A prefabricated composite floor
By installing prestressed clamps and tensioning prestressed strands on precast composite floor slabs, the support problem during assembly and pouring is solved, enabling precast composite floor slabs with no or reduced support, reducing costs and construction time, and freeing up space below.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUBEI VOCATIONAL & TECH COLLEGE OF URBAN CONSTR
- Filing Date
- 2025-07-17
- Publication Date
- 2026-06-16
AI Technical Summary
Existing precast composite floor slabs require additional support structures during assembly and pouring, leading to increased costs and extended construction periods, as well as occupying space below.
The design employs prestressed clamps and prestressed strands. By installing prestressed clamps on the composite slab and tensioning the prestressed strands, the precast composite floor slab arches before pouring, offsetting the weight of the concrete and reducing or eliminating the need for the supporting structure below.
This reduces or eliminates additional support structures, lowers construction costs, shortens the construction period, frees up space below, and improves construction efficiency.
Smart Images
Figure CN224363514U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a prefabricated composite floor slab, belonging to the field of prefabricated building technology. Background Technology
[0002] Prefabricated buildings are becoming the mainstream direction of modern construction industry development due to their advantages such as high efficiency, environmental protection, and controllable quality.
[0003] Although precast composite floor slabs can be assembled without formwork, they require secondary pouring after assembly to integrate with the building structure (mainly shear walls). Before the concrete hardens, a supporting structure needs to be installed under the precast composite floor slab to support its own weight. This supporting structure can only be removed after the concrete has initially set and reached a certain strength. The additional supporting structure not only increases costs and occupies more than 30% of the construction time, but also occupies the passage space under the precast composite floor slab.
[0004] Therefore, existing precast composite floor slabs require additional support during assembly and pouring. Utility Model Content
[0005] The purpose of this application is to overcome the shortcomings of the prior art and provide a precast composite floor slab that requires no or reduces additional support during assembly and casting, thereby freeing up space below.
[0006] To achieve the above objectives, this application employs the following technical solution:
[0007] This application provides a precast composite floor slab, comprising,
[0008] The composite slab body is reinforced with multiple truss steel bars;
[0009] The prestressed clamps and prestressed strands are provided, wherein the prestressed strands are arranged along the extension direction of the truss reinforcement, and both ends of the prestressed strands are installed on the composite slab through the prestressed clamps and exert an arching tensioning effect on the composite slab.
[0010] In some embodiments of this application, the prestressed clamps are respectively disposed on the two end faces of the composite plate in the direction of extension of the truss reinforcement.
[0011] In some embodiments of this application, the prestressed strand is provided at intervals of a certain number of longitudinal reinforcing bars in the composite slab.
[0012] In some embodiments of this application, the spacing between adjacent prestressed strands is 300 mm.
[0013] In some embodiments of this application, the joints between adjacent laminated panels are provided with mutually cooperating upper convex tongue and lower concave tongue.
[0014] In some embodiments of this application, the mating surface between the upper convex tongue and the lower concave tongue is a Z-shaped cross-section.
[0015] In some embodiments of this application, the composite plate body is provided with a sunken support at the edge for connection with the shear wall, the sunken support matching the placement notch reserved in the shear wall.
[0016] In some embodiments of this application, the placement width of the sunken support is not less than 100mm.
[0017] In some embodiments of this application, through holes for inserting reinforcing bars are provided in the composite plate body at the positions of the reserved shear wall reinforcing bars.
[0018] Compared with the prior art, the beneficial effects achieved by this application are as follows:
[0019] The manufacturing process of the precast composite floor slab provided in this application is similar to that of traditional precast composite floor slabs. However, the difference lies in the following: after the erection of the truss reinforcement and the erection of the longitudinal reinforcement, transverse reinforcement, end beam longitudinal reinforcement, and end beam stirrups within the composite slab body, prestressing clamps are installed on both sides of the precast composite floor slab semi-finished product along the extension direction of the longitudinal reinforcement of the composite slab. Prestressing strands are tensioned between the prestressing clamps at both ends, and then the composite slab body is poured to obtain the finished precast composite floor slab. Under the tension force of the prestressing strands, the precast composite floor slab arches. After the precast composite floor slab is initially assembled with the shear wall, during the secondary pouring of the precast composite floor slab, the arching stress caused by the tensioning of the prestressing strands can offset or reduce the gravity of the concrete. This can reduce or completely eliminate the support structure under the precast composite floor slab used to support the uncured concrete, thereby reducing construction costs, shortening construction procedures, and freeing up space below. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a schematic axonometric drawing of the prefabricated composite floor slab provided in this embodiment;
[0022] Figure 2 yes Figure 1 A schematic diagram of the steel mesh;
[0023] Figure 3 yes Figure 1A structural diagram showing the pre-fabricated composite floor slabs initially assembled onto the shear wall before secondary pouring;
[0024] Figure 4 Structural schematic diagram of the cross-section of adjacent precast composite floor slabs;
[0025] In the diagram: 1- Composite slab body; 2- Truss reinforcement; 3- Prestressed strand; 4- Prestressed clamp; 5- Longitudinal reinforcement of composite slab; 6- Longitudinal reinforcement of end beam; 7- Upper protruding tongue and groove; 8- End beam; 9- Through hole for dowel bar; 10- End beam stirrup; 11- Shear wall; 12- Lower recessed tongue and groove; 13- Dowel bar for shear wall; 14- Horizontal reinforcement of composite slab; 15- Sunken support. Detailed Implementation
[0026] The technical solutions of this application / the embodiments thereof will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application / the embodiments thereof, and not all embodiments thereof. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application / the application thereof or its application or use. Example 1
[0027] This embodiment provides a precast composite floor slab to solve the problem in the prior art that precast composite floor slabs require additional support to be erected in the space below during assembly and pouring.
[0028] refer to Figures 1 to 4 The precast composite floor slab provided in this embodiment includes,
[0029] The composite slab body 1 is equipped with multiple truss steel bars 2;
[0030] The prestressed clamp 4 and the prestressed strand 3 are arranged along the extension direction of the truss reinforcement 2. The two ends of the prestressed strand 3 are installed on the composite slab body 1 through the prestressed clamp 4 and exert an arching tensioning effect on the composite slab body 1.
[0031] The manufacturing process of the precast composite floor slab provided in this embodiment is similar to that of the traditional precast composite floor slab. However, the difference from the traditional precast composite floor slab manufacturing method is that after the erection of the truss reinforcement 2 and the erection of the composite slab longitudinal reinforcement 5, composite slab transverse reinforcement 14, end beam longitudinal reinforcement 6, and end beam stirrup 10 in the composite slab body 1 are completed, prestressed clamps 4 are installed on both sides of the precast composite floor slab semi-finished product along the extension direction of the composite slab longitudinal reinforcement 5, and prestressed strands 3 are tensioned between the prestressed clamps 4 at both ends. Then, the composite slab body 1 is poured to obtain the finished precast composite floor slab. Under the tension of the prestressed strand 3, the precast composite floor slab arches. After the precast composite floor slab is initially assembled with the shear wall 11, the arching stress caused by the tension of the prestressed strand 3 can offset or reduce the gravity of the concrete during the secondary pouring of the precast composite floor slab. This can reduce or completely eliminate the support structure under the precast composite floor slab used to support the uncured concrete, thereby reducing construction costs, shortening construction procedures, and freeing up space below. Example 2
[0032] This embodiment provides a precast composite floor slab. This embodiment is an optimization based on Embodiment 1 to improve the technical effect and refine the technical solution. For details not described in this embodiment, please refer to Embodiment 1.
[0033] Since the prestressed strands 3 are installed using the pre-tensioning method, as one embodiment, the truss reinforcement 2 has a certain ability to support the structural stability. The prestressing clamps 4 are respectively set on both ends of the composite slab 1 in the extension direction of the truss reinforcement 2. The truss reinforcement 2 supports the steel structure of the precast composite floor slab, reducing the negative impact of the tension of the prestressed strands 3 on the steel structure before the first pouring of the composite slab 1.
[0034] In one embodiment, when arranging the prestressed strands 3, one prestressed strand 3 is placed at regular intervals of the longitudinal reinforcement 5 of the composite slab, and the longitudinal reinforcement 5 of the composite slab, the prestressed strands 3, and the truss reinforcement 2 are arranged in parallel. (Reference) Figure 4 Prestressed strand 3 is installed every two longitudinal steel bars 5 of the composite slab.
[0035] In one embodiment, the spacing between adjacent prestressed strands 3 is controlled at around 300mm.
[0036] During the secondary casting of the composite slab body 1, grout leakage is prone to occur at the joints between adjacent composite slab bodies 1. This leakage creates honeycomb defects, weakening the shear strength of the joints, and necessitates secondary repairs at the bottom of the slab, affecting structural durability and appearance quality. To overcome this problem, as one embodiment, refer to... Figure 4The joints between adjacent composite slabs 1 are respectively provided with mutually cooperating upper convex tongue and groove 7 and lower concave tongue and groove 12. During assembly, the joints between adjacent composite slabs 1 cooperate with each other. During the secondary pouring of composite slabs 1, the complex mating surface between the upper convex tongue and groove 7 and the lower concave tongue and groove 12 can significantly reduce the leakage of cement slurry. As one embodiment, the mating surface is a Z-shaped cross-section, with two vertical sections of 30mm in length and a cross section of 20mm.
[0037] One pair of edges of the precast composite slab 1 is spliced with the adjacent precast composite slab 1, while the other pair of edges is spliced with the shear wall 11. To ensure sufficient stability of the precast composite floor slab during secondary pouring until the initial setting of the concrete, as one embodiment, refer to... Figure 1 The composite slab 1 has a sunken support 15 at the edge for connection with the shear wall 11, and the sunken support 15 matches the reserved support notch in the shear wall 11.
[0038] In use, the sunken supports 15 on both sides of the composite slab 1 match the pre-reserved support notches in the shear wall 11, allowing the concrete poured on the composite slab 1 to be stably transferred to the shear wall 11 through the sunken supports 15. Furthermore, the matching between the sunken supports 15 and the pre-reserved support notches in the shear wall 11 also facilitates the fixation of the composite slab 1. Those skilled in the art will readily recognize that the sunken supports 15 are located on the composite slab 1 away from the truss reinforcement 2.
[0039] As one embodiment, the support width of the sunken support 15 is not less than 100mm. Compared with the traditional composite slab support length of 10mm, the sunken support 15 with a support width of 100mm can provide a larger support surface and prevent the precast composite floor slab from falling off the shear wall 11.
[0040] As one embodiment, reference Figure 3 and Figure 4 For the composite slab body 1, through holes 9 are opened at the positions corresponding to the reserved shear wall reinforcement bars 13. In the prefabricated type, the shear wall reinforcement bars 13 are inserted into the through holes 9 to stabilize the position of the composite slab body 1. After the pouring is completed, the shear wall reinforcement bars 13 and the newly poured surface of the prefabricated composite floor slab form sufficient steel reinforcement-concrete contact.
[0041] Figure 1 The dimensions of the middle composite plate 1 are 4000*2370*60mm. As one embodiment, see reference... Figure 2The main steel reinforcement mesh within the composite slab body 1 is primarily composed of intersecting horizontal and vertical composite slab horizontal steel bars 14 and longitudinal composite slab steel bars 5. A portion of the truss steel bars 2 is inserted into the reinforcement mesh, while the other portion protrudes from the main reinforcement mesh. The sunken support 15 is integrated into the lower part of the end beam 8. The cross-sectional dimensions of the end beam 8 are typically 100*100mm. The end beam 8 is reinforced at both ends of the main reinforcement mesh, consisting of four end beam longitudinal bars 6 and end beam stirrups 10. The end beam longitudinal bars 6 are made of grade III steel with a diameter of 8mm. An end beam stirrup 10 is installed every 200mm, made of grade I steel with a diameter of 6mm.
[0042] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0043] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," "located in," "equipped with," "located in," "installed," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. "Hinged connection" includes "rotational connection."
[0044] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A precast composite floor slab, characterized in that, include, The composite slab body (1) is provided with multiple truss steel bars (2); The prestressed clamp (4) and the prestressed strand (3) are arranged along the extension direction of the truss reinforcement (2). The two ends of the prestressed strand (3) are installed on the composite plate (1) through the prestressed clamp (4) and exert an arching tensioning effect on the composite plate (1).
2. The precast composite floor slab according to claim 1, characterized in that, The prestressed clamps (4) are respectively located on both ends of the composite plate (1) in the extension direction of the truss reinforcement (2).
3. The precast composite floor slab according to claim 2, characterized in that, The prestressed strand (3) is provided at intervals of a certain number of longitudinal steel bars (5) in the composite slab.
4. The precast composite floor slab according to claim 2, characterized in that, The spacing between adjacent prestressed strands (3) is 300 mm.
5. The precast composite floor slab according to claim 1, characterized in that, The joints between adjacent stacked panels (1) are respectively provided with upper convex tongue and groove (7) and lower concave tongue and groove (12) that cooperate with each other.
6. The precast composite floor slab according to claim 5, characterized in that, The mating surface between the upper convex tongue (7) and the lower concave tongue (12) is a Z-shaped cross section.
7. The precast composite floor slab according to claim 1, characterized in that, The composite plate (1) is provided with a sunken support (15) at the edge for connection with the shear wall (11), the sunken support (15) matching the reserved support notch of the shear wall (11).
8. The precast composite floor slab according to claim 7, characterized in that, The placement width of the sunken support (15) is not less than 100mm.
9. The precast composite floor slab according to claim 7, characterized in that, The composite slab (1) has through holes (9) for inserting reinforcing bars at the positions corresponding to the reserved shear wall reinforcing bars (13).