Prefabricated hollow floor structure
By using truss and drum-shaped core mold structures in hollow floor covers, the problem of time-consuming and impure filling of core molds is solved, and more efficient concrete filling and floor strength improvement is achieved, reducing construction complexity.
Patent Information
- Application Number
- CN202422568081.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-23
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-10-23
AI Technical Summary
During the construction of existing hollow floors, the core mold is time-consuming and labor-intensive, easy to deviate and misalign, and the concrete filling is not solid, affecting the strength of the floor.
The truss and drum-shaped core molds are arranged on the laminated plate. The truss is composed of the upper chord rod and the belly rod. The belly rod is continuously bent steel bars, and the outer periphery is wrapped in the UHPC layer. The outer periphery of the drum-shaped core mold is an arc curved surface. Reinforcement bars and connection bayonets are set, and the UHPC wrapping layer is flush with the laminated plate, which increases the cross-sectional area and moment of inertia to provide a wider vibration space.
The concrete vibration efficiency is improved, the core mold bottom filling is complete, the floor strength is improved, the material stacking is reduced on the construction site, and the construction efficiency is improved.
Smart Images
Figure CN223226912U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of assembled building engineering, in particular to a prefabricated hollow floor structure. Background Art
[0002] Hollow-core floor slabs are cast-in-place reinforced concrete hollow floor slabs. They have the advantages of being light in weight, saving raw materials, having a low overall construction cost, high bending stiffness, good sound insulation, good thermal insulation properties, and good seismic resistance. They are widely used in commercial and residential buildings with large spans. During the construction of existing hollow-core floor slabs, it is necessary to set several core molds between two layers of steel mesh for binding. This construction method is time-consuming and labor-intensive, and the core molds are prone to displacement during binding. In addition, the gaps between the core molds are small, and the concrete in the gaps has poor fluidity. It is difficult to ensure that the bottom of the core molds is completely filled with concrete during vibration, which affects the overall strength of the floor slab after casting. Utility Model Content
[0003] In order to overcome the problems existing in the related technology, the utility model provides a prefabricated hollow floor structure, which can increase the cross-sectional area and cross-sectional inertia moment of the upper chord, improve the efficiency of concrete vibration, and solve the problem of difficulty in completely filling the space between the core mold and the composite plate.
[0004] The utility model provides a prefabricated hollow floor structure, comprising a composite plate, a truss arranged on the composite plate, and a drum-shaped core mold laid on the composite plate;
[0005] The truss includes an upper chord, with webs provided on both sides of the upper chord, the webs being continuously bent steel bars, the top bend of the webs being connected to the upper chord, and a UHPC wrapping layer provided on the outer periphery of the upper chord;
[0006] The drum-shaped core mold includes a drum body and a plate body arranged at both ends of the drum body. The outer periphery of the drum body is arranged in an arc surface. The plate body is provided with reinforcing ribs, a pull ring and a plurality of equally distributed connecting bayonet holes, and the connecting bayonet holes are used to fix the steel bars.
[0007] The top end surface of the drum-shaped core mold is flush with the top end surface of the UHPC wrapping layer.
[0008] In some embodiments, the outer surface of the UHPC wrapping layer is provided with a concave-convex texture; the web is further connected to a lower chord, and the lower chord is in the same direction as the upper chord.
[0009] In some embodiments, the concavo-convex texture is convex points or concave pits randomly distributed on the outer surface of the UHPC wrapping layer.
[0010] In some embodiments, the reinforcing ribs include transverse ribs and longitudinal ribs, and the transverse ribs and the longitudinal ribs are staggered horizontally and vertically to form a grid structure.
[0011] In some embodiments, the spacing between the connecting bayonet holes is 100 mm; the diameter of the plate body is 100 mm to 300 mm, and the thickness is 2 mm to 3 mm; the curvature of the drum body is 60° to 180°.
[0012] In some embodiments, the connecting bayonet includes a snap ring and a fixed shaft, the snap ring is connected to the fixed shaft, a clip is provided at one end of the fixed shaft away from the snap ring, the plate body is provided with a through hole for the fixed shaft to pass through, and the clip is connected to the plate body through the through hole.
[0013] In some embodiments, a rubber layer is further provided on the outer circumference of the fixed shaft.
[0014] In some embodiments, a polyurethane foam layer is further included in the drum body.
[0015] The technical solution provided by the utility model may have the following beneficial effects:
[0016] The prefabricated hollow floor structure provided by the utility model has the upper chord at the top of the composite slab cross section wrapped with UHPC, which increases the cross-sectional area and cross-sectional moment of inertia of the upper chord, and increases the bending deformation capacity of the upper chord structure, so that the cross-sectional stiffness of the composite slab is further improved on the basis of the existing longitudinal steel bars, which is conducive to controlling the deflection deformation of the structure during construction and solving the problem that the existing composite slab needs additional support. A drum-shaped core mold is provided on the composite slab, which has good resistance to heavy pressure. The arc surface can balance the pressure of the concrete around the core mold, making it less likely to collapse and providing a wider operating space for the vibrator, ensuring that the concrete can be fully filled between the core mold and the composite slab, avoiding the problem of incomplete vibration at the bottom of the core mold. Factory assembly is achieved, which can reduce the material stacking at the construction site and effectively improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present invention.
[0018] Figure 1 It is a structural schematic diagram of the prefabricated hollow floor structure shown in the utility model;
[0019] Figure 2 It is a structural schematic diagram of the drum-shaped core mold shown in the present invention;
[0020] Figure 3 It is a schematic structural diagram of drum bodies with different arc curved surfaces shown in the present invention;
[0021] Figure 4It is a structural schematic diagram of the pull ring provided by the utility model.
[0022] Reference numerals:
[0023] 1. Composite plate; 2. Upper chord; 3. Web member; 4. UHPC wrap layer; 5. Lower chord;
[0024] 6. Drum-shaped core mold; 61. Drum body; 62. Plate body; 63. Reinforcement ribs; 64. Pull-out; 65. Connecting bayonet; 650. Snap ring; 651. Fixed shaft. DETAILED DESCRIPTION
[0025] The following describes preferred embodiments of the present invention in more detail with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.
[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0027] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.
[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
[0029] The technical solutions of the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.
[0030] like Figure 1 and Figure 4As shown, an embodiment of the present invention provides a prefabricated hollow floor structure, comprising a composite plate, a truss arranged on the composite plate, and a drum-shaped core mold 6 laid on the composite plate;
[0031] The truss includes an upper chord 2, with webs 3 provided on both sides of the upper chord 2. The webs 3 are continuously bent steel bars, and the top bend of the webs 3 is connected to the upper chord 2. The outer periphery of the upper chord 2 is provided with a UHPC wrapping layer 4.
[0032] The drum-shaped core mold 6 includes a drum body 61 and plates 62 provided at both ends of the drum body 61. The outer periphery of the drum body 61 is arranged in an arc-shaped curved surface. The plates 62 are provided with reinforcing ribs 63, a pull ring and a plurality of equally spaced connecting bayonet holes 65. The connecting bayonet holes 65 are used to fix the steel bars.
[0033] The top end surface of the drum-shaped core mold 6 is flush with the top end surface of the UHPC wrapping layer 4 .
[0034] UHPC is a cement-based building material, similar to the conventional concrete used in subsequent pouring. The density of UHPC is much higher than that of conventional concrete, allowing for a tight bond with the steel reinforcement within, meeting the durability requirements of the building structure.
[0035] In this embodiment, the compressive strength of the UHPC wrapping layer 4 is greater than 130 MPa, the steel fiber content is greater than 1.5%, and the tensile strength is greater than 7 MPa.
[0036] For example, the following steps can be used to manufacture the UHPC wrapping layer: 1) Complete the prefabrication of the truss reinforcement on a standard truss reinforcement manufacturing machine. 2) Install the UHPC non-removable formwork mold on the formwork table and cast the UHPC material. 3) Place the truss reinforcement and embedded parts such as the wire box and wire pipe before the UHPC composite plate 1 solidifies. 4) Demold the UHPC composite plate 1 after it reaches the required strength. 5) Fix the silicone mold on the formwork table and seal the ends. 6) Cast the UHPC wrapping layer 4 on the silicone mold. 7) Before the UHPC wrapping layer 4 initially solidifies, flip the composite plate over and place it in the silicone mold so that the upper chord 2 is immersed in the UHPC wrapping layer 4. 8) Demold the UHPC wrapping layer 4 after it hardens.
[0037] The drum body 61 is formed by cutting a sphere or an ellipsoid through two parallel planes, and the plate body 62 is covered on the cut surface to form a drum-shaped core mold 6. The outer peripheral surface of the drum body 61 is a circular arc surface. After pouring, the concrete wraps around the drum-shaped core mold 6. The adjacent drum bodies 61 are enclosed to form a space structure with a wide upper end, a wide lower end and a narrow middle end. During vibration, the end of the vibrating rod can be adjusted to multiple angles in the lower end space, so as to facilitate the vibration flow of the concrete around the drum body 61 and accelerate the filling of the concrete to the bottom of the core mold.
[0038] The connecting clips provided on the plate body 62 are used when laying the steel frames intersecting vertically and horizontally on the composite plate. The longitudinal steel bars or transverse steel bars are passed through the connecting clips. The weight of the steel frame itself and the static friction between the steel frame and the concrete provide an anti-buoyancy force for the drum-shaped core mold 6, thereby preventing the drum-shaped core mold 6 from floating up when pouring concrete, resulting in bulging of the concrete layer after solidification.
[0039] On the basis of the above specific embodiments, those skilled in the art can design UHPC wrapping layers 4 with different formation rules according to actual conditions, for example, prismatic, rectangular or irregular three-dimensional structures.
[0040] The prefabricated hollow floor structure provided by the present invention is used as follows: after the composite slabs are assembled on the floor, transversely distributed steel bars are laid on the composite slabs. Then, drum-shaped core molds 6 are placed at intervals on the composite slabs. The drum-shaped core molds 6 are evenly distributed within the floor to prevent uneven floor quality. Longitudinal steel bars are laid. When laying the longitudinal steel bars, the connecting clips 65 of the drum-shaped core molds 6 are passed through so that the drum-shaped core molds 6 can be fixed to the longitudinal steel bars. The longitudinal steel bars are tied to the transverse steel bars by steel wire or welding. Then, the steel bar structure on top of the drum-shaped core molds 6 is laid, and concrete is poured. After the concrete solidifies, the hollow floor is formed.
[0041] Furthermore, the outer surface of the UHPC wrapping layer 4 of the above-mentioned prefabricated hollow floor structure is provided with a concave-convex texture; the web member 3 is also connected to the lower chord 5, and the lower chord 5 is in the same direction as the upper chord 2.
[0042] Furthermore, the concave-convex texture of the above-mentioned prefabricated hollow floor structure is convex points or concave pits randomly distributed on the outer surface of the UHPC wrapping layer 4.
[0043] The outer UHPC wrap layer 4 features a surface texture treatment to enhance adhesion with the post-cast concrete, facilitating the coordinated load-bearing of the internal reinforcement, the outer UHPC wrap layer, and the post-cast concrete. Correspondingly, the surface texture can also be configured in the form of wavy, spiral, or stepped patterns, primarily to increase the surface area of the UHPC wrap layer 4.
[0044] Specifically, the concave-convex texture of this solution can be achieved by prefabricating the template for the UHPC wrap layer 4 with a textured silicone material. This can achieve the concave-convex texture of the UHPC wrap layer 4. The silicone material's softness allows for rapid demolding, resolving the difficulty associated with wooden and steel formwork.
[0045] In a preferred embodiment, the prefabricated hollow floor structural reinforcement ribs 63 comprise transverse and longitudinal ribs, which are interlaced to form a grid structure. The reinforcement ribs 63 on the slab 62 enhance its bending resistance, preventing it from bending when construction workers step on the drum-shaped core mold 6.
[0046] The drum-shaped core mold 6 is made of thermoplastic materials, such as polystyrene, polyvinyl chloride and other materials, which have the characteristics of light weight, good flexibility and excellent chemical stability. The transverse ribs and longitudinal ribs can be set on the inner surface or outer surface of the plate body 62. The transverse ribs and longitudinal ribs and the plate body 62 can be integrally injection molded.
[0047] The drum-shaped core mold 6 composed of the plate body 62 and the drum body 61 is a hollow structure, and the arc surface of the drum body 61 has strong anti-bending performance; and a certain point of the arc surface itself can be concave inward. Therefore, in order to improve the utilization rate of the storage space of the drum-shaped core mold 6, the drum body 61 can be concave inward by the action of external force before being installed on the composite plate, thereby reducing the overall spatial size of the drum-shaped core mold 6, and making it easier to stack more drum-shaped core molds 6 in a certain storage space. If the drum body 61 is accidentally crushed during installation, the drum body 61 can be restored to its original shape through the pull ring.
[0048] Further, if Figure 3 As shown, the spacing between the connecting tabs 65 of the prefabricated hollow floor structure is 100 mm; the diameter of the plate 62 is 100 mm to 300 mm, and the thickness is 2 mm to 3 mm; the curvature of the drum body 61 is 60° to 180°. The curvature of the arc surface is within the range of 60° to 180°. The smaller the curvature of the arc surface, the closer it is to a cylinder. When the curvature of the arc surface reaches 180°, it can be considered a semicircle.
[0049] Further, if Figure 4 As shown, the connecting bayonet 65 of the above-mentioned prefabricated hollow floor structure includes a clamping ring 650 and a fixed shaft 651. The clamping ring 650 is connected to the fixed shaft 651. A clamp is provided at the end of the fixed shaft 651 away from the clamping ring 650. A through hole is provided on the plate body 62 for the fixed shaft 651 to pass through. The clamp is clamped with the plate body 62 through the through hole.
[0050] Furthermore, a rubber layer is provided on the outer periphery of the fixed shaft 651 of the prefabricated hollow floor structure. By providing the rubber layer on the fixed shaft 651, the structure of the drum-shaped core mold 6 is made waterproof, and water can be prevented from penetrating into the drum-shaped core mold 6.
[0051] Furthermore, to enhance the wall's thermal insulation and noise reduction capabilities, the prefabricated hollow floor structure also includes a polyurethane foam layer within the drum body 61. In practice, a needle for delivering polyurethane foam can be inserted into the through-hole, and a certain amount of polyurethane foam can be poured into the cavity of the drum body 61. The polyurethane foam forms a foam layer within the cavity, enhancing the thermal insulation and noise reduction capabilities of the drum core mold 6.
[0052] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.
[0053] While various embodiments of the present invention have been described above, the above descriptions are illustrative and non-exhaustive, and are not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to existing technologies, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A prefabricated hollow floor structure, characterized in that: It comprises a laminated plate (1), a truss arranged on the laminated plate (1), and a drum-shaped core mold (6) laid on the laminated plate (1); The truss comprises an upper chord (2), webs (3) are provided on both sides of the upper chord (2), the webs (3) are continuously bent steel bars, the top bend of the webs (3) is connected to the upper chord (2), and a UHPC wrapping layer (4) is provided on the outer periphery of the upper chord (2); The drum-shaped core mold (6) includes a drum body (61) and plates (62) arranged at both ends of the drum body (61). The outer periphery of the drum body (61) is arranged in a circular arc surface. The plate body (62) is provided with reinforcing ribs (63), a pull ring and a plurality of equally spaced connecting bayonet holes (65). The connecting bayonet holes (65) are used to fix steel bars. The top end surface of the drum-shaped core mold (6) is flush with the top end surface of the UHPC wrapping layer (4).
2. The prefabricated hollow floor structure according to claim 1, characterized in that: The outer surface of the UHPC wrapping layer (4) is provided with a concave-convex texture; the web (3) is also connected to a lower chord (5), and the lower chord (5) is in the same direction as the upper chord (2).
3. The prefabricated hollow floor structure according to claim 2, characterized in that: The concavo-convex texture is convex points or concave pits randomly distributed on the outer surface of the UHPC wrapping layer (4).
4. The prefabricated hollow floor structure according to claim 3, characterized in that: The reinforcing ribs (63) include transverse ribs and longitudinal ribs, and the transverse ribs and longitudinal ribs are staggered horizontally and vertically to form a grid structure.
5. The prefabricated hollow floor structure according to claim 1, characterized in that: The spacing between the connecting bayonet holes (65) is 100 mm; the diameter of the plate body (62) is 100 mm to 300 mm, and the thickness is 2 mm to 3 mm; the curvature of the drum body (61) is 60° to 180°.
6. The prefabricated hollow floor structure according to claim 1, characterized in that: The connecting bayonet (65) comprises a snap ring (650) and a fixed shaft (651), the snap ring (650) is connected to the fixed shaft (651), a clip is provided at one end of the fixed shaft (651) away from the snap ring (650), the plate body (62) is provided with a through hole for the fixed shaft (651) to pass through, and the clip is snap-connected to the plate body (62) through the through hole.
7. The prefabricated hollow floor structure according to claim 6, characterized in that: The outer periphery of the fixed shaft (651) is further provided with a rubber layer.
8. The prefabricated hollow floor structure according to claim 7, characterized in that: It also includes a polyurethane foam layer filled in the drum body (61).