Prefabricated composite slab for fabricated building
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- QINGDAO EVERBRIGHT GRP LARGE COMPONENTS CO LTD
- Filing Date
- 2025-08-14
- Publication Date
- 2026-07-14
Smart Images
Figure CN224495538U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of prefabricated building technology, and in particular to a prefabricated composite slab for prefabricated buildings. Background Technology
[0002] Prefabricated construction refers to the transfer of a large amount of on-site work from traditional construction methods to factories. Building components and accessories are prefabricated in factories, transported to the construction site, and assembled on-site using reliable connection methods. In prefabricated construction, composite slabs are the most widely used prefabricated components, and their construction quality has a significant impact on the entire project. Composite slabs are assembled monolithic floor slabs composed of prefabricated composite slabs and cast-in-place reinforced concrete layers.
[0003] An existing patent (publication number: CN218843488U) discloses a precast composite slab for prefabricated buildings, including a concrete structural layer, a steel mesh, V-shaped support strips, and continuous steel bars. The steel mesh is embedded in the concrete structural layer. This invention provides end protrusions and end grooves at both ends of the concrete structural layer, and side protrusions and side grooves on both sides of the concrete structural layer. This allows for a larger contact area when two adjacent precast composite slabs are connected, resulting in stronger adhesion between them. During use, cracks are less likely to occur between adjacent precast composite slabs, affecting their usability. This invention also increases the contact area on the upper surface of the concrete structural layer by providing protrusions and grooves, thereby increasing the bonding strength between the precast composite slab and the cast-in-place concrete layer, and thus improving the structural strength and stability of the prefabricated building.
[0004] While the aforementioned comparative device increases the contact area through the cooperation of the protrusions and grooves, thus improving the adhesion with cast-in-place concrete to some extent, it still has significant limitations: First, the side surfaces of the end protrusions and side protrusions, as well as the inner surfaces of the end grooves and side grooves, are smooth. The protrusions and grooves on the upper surface of the concrete structure layer are simple and smooth structures, lacking effective mechanical interlocking structures. This results in limited connection tightness, pull-out resistance, and mechanical interlocking effect with the cast-in-place concrete, and the bonding strength needs to be improved. Second, the end bends of the steel mesh have a single direction, resulting in insufficient multi-directional anchoring with the cast-in-place concrete. Furthermore, key connection parts such as the end protrusions and end grooves do not use dedicated reinforcing materials, making them prone to structural performance degradation due to wear, aging, and insufficient anchoring force during long-term use. Therefore, it is urgent to improve the existing technology to enhance the connection strength and overall structural stability of the precast composite slab with cast-in-place concrete. To this end, a precast composite slab for prefabricated buildings is provided. Utility Model Content
[0005] The purpose of this application is to provide a precast composite slab for prefabricated buildings, which has the characteristics of enhancing the connection strength between the precast composite slab and the cast-in-place concrete and the overall structural stability.
[0006] This application provides a precast composite slab for prefabricated buildings, employing the following technical solution: It includes a concrete structural layer and a reinforcing mesh, the reinforcing mesh being embedded within the concrete structural layer; the concrete structural layer has end protrusions and end recesses at its front and rear ends, and side protrusions and side recesses on its left and right sides; the reinforcing mesh includes a first longitudinal reinforcing bar and a second longitudinal reinforcing bar, with the portion extending beyond the concrete structural layer having end bends; the upper surface of the concrete structural layer has protrusions and recesses; the sides of the end protrusions at the front and rear ends of the concrete structural layer have first barbed structures, and the inner side of the end recesses has a first corrugated texture; the sides of the side protrusions on the left and right sides of the concrete structural layer have second barbs... The structure features a barbed structure with a second corrugated texture on the inner side of the side groove. The end bends of the first and second longitudinal steel bars of the steel mesh are distributed at multiple angles. The top of the protrusion on the upper surface of the concrete structure layer has a third barbed structure, and the inner side of the groove body has a third corrugated texture. The protrusion and the groove body are arranged in an alternating array. The main body of the end protrusion, end groove, side protrusion, and side groove is made of fiber-reinforced composite material. The surface of the end bend is coated with a wear-resistant alloy. The surface of the protrusion and groove body is mixed with nano-scale reinforcing filler. The concrete structure layer has several weight-reducing holes, which are through holes that penetrate along the thickness direction of the concrete structure layer.
[0007] By adopting the above technical solution, a first barb structure is provided on the side of the end protrusion, a first corrugated texture is provided on the inside of the end groove, a second barb structure is provided on the side of the side protrusion, a second corrugated texture is provided on the inside of the side groove, a third barb structure is provided on the top of the protrusion, and a third corrugated texture is provided on the inside of the groove body. This provides an effective mechanical interlocking structure for each connection part, significantly improving the connection tightness, pull-out resistance, and mechanical interlocking effect with the cast-in-place concrete. The multi-angle distributed end elbows enhance the multi-directional anchoring effect with the cast-in-place concrete. The wear-resistant alloy coating on the surface of the end protrusion and other key parts made of fiber-reinforced composite materials, as well as the nano-level reinforcing filler on the surface of the protrusion and groove body, improve the wear resistance, aging resistance, and durability of the structure. The through-hole weight-reducing hole reduces weight while providing space for subsequent functional optimization, and the overall connection strength and structural stability of the precast composite slab and the cast-in-place concrete are enhanced.
[0008] Preferably, the steel mesh further includes a first transverse steel bar and a second transverse steel bar, which are arranged in a mesh with the first longitudinal steel bar and the second longitudinal steel bar and are fixed by binding. The first transverse steel bar and the second transverse steel bar are embedded in the concrete structural layer.
[0009] By adopting the above technical solution, the first and second transverse steel bars are arranged in a mesh with the first and second longitudinal steel bars and tied and fixed, so that the steel mesh forms a more stable overall load-bearing structure, which improves the load-bearing capacity and deformation resistance of the steel mesh, further enhances the overall structural stability of the precast composite slab, ensures that each steel bar is subjected to force in a coordinated manner, and reduces local stress concentration.
[0010] Preferably, the weight-reducing holes are evenly distributed along the length of the concrete structural layer, and the weight-reducing holes are filled with lightweight sound-insulating material.
[0011] By adopting the above technical solution, the weight reduction holes are evenly distributed along the length of the concrete structural layer and filled with lightweight sound insulation material. While reducing the weight of the slab in a balanced manner, the lightweight sound insulation material plays a good role in sound insulation, which improves the comfort of the building. Moreover, the evenly distributed structural design avoids the local strength reduction caused by weight reduction.
[0012] Preferably, the protrusion and the groove body have the same depth, and multiple sets of the protrusion and the groove body are provided, and they are evenly and alternately arranged on the upper end of the concrete structure layer.
[0013] By adopting the above technical solution, the protrusion and groove are of the same depth and are arranged in multiple sets evenly and alternately, so that the contact force between the upper surface of the concrete structure layer and the cast-in-place concrete layer is more uniform, avoiding the problem of insufficient local bonding strength, and further improving the bonding stability between the two and the consistency of the overall structure.
[0014] Preferably, the first barb structure, the second barb structure and the third barb structure are made of high-strength alloy steel and their surfaces are treated with anti-corrosion coating.
[0015] By adopting the above technical solutions, the first, second, and third barb structures, made of high-strength alloy steel and treated with anti-corrosion, improve the strength and corrosion resistance of the barb structure, ensuring that it can maintain a stable mechanical interlocking effect during long-term use and is not prone to failure due to wear or corrosion.
[0016] Preferably, the surface of the first, second, and third corrugated textures is coated with a penetrating sealant compatible with the material of the concrete structural layer.
[0017] By adopting the above technical solution, a penetrating sealant compatible with the concrete structural layer material is sprayed onto the surface of the first, second, and third corrugated textures, which enhances the adhesion between the texture structure and the concrete, while also providing anti-corrosion protection, extending the effective service life of the corrugated texture, and ensuring its long-term effect on improving the bonding strength.
[0018] Preferably, the first longitudinal steel bar, the second longitudinal steel bar, the first transverse steel bar, and the second transverse steel bar of the steel mesh are all made of micro-alloyed steel bars, and their surfaces are provided with a passivation film.
[0019] By adopting the above technical solution, the first longitudinal steel bar, the second longitudinal steel bar, the first transverse steel bar, and the second transverse steel bar, which are made of micro-alloyed steel bars and have a passivation film on their surface, improve the strength, toughness, and corrosion resistance of the steel bars, extend the service life of the steel mesh, and ensure that it can play a long-term stable role in bearing and anchoring.
[0020] Preferably, the wear-resistant alloy coating on the surface of the end elbow is a nickel-based alloy coating.
[0021] By adopting the above technical solution, the nickel-based alloy coating on the surface of the end elbow has excellent wear resistance and corrosion resistance, which can effectively resist the wear and corrosion of the end elbow in contact with concrete and during long-term use, ensuring the long-term effectiveness of its multi-angle anchoring function and improving the durability of the structure.
[0022] In summary, this application includes at least one of the following beneficial technical effects:
[0023] This precast composite slab for prefabricated buildings features a first barb structure, a first corrugated texture, a second barb structure, a third barb structure, and a third corrugated texture. When adjacent precast composite slabs are joined, the end protrusions align with the end grooves, and the side protrusions align with the side grooves. The first and second barb structures embed into the cast-in-place concrete. The first and second corrugated textures increase the contact area and friction with the concrete. When the protrusions on the upper surface of the concrete structural layer combine with the cast-in-place concrete layer, the third barb structure and the third corrugated texture further enhance the mechanical interlocking, effectively solving the problems of limited connection tightness, pull-out resistance, and mechanical interlocking effect caused by the lack of mechanical interlocking structures in existing technologies, significantly improving the bonding strength with the cast-in-place concrete. The end bends of the first and second longitudinal steel bars of the reinforcing mesh are distributed at multiple angles during pouring. During concrete pouring, the end elbows at different angles form multi-directional anchorage with the concrete, enhancing the anchorage effect. Simultaneously, the first and second transverse reinforcing bars, along with the first and second longitudinal reinforcing bars, are arranged in a mesh and tied together, forming an integral load-bearing structure. This improves the overall integrity and load-bearing capacity of the reinforcing mesh, solving the problem of insufficient multi-directional anchorage caused by the single direction of the end elbows and enhancing structural stability. The end protrusions, end grooves, side protrusions, and side grooves utilize fiber-reinforced composite materials, improving the strength and wear resistance of key connection points and reducing wear and aging during long-term use. The nickel-based alloy coating on the surface of the end elbows enhances their wear resistance and corrosion resistance. The nano-scale reinforcing filler added to the surface of the protrusions and grooves improves their structural strength and durability, effectively preventing structural performance degradation due to material issues and extending the service life of the precast composite slab. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of this application;
[0025] Figure 2 for Figure 1 Schematic diagram of the structure at point A;
[0026] Figure 3 for Figure 1 Schematic diagram of the structure at point B;
[0027] Figure 4 This is a partial three-dimensional structural diagram of the protrusion and groove body of this application;
[0028] Figure 5 This is a structural schematic diagram of the steel mesh in this application.
[0029] In the picture:
[0030] 1. Concrete structural layer; 2. Reinforcing mesh; 201. First longitudinal reinforcement; 202. Second longitudinal reinforcement; 203. First transverse reinforcement; 204. Second transverse reinforcement; 3. End protrusion; 4. End groove; 5. Side protrusion; 6. Side groove; 7. End bend; 8. Protrusion; 9. Groove body; 10. First barb structure; 11. First corrugated texture; 12. Second barb structure; 13. Second corrugated texture; 14. Third barb structure; 15. Third corrugated texture; 16. Weight reduction hole. Detailed Implementation
[0031] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.
[0032] Example 1: A prefabricated composite slab for prefabricated buildings, referring to... Figure 1 , Figure 2 and Figure 3The structure includes a concrete structural layer 1 and a steel mesh 2, with the steel mesh 2 embedded within the concrete structural layer 1. The concrete structural layer 1 has end protrusions 3 and end recesses 4 at its front and rear ends, and side protrusions 5 and side recesses 6 on its left and right sides. The steel mesh 2 includes a first longitudinal steel bar 201 and a second longitudinal steel bar 202, with the portion extending out of the concrete structural layer 1 having end bends 7. The upper surface of the concrete structural layer 1 has protrusions 8 and recesses 9. The sides of the end protrusions 3 at the front and rear ends of the concrete structural layer 1 have first barbed structures 10, and the inner side of the end recesses 4 has first corrugated textures 11. The side protrusions 5 on both sides of the structural layer 1 are provided with a second barb structure 12, and the inner side of the side groove 6 is provided with a second corrugated texture 13; the end bends 7 of the first longitudinal steel bar 201 and the second longitudinal steel bar 202 of the steel mesh 2 are distributed at multiple angles; the top of the protrusion 8 on the upper surface of the concrete structural layer 1 is provided with a third barb structure 14, and the inner side of the groove body 9 is provided with a third corrugated texture 15, and the protrusion 8 and the groove body 9 are arranged in an alternating array; the main body of the end protrusion 3, the end groove 4, the side protrusion 5 and the side groove 6 are made of fiber reinforced composite material, and the surface of the end bend 7 is composite with wear-resistant material. The surface of the protrusion 8 and the groove body 9 is coated with gold and incorporating nano-scale reinforcing filler. Several weight-reducing holes 16 are provided within the concrete structural layer 1, each being a through-hole extending along the thickness direction of the concrete structural layer 1. Effective mechanical bonding is provided at each connection point by: a first barb structure 10 on the side of the end protrusion 3; a first corrugated texture 11 on the inner side of the end groove 4; a second barb structure 12 on the side of the side protrusion 5; a second corrugated texture 13 on the inner side of the side groove 6; a third barb structure 14 on the top of the protrusion 8; and a third corrugated texture 15 on the inner side of the groove body 9. The interlocking structure significantly improves the tightness of the connection with cast-in-place concrete, pull-out resistance, and mechanical interlocking effect; the multi-angle distributed end elbows 7 enhance the multi-directional anchoring effect with cast-in-place concrete; the wear-resistant alloy coating on the surface of key parts such as the end protrusions 3 made of fiber-reinforced composite materials, the nano-level reinforcing fillers on the surface of the end elbows 7, and the protrusions 8 and the groove body 9 improve the wear resistance, aging resistance, and durability of the structure; the through-hole weight-reducing hole 16 reduces weight while providing space for subsequent functional optimization, thus enhancing the overall connection strength and structural stability between the precast composite slab and the cast-in-place concrete.
[0033] Reference Figure 1 and Figure 5The reinforcing mesh 2 also includes a first transverse reinforcing bar 203 and a second transverse reinforcing bar 204. The first transverse reinforcing bar 203 and the second transverse reinforcing bar 204 are arranged in a mesh with the first longitudinal reinforcing bar 201 and the second longitudinal reinforcing bar 202 and are fixed by binding. The first transverse reinforcing bar 203 and the second transverse reinforcing bar 204 are embedded in the concrete structural layer 1. The weight-reducing holes 16 are evenly distributed along the length of the concrete structural layer 1 and are filled with lightweight sound-insulating material. The first transverse reinforcing bar 203 and the second transverse reinforcing bar 204 are connected with the first longitudinal reinforcing bar 201 and the second longitudinal reinforcing bar 202. The steel mesh 2 is arranged in a mesh pattern and tied in place, making it a more stable overall load-bearing structure. This improves the load-bearing capacity and deformation resistance of the steel mesh 2, further enhancing the overall structural stability of the precast composite slab. It ensures that each steel bar is subjected to force in a coordinated manner, reducing local stress concentration. The weight-reducing holes 16 are evenly distributed along the length of the concrete structural layer 1 and filled with lightweight sound insulation material. While reducing the weight of the slab in a balanced manner, the lightweight sound insulation material plays a good sound insulation role, improving the comfort of the building. The evenly distributed structural design avoids the decrease in local strength caused by weight reduction.
[0034] Reference Figure 1 , Figure 2 and Figure 4 The protruding head 8 and the groove body 9 have the same depth. Multiple sets of protruding heads 8 and groove bodies 9 are evenly and alternately arranged on the upper end of the concrete structure layer 1. The first barb structure 10, the second barb structure 12, and the third barb structure 14 are made of high-strength alloy steel and have been treated with anti-corrosion coating. The fact that the protruding head 8 and the groove body 9 have the same depth and are evenly and alternately arranged in multiple sets makes the contact force between the upper surface of the concrete structure layer 1 and the cast-in-place concrete layer more uniform, avoiding the problem of insufficient local bonding strength, and further improving the bonding stability between the two and the consistency of the overall structure. The first barb structure 10, the second barb structure 12, and the third barb structure 14, which are made of high-strength alloy steel and have been treated with anti-corrosion coating, improve the strength and corrosion resistance of the barb structure, ensuring that it can maintain the mechanical interlocking effect stably during long-term use and is not prone to failure due to wear or corrosion.
[0035] Reference Figure 1 and Figure 5The surfaces of the first corrugated texture 11, the second corrugated texture 13, and the third corrugated texture 15 are sprayed with a penetrating sealant compatible with the material of the concrete structural layer 1. The first longitudinal steel bar 201, the second longitudinal steel bar 202, the first transverse steel bar 203, and the second transverse steel bar 204 of the reinforcing mesh 2 are all micro-alloyed steel bars with a passivation film on their surfaces. The wear-resistant alloy coating on the surface of the end elbow 7 is a nickel-based alloy coating. The penetrating sealant compatible with the material of the concrete structural layer 1 is sprayed on the surfaces of the first corrugated texture 11, the second corrugated texture 13, and the third corrugated texture 15, which enhances the adhesion between the texture structure and the concrete, and at the same time plays a role in corrosion protection. The effective service life of the corrugated texture is extended, ensuring its long-term effect on improving the bonding strength. The first longitudinal steel bar 201, the second longitudinal steel bar 202, the first transverse steel bar 203, and the second transverse steel bar 204, which are made of micro-alloyed steel bars and have a passivation film on their surface, improve the strength, toughness, and corrosion resistance of the steel bars, extend the service life of the steel mesh 2, and ensure that it plays a stable role in bearing and anchoring for a long time. The nickel-based alloy coating on the surface of the end elbow 7 has excellent wear resistance and corrosion resistance, which can effectively resist the wear and corrosion of the end elbow 7 in contact with concrete and during long-term use, ensuring the long-term effectiveness of its multi-angle anchoring effect and improving the durability of the structure.
[0036] In this embodiment, by setting the first barb structure 10, the first corrugated texture 11, the second barb structure 12, the second corrugated texture 13, the third barb structure 14, and the third corrugated texture 15, when adjacent precast composite slabs are spliced, the end protrusion 3 connects with the end groove 4, and the side protrusion 5 connects with the side groove 6. The first barb structure 10 and the second barb structure 12 will be embedded in the cast-in-place concrete. The first corrugated texture 11 and the second corrugated texture 13 increase the contact area and friction with the concrete. When the protrusion 8 on the upper surface of the concrete structural layer 1 combines with the cast-in-place concrete layer, the third barb structure 14 and the third corrugated texture 15 further enhance the mechanical interlocking, effectively solving the problem of limited connection tightness, pull-out resistance, and mechanical interlocking effect caused by the lack of mechanical interlocking structure in the prior art, and significantly improving the bonding strength with the cast-in-place concrete. The end bends 7 of the first longitudinal steel bar 201 and the second longitudinal steel bar 202 of the steel mesh 2 are multi-angled. During concrete pouring, the end elbows 7 at different angles can form multi-directional anchorage with the concrete, enhancing the anchorage effect. Simultaneously, the first transverse steel bars 203 and the second transverse steel bars 204 are arranged in a mesh with the first longitudinal steel bars 201 and the second longitudinal steel bars 202, and are tied together, forming an integral load-bearing structure for the steel mesh 2. This improves the integrity and load-bearing capacity of the steel mesh 2, solving the problem of insufficient multi-directional anchorage caused by the single direction of the end elbows 7, and enhancing structural stability. The end protrusions 3, end grooves 4, side protrusions 5, and side grooves 6 are made of fiber-reinforced composite materials, improving the strength and wear resistance of key connection parts and reducing wear and aging during long-term use. The nickel-based alloy coating on the surface of the end elbows 7 enhances their wear resistance and corrosion resistance. The nano-level reinforcing filler added to the surface of the protrusions 8 and groove bodies 9 improves their structural strength and durability, effectively avoiding structural performance degradation due to material problems and extending the service life of the precast composite slab.
[0037] The implementation principle of this application embodiment is as follows: When splicing precast composite slabs, the end protrusions 3 of adjacent slabs are aligned with the end grooves 4, and the side protrusions 5 are aligned with the side grooves 6, so that the first barb structure 10, the first corrugated texture 11, the second barb structure 12, and the second corrugated texture 13 are located within the splicing joint. After pouring concrete into the splicing joint, the first barb structure 10 and the second barb structure 12 are embedded in the concrete to form a mechanical interlock. The first corrugated texture 11 and the second corrugated texture 13 increase the contact area and enhance the friction, thereby improving the connection tightness of adjacent slabs. The first longitudinal steel bar 201 and the second longitudinal steel bar 202 of the steel mesh 2 extend out of the concrete structural layer 1 with end bends 7, and the end bends 7 are distributed at multiple angles. During concrete pouring, the multi-angled end bends 7 form multi-directional anchorages with the concrete; simultaneously, the first transverse reinforcement 203 and the second transverse reinforcement 204 are tied together with the longitudinal reinforcement in a mesh pattern to form an overall load-bearing skeleton, jointly bearing the load and enhancing structural stability; the protrusions 8 and groove bodies 9 on the upper surface of the concrete structural layer 1 are distributed in an alternating array. When combined with the cast-in-place concrete layer, the third barb structure 14 on the top of the protrusion 8 is embedded into the cast-in-place layer, and the third corrugated texture 15 on the inner side of the groove body 9 increases the contact area, thus improving the mechanical interlocking effect with the cast-in-place layer through a dual action. The end protrusions 3, end grooves 4, side protrusions 5, and side grooves 6 are made of fiber-reinforced composite materials to resist wear and deformation during the assembly process; the nickel-based alloy coating on the surface of the end elbow 7 reduces wear and corrosion during anchoring; the nano-level reinforcing filler on the surface of the protrusions 8 and groove bodies 9 improves their structural strength and extends the service life of each component; the weight-reducing holes 16 in the concrete structural layer 1 are through holes, which can reduce the self-weight of the plate, while the lightweight sound insulation material filled in the holes blocks sound transmission, improving the building's sound insulation effect while ensuring structural performance.
Claims
1. A precast composite slab for prefabricated buildings, comprising a concrete structural layer (1) and a steel mesh (2), wherein the steel mesh (2) is embedded in the concrete structural layer (1); the concrete structural layer (1) has end protrusions (3) and end grooves (4) at its front and rear ends, and side protrusions (5) and side grooves (6) on its left and right sides; the steel mesh (2) includes a first longitudinal steel bar (201) and a second longitudinal steel bar (202), and the portion extending out of the concrete structural layer (1) has end bends (7); the upper surface of the concrete structural layer (1) is provided with protrusions (8) and groove bodies (9), characterized in that: The concrete structural layer (1) has a first barb structure (10) on the side of the end protrusion (3) at the front and rear ends, and a first corrugated texture (11) on the inner side of the end groove (4); the concrete structural layer (1) has a second barb structure (12) on the side of the side protrusion (5) on the left and right sides, and a second corrugated texture (13) on the inner side of the side groove (6); the end bends (7) of the first longitudinal steel bar (201) and the second longitudinal steel bar (202) of the steel mesh (2) are distributed at multiple angles; the top of the protrusion (8) on the upper surface of the concrete structural layer (1) has a third barb structure. (14) The inner side of the groove body (9) is provided with a third wavy texture (15), and the protrusion (8) and the groove body (9) are arranged in an alternating array; the main body of the end protrusion (3), end groove (4), side protrusion (5) and side groove (6) is made of fiber reinforced composite material, the surface of the end elbow (7) is coated with wear-resistant alloy, and the surface of the protrusion (8) and the groove body (9) is mixed with nano-level reinforcing filler; the concrete structure layer (1) is provided with a number of weight reduction holes (16), and the weight reduction holes (16) are through holes that penetrate along the thickness direction of the concrete structure layer (1).
2. The prefabricated composite slab for prefabricated buildings according to claim 1, characterized in that: The steel mesh (2) also includes a first transverse steel bar (203) and a second transverse steel bar (204). The first transverse steel bar (203) and the second transverse steel bar (204) are arranged in a mesh with the first longitudinal steel bar (201) and the second longitudinal steel bar (202) and are fixed by binding. The first transverse steel bar (203) and the second transverse steel bar (204) are embedded in the concrete structure layer (1).
3. A prefabricated composite slab for prefabricated buildings according to claim 1, characterized in that: The weight-reducing holes (16) are evenly distributed along the length of the concrete structural layer (1), and the weight-reducing holes (16) are filled with lightweight sound-insulating material.
4. A prefabricated composite slab for prefabricated buildings according to claim 1, characterized in that: The protrusion (8) and the groove body (9) have the same depth. The protrusion (8) and the groove body (9) are provided in multiple sets and are evenly and alternately arranged on the upper end of the concrete structure layer (1).
5. A prefabricated composite slab for prefabricated buildings according to claim 1, characterized in that: The first barb structure (10), the second barb structure (12) and the third barb structure (14) are made of high-strength alloy steel and their surfaces are treated with anti-corrosion.
6. A prefabricated composite slab for prefabricated buildings according to claim 1, characterized in that: The surface of the first corrugated texture (11), the second corrugated texture (13) and the third corrugated texture (15) is sprayed with a penetrating sealant compatible with the material of the concrete structural layer (1).
7. A prefabricated composite slab for prefabricated buildings according to claim 2, characterized in that: The first longitudinal steel bar (201), the second longitudinal steel bar (202), the first transverse steel bar (203) and the second transverse steel bar (204) of the steel mesh (2) are all micro-alloyed steel bars with a passivation film on their surface.
8. A prefabricated composite slab for prefabricated buildings according to claim 1, characterized in that: The wear-resistant alloy coating on the surface of the end elbow (7) is a nickel-based alloy coating.