Prestressed high-strength fiber concrete prefabricated laminated slab

Abstract

The invention provides a pre-stressed high-strength fiber concrete prefabricated laminated slab, and relates to the technical field of prefabricated laminated slabs, the pre-stressed high-strength fiber concrete prefabricated laminated slab comprises a steel bar net rack which is laid at the bottom in an overhead manner, and the steel bar net rack is arranged in a horizontal state; the steel bar truss is detachably arranged on the steel bar net rack, and the steel bar truss is located above the steel bar net rack; the connecting hooks are connected to the steel bar net rack in a clamped mode, and the connecting hooks are distributed on the side wall of the steel bar net rack in a rectangular mode; the concrete layer is poured outside the steel bar net rack in a wrapping mode, and the ends of the steel bar trusses and the ends of the connecting hooks are exposed outside the concrete layer. The detachable design is adopted between the steel bar net frame and the steel bar truss, construction and connection of the steel bar net pieces can be rapidly completed, then the pouring efficiency of the prefabricated laminated slab is greatly improved, and the prefabricated laminated slab has the advantages of being simple in structure and convenient and fast to operate.

Description

Technical Field

[0001] The present invention relates to the technical field of precast composite slabs, and particularly relates to a prestressed high-strength fiber concrete precast composite slab. Background Art

[0002] A composite floor slab is an assembled monolithic floor slab formed by laminating a precast slab and a cast-in-place reinforced concrete layer. The composite floor slab has good integrity, and the upper and lower surfaces of the slab are flat, which is convenient for the decoration of the finishing layer. It is suitable for high-rise buildings and large-span buildings with relatively high requirements for overall stiffness. The precast slab is not only one of the components of the floor slab structure but also a permanent formwork for the cast-in-place reinforced concrete composite layer. Horizontal equipment pipelines can be laid in the cast-in-place composite layer. The composite floor slab has good integrity and high stiffness, can save formwork, and the upper and lower surfaces of the slab are flat, which is convenient for the decoration of the finishing layer. It is suitable for high-rise buildings and large-span buildings with relatively high requirements for overall stiffness. The prestressed thin slab has three functions: serving as a bottom formwork, providing reinforcement for the floor slab, and providing a flat bottom surface. Therefore, it has the advantages of saving steel formwork, reducing on-site steel bar operations, and not requiring plastering on the ceiling. In addition, since the steel wire protective layer of the thin slab is relatively thick, it can better meet the fire protection requirements.

[0003] For example, the authorized announcement number is CN107152122B, and the patent name is a precast composite slab, a precast composite slab joint structure, and a joint injection of concrete mortar. This patent includes a slab body. The side surface of the slab body is provided with an inclined surface that slopes downward from top to bottom in the direction of the interior of the slab body, and the lower edge of the inclined surface is higher than the bottom surface of the slab body; a notch located on the bottom surface of the slab body is provided below each inclined surface, and the lower edge of the inclined surface is located in the plane where the top surface of the notch is located; the included angle between the inclined surface and the vertical direction is ≤ 10°; the width of the notch is 50 - 60 mm; it also includes two adjacent slab bodies. The inclined surfaces of the two slab bodies are opposite to each other, and the opposite inclined surfaces are spliced into a triangular cavity. Below the triangular cavity is a square cavity, and the square cavity is formed by splicing two opposite notches on the two slab bodies; concrete mortar is injected into the triangular cavity and the square cavity; a mesh extension layer is arranged in the square cavity, and the mesh extension layer is parallel to the surface of the slab body; the concrete mortar includes the following components in parts by weight: 200 parts of ordinary Portland cement, 5 - 10 parts of redispersible latex powder, 200 - 400 parts of silica sand, 200 - 300 parts of ultra-fine fly ash, 8 - 12 parts of polyacrylamide, 20 - 30 parts of 2-acrylamide-2-methylpropanesulfonic acid, 8 - 10 parts of copolymerized polyacrylic acid, 5 - 8 parts of acrylamide, 10 - 15 parts of hydroxypropyl methylcellulose; the particle size of the ultra-fine fly ash is 110 - 130 mesh. This invention improves the strength and stability at the joint of two adjacent precast composite slabs and achieves the purpose of preventing cracks. Its implementation method is simple, and this structure can be precast only through a mold, and it has no negative impact on costs, efficiency, etc.

[0004] However, during the construction of this solution, the steel bar grid is processed by the conventional method of wire binding, which consumes a large amount of labor, has low construction efficiency, and has certain defects.

[0005] In view of this, the present application is specifically proposed. Summary of the Invention

[0006] The purpose of the present invention is to provide a prestressed high-strength fiber concrete precast composite slab to solve the problems raised in the above-mentioned background technology.

[0007] To solve the above technical problems, the technical solution of the present invention is as follows:

[0008] An embodiment of the present invention provides a prestressed high-strength fiber concrete precast composite slab, including:

[0009] A steel bar grid, the steel bar grid is laid overhead at the bottom, and the steel bar grid is arranged in a horizontal state;

[0010] A steel bar truss, the steel bar truss is detachably arranged on the steel bar grid, and the steel bar truss is located above the steel bar grid;

[0011] Connection hooks, the connection hooks are clamped on the steel bar grid, and the connection hooks are distributed in a rectangular shape on the side perimeter of the steel bar grid;

[0012] A concrete layer, the concrete layer is cast and coated outside the steel bar grid, and the ends of the steel bar truss and the ends of the connection hooks are exposed outside the concrete layer.

[0013] Further, the steel bar grid includes:

[0014] Connecting steel bars, several connecting steel bars are provided, and the connecting steel bars are vertically and horizontally distributed, and steel bar mesh holes are formed between the connecting steel bars;

[0015] Steel wire strips, the steel wire strips are arranged at the intersection joints of two connecting steel bars, and the steel wire strips tie the two intersecting connecting steel bars.

[0016] Further, the length and width dimensions of the steel bar mesh holes are not greater than 200 mm.

[0017] Further, the steel bar truss includes:

[0018] Elastic connecting frames, multiple groups of elastic connecting frames are provided, and each group of elastic connecting frames has two, and the two elastic connecting frames are connected by a shrinkable connecting strip;

[0019] Detachable hook, the detachable hook is fixedly arranged at the end of the elastic connecting frame, and the detachable hook is detachably connected with the connecting steel bar;

[0020] Penetrating steel bar, the penetrating steel bar passes through and is connected to the elastic connecting frame, and is connected to the elastic connecting frame by shrinking and closing through the shrinkage connecting strip.

[0021] Further, the detachable hook is arranged in a U shape, and the detachable hook is fixedly connected to the end of the elastic connecting frame away from the shrinkage connecting strip. The detachable hook is sleeved outside the connecting steel bar, and the detachable hook abuts against the connecting steel bar by the elastic force of the elastic connecting frame.

[0022] Further, the detachable hook fits against the outer side wall of the connecting steel bar, and positioning protrusions matching the connecting steel bar are arranged on the inner wall of the detachable hook.

[0023] Further, it further includes a lifting hook. The lifting hook penetrates through the steel bar grid, and the lifting hook is clamped with the steel bar grid. The end of the lifting hook is exposed outside the concrete layer.

[0024] Further, the upper surface of the concrete layer is provided with roughening grooves, and the depth of the roughening grooves is not less than 4 mm.

[0025] Further, the thickness of the concrete layer is not less than 60 mm, and the roughened area on the upper surface of the concrete layer is not less than 80% of the bonding area.

[0026] Further, the connecting hook is arranged in a "J" shape, and the hooked end of the connecting hook is exposed outside the concrete layer.

[0027] The above scheme of the present invention has at least the following beneficial effects:

[0028] Before the concrete of the present invention is poured, through the cooperation between the steel bar grid and the steel bar truss, the detachable connection between the steel bar truss and the steel bar grid can be realized, and the steel bar truss can be quickly installed on the steel bar grid according to the construction drawings, which can simplify the installation process of the steel bar truss, and thus greatly improve the installation efficiency of the steel bar truss, thereby improving the construction efficiency of the precast composite slab.

[0029] Further, the elastic force of the bending of the elastic connecting frame is used between the steel bar truss and the steel bar grid to drive the quick detachable connection between the detachable hook and the connecting steel bar, which not only improves the installation efficiency of the steel bar truss, but also can ensure the reliable connection between the detachable hook and the connecting steel bar, and ensures the construction quality of the precast composite slab. Description of the Drawings

[0030] Figure 1Schematic diagram of the overall structure of a prestressed high-strength fiber concrete precast composite slab provided by the present invention;

[0031] Figure 2 Schematic diagram of the sectional structure of a prestressed high-strength fiber concrete precast composite slab provided by the present invention;

[0032] Figure 3 Schematic diagram of the unfolded state structure of the elastic connection frame of a prestressed high-strength fiber concrete precast composite slab provided by the present invention;

[0033] Figure 4 Schematic diagram of the closed structure of the elastic connection frame of a prestressed high-strength fiber concrete precast composite slab provided by the present invention;

[0034] Figure 5 Schematic diagram of the cooperative structure of the elastic connection frame and the connecting steel bars of a prestressed high-strength fiber concrete precast composite slab provided by the present invention;

[0035] Figure 6 Schematic diagram of the lifting hook structure of a prestressed high-strength fiber concrete precast composite slab provided by the invention.

[0036] Explanation of reference numerals:

[0037] 1, steel bar grid; 2, steel bar truss; 3, connecting hook; 4, concrete layer; 5, lifting hook; 6, connecting steel bar; 7, steel wire strip; 8, elastic connection frame; 9, detachable snap hook; 10, through steel bar; 11, roughened groove; 12, shrinkage connection strip; 13, positioning base; 14, lifting ring; 15, clamping hook. Detailed implementation manners

[0038] Hereinafter, exemplary embodiments of the present invention will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present invention can be more thoroughly understood and the scope of the present invention can be completely conveyed to those skilled in the art.

[0039] As Figures 1 to 6 shown, an embodiment of the present invention provides a prestressed high-strength fiber concrete precast composite slab, including:

[0040] A steel bar grid 1, the steel bar grid 1 is laid overhead at the bottom, and the steel bar grid 1 is arranged in a horizontal state.

[0041] A steel bar truss 2, the steel bar truss 2 is detachably arranged on the steel bar grid 1, and the steel bar truss 2 is located above the steel bar grid 1.

[0042] A connecting hook 3, the connecting hook 3 is clamped on the steel bar grid 1, and the connecting hooks 3 are distributed in a rectangular shape on the side perimeter of the steel bar grid 1, and the connecting hook 3 is set in a "J" shape.

[0043] A concrete layer 4, the concrete layer 4 is cast and covered outside the steel bar grid 1, and the ends of the steel bar truss 2 and the ends of the connecting hook 3 are exposed outside the concrete layer 4.

[0044] In this embodiment, when the precast composite slab needs to be cast, first, the steel bar grid 1 is woven according to the specification size of the precast composite slab, and the steel bar grid 1 is laid overhead on the ground to be cast. Then, the steel bar truss 2 is installed on the steel bar grid 1, and at the same time, the connecting hook 3 is connected to the side perimeter of the steel bar grid 1. Finally, formwork is carried out around the steel bar grid 1. After the formwork is completed, the concrete layer 4 can be poured into the mold to complete the casting work of the precast composite slab.

[0045] In a specific embodiment, the precast composite slab further includes a lifting hook 5, the lifting hook 5 is disposed through the steel bar grid 1, and the lifting hook 5 is clamped with the steel bar grid 1, and the end of the lifting hook 5 is exposed outside the concrete layer 4. The lifting hook 5 of the precast composite slab is an important component for lifting and installing the precast composite slab. The position of the lifting hook 5 is usually designed according to the size, weight distribution of the precast composite slab and the requirements of the lifting process. Generally, it will be set at both ends or around the slab to ensure that the slab can be evenly stressed and maintain a horizontal state during lifting. The lifting hook 5 needs to be made of high-strength steel and can withstand various loads generated during the lifting, transportation and installation of the precast composite slab, including the self-weight of the slab, dynamic loads and possible wind loads, etc. Its bearing capacity should be strictly calculated and checked to ensure sufficient safety reserves.

[0046] Among them, the lifting hook 5 includes a positioning base 13, a lifting ring 14 and a clamping hook 15. The positioning base 13 is disposed below the steel bar grid 1, and the upper surface of the positioning base 13 is in contact with the steel bar grid 1. The lifting ring 14 is fixedly installed on the positioning base 13 by welding for lifting the precast composite slab. The clamping hook is fixedly disposed on the upper surface of the positioning base 13. The clamping hook is in a U shape, and the steel bar grid 1 is clamped in the U-shaped groove, realizing the detachable installation of the lifting hook 5. After the concrete is poured, a firm connection is formed between the lifting hook 5 and the steel bar grid 1, ensuring the stable and safe lifting of the precast composite slab.

[0047] During the construction process of the lifting hook 5, the positioning base 13 can be placed below the steel bar grid 1. When the steel bar grid 1 is being woven and tied, the steel bar grid 1 can be clamped in the U-shaped groove of the clamping hook. After the steel bar grid 1 is tied, the installation and fixation of the lifting hook 5 can be realized, greatly simplifying the installation process of the lifting hook 5 and at the same time ensuring the overall strength of the precast composite slab.

[0048] In addition, high-strength fiber concrete is adopted for the concrete. High-strength fiber concrete is a new type of composite material, which is formed by adding high-strength fibers to ordinary concrete as the matrix, and has higher strength and good performance. Commonly used high-strength fibers include steel fibers, carbon fibers, glass fibers, polypropylene fibers, etc. These fibers have the characteristics of high strength, high modulus, corrosion resistance, etc., and can significantly improve the tensile, flexural, impact resistance and other properties of the concrete.

[0049] Furthermore, the steel bar grid 1 includes:

[0050] Connecting steel bars 6, several connecting steel bars 6 are provided, and the connecting steel bars 6 are vertically and horizontally distributed, and a steel bar mesh hole is formed between the connecting steel bars 6.

[0051] Steel wire strips 7, the steel wire strips 7 are arranged at the intersection joints of two connecting steel bars 6, and the steel wire strips 7 tie the two intersecting connecting steel bars 6.

[0052] In this embodiment, when weaving the steel bar grid 1, multiple connecting steel bars 6 are horizontally placed in parallel at equal intervals, and then multiple connecting steel bars 6 are vertically placed in parallel at equal intervals. The horizontally placed connecting steel bars 6 and the vertically placed connecting steel bars 6 are perpendicular to each other, and the steel wire strips 7 are used for binding and fixing at the joints of the horizontally placed connecting steel bars 6 and the vertically placed connecting steel bars 6. After all the joints of the connecting steel bars 6 are bound and fixed by the steel wire strips 7, the weaving operation of the steel wire grid can be completed.

[0053] During the binding and fixing process of the steel bar grid 1, a steel bar mesh hole is formed between two horizontally distributed connecting steel bars 6 and two vertically distributed connecting steel bars 6, and the length and width dimensions of the steel bar mesh hole are not greater than 200 mm. In "Steel Welded Mesh for Reinforced Concrete" GB / T 1499.3-2010, there are various types of standardized steel bar meshes, and their mesh sizes are between 100 mm and 200 mm. For example, type A is 200 mm×200 mm, type B is 100 mm×200 mm, type C is 150 mm×200 mm, type D is 100 mm×100 mm, type E is 150 mm×150 mm, type F is 100 mm×150 mm, etc.

[0054] Design and calculation are carried out according to the mechanical characteristics, span, bearing capacity, etc. of the precast composite slab. For example, for composite slabs with a larger span and higher bearing requirements, denser steel bar arrangements and smaller mesh sizes may be required to ensure the flexural and shear resistance performance of the slab. For example, in some large commercial buildings or industrial factories, due to the large floor load, the steel bar mesh holes of the composite slab may adopt smaller sizes, such as 100 mm×100 mm or 150 mm×150 mm.

[0055] Furthermore, the steel bar truss 2 includes:

[0056] Elastic connecting frames 8, multiple groups of the elastic connecting frames 8 are provided, and two elastic connecting frames 8 are provided in each group, and the two elastic connecting frames 8 are connected by a shrinkage connecting strip 12.

[0057] Detachable hooks 9, the detachable hooks 9 are fixedly arranged at the ends of the elastic connecting frames 8, and the detachable hooks 9 are detachably connected to the connecting steel bars 6.

[0058] Penetrating steel bars 10, the penetrating steel bars 10 cross and connect with the elastic connecting frames 8, and are connected to the elastic connecting frames 8 by shrinking and closing the shrinkage connecting strip 12.

[0059] In this embodiment, the elastic connecting frame 8 is arranged in a zigzag shape and has bending elasticity. When installing the elastic connecting frame 8, the two elastic connecting frames 8 are bent, and at this time the shrinkage connecting strip 12 is bent into an arc shape. At the same time, press the two sides of the elastic connecting frame 8 to make the bending angle of the elastic connecting frame 8 decrease. Then, put the two detachable hooks 9 between two adjacent connecting steel bars 6 and align the connecting steel bars 6 with the openings of the detachable hooks 9. At this time, release the elastic connecting frame 8, and the detachable hooks 9 are clamped to the outside of the connecting steel bars 6 under the elastic force of the elastic connecting frame 8, completing the installation of the elastic connecting frame 8. Finally, insert the penetrating steel bar 10 into the arc-shaped bending part of the shrinkage connecting strip 12, and at this time close the shrinkage connecting strip 12 to complete the erection process of the steel bar truss 2. In this process, there is no need to use steel wires to bind and fix the steel bars, and the operation is simple, greatly improving the construction efficiency.

[0060] In a specific embodiment, the detachable hook 9 is arranged in a U shape, and the detachable hook 9 is fixedly connected to the end of the elastic connecting frame 8 away from the shrinkage connecting strip 12. The detachable hook 9 is sleeved outside the connecting steel bar 6, and the detachable hook 9 abuts against the connecting steel bar 6 under the elastic force of the elastic connecting frame 8. When the detachable hook 9 is clamped with the connecting steel bar 6, the detachable hook 9 is located inside the steel bar mesh holes. Under the elastic force of the elastic connecting frame 8, the detachable hook 9 always keeps abutting against the connecting steel bar 6, realizing a firm connection between the detachable hook 9 and the connecting steel bar 6.

[0061] During the process of the detachable hook 9 and the connecting steel bar 6 being engaged, the detachable hook 9 is in contact with the outer wall of the connecting steel bar 6. In order to prevent the detachable hook 9 and the connecting steel bar 6 from being separated due to horizontal rotation, a positioning protrusion matching the connecting steel bar 6 is provided on the inner wall of the detachable hook 9. When the detachable hook 9 is inserted into the connecting steel bar 6, the positioning protrusion is engaged with the groove on the surface of the connecting steel bar 6, which can effectively prevent the detachable hook 9 from tilting in the horizontal direction, thereby ensuring a secure engagement between the detachable hook 9 and the connecting steel bar 6.

[0062] Furthermore, a textured groove 11 is provided on the upper surface of the concrete layer 4, and the depth of the textured groove 11 is not less than 4 mm.

[0063] In this embodiment, the prefabricated composite board needs to form an integral structure with the post-cast concrete during construction. The roughening groove 11 increases the roughness of the surface of the prefabricated board, increases the contact area between the post-cast concrete and the prefabricated board, thereby improving the mechanical bite force and bonding strength between the two, ensuring that the superimposed surface can effectively transmit shear force and tension, so that the prefabricated composite board and the post-cast concrete work together to form an integral structural member, improving the integrity and stability of the structure.

[0064] In addition, the roughened groove 11 makes the connection between the prefabricated composite board and the post-cast concrete tighter, and can better coordinate the deformation. When the structure is under load, the composite surface is not prone to relative sliding or separation, thereby reducing the possibility of cracks caused by uncoordinated deformation and improving the crack resistance and durability of the structure.

[0065] At the same time, good bonding can make the overlapping surfaces form a relatively tight whole, reduce the channels for water penetration, improve the waterproof performance of the composite board, prevent moisture from penetrating into the structure from the overlapping surfaces, cause erosion and damage to the structure, and extend the service life of the structure.

[0066] In a specific embodiment, the thickness of the concrete layer 4 is not less than 60 mm, and the roughened area of ​​the upper surface of the concrete layer 4 is not less than 80% of the combined area. As an important part of the floor structure, the prefabricated composite slab needs to bear various loads on the floor, such as deadweight, personnel activity load, equipment load, etc. Sufficient thickness can ensure that it has a certain bending and shearing resistance to meet the bearing capacity requirements and avoid excessive deformation or even damage during use. Appropriate thickness helps to improve the rigidity of the composite slab and reduce the deflection under load. Smaller deflection can ensure the flatness of the floor and avoid affecting the use function of the building due to excessive deformation of the floor, such as causing ground cracks, unstable equipment installation and other problems.

[0067] In addition, the roughened area on the upper surface of the concrete layer 4 is not less than 80% of the bonding area. A sufficient roughened area can provide greater bonding force. The surface after roughening treatment is uneven. When contacting the post-cast concrete, more mechanical interlocking points are formed, making the bond between the two more firm. If the roughened area is insufficient, the bonding force will be limited. When the structure is stressed, relative sliding or separation is likely to occur at the composite surface, affecting the integrity of the structure.

[0068] In addition, when the structure bears the load, it is necessary to effectively transfer the stress between the precast composite slab and the post-cast concrete through the composite surface. A larger roughened area helps to evenly distribute the stress and avoid stress concentration. When the roughened area reaches 80% or more of the bonding area, it can ensure that the composite surface can work well together under various stress states, enabling the entire structure to jointly bear the load and improving the load-bearing capacity and anti-deformation ability of the structure.

[0069] At the same time, good bonding can not only improve the structural performance but also enhance the waterproof performance of the composite surface. When the roughened area is large enough, the post-cast concrete can better fill the unevenness on the surface of the precast slab, forming a tight bond, reducing gaps and holes, thereby effectively preventing water penetration and preventing problems such as reduced structural durability caused by leakage.

[0070] Working principle:

[0071] First, the steel bar grid 1 is woven according to the specifications and dimensions of the precast composite slab, and the steel bar grid 1 is laid overhead on the ground to be poured. Then, the steel bar truss 2 is installed on the steel bar grid 1, and at the same time, the connecting hook 3 is connected to the side perimeter of the steel bar grid 1. Subsequently, formwork is carried out around the steel bar grid 1. After the formwork is completed, the concrete layer 4 can be poured into the mold to complete the pouring work of the precast composite slab. Finally, roughening grooves 11 are opened on the surface of the concrete layer 4, and the surface of the concrete layer 4 is roughened to improve the good bonding force between the precast composite slab and the subsequently poured concrete, ensuring the stability of the subsequent construction of the precast composite slab.

[0072] Different from the prior art, this solution has at least the following beneficial effects:

[0073] Before the concrete pouring of the present invention, through the cooperation between the steel bar grid and the steel bar truss, the detachable connection between the steel bar truss and the steel bar grid can be realized, and the steel bar truss can be quickly installed on the steel bar grid according to the construction drawings, which can simplify the installation process of the steel bar truss, and then greatly improve the installation efficiency of the steel bar truss, thereby improving the construction efficiency of the precast composite slab.

[0074] Furthermore, the elastic bending force of the elastic connecting frame is utilized between the steel bar truss and the steel bar grid to drive the quick detachable connection between the detachable hook and the connecting steel bar, which not only improves the installation efficiency of the steel bar truss, but also ensures the reliable connection between the detachable hook and the connecting steel bar, thus guaranteeing the construction quality of the precast composite slab.

[0075] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A prestressed high-strength fiber concrete precast composite slab, characterized in that: Comprising: A steel bar grid (1), the steel bar grid (1) is laid overhead at the bottom, and the steel bar grid (1) is arranged in a horizontal state; Steel bar trusses (2), the steel bar trusses (2) are detachably arranged on the steel bar grid (1), and the steel bar trusses (2) are located above the steel bar grid (1); Connection hooks (3), the connection hooks (3) are clamped on the steel bar grid (1), and the connection hooks (3) are distributed in a rectangular shape on the side perimeter of the steel bar grid (1); A concrete layer (4), the concrete layer (4) is cast and coated outside the steel bar grid (1), and the ends of the steel bar trusses (2) and the ends of the connection hooks (3) are exposed outside the concrete layer (4).

2. A prestressed high-strength fiber concrete precast composite slab according to claim 1, characterized in that: The steel bar grid (1) includes: Connecting steel bars (6), several connecting steel bars (6) are provided, and the connecting steel bars (6) are vertically and horizontally distributed, and steel bar mesh holes are formed between the connecting steel bars (6); Steel wire strips (7), the steel wire strips (7) are arranged at the intersection joints of two connecting steel bars (6), and the steel wire strips (7) tie up the two intersecting connecting steel bars (6).

3. A prestressed high-strength fiber concrete precast composite slab according to claim 2, characterized in that: The length and width dimensions of the steel bar mesh holes are not greater than 200 mm.

4. A prestressed high-strength fiber concrete precast composite slab according to claim 2, characterized in that: The steel bar truss (2) includes: Elastic connection frames (8), multiple groups of elastic connection frames (8) are provided, and each group of elastic connection frames (8) has two, and the two elastic connection frames (8) are connected by a shrinkage connection strip (12); Detachable hooks (9), the detachable hooks (9) are fixedly arranged at the ends of the elastic connection frames (8), and the detachable hooks (9) are detachably connected to the connecting steel bars (6); Penetrating steel bars (10), the penetrating steel bars (10) pass through and connect the elastic connection frames (8), and are connected to the elastic connection frames (8) by shrinking and closing through the shrinkage connection strip (12).

5. A prestressed high-strength fiber concrete precast composite slab according to claim 4, characterized in that: The detachable hook (9) is arranged in a U shape, and the detachable hook (9) is fixedly connected to the end of the elastic connection frame (8) away from the shrinkage connection strip (12), the detachable hook (9) is sleeved outside the connecting steel bar (6), and the detachable hook (9) abuts against the connecting steel bar (6) through the elastic force of the elastic connection frame (8).

6. A prestressed high-strength fiber concrete precast composite slab according to claim 5, characterized in that: The detachable hook (9) fits against the outer side wall of the connecting steel bar (6), and positioning protrusions matching the connecting steel bar (6) are arranged on the inner wall of the detachable hook (9).

7. A prestressed high-strength fiber concrete precast composite slab according to claim 1, characterized in that: It further includes a lifting hook (5), the lifting hook (5) penetrates through the steel bar grid (1), and the lifting hook (5) is clamped with the steel bar grid (1), and the end of the lifting hook (5) is exposed outside the concrete layer (4).

8. A prestressed high-strength fiber concrete precast composite slab according to claim 1, characterized in that: The upper surface of the concrete layer (4) is provided with roughening grooves (11), and the depth of the roughening grooves (11) is not less than 4 mm.

9. A prestressed high-strength fiber concrete precast composite slab according to claim 1, characterized in that: The thickness of the concrete layer (4) is not less than 60 mm, and the roughened area on the upper surface of the concrete layer (4) is not less than 80% of the bonding area.

10. A stress-high-strength fiber concrete precast composite slab according to claim 1, characterized in that: The connecting hook (3) is arranged in a "J" shape, and the hooked end of the connecting hook (3) is exposed outside the concrete layer (4).

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