Reinforcing structure for different joints of prefabricated composite floor slab
By employing a reinforced structure at the joints of prefabricated composite floor slabs, utilizing the upper and lower horizontal beams and tie rods to form a tensile force, and combining this with water-stop plates to prevent leakage, the problem of difficult quality control at the joints was solved, achieving high-quality construction results and cost savings.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANXI WUJIAN GRP CO LTD
- Filing Date
- 2025-06-03
- Publication Date
- 2026-05-12
AI Technical Summary
Construction quality is difficult to control at the joints of precast composite floor slabs, which can easily lead to defects such as grout leakage, honeycombing, exposed reinforcement, and misalignment, thus affecting the quality of the concrete.
The structure employs reinforcement at different joints of precast composite floor slabs, including precast composite slab layers, cast-in-place concrete layers, composite slab reinforcement, top slab bottom membrane, top slab main and secondary joists, and reinforcement devices. It utilizes upper and lower horizontal beams and tie rods to form a tensile force, combined with water-stop plates to prevent leakage, and can be reused through steel sleeve connections.
It effectively avoids the concrete appearance quality problems caused by traditional processes, saves materials and reduces costs, and improves construction quality.
Smart Images
Figure CN224228010U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of prefabricated building technology, specifically a reinforcement structure for different joints of prefabricated composite floor slabs. Background Technology
[0002] Prefabricated modular construction technology is a new type of construction that involves prefabricating building components in a factory and then transporting them to the construction site for assembly. Compared to traditional construction methods, this technology is not only a revolution in construction methods, but also a key path to address the impacts of resource scarcity, climate crisis, environmental pollution, project delays, and construction quality defects. Its development will continue to reshape the construction industry landscape.
[0003] Precast composite floor slabs (referred to as "composite slabs") are a widely used horizontal load-bearing component in modern prefabricated buildings. Their core idea is to "disassemble" the traditional cast-in-place concrete floor slab into two parts: a precast part and a cast-in-place part, which work together to bear the load.
[0004] Currently, in the actual construction of precast composite floor slabs, the construction procedures at the connection nodes (joints) are numerous, making it difficult to control the construction quality. If there is deformation at the joints, it will seriously affect the concrete quality at the connection between the composite slab and the wall panels, resulting in quality defects such as grout leakage, honeycombing, exposed reinforcement, and misalignment. Therefore, the construction of the joints of precast composite floor slabs is particularly important. Summary of the Invention
[0005] The purpose of this utility model is to solve the problems mentioned in the background art and to provide a reinforcement structure for different joints of prefabricated composite floor slabs.
[0006] This utility model is achieved through the following technology:
[0007] A reinforcement structure for different joints of a precast composite floor slab includes a precast composite slab layer, a cast-in-place concrete layer, composite slab reinforcement bars, a top slab bottom membrane, main and secondary joists of the top slab, and reinforcement devices.
[0008] The precast composite slab layer is installed below the cast-in-place concrete layer, the composite slab reinforcement is installed inside the precast composite slab layer, the top slab bottom membrane is installed below the precast composite slab layer, and the top slab main and secondary joists are installed below the top slab bottom membrane.
[0009] The clamping device includes a steel sleeve, a lower crossbeam component, a fastening nut, and an upper crossbeam component. An upper tie rod is installed on one side of the steel sleeve, and a lower tie rod is installed on the other side of the steel sleeve. The upper tie rod is fixedly connected to the upper crossbeam component, and the lower tie rod passes through the lower crossbeam component and is threadedly connected to the fastening nut. The steel sleeve, the upper tie rod, and the lower tie rod are integrally installed through the precast composite slab layer. The lower crossbeam component abuts against the bottom of the main and secondary keels of the top slab, and the upper crossbeam component abuts against the top of the precast composite slab layer.
[0010] Preferably, the upper crossbeam member and the upper tie rod form an L-shape.
[0011] Preferably, the upper crossbeam member and the upper tie rod form a T-shape.
[0012] Preferably, the upper tie rod is provided with a water-stop plate, which is fixedly installed on the upper tie rod.
[0013] Preferably, the lower end pull rod is provided with a washer, which is fitted onto the lower end pull rod and sandwiched between the lower crossbeam member and the fastening nut.
[0014] Preferably, the prefabricated composite slab layer is provided with a double-sided adhesive strip, one end of which is fixedly installed on the prefabricated composite slab layer, and the other end of which is installed above the bottom film of the top slab.
[0015] This utility model provides a reinforcement structure for different joints of precast composite floor slabs. Through its structural design, corresponding reinforcement devices are used to reinforce the joints of the precast composite slab layers at different locations. The upper and lower crossbeams, connected by upper and lower tie rods, create a counter-tension, ensuring that the ends of the precast composite slab layer are tightly bonded to the top formwork under stress. Simultaneously, the water-stop plate on the upper tie rod acts as a water stopper, preventing water leakage from the upper part of the precast composite slab layer, thus avoiding impacts on appearance and functionality. A steel sleeve connects the lower and upper tie rods, allowing the reinforcement device to be reused.
[0016] Compared with existing technologies, this utility model avoids the concrete appearance quality problems caused by traditional processes by designing a reinforcement device for the joints of precast composite slabs and changing its application process. This avoids quality defects such as grout leakage, honeycombing, exposed reinforcement, and misalignment. At the same time, it saves materials and reduces costs. Attached Figure Description
[0017] Figure 1 This is a floor plan of the prefabricated composite floor slab construction.
[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure at point 1-1 shown in the figure.
[0019] Figure 3 yes Figure 2 The enlarged structural diagram at point A in the figure shows.
[0020] Figure 4 yes Figure 1 The cross-sectional structure diagram shown in Figure 2-2.
[0021] Figure 5 yes Figure 4 The enlarged structural diagram at point A in the figure shows.
[0022] In the diagram: 1. Precast composite slab layer; 2. Cast-in-place concrete layer; 3. Composite slab reinforcement; 4. Top slab bottom membrane; 5. Top slab main and secondary joists; 6. Steel sleeve; 7. Upper tie rod; 8. Lower tie rod; 9. Lower crossbeam component; 10. Fastening nut; 11. Upper crossbeam component; 12. Waterstop plate; 13. Gasket; 14. Double-sided adhesive strip. Detailed Implementation
[0023] 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 protection scope of the present utility model.
[0024] In the description of this utility model, it should be noted that the terms "upper", "lower", "inner", "one side", "the other side", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0025] like Figures 1 to 5 As shown, this embodiment provides a reinforcement structure for different joints of a prefabricated composite floor slab, including a prefabricated composite slab layer 1, a cast-in-place concrete layer 2, composite slab reinforcement 3, a top slab bottom membrane 4, top slab main and secondary joists 5, and a reinforcement device.
[0026] The precast composite slab layer 1 is installed below the cast-in-place concrete layer 2, the composite slab reinforcement 3 is installed inside the precast composite slab layer 1, the top slab bottom membrane 4 is installed below the precast composite slab layer 1, and the top slab main and secondary joists 5 are installed below the top slab bottom membrane 4.
[0027] The clamping device includes a steel sleeve 6, a lower crossbeam component 9, a fastening nut 10, and an upper crossbeam component 11. An upper tie rod 7 is installed on one side of the steel sleeve 6, and a lower tie rod 8 is installed on the other side of the steel sleeve 6. The upper tie rod 7 is fixedly connected to the upper crossbeam component 11, and the lower tie rod 8 passes through the lower crossbeam component 9 and is threadedly connected to the fastening nut 10. The steel sleeve 6, the upper tie rod 7, and the lower tie rod 8 are integrally installed through the precast composite slab layer 1. The lower crossbeam component 9 abuts against the bottom of the main and secondary keels 5 of the top slab, and the upper crossbeam component 11 abuts against the top of the precast composite slab layer 1.
[0028] In this embodiment, when the precast composite slab layer 1 is reinforced at its end and side, the upper crossbeam member 11 and the upper tie rod 7 in the clamping device form an L-shape, as shown below. Figure 3 As shown.
[0029] In this embodiment, when reinforcement is applied at the joint of adjacent precast composite slab layers 1, the upper crossbeam member 11 and the upper tie rod 7 in the clamping device form a T-shape, as shown below. Figure 5 As shown.
[0030] In this embodiment, a water-stop plate 12 is provided on the upper tie rod 7. The water-stop plate 12 is fixedly installed on the upper tie rod 7. The water-stop plate 12 on the upper tie rod 7 plays a role in stopping water leakage and preventing water leakage from the upper part of the precast composite slab layer 1, which would affect the appearance and functionality.
[0031] In this embodiment, a washer 13 is provided on the lower end pull rod 8. The washer 13 is fitted onto the lower end pull rod 8 and sandwiched between the lower crossbeam member 9 and the fastening nut 10. The washer 13 prevents the fastening nut 10 from squeezing and damaging the lower crossbeam member 9.
[0032] In this embodiment, a double-sided adhesive strip 14 is provided on the prefabricated composite slab layer 1. One end of the double-sided adhesive strip 14 is fixedly installed on the prefabricated composite slab layer 1, and the other end of the double-sided adhesive strip 14 is installed above the top plate bottom film 4. The double-sided adhesive strip 14 enhances the connection between the prefabricated composite slab layer 1 and the top plate bottom film 4.
[0033] In the implementation scheme of this embodiment, the reinforcement device consists of an upper crossbeam component 11 (machined from HRB400E25), a waterstop plate 12, a support tie rod (steel sleeve 6 + upper tie rod 7 + lower tie rod 8), a lower crossbeam component 9 (machined from 8# channel steel), a gasket 13, and a fastening nut 10.
[0034] When the reinforcement device is used for the reinforcement of the ends and sides of the precast composite slab layer 1 or for areas where there is a height difference in the floor slab, such as Figure 2 and Figure 3As shown, the upper crossbeam component 11 and the upper tie rod 7 form an L-shape. The upper crossbeam component 11 and the lower crossbeam component 9 are connected by an intermediate tie rod consisting of a steel sleeve 6, an upper tie rod 7, and a lower tie plate 8, which forms an upper and lower tension force. This ensures that the ends and sides of the precast composite slab layer 1 are tightly bonded to the bottom membrane 4 of the top slab under stress. At the same time, the water-stop plate 12 in the middle of the tie rod acts as a water stop to prevent water leakage from the upper part of the precast composite slab layer 1, which would affect the appearance and functionality.
[0035] When the reinforcement device is used to reinforce the joint of adjacent precast composite slab layers 1, such as Figure 4 and Figure 5 As shown, the upper crossbeam component 11 and the upper tie rod 7 form a T-shape. The upper crossbeam component 11 and the lower crossbeam component 9 are connected by an intermediate tie rod consisting of a steel sleeve 6, an upper tie rod 7, and a lower tie plate 8, which forms an upper and lower tension force. This ensures that the two ends of the precast composite slab layer 1 are tightly attached to the bottom mold of the top plate 4 under stress. At the same time, the water-stop plate 12 in the middle of the tie rod plays a water-stopping role, preventing water leakage from the upper part of the precast composite slab layer 1, which would affect the appearance and functionality.
[0036] The entire construction process in this embodiment consists of the following steps:
[0037] The first step is to erect the floor formwork.
[0038] The second step is to tie the steel bars for the walls and columns of the floors.
[0039] The third step is to install the wall formwork, column formwork, and beam bottom formwork.
[0040] The fourth step is to tie and install the beam reinforcement.
[0041] Step 5: Install the beam side formwork and top slab formwork. Attach double-sided adhesive strips 14 to the outer edges of the bottom film 4 of the top slab.
[0042] Step 6: Hoisting of precast composite slab layer 1. Precast composite slab layer 1 contains composite slab reinforcement 3. Hoisting is carried out in strict accordance with the hoisting sequence of the design drawings of precast composite slab layer 1.
[0043] Step 7: Install the main reinforcement devices at different joints of the precast composite slab layer 1. According to the pre-detailed design drawings, reserve reinforcement device positions at different locations, with one reinforcement device every 0.5m. L-shaped reinforcement devices are used for the outer beams and the slabs with height differences, while T-shaped reinforcement devices are used for the joints of the precast composite slab layer 1 in the middle of each span. The installation sequence of the two reinforcement devices is as follows: tie rod installation (upper crossbeam component 11) → lower crossbeam component 9 installation → gasket 13 installation → fastening nut 10 and gasket 13 installation.
[0044] Step 8: Installation of water, electricity, and heating pipes.
[0045] Step 9: Binding the top slab reinforcement.
[0046] Step 10: Concealed inspection.
[0047] Step 10: Pour the second layer of cast-in-place concrete.
[0048] When constructing the above reinforcement devices, the corresponding reinforcement devices should be used to reinforce the joints of the precast composite slab layer 1 in different locations.
[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A reinforcement structure for different joints of a prefabricated composite floor slab, characterized in that: It includes a precast composite slab layer (1), a cast-in-place concrete layer (2), composite slab reinforcement (3), a top slab bottom membrane (4), top slab main and secondary joists (5), and reinforcement devices; The precast composite slab layer (1) is installed below the cast-in-place concrete layer (2), the composite slab reinforcement (3) is installed inside the precast composite slab layer (1), the top slab bottom membrane (4) is installed below the precast composite slab layer (1), and the top slab main and secondary keels (5) are installed below the top slab bottom membrane (4). The reinforcement device includes a steel sleeve (6), a lower crossbeam component (9), a fastening nut (10), and an upper crossbeam component (11). An upper tie rod (7) is installed on one side of the steel sleeve (6), and a lower tie rod (8) is installed on the other side of the steel sleeve (6). The upper tie rod (7) is fixedly connected to the upper crossbeam component (11), and the lower tie rod (8) passes through the lower crossbeam component (9) and is threadedly connected to the fastening nut (10). The steel sleeve (6), the upper tie rod (7), and the lower tie rod (8) are installed as a whole through the precast composite slab layer (1). The lower crossbeam component (9) abuts against the bottom of the main and secondary keels (5) of the top slab, and the upper crossbeam component (11) abuts against the top of the precast composite slab layer (1).
2. The reinforcement structure at different joints of the prefabricated composite floor slab according to claim 1, characterized in that: The upper crossbeam member (11) and the upper tie rod (7) form an L-shape.
3. The reinforcement structure at different joints of the prefabricated composite floor slab according to claim 1, characterized in that: The upper crossbeam member (11) and the upper tie rod (7) form a T-shape.
4. The reinforcement structure at different joints of the prefabricated composite floor slab according to claim 2 or 3, characterized in that: The upper tie rod (7) is provided with a water-stop plate (12), which is fixedly installed on the upper tie rod (7).
5. The reinforcement structure at different joints of the prefabricated composite floor slab according to claim 2 or 3, characterized in that: The lower end pull rod (8) is provided with a washer (13), which is fitted onto the lower end pull rod (8) and sandwiched between the lower crossbeam member (9) and the fastening nut (10).
6. The reinforcement structure at different joints of the prefabricated composite floor slab according to any one of claims 1-3, characterized in that: The prefabricated composite slab layer (1) is provided with a double-sided adhesive strip (14). One end of the double-sided adhesive strip (14) is fixedly installed on the prefabricated composite slab layer (1), and the other end of the double-sided adhesive strip (14) is installed above the bottom film (4) of the top plate.