A prefabricated composite floor structure
By introducing embedded pipes and prestressed strands into the precast composite floor slab, the camber stress is used to offset the weight of the concrete, solving the problems of additional support and insufficient bending stiffness, and realizing the efficient fabrication of precast composite floor slab structures.
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
- 2026-06-05
AI Technical Summary
Existing precast composite floor slab structures require additional support during assembly, leading to increased costs and extended construction periods. They also exhibit poor bending stiffness, which is particularly evident when the steel mesh density is insufficient or the concrete strength is low.
The design employs pre-embedded pipes and prestressed strands, and uses prestressed clamps to adjust the arching stress, offsetting the gravity of the concrete during assembly and pouring, reducing the need for additional support, and enhancing the structural strength through truss reinforcement and bottom rib beams.
It effectively reduces the need for additional support during assembly and pouring, lowers the strength requirements for precast composite slabs, and improves the bending stiffness of the structure. It is suitable for the production of floor slabs with insufficient steel mesh density or low concrete strength.
Smart Images
Figure CN224325937U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a prefabricated composite floor slab structure, 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 slab structures can be assembled without formwork, they require secondary pouring after assembly to become integrated with the building structure (mainly shear walls). Before the concrete hardens, a supporting structure needs to be installed under the precast composite floor slab structure to support the self-weight of the concrete. This supporting structure can only be removed after the concrete has initially set and reached a certain strength. This additional supporting structure not only increases costs and reduces construction time by more than 30%, but also occupies the passage space under the precast composite floor slab. Furthermore, precast composite floor slab structures with insufficient reinforcement mesh density or low concrete strength have poor flexural stiffness.
[0004] Therefore, some precast composite floor slabs have the problem of poor bending stiffness of precast structures and the need for 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 structure that has lower requirements for the strength of the precast structure and reduces the need for additional support during assembly and casting.
[0006] To achieve the above objectives, this application employs the following technical solution:
[0007] This application provides a precast composite floor slab structure, including,
[0008] Precast composite panels;
[0009] Embedded pipes are installed inside the prefabricated composite slab.
[0010] Prestressed strands, passing through both ends of the embedded pipe, are used to apply arching stress to the precast composite slab. The ends of the prestressed strands are also provided with prestressed clamps with adjustable tensile stress.
[0011] A pad is provided on the precast composite slab body, and the pad supports the precast composite slab body so that the height of the prestressed clamp is not lower than that of the first shear wall.
[0012] In some embodiments of this application, the embedded pipe is arranged parallel to the longitudinal reinforcement of the composite slab, and an embedded pipe is set at intervals of a certain number of longitudinal reinforcements of the composite slab.
[0013] In some embodiments of this application, through holes for inserting reinforcing bars are provided in the prefabricated composite slab at the positions of the reserved shear wall reinforcing bars.
[0014] In some embodiments of this application, the precast composite slab body is provided with a reinforcement through-hole encryption zone that matches the reinforcement of the corner section within a certain range from the corner.
[0015] In some embodiments of this application, the pad matches the placement notch reserved in the first shear wall, and the placement width of the pad is not less than 100mm.
[0016] In some embodiments of this application, the spacing between adjacent embedded pipes is 300 mm.
[0017] In some embodiments of this application, the precast composite slab has multiple truss reinforcement bars on the side facing away from the first shear wall, and multiple bottom rib beams on the side of the precast composite slab close to the first shear wall; the truss reinforcement bars are distributed parallel to the bottom rib beams.
[0018] In some embodiments of this application, a composite middle plate spliced with the prefabricated composite slab body is also included; the joint section between the prefabricated composite slab body and the composite middle plate is a Z-shaped section.
[0019] Compared with the prior art, the beneficial effects achieved by this application are as follows:
[0020] The precast composite floor slab structure provided in this application involves laying a steel mesh around the precast composite slab during fabrication, then placing the embedded pipes within the mesh according to the design. After the initial pouring of the precast composite slab, the embedded pipes are fixed within it. Before assembly pouring, the precast composite slab rests on the first shear wall using supports. The height of the supports ensures that the pipe opening height exceeds that of the first shear wall. Prestressed strands pass through the embedded pipes, with each strand located at one end. Adjustable prestressing clamps are installed at both ends of the prestressed strands. During the assembly and pouring of precast composite floor slab structures, the camber stress applied to the precast composite slab body by the prestressed strands is gradually increased by controlling the prestressed clamps. The camber stress is used to offset the gravity of the assembled and poured concrete, thereby reducing the need for additional support during assembly and pouring. Moreover, the camber stress is adjustable and can gradually increase as the concrete is poured, offsetting the gravity of the concrete and reducing the strength requirements of the precast composite slab body. It is suitable for the production of floor slabs with insufficient steel mesh density or low concrete strength. Attached Figure Description
[0021] 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.
[0022] Figure 1 This is a structural schematic diagram of the prefabricated composite floor slab structure provided in this embodiment;
[0023] Figure 2 yes Figure 1 Bottom view;
[0024] Figure 3 yes Figure 1 A schematic diagram of the steel mesh structure;
[0025] Figure 4 This is a schematic diagram of the assembly of the prefabricated composite floor slab structure with the first and second shear walls provided in this embodiment;
[0026] Figure 5 This is a schematic diagram of the side structure of the prefabricated composite floor slab structure facing the pre-embedded pipe opening provided in this embodiment;
[0027] Figure 6 This is a schematic diagram of the side structure of the prefabricated composite floor slab structure facing the tongue and groove provided in this embodiment;
[0028] In the diagram: 1-Precast composite slab; 2-Truss reinforcement; 3-Prestressed strand; 4-Prestressed clamp; 5-Longitudinal reinforcement of composite slab; 6-Longitudinal reinforcement of end beam; 7-First tongue and groove joint; 8-End beam; 9-Through hole for reinforcing bars in wall section; 10-Stirrups of end beam; 11-First shear wall; 12-Second tongue and groove joint; 13-Through hole for reinforcing bars in wall section; 14-Transverse reinforcement of composite slab; 15-Sunken support; 16-Reinforced reinforcement zone for through holes for reinforcing bars; 17-Reinforced reinforcement for corner section; 18-Second shear wall; 19-Post-cast section at corner; 20-Composite intermediate slab; 21-Groove layer for end beam; 22-Cement layer for end beam; 23-Embedded pipe; 24-Bottom rib beam reinforcement; 25-Bottom rib beam. Detailed Implementation
[0029] 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
[0030] This embodiment provides a prefabricated composite floor slab structure to solve the problem that some prefabricated composite floor slabs in the prior art have poor bending stiffness and require additional support during assembly and pouring.
[0031] refer to Figures 1 to 6 The prefabricated composite floor slab structure provided in this embodiment includes,
[0032] Precast composite panel 1;
[0033] Embedded pipe 23 is embedded in the precast composite slab body 1;
[0034] The prestressed strand 3 passes through both ends of the embedded pipe 23 and is used to apply arching stress to the precast composite slab body 1. The two ends of the prestressed strand 3 are also equipped with prestressed clamps 4 with adjustable tensile stress.
[0035] The pad 15 is provided on the precast composite slab 1. The pad 15 raises the precast composite slab 1 so as to increase the height of the prestressed clamp 4 to no less than the height of the first shear wall 11.
[0036] During fabrication, the reinforcing mesh of the precast composite slab 1 is laid out, and the embedded pipes 23 are placed in the mesh according to the design. After the initial pouring of the precast composite slab 1, the embedded pipes 23 are fixed within the precast composite slab 1. Before assembly pouring, the precast composite slab 1 is placed on the first shear wall 11 via pads 15, as shown in the reference. Figure 6 The support 15 elevates the precast composite slab 1, ensuring that the height of the pipe opening of the embedded pipe 23 exceeds that of the first shear wall 11. Prestressed strands 3 pass through the embedded pipe 23, with each strand located at one end. Adjustable prestressing clamps 4 are installed at both ends of the prestressed strands 3. During the assembly and pouring of the precast composite floor slab structure, the camber stress applied to the precast composite slab 1 by the prestressed strands 3 is gradually increased by controlling the prestressing clamps 4. This camber stress counteracts the gravity of the concrete during assembly and pouring, thus reducing the need for additional support. Furthermore, the adjustable camber stress gradually increases with the pouring of concrete, counteracting the gravity of the concrete and reducing the strength requirements of the precast composite slab 1. This method is suitable for slabs with insufficient steel mesh density or low concrete strength. Example 2
[0037] This embodiment provides a prefabricated composite floor slab structure. 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.
[0038] refer to Figure 3 and Figure 5The transverse reinforcing bars 14 and longitudinal reinforcing bars 5 of the composite slab interweave to form the reinforcing mesh of the precast composite slab body 1. To allow the arching stress to be better exerted through the precast composite slab body 1, as one embodiment, embedded pipes 23 are arranged parallel to the longitudinal reinforcing bars 5 of the composite slab. The longitudinal reinforcing bars 5 are generally the main reinforcing bars of the precast composite slab body 1, and can cooperate with the prestressed strands 3 to produce a suitable arching effect in the precast composite slab body 1. An embedded pipe 23 is installed at regular intervals of a certain number of longitudinal reinforcing bars 5. For example, in… Figure 5 An embedded pipe 23 is installed between the two longitudinal reinforcing bars 5 of the composite slab.
[0039] As one embodiment, the spacing between adjacent embedded pipes 23 is controlled at around 300mm, which can control the arching effect of the precast composite slab 1 relatively evenly and at a lower cost.
[0040] To facilitate integrated connection between the precast composite floor slab structure and the existing first shear wall 11 during assembly and pouring, the first shear wall 11 has pre-reserved wall section reinforcing bars 13. Corresponding to the positions of the pre-reserved shear wall reinforcing bars 13, through holes 9 are opened in the precast composite slab body 1. When the precast composite floor slab structure is placed on the first shear wall 11, the shear wall reinforcing bars 13 on both sides are inserted into the pre-reserved through holes 9 in the precast composite slab body 1. During the assembly and pouring of the precast composite floor slab structure, the concrete poured on the precast composite slab body 1 flows to contact the shear wall reinforcing bars 13. After the concrete solidifies, the friction and adhesion between the concrete and the shear wall reinforcing bars 13 ensure a stable connection.
[0041] refer to Figure 4 The first shear wall 11 is generally a transverse shear wall. In some precast composite floor slab structures, in addition to connecting to the first shear wall 11 on both sides, a third side will connect to the longitudinal shear wall, i.e., the second shear wall 18. (Reference) Figure 4 In area A, the second shear wall 18 and the first shear wall 11 have a gap, as shown in the reference. Figure 4 In area B, the gap is filled by pouring the corner section 19 after the precast composite floor slab structure is fully assembled and poured. To better integrate the precast composite floor slab structure with the corner section 19, the first shear wall 11 has reinforced wall section reinforcement 13 within a certain distance from the corner. Figure 4 The precast composite slab 1 has a reinforced bar through-hole zone 16, while the precast composite slab body 1 has a reinforced bar through-hole zone 16 matching the reinforced bar 17 of the corner section within a certain range from the corner. When the corner post-cast section 19 is poured, the corner post-cast section 19 is better integrated with the precast composite floor slab structure through the reinforced bar through-hole zone 16.
[0042] In existing precast composite floor slab structures, before assembly and pouring, the upper surface of the precast composite slab 1 is lower than the top height of the first shear wall 11 to form a new concrete layer during assembly and pouring. However, in this embodiment, in order to provide operating space for the prestressed clamp 4 at the pipe opening of the embedded pipe 23, a pad 15 is used to raise the precast composite slab 1. (Refer to...) Figure 5 and Figure 6 This arrangement ensures that not only the upper surface of the precast composite slab 1 exceeds the top height of the first shear wall 11, but also the height of the prestressed clamp 4 at the pipe opening of the embedded pipe 23 exceeds the top height of the first shear wall 11. Concrete is then assembled and poured using temporary formwork. In one embodiment, the pad 15 matches the pre-reserved support notch in the first shear wall 11, and the support width of the pad 15 is not less than 100mm. The wider support width of the pad 15 can offset the impact of its higher support height on stability.
[0043] As one embodiment, reference Figure 1 and Figure 2 The precast composite slab 1 has multiple truss steel bars 2 on the side facing away from the first shear wall 11, and multiple bottom rib beams 25 on the side of the precast composite slab 1 close to the first shear wall 11. As one embodiment, the truss steel bars 2 and the bottom rib beams 25 are arranged in parallel. When the upper surface of the precast composite slab 1 is assembled and poured, in addition to the prestressed strands 3 arching to offset the weight of the concrete during assembly and pouring, the truss steel bars 2 and the bottom rib beams 25 can also strengthen the precast composite slab 1 to withstand the weight of the secondary concrete pouring, thus offsetting the bending effect (downward deflection moment) of the concrete before initial setting on the precast composite slab 1.
[0044] In one embodiment, the bottom rib beam 25 typically measures 50*50mm, with one beam spaced every 1000mm, and two 8mm diameter longitudinal reinforcing bars 24 are provided at its bottom. (Reference) Figure 1 The bottom rib beam 25 is set in the middle of the bottom of the precast composite slab 1 and on both sides, for a total of three beams.
[0045] As one embodiment, the prefabricated composite floor slab structure provided in this embodiment can be reliably spliced with other intermediate slabs 20, as shown in the reference. Figure 5 The joint between the precast composite slab 1 and the composite intermediate slab 20 has a Z-shaped cross-section, which can mitigate grout leakage. The first tongue-and-groove joint 7 of the precast composite slab 1 and the tongue-and-groove joint of the composite intermediate slab 20 interlock to form a Z-shaped joint, increasing the grout seepage path and significantly reducing grout leakage during the construction of the post-cast layer compared to traditional straight joints. Similarly, the second tongue-and-groove joint 12 of the precast composite slab 1 extends into the second shear wall 18, increasing the stability of the structure and reducing grout leakage. The Z-shaped cross-section has two vertical sections, each 30mm long, and a cross section of 20mm.
[0046] In one embodiment, the embedded pipe 23 is made of PVC.
[0047] In one embodiment, end beams 8 can be installed on both sides where the precast composite slab 1 connects to the first shear wall 11, with the lower part of the end beams 8 serving as a base 15. The cross-sectional dimensions of the end beams 8 are typically 100*100mm. A 10mm thick end beam grouting layer 21 and an end beam joint caulking layer 22 are installed between the base 15 and the reserved support opening in the first shear wall 11, and the contact surfaces are roughened accordingly. The end beam grouting layer 21 is made of cement mortar, and the end beam joint caulking layer 22 is filled with cement slurry from the concrete during the assembly and pouring process.
[0048] The end beam 8 is equipped with four longitudinal bars 6. The longitudinal bars 6 are made of grade III steel with a diameter of 8mm. Every 200mm, there is an end beam stirrup 10, which is made of grade I steel with a diameter of 6mm.
[0049] In this embodiment, the tensile stress of multiple prestressed strands 3 forms an arching stress on the precast composite slab 1 at both ends, thereby enabling the precast composite slab 1 to counteract the influence of uncured concrete during assembly and pouring. This is suitable for precast composite slabs 1 with poor structural bending stiffness. If the pre-tensioning method is used, the prestressed strands 3 are tensioned inside the precast composite slab 1 during the initial pouring of concrete. The tensile stress of the prestressed strands 3 may damage the precast composite slab 1, resulting in the prestressed strands 3 being set too low at the factory, which cannot meet the requirement of counteracting the bending effect exerted on the precast composite slab 1 by the concrete poured during the secondary assembly. Therefore, in this embodiment, the prestressed strand 3 is applied using the post-tensioning method to exert arching stress on the precast composite slab 1. Initially, the concrete has minimal impact on the precast composite slab 1 during the initial pouring of the secondary assembly. As the pouring process progresses, the self-weight of the concrete gradually increases, initiating a bending effect on the precast composite slab 1. The tensile stress of the prestressed strand 3 is adjusted by the prestressing clamp 4, ensuring that the arching effect of the prestressed strand 3 on the precast composite slab 1 is offset in real time from the bending effect of the concrete. After the secondary concrete poured above the precast composite slab 1 solidifies and achieves a certain structural strength, the prestressed strand 3 can be removed as needed, or cement can be injected into the embedded pipe 23 to seal the prestressed strand 3 within the embedded pipe 23, allowing it to continue generating an arching effect.
[0050] 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.
[0051] 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."
[0052] 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 prefabricated composite floor slab structure, characterized in that, include, Precast composite slab body (1); Embedded pipe (23) is embedded in the prefabricated composite slab body (1); The prestressed strand (3) passes through both ends of the pre-embedded pipe (23) and is used to apply arching stress to the precast composite slab body (1). The two ends of the prestressed strand (3) are also provided with prestressed clamps (4) with adjustable tensile stress. A pad (15) is provided on the precast composite slab body (1). The pad (15) raises the precast composite slab body (1) so that the height of the prestressed clamp (4) is not lower than the first shear wall (11).
2. The precast composite floor slab structure according to claim 1, characterized in that, The embedded pipe (23) is arranged in parallel with the longitudinal reinforcement (5) of the composite slab, and an embedded pipe (23) is set at intervals of a certain number of longitudinal reinforcement (5) of the composite slab.
3. The precast composite floor slab structure according to claim 1, characterized in that, The precast composite slab (1) has through holes (9) for inserting reinforcing bars at the positions corresponding to the reserved shear wall reinforcing bars (13).
4. The precast composite floor slab structure according to claim 3, characterized in that, The prefabricated composite slab (1) has a reinforcement through hole densification zone (16) that matches the reinforcement reinforcement (17) of the corner section within a certain range from the corner.
5. The precast composite floor slab structure according to claim 1, characterized in that, The pad (15) matches the placement notch reserved in the first shear wall (11), and the placement width of the pad (15) is not less than 100mm.
6. The precast composite floor slab structure according to claim 1, characterized in that, The spacing between adjacent pre-embedded pipes (23) is 300mm.
7. The precast composite floor slab structure according to claim 1, characterized in that, The precast composite slab (1) has multiple truss steel bars (2) on the side away from the first shear wall (11), and multiple bottom rib beams (25) on the side of the precast composite slab (1) close to the first shear wall (11); the truss steel bars (2) are distributed in parallel with the bottom rib beams (25).
8. The precast composite floor slab structure according to claim 1, characterized in that, It also includes a composite middle plate (20) spliced with the prefabricated composite plate body (1); the splice section between the prefabricated composite plate body (1) and the composite middle plate (20) is a Z-shaped section.