Prefabricated composite floor

Abstract

The utility model belongs to floor technology field especially, it is a kind of fabricated composite floor, including floor body, encapsulation cover and sealing plate, the pouring cavity is seted up in floor body inside, pouring cavity top opening covers encapsulation cover;Floor body one side is equipped with side jointed slot, the other side of floor body is fixed with the clamping block matched with side jointed slot, floor body front end is fixed with extension column, floor body rear end is seted up with the butt joint slot corresponding with extension column, the top of encapsulation cover is equipped with screw hole, positioning screw rod is installed in screw hole, sealing plate is buckled on the positioning screw rod top;It is connected to the diagonal by four corner fixed link, and the shear resistance is enhanced with the reinforcing mesh in pouring cavity, the plug-in design of extension column and butt joint slot disperses longitudinal load, the on-site mold sealing process is dispensed with by integrated cover, shortens construction period, sealing plate and glue seal layer double-block water oxygen contact, prolongs screw rod life.

Description

Technical Field

[0001] This utility model belongs to the field of floor slab technology, specifically relating to a prefabricated composite floor slab. Background Technology

[0002] Prefabricated composite floor slabs are prefabricated monolithic floor slabs made by stacking precast base slabs and cast-in-place concrete layers, combining the efficiency of precast components with the integrity of cast-in-place structures.

[0003] Composite floor slabs have good overall integrity and high rigidity, which can save on formwork. Moreover, the upper and lower surfaces of the slabs are flat, which facilitates the finishing layer decoration. They are suitable for high-rise buildings and large-span buildings with high requirements for overall rigidity.

[0004] Although existing prefabricated floor slabs can be partially prefabricated, the connection nodes often rely on welding or grouting. The lap joints of the reinforcing bars are only filled with grout, which easily produces micro-cracks after solidification. Rainwater seeps in along the cracks and corrodes the reinforcing bars. In addition, the bolts are directly exposed to the air, and rainwater or moisture comes into contact with the metal surface, causing oxidation and rust expansion, which reduces the preload. Utility Model Content

[0005] To address the problems mentioned in the background art, where existing prefabricated floor slabs, although partially prefabricated, often rely on welding or grouting for connection nodes, with grout filling only at rebar lap joints, are prone to micro-cracks after solidification. Rainwater seeps into these cracks, corroding the rebar, and bolts are directly exposed to air, leading to oxidation and rust expansion from rainwater or moisture contact with the metal surface, thus reducing preload. This invention provides a prefabricated composite floor slab.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated composite floor slab, comprising a floor slab body, a sealing cover plate and a sealing plate, wherein a casting cavity is provided inside the floor slab body, and the top opening of the casting cavity is covered by the sealing cover plate;

[0007] The floor slab body has a side-connecting slot on one side and a locking block that matches the side-connecting slot fixed on the other side. An extension column is fixed at the front end of the floor slab body and a docking slot corresponding to the extension column is opened at the rear end of the floor slab body. The top of the encapsulation cover plate has a screw hole, a positioning screw is installed in the screw hole, and a sealing plate is fastened above the positioning screw.

[0008] As a preferred embodiment of the prefabricated composite floor slab of this utility model, the casting cavity is fixed with reinforcing steel bars.

[0009] As a preferred embodiment of the prefabricated composite floor slab of this utility model, the bottom surface of the encapsulation cover plate is provided with a downwardly protruding convex plate, which is engaged and connected with the side wall of the casting cavity.

[0010] As a preferred embodiment of the prefabricated composite floor slab of this utility model, the four corners of the encapsulation cover plate are provided with inclined fixing rods, and the lower ends of the fixing rods are anchored inside the floor slab body.

[0011] As a preferred embodiment of the prefabricated composite floor slab of this utility model, the cross-section of the card block is T-shaped, and the side connecting slot is a matching T-shaped sliding groove.

[0012] As a preferred embodiment of the prefabricated composite floor slab of this utility model, a threaded sleeve is pre-embedded inside the extension column, and the positioning screw passes through the screw hole and is threadedly connected to the extension column through the threaded sleeve.

[0013] As a preferred embodiment of the prefabricated composite floor slab of this utility model, the bottom of the sealing plate is fixedly connected to a plug-in block, and the surface of the encapsulation cover plate is provided with a plug-in groove that mates with the plug-in block.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: In this application, the four corner fixing rods form an oblique tie, which together with the steel mesh in the casting cavity enhances the shear resistance. The insertion design of the extension column and the docking groove disperses the longitudinal load. The integrated cover plate eliminates the on-site sealing process, shortens the construction period. The sealing plate and the glue sealing layer double block the contact between water and oxygen, extending the life of the bolt. The mechanical engagement between the convex plate and the casting cavity prevents water seepage from the cover plate, prevents the formation of micro-cracks at the steel reinforcement lap joint after solidification, prevents rainwater from seeping into the cracks and corroding the steel reinforcement, and prevents the bolts from being directly exposed to the air, causing oxidation and rust expansion due to rainwater or moisture contact with the metal surface. Attached Figure Description

[0015] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a structural schematic diagram of the floor slab body and the encapsulation cover plate of this utility model;

[0018] Figure 3 This is a schematic diagram of the external structure of this utility model;

[0019] Figure 4 This is a top view of the structure of this utility model;

[0020] Figure 5 This is a schematic diagram of the sealing plate in this utility model.

[0021] In the diagram: 1. Floor slab body; 2. Encapsulation cover plate; 3. Side connection slot; 4. Locking block; 5. Fixing rod; 6. Protruding plate; 7. Casting cavity; 8. Reinforcing steel bar; 9. Butt joint groove; 10. Extension column; 11. Screw hole; 12. Positioning screw; 13. Sealing plate; 14. Insertion block; 15. Insertion groove. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Embodiment 1

[0023] like Figures 1-5 As shown;

[0024] A prefabricated composite floor slab includes a floor slab body 1, a sealing cover 2, and a sealing plate 13. The floor slab body 1 has a casting cavity 7 inside, and the top opening of the casting cavity 7 covers the sealing cover 2. The floor slab body 1 has a side connection groove 3 on one side and a locking block 4 that matches the side connection groove 3 fixed on the other side. An extension column 10 is fixed at the front end of the floor slab body 1, and a docking groove 9 corresponding to the extension column 10 is opened at the rear end of the floor slab body 1. The top of the sealing cover 2 has a screw hole 11, a positioning screw 12 is installed in the screw hole 11, and the sealing plate 13 is fastened above the positioning screw 12.

[0025] In this implementation plan: the four corner fixing rods 5 form an oblique tie, which together with the steel mesh in the casting cavity 7 enhances the shear resistance; the insertion design of the extension column 10 and the connecting groove 9 disperses the longitudinal load; the integrated cover plate eliminates the on-site sealing process and shortens the construction period; the sealing plate 13 and the glue sealing layer double block the contact between water and oxygen, extending the life of the screw; the mechanical engagement of the protruding plate 6 and the casting cavity 7 prevents water seepage from the cover plate.

[0026] In an optional embodiment, reinforcing steel bars 8 are fixed inside the casting cavity 7.

[0027] In this implementation plan: the reinforcing steel bars 8 pre-embedded in the factory form a three-dimensional steel mesh in the pouring cavity 7, which improves the bending strength compared with the traditional single-layer reinforcement. The steel mesh is integrally formed with the poured concrete, avoiding misalignment during on-site binding and reducing the risk of shrinkage cracks.

[0028] In an optional embodiment, the bottom surface of the encapsulation cover plate 2 is provided with a downwardly protruding convex plate 6, which engages with the side wall of the casting cavity 7.

[0029] In this implementation plan: the convex plate 6 is embedded in the cavity wall to form a mechanical interlock, blocking the upward path of water vapor, and the locking structure shares the external load of the cover plate to avoid the cover plate falling off due to impact.

[0030] In an optional embodiment, the four corners of the encapsulation cover plate 2 are provided with inclined fixing rods 5, and the lower ends of the fixing rods 5 are anchored inside the floor slab body 1.

[0031] In this implementation plan: the fixed rods form triangular supports at an inclination angle of 545°-60°, which improves shear resistance and resists floor slab slippage and deformation. The lower end of the rods is welded to the steel mesh node to transfer local stress to the overall structure.

[0032] In an optional embodiment, the card block 4 has a T-shaped cross-section, and the side-connecting card slot 3 is a matching T-shaped sliding groove.

[0033] In this implementation plan: the card block 4 provides tactile feedback when inserted into the card slot, eliminating the need for visual alignment during high-altitude operations. The T-shaped guide rail sliding connection enables self-guidance, and the T-shaped structure naturally resists vertical separation forces, meeting the requirements of strong wind and earthquake conditions.

[0034] In an optional embodiment, a threaded sleeve is pre-embedded inside the extension column 10, and the positioning screw 12 passes through the screw hole 11 and is threadedly connected to the extension column 10 through the threaded sleeve.

[0035] In this implementation plan: the node fastening is completed by screwing the positioning screw 12 into the pre-embedded sleeve. The single-point operation is quick, and the pre-embedded depth of the sleeve controls the screw insertion amount to ensure that the adjacent floor slabs are under uniform pressure.

[0036] In an optional embodiment, a plug-in block 14 is fixedly connected to the bottom of the sealing plate 13, and the surface of the encapsulation cover plate 2 is provided with a plug-in groove 15 that mates with the plug-in block 14.

[0037] In this implementation scheme: the plug block 14 is pressed into the groove to block the intrusion of external water and oxygen, the groove is filled with glue to fill the gap between the screws to form a permanent anti-seepage layer, the sealing plate 13 covers the end of the screw, mechanically blocks the thread retraction caused by vibration, the metal screw is completely isolated from the environment, and the corrosion rate is low.

[0038] Working principle:

[0039] Prefabrication involves prefabricating the floor slab body 1 in the factory, with a pre-reserved through-type casting cavity 7 inside. Multiple reinforcing steel bars 8 are welded into a steel mesh and placed into the casting cavity 7 as a whole. Concrete is poured into the casting cavity 7, vibrated to compact, and then cured. A cover plate 2 is placed over the opening of the casting cavity 7, with its bottom protruding plate 6 embedded in the groove of the cavity wall to achieve a locking action. After the concrete solidifies, it is fixed to the cover plate as a whole. Four fixing rods 5 are inserted obliquely into the pre-reserved holes at the four corners of the cover plate, and the lower ends of the rods are anchored to the steel mesh inside the floor slab body 1 to form a triangular support reinforcement structure.

[0040] When splicing horizontally and connecting left and right, the locking block 4 on the side of the A floor slab is slid horizontally into the side connecting slot 3 of the B floor slab to achieve lateral positioning. When connecting front and back, the extension column 10 at the front end of the A floor slab is inserted into the connecting slot 9 at the rear end of the B floor slab to ensure longitudinal axis alignment. Through the mortise and tenon structure of the locking block 4 and the side connecting slot 3, and the insertion and cooperation of the extension column 10 and the connecting slot 9, bidirectional precise positioning is achieved.

[0041] For node fastening and sealing, the positioning screw 12 is vertically inserted into the screw hole 11 on the top of the cover plate, passing through the threaded sleeve built into the extension column 10, and tightened to lock the adjacent floor slab. The sealing plate 13 is fastened to the exposed end of the positioning screw 12, and the insertion block 14 at its bottom is pressed into the insertion groove 15 on the surface of the cover plate. Epoxy resin is injected into the insertion groove 15, and the resin seeps into the gap between the positioning screw 12 and the screw hole 11 along the guide channel of the insertion block 14. After curing, a double sealing barrier is formed to block the path of water vapor erosion.

[0042] The sealing plate 13 provides overall protection, completely covering the positioning screw 12. This prevents the screw from loosening or shifting, and also avoids external rainwater intrusion that could cause corrosion, ensuring the long-term stability of the connection node.

[0043] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A prefabricated composite floor slab, comprising a floor slab body (1), a sealing cover plate (2), and a sealing plate (13), characterized in that: The floor slab body (1) has a casting cavity (7) inside, and the top opening of the casting cavity (7) is covered by a sealing cover plate (2). The floor slab body (1) has a side connection slot (3) on one side and a card block (4) matching the side connection slot (3) fixed on the other side. An extension column (10) is fixed at the front end of the floor slab body (1) and a docking slot (9) corresponding to the extension column (10) is opened at the rear end of the floor slab body (1). A screw hole (11) is provided on the top of the encapsulation cover plate (2). A positioning screw (12) is installed in the screw hole (11) and a sealing plate (13) is fastened above the positioning screw (12).

2. The prefabricated composite floor slab according to claim 1, characterized in that: The casting cavity (7) is fixed with reinforcing steel bars (8).

3. The prefabricated composite floor slab according to claim 1, characterized in that: The bottom surface of the encapsulation cover (2) is provided with a downward protruding plate (6), which is engaged with the side wall of the casting cavity (7).

4. The prefabricated composite floor slab according to claim 1, characterized in that: The four corners of the encapsulation cover plate (2) are provided with inclined fixing rods (5), and the lower end of the fixing rods (5) is anchored inside the floor slab body (1).

5. The prefabricated composite floor slab according to claim 1, characterized in that: The card block (4) has a T-shaped cross section, and the side-connecting card groove (3) is a matching T-shaped sliding groove.

6. The prefabricated composite floor slab according to claim 1, characterized in that: The extension column (10) has a pre-embedded threaded sleeve inside, and the positioning screw (12) passes through the screw hole (11) and is threadedly connected to the extension column (10) through the threaded sleeve.

7. The prefabricated composite floor slab according to claim 1, characterized in that: The bottom of the sealing plate (13) is fixedly connected to a plug block (14), and the surface of the encapsulation cover plate (2) is provided with a plug groove (15) that cooperates with the plug block (14).

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