Prefabricated reinforced concrete composite slab based on cold-formed steel skeleton and its preparation method

Abstract

The present invention discloses a precast reinforced concrete composite slab based on a cold-formed steel skeleton and a preparation method thereof, including: a cold-formed steel frame, a steel mesh, a concrete slab, and a plurality of metal clips; one end of each of the metal clips is used to fix the steel mesh, and the other end is clamped into the cold-formed steel frame; the steel mesh, the metal clips, and one side of the cold-formed steel frame connected to the metal clips are embedded in the concrete slab; the metal clip includes a first end with elastic expansion ability and a second end with elastic expansion ability; the first end is used to fix the steel mesh, and the first end includes two vertical parts, a semi-circular part connected to one end of each vertical part, and an inclined part connected to the semi-circular part; the steel bars of the steel mesh are placed inside the semi-circular part. The present invention can effectively reduce the weight of precast components, and from the aspect of the combination of composite structures, introduce more operation space, bringing convenience to subsequent other process operations.

Description

Technical Field

[0001] The present invention relates to the technical field of precast concrete slabs, and particularly to a precast reinforced concrete composite slab based on a cold-formed steel skeleton and a preparation method thereof. Background Art

[0002] Due to the advantages of prefabricated buildings such as green, low-carbon, energy-saving and environmental protection, their application ratio is getting higher and higher. However, the traditional precast reinforced concrete slab has the disadvantage of large weight, resulting in difficult transportation and hoisting, and the absolute advantage over the traditional cast-in-place system cannot be always reflected in terms of efficiency.

[0003] Limited by weight and transportation conditions, traditional precast reinforced concrete slabs cannot enter or be hoisted in many occasions, especially under construction conditions with narrow sites. The common practice at this time is to further reduce the size of the slab, but this increases the number of joints, not only increasing the on-site workload, but also increasing potential problems such as water leakage and construction quality. Summary of the Invention

[0004] Aiming at the problems existing in the prior art, the present invention provides a precast reinforced concrete composite slab based on a cold-formed steel skeleton.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows:

[0006] A precast reinforced concrete composite slab based on a cold-formed steel skeleton, comprising: a cold-formed steel frame, a steel mesh, a concrete slab, and a plurality of metal clips;

[0007] One end of each of the metal clips is used to fix the steel mesh, and the other end is snapped into the cold-formed steel frame;

[0008] The steel mesh, the metal clips, and one side of the cold-formed steel frame connected to the metal clips are embedded in the concrete slab;

[0009] The metal clip includes a first end with elastic expansion ability and a second end with elastic expansion ability; the first end is used to fix the steel mesh, and the first end includes two vertical parts, a semi-circular part connected to one end of each vertical part, and an inclined part connected to the semi-circular part; the steel bars of the steel mesh are placed inside the semi-circular part; the second end includes a U-shaped part and clamping parts connected to both sides of the bottom end of the U-shaped part; the clamping parts are snapped into the cold-formed steel frame.

[0010] Preferably, the cold-formed steel frame includes two U-shaped keels and a plurality of C-shaped keels connected to the two U-shaped keels.

[0011] Preferably, each of the C-shaped keels is provided with a plurality of card holes adapted to the clamping parts.

[0012] Preferably, the steel mesh is in a mesh shape and is composed of a plurality of vertical steel bars and transverse steel bars.

[0013] Preferably, the vertical steel bars of the steel mesh are clamped into the semi-circular part.

[0014] The present invention provides a preparation method for a precast reinforced concrete composite slab based on a cold-formed steel skeleton, comprising the following steps:

[0015] Step 1: Horizontally place the prepared cold-formed steel frame and the steel mesh on a formwork table, and place the steel mesh under the cold-formed steel frame;

[0016] Step 2: Place the side with the clamping holes of the steel mesh close to one side of the steel mesh;

[0017] Step 3: Then connect the steel mesh and the cold-formed steel frame through metal clips;

[0018] Step 4: Finally, pour the concrete slab surface layer and then demold.

[0019] Preferably, the specific steps for connecting the steel mesh and the cold-formed steel frame through metal clips in Step 3 are as follows: First, clamp the clamping part of the metal clip into the clamping hole of the C-shaped keel, and then clamp the vertical steel bars of the steel mesh into the semi-circular part.

[0020] Preferably, when pouring the concrete slab in Step 4, the concrete slab surface close to the steel side of the cold-formed steel frame needs to be embedded into the cold-formed steel frame by a certain thickness.

[0021] Adopting the technical solution of the present invention has the following beneficial effects: The present invention can effectively reduce the weight of precast components, and from the combination of the composite structure, more operation space is introduced, bringing convenience to subsequent other process operations (such as installation of water and electricity pipelines, interior decoration, etc.). The flange form of the combination of the reinforced concrete slab, for example, drills holes in the cold-formed steel flange embedded in the concrete slab (to increase the adhesion with the reinforced concrete slab), and oval holes are opened on the web (to facilitate the installation of water and electricity pipelines). BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the present invention;

[0023] Figure 2 It is a schematic structural diagram of the metal clip of the present invention clamping the steel mesh;

[0024] Figure 3 It is an exploded view of the present invention;

[0025] Figure 4 It is a schematic structural diagram of the metal clip of the present invention;

[0026] Figure 5 It is a schematic structural diagram of the present invention applied to a load-bearing wall or an external decorative wall;

[0027] Figure 6 This is a schematic structural diagram of the application of the present invention to a floor slab. Specific embodiments

[0028] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0031] In the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In the present invention, unless otherwise clearly defined and limited, the first feature is "above" or

[0033] "Below" may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0034] Referring Figures 1 to 2 , the present invention provides a precast reinforced concrete composite slab based on a cold-formed steel skeleton, comprising: a cold-formed steel frame 1, a steel mesh 2, a concrete slab 4, and a plurality of metal clips 3;

[0035] One end of each of the metal clips 3 is used to fix the steel mesh 2, and the other end is snapped into the cold-formed steel frame 1;

[0036] One side of the steel mesh 2, the metal clip 3, and the cold-formed steel frame 1 connected to the metal clip 3 are embedded in the concrete slab 4;

[0037] The metal clip 3 includes a first end with elastic expansion ability and a second end with elastic expansion ability. Both the first end and the second end have elastic expansion ability and play a fixing role. All changes in shape belong to the protection scope of this patent; the first end is used to fix the steel mesh 2, and the first end includes two vertical parts 301, a semi-circular part 302 connected to one end of each vertical part 301, and an inclined part 303 connected to the semi-circular part 302; the steel bars of the steel mesh 2 are placed inside the semi-circular part 302; the second end includes a portal part 304 and clamping parts 305 connected to both sides of the bottom end of the portal part 304; the clamping parts 305 are snapped into the cold-formed steel frame 1.

[0038] The cold-formed steel frame 1 includes two U-shaped keels 101 and a plurality of C-shaped keels 102 connected to the two U-shaped keels 101. Each of the C-shaped keels 102 is provided with a plurality of card holes 103 (drilling treatment can be carried out) adapted to the clamping parts 305 on one side. The design of the card holes 103 facilitates the clamping parts 305 to be clamped on the card holes 103, and at the same time can increase the adhesiveness with the reinforced concrete. An oval opening 104 is formed on the other side of the C-shaped keel 102, which brings convenience for subsequent installation of water and electricity pipelines, interior decoration, etc. The steel mesh 2 is in a mesh shape and is composed of a plurality of vertical steel bars and horizontal steel bars. The vertical steel bars of the steel mesh 2 are snapped into the semi-circular part 302, and the horizontal steel bars are not snapped with the semi-circular part 302. Such a design can ensure convenient installation and prevent the occurrence of messy connection.

[0039] The present invention provides a preparation method for a precast reinforced concrete composite slab based on a cold-formed steel skeleton, comprising the following steps:

[0040] Step 1: Horizontally place the prepared cold-formed steel frame 1 and the steel mesh 2 on a formwork, and place the steel mesh 2 under the cold-formed steel frame 1.

[0041] Step 2: Move the side of the clamping hole 103 opened in the cold-formed steel frame 1 close to one side of the steel mesh 2.

[0042] Step 3: Then connect the steel mesh 2 and the cold-formed steel frame 1 with a metal clip 3.

[0043] Step 4: Finally, pour the surface layer of the concrete slab 4, and then demold.

[0044] The specific steps for connecting the steel mesh 2 and the cold-formed steel frame 1 with the metal clip 3 in Step 3: First, snap the clamping part 305 of the metal clip 3 into the clamping hole 103 of the C-shaped keel 102, and then snap the vertical steel bars of the steel mesh 2 into the semi-circular part 302.

[0045] When pouring the concrete slab 4 in Step 4, the surface of the concrete slab 4 on the side close to the cold-formed steel frame 1 needs to be embedded into the cold-formed steel frame by a certain thickness.

[0046] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A precast reinforced concrete composite slab based on a cold-formed steel skeleton, characterized in that, it includes: a cold-formed steel frame, a steel mesh, a concrete slab, and several metal clips; one end of each said metal clip is used to fix the steel mesh, and the other end is snapped into the cold-formed steel frame; the steel mesh, the metal clip, and one side of the cold-formed steel frame connected to the metal clip are embedded in the concrete slab; the metal clip includes a first end with elastic expansion ability and a second end with elastic expansion ability; the first end is used to fix the steel mesh, and the first end includes two vertical parts, a semi-circular part connected to one end of each vertical part, and an inclined part connected to the semi-circular part; the steel bars of the steel mesh are placed inside the semi-circular part; the second end includes a portal part and clamping parts connected to both sides of the bottom end of the portal part; the clamping parts are snapped into the cold-formed steel frame.

2. The precast reinforced concrete composite slab based on a cold-formed steel skeleton according to claim 1, characterized in that, the cold-formed steel frame includes two U-shaped keels and a plurality of C-shaped keels connected to the two U-shaped keels.

3. The precast reinforced concrete composite slab based on a cold-formed steel skeleton according to claim 2, characterized in that, each said C-shaped keel is provided with a plurality of card holes adapted to the clamping parts, and an oval opening is formed on the other surface of the C-shaped keel.

4. The precast reinforced concrete composite slab based on a cold-formed steel skeleton according to claim 1, characterized in that, the steel mesh is in a mesh shape and is composed of several vertical steel bars and transverse steel bars.

5. The precast reinforced concrete composite slab based on a cold-formed steel skeleton according to claim 4, characterized in that, the vertical steel bars of the steel mesh are snapped into the semi-circular part.

6. A preparation method of a precast reinforced concrete composite slab based on a cold-formed steel skeleton, characterized in that, it includes the following steps: Step 1: Horizontally place the prepared cold-formed steel frame and steel mesh on a formwork table, and place the steel mesh under the cold-formed steel frame; Step 2: Place the side of the cold-formed steel frame with the card holes close to the side of the steel mesh; Step 3: Then connect the steel mesh and the cold-formed steel frame through metal clips; Step 4: Finally, pour the concrete slab surface layer and then demold.

7. The preparation method according to claim 6, characterized in that, the specific steps of connecting the steel mesh and the cold-formed steel frame through metal clips in Step 3: First, snap the clamping parts of the metal clip into the card holes of the C-shaped keel, and then snap the vertical steel bars of the steel mesh into the semi-circular part.

8. The preparation method according to claim 6, characterized in that, when pouring the concrete slab in Step 4, the concrete slab surface near the steel side of the cold-formed steel frame needs to be embedded into the cold-formed steel frame by a certain thickness.

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