Furthermore, the opening size and spacing size of the trapezoidal holes are modularized.

[0010] Furthermore, the anchor steel bars are enclosed in a rectangular ring, and are bent 90° in the middle of the rectangular ring so that the upper half of the rectangular ring is vertical and the lower half is horizontal. The upper half of the anchor steel bars are embedded in the compression ribs, and the lower half is embedded in the bottom plate, thereby achieving a fixed connection between the compression ribs and the bottom plate.

[0011] Furthermore, the anchor steel bars are arranged at a spacing of 300 mm along the longitudinal direction of the compression rib.

[0012] Furthermore, the compression ribs are prefabricated with high-strength concrete having a compressive strength grade of C60 or above.

[0013] Furthermore, the thickness of the bottom plate is 30 mm to 35 mm.

[0014] After adopting such a design, the present invention has at least the following advantages:

[0015] 1. Compared with traditional reinforced truss composite floor, the thickness of the bottom plate is smaller, the amount of concrete used in the components is reduced by 29%, and the amount of steel bars is reduced by 10%, which saves the use of building materials and reduces production costs;

[0016] 2. During on-site construction, the overall thickness of the traditional reinforced truss composite floor is 60mm for the bottom plate + 70mm for on-site post-casting, while the bottom plate of the present invention is 35mm + 85mm for on-site post-casting, and the total thickness of the floor is reduced by 10mm, which can reduce the seismic force and foundation cost of the building;

[0017] 3. The weight of components is reduced by 29%, which reduces transportation costs and carbon emissions, and reduces the workload of tower cranes on construction sites;

[0018] 4. The rigidity is 6.6% higher than that of the commonly used reinforced truss composite panels, and the crack resistance is much better than that of ordinary composite panels. No cracks will occur during transportation and on-site use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Figure 1 It is a transverse cross-sectional view of a combined prestressed composite floor slab provided by the present invention.

[0021] Figure 2 It is a longitudinal cross-sectional view of a combined prestressed composite floor slab provided by the present invention.

[0022] Explanation of the reference numerals: 1- bottom plate; 2- compression rib; 3- anchoring steel bar; 4- high-strength prestressed steel wire; 5- trapezoidal hole; 6- electric pipe. DETAILED DESCRIPTION

[0023] See also Figure 1 and Figure 2 The present invention provides a combined prestressed composite floor slab, including a bottom plate 1 and a compression rib 2. The compression rib 2 is prefabricated first, then cut into a required length, and then combined with the bottom plate 1.

[0024] The bottom plate 1 is in the shape of a flat plate, and a high-strength prestressed steel wire 4 with a tensile strength of 1570 MPa or above is arranged inside the bottom plate 1 to play a tensile resistance role.

[0025] Preferably, the thickness of the bottom plate 1 is 30 mm to 35 mm.

[0026] A plurality of compression ribs 2 are arranged above the bottom plate 1. The compression ribs 2 are in the shape of long strips and are arranged in parallel. A plurality of laterally penetrating trapezoidal holes 5 are evenly spaced along the length direction on each compression rib 2, which are reserved through-holes for the electric pipes 6. A plurality of groups of anchoring steel bars 3 are arranged at intervals along the length direction on each compression rib 2. The number of each group of anchoring steel bars 3 is two, which are symmetrically arranged on both sides of the compression rib 2.

[0027] Preferably, the compression ribs 2 are prefabricated with high-strength concrete having a compressive strength grade of C60 or above, and have higher compressive strength than traditional composite floors.

[0028] Preferably, the opening size and spacing size of the trapezoidal holes 5 are modularized, which is more suitable for combination with base plates 1 of different spans, and is also convenient for the overall arrangement of the electric pipes 6 in the later construction.

[0029] The anchoring steel bar 3 is a rectangular ring body surrounded by steel bars. After being bent 90° in the middle of the rectangular ring, the upper half of the anchoring steel bar 3 is vertical and the lower half is horizontal. The upper half of the anchoring steel bar 3 is embedded in the compression rib 2, and the lower half of the anchoring steel bar 3 is embedded in the bottom plate 1 through secondary casting, so as to achieve a fixed connection between the bottom plate 1 and the compression rib 2.

[0030] Preferably, the anchor steel bars 3 are arranged at a spacing of 300 mm along the longitudinal direction of the compression rib 2 .

[0031] Compared with traditional composite floors, the combined prestressed composite floor provided by the present invention ensures tensile strength and compressive strength through the high-strength prestressed steel wires 4 and the compression ribs 2 in the bottom plate 1, while reducing the thickness of the bottom plate 1, reducing the amount of concrete by 29%, reducing the amount of steel bars by 10%, and reducing the overall weight by 29%, thereby saving building materials and reducing costs.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which all fall within the protection scope of the present invention.

Claims

1. A combined prestressed composite floor slab, characterized in that: It includes a bottom plate and a compression rib, wherein the compression rib is in the shape of a long strip, and a plurality of compression ribs are arranged in parallel on the bottom plate, and a plurality of groups of anchor steel bars are arranged at intervals along the length direction of the compression rib, and each group of anchor steel bars has two anchor steel bars, which are symmetrically arranged on both sides of the compression rib, and one end of the anchor steel bar is embedded in the compression rib, and the other end is fixedly connected to the bottom plate through secondary pouring; The side wall of the compression rib is provided with a plurality of through-going trapezoidal holes at equal intervals along the length direction for passing the pipe; The opening size and spacing size of the trapezoidal holes are modularized; The anchor steel bar is enclosed in a rectangular ring shape, and is bent 90 degrees in the middle of the rectangular ring so that the upper half of the rectangular ring is vertical and the lower half is horizontal. The upper half of the anchor steel bar is embedded in the compression rib, and the lower half is embedded in the bottom plate, so that the compression rib and the bottom plate are fixedly connected; The compression ribs are prefabricated with high-strength concrete with a compressive strength grade of C60 or above.

2. A combined prestressed composite floor slab according to claim 1, characterized in that: Prestressed steel wires are arranged in the bottom plate.

3. A combined prestressed composite floor slab according to claim 2, characterized in that: The tensile strength of the prestressed steel wire is 1570 MPa or above.

4. The combined prestressed composite floor slab according to claim 1, characterized in that: The anchor steel bars are arranged at a spacing of 300 mm along the longitudinal direction of the compression rib.

5. The combined prestressed composite floor slab according to claim 1, characterized in that: The thickness of the bottom plate is 30 mm to 35 mm.

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