Truss-rib-free support-free laminated slab
The trussless, supportless composite slab solves the problems of loose connections and insufficient overall strength during hoisting by using a hanging and stacking mechanism, thereby improving construction safety and building quality, and reducing construction and maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI JINCONNE NEW MATERIAL TECHNOLOGY CO LTD
- Filing Date
- 2025-05-16
- Publication Date
- 2026-04-17
AI Technical Summary
Existing composite slabs are prone to loosening and falling off during hoisting, resulting in weak connections, insufficient overall strength, and misalignment and gaps at the joints, which affects construction safety and building quality.
The design adopts a trussless, supportless composite slab design. The suspension mechanism enhances the stability of the suspension, while the composite mechanism enhances the stability of the splicing and the overall structural resistance to bending and cracking. The structure is formed by the use of stressed steel mesh, supporting steel frame and cast composite layer, and weight-reducing plates are set at the splicing points to reduce the self-weight.
It improves the safety and stability of hoisting and installation, enhances the firmness of splicing and the bending and crack resistance of the overall structure, reduces the self-weight of the structure, and avoids construction hazards and later maintenance costs.
Smart Images
Figure CN224134028U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of composite slab technology, specifically a composite slab without truss reinforcement and without support. Background Technology
[0002] Trussless and supportless composite slabs are suitable for various building scenarios that require high construction efficiency, control of construction costs, and assurance of structural strength and stability. For example, in the construction of floor slabs for multi-story or mid- to high-rise residential buildings, they can significantly shorten the time for on-site support erection and formwork installation, and accelerate the construction progress. In large-scale public buildings such as commercial complexes and office buildings, their standardized production and convenient splicing characteristics can meet the needs of different spans and spatial layouts, and efficiently complete the laying of large-area floor slabs.
[0003] However, the following problems were found in the implementation of the relevant technologies:
[0004] In existing composite slab construction technologies, most suspended structures, due to their simple fixing methods, are easily affected by swaying and impact during hoisting, leading to loose connections, displacement, and even detachment of suspended components. This not only threatens the safety of construction workers but also damages the composite slab, delays construction progress, and increases costs associated with secondary hoisting and material waste. Furthermore, conventional composite slabs often employ truss reinforcement or simple steel bar layouts, resulting in insufficient overall strength. During subsequent building use, under the influence of upper loads, temperature changes, and long-term stress, quality problems such as mid-slab deflection and mid-span cracks are prone to occur, affecting the structural safety and service life of the building. Additionally, the lack of effective reinforcement design at the joints leads to misalignment and gaps between adjacent composite slabs, resulting in poor floor flatness and requiring extensive manual repairs and leveling. Furthermore, weak joints can easily cause leakage hazards during long-term use, increasing building maintenance costs. Utility Model Content
[0005] To address the problems mentioned in the background section, this invention provides a truss-free, support-free composite slab with advantages of stable suspension and structural integrity. The suspension mechanism enhances the firmness and stability of the suspension, facilitating hoisting and installation. Furthermore, the composite mechanism strengthens the joint stability and improves the overall structural resistance to bending and cracking.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a truss-free, support-free composite slab, comprising a precast concrete base slab, wherein a composite mechanism is provided on the inner side of the precast concrete base slab, and a plurality of hanging mechanisms arranged in a rectangular array are fixedly provided on the upper surface of the precast concrete base slab, wherein the hanging mechanism includes a fixing plate, the fixing plate being in contact with the upper surface of the precast concrete base slab, a lifting ring being fixedly provided on the upper surface of the fixing plate, and two symmetrically distributed fixing bolts being inserted into the upper surface of the fixing plate, the fixing bolts being fixedly engaged with the precast concrete base slab.
[0007] Preferably, the composite mechanism includes two reinforcing steel meshes, the outer side of which is fixedly connected to the inner side of the precast concrete base plate, and multiple supporting steel frames distributed at equal intervals are fixedly provided between one end of the two reinforcing steel meshes, and the multiple supporting steel frames and the two reinforcing steel meshes are cast and buried with a cast composite layer.
[0008] Preferably, the upper surface of the fixing plate has two fixing holes, and the inner side of the fixing holes is slidably fitted with the fixing bolts.
[0009] Preferably, a fastening nut is fitted onto the outer thread of the fixing bolt.
[0010] Preferably, an anti-loosening washer is fitted on the outside of the fixing bolt.
[0011] Preferably, the inner side of the precast concrete base slab is provided with a casting groove, and the inner side of the casting groove is in contact with the casting composite layer.
[0012] Preferably, the precast concrete base plate has a roughened surface on the side facing the stacking mechanism.
[0013] Preferably, splicing plates are fixedly provided on both sides of the precast concrete base slab, and a splicing block is fixedly provided on one side of one of the splicing plates, and a splicing groove is provided on one side of the other splicing plate. Adjacent precast concrete base slabs are fitted and spliced together with the splicing block through the splicing groove.
[0014] Preferably, fixed reinforcing bars are fixed on both sides of the cast composite layer, and the fixed reinforcing bars extend above the structural beams of the building structure.
[0015] Preferably, the interior of the cast composite layer is provided with multiple weight-reducing plates.
[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0017] 1. This utility model uses a hanging mechanism to securely connect to a precast concrete base plate via a fixing plate, a lifting ring, and fixing bolts. It is also equipped with a fastening nut and an anti-loosening washer, which enhances the firmness and stability of the hanging and facilitates hoisting and installation.
[0018] 2. The hanging mechanism can be fixed to the precast concrete base plate by means of pre-embedded sleeves, which act as shear keys in the post-cast composite layers to form an overall force transmission.
[0019] 3. This utility model is composed of a composite mechanism consisting of a reinforcing steel mesh, a supporting steel frame, and a cast composite layer. The reinforcing steel mesh and the supporting steel frame form a stable structure, and the cast composite layer further enhances the overall strength. It also has a weight-reducing plate to reduce the self-weight of the structure. The weight-reducing plate is made of prestressed plate to enhance the splicing stability and the bending and crack resistance of the overall structure. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the precast concrete base plate structure of this utility model;
[0022] Figure 3 This is a schematic diagram of the hanging mechanism structure of this utility model;
[0023] Figure 4 This is a schematic cross-sectional view of the stacking mechanism of this utility model;
[0024] Figure 5 This is a schematic diagram of the cast-in-place composite layer structure of this utility model.
[0025] In the diagram: 1. Precast concrete base slab; 2. Hanging mechanism; 3. Overlapping mechanism; 4. Pouring trough; 20. Fixing plate; 21. Lifting ring; 22. Fastening nut; 23. Anti-loosening washer; 24. Fixing bolt; 25. Fixing hole; 30. Supporting steel frame; 31. Reinforcing steel mesh; 32. Pouring composite layer; 33. Weight reduction plate; 34. Splicing plate; 35. Splicing trough; 36. Splicing block; 37. Fixing steel bar. Detailed Implementation
[0026] 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.
[0027] like Figures 1 to 5As shown, this utility model provides a truss-free, support-free composite slab, including a precast concrete base slab 1. A stacking mechanism 3 is provided on the inner side of the precast concrete base slab 1. Multiple hanging mechanisms 2 arranged in a rectangular array are fixedly provided on the upper surface of the precast concrete base slab 1. Each hanging mechanism 2 includes a fixing plate 20, which is attached to the upper surface of the precast concrete base slab 1. A lifting ring 21 is fixedly provided on the upper surface of the fixing plate 20. Two symmetrically distributed fixing bolts 24 are inserted into the upper surface of the fixing plate 20, and the fixing bolts 24 are fixedly engaged with the precast concrete base slab 1. During the production process of the precast concrete base slab 1, the fixing plate 20 is pre-placed at a designated position on the upper surface of the base slab. Then, the two fixing bolts 24 are inserted into fixing holes 25 opened on the upper surface of the fixing plate 20, allowing the fixing bolts 24 to pass through the fixing holes 25 and engage with the pre-embedded fixing structure inside the precast concrete base slab 1. The fixing bolts 24 are initially tightened using tools, thus initially fixing the fixing plate 20 to the precast concrete base slab 1. Next, anti-loosening washers 23 are placed on the outside of the fixing bolts 24, and then the fastening nuts 22 are screwed on and tightened further. The anti-loosening washers 23 prevent the fastening nuts 22 from loosening, thereby firmly connecting the fixing plate 20 to the precast concrete base plate 1. After the composite slab is formed as a whole, when hoisting and installation are required, the hook of the hoisting equipment is attached to the lifting rings 21 on the upper surface of the fixing plate 20, and safe and stable hoisting and installation operations can be carried out.
[0028] Specifically, the composite structure 3 includes two reinforcing steel meshes 31. The outer sides of the reinforcing steel meshes 31 are fixedly connected to the inner side of the precast concrete base slab 1. Multiple equally spaced supporting steel frames 30 are fixedly provided between one end of the two reinforcing steel meshes 31. The multiple supporting steel frames 30 and the outer sides of the two reinforcing steel meshes 31 are covered by a cast composite layer 32. During the production of the precast concrete base slab 1, the outer sides of the two reinforcing steel meshes 31 are first fixedly connected to the inner side of the precast concrete base slab 1 to ensure that the reinforcing steel meshes 31 are accurately positioned and stable. Subsequently, the multiple supporting steel frames 30 are fixed at equal intervals to one end of the two reinforcing steel meshes 31 to form a stable reinforcing steel skeleton structure. At the construction site, the precast concrete base slab 1, equipped with reinforcing steel mesh 31 and supporting steel frame 30, is hoisted to the designated location and assembled. Concrete is then poured into the pouring groove 4 on the inner side of the precast concrete base slab 1 and onto the outer side of the reinforcing steel mesh 31 and supporting steel frame 30, forming a cast composite layer 32. During the pouring process, the roughened surface on the side of the precast concrete base slab 1 facing the composite mechanism 3 enhances the bond between the cast composite layer 32 and the precast concrete base slab 1.
[0029] Meanwhile, splicing plates 34 are fixed on both sides of the precast concrete base slab 1. One splicing plate 34 has a splicing block 36 fixed on one side, and the other splicing plate 34 has a splicing groove 35 on one side. Adjacent precast concrete base slabs 1 are fitted together with the splicing block 36 through the splicing groove 35. When multiple precast concrete base slabs 1 are laid side by side on the structural beam, the splicing groove 35 and the splicing block 36 fit together to prevent grout leakage during the pouring of the composite layer. When splicing adjacent composite slabs, the splicing block 36 on one composite slab splicing plate 34 is inserted into the splicing groove 35 on another composite slab splicing plate 34 to achieve precise splicing of adjacent composite slabs. In addition, multiple weight-reducing plates 33 are set inside the poured composite layer 32. After the concrete curing is completed, the entire composite mechanism 3 can provide reliable support for the building structure. The weight-reducing slab 33 can be a prestressed concrete slab, which uses lightweight concrete to reduce the self-weight of the structure while further strengthening the structure. The weight-reducing slab 33 is poured into the cast composite layer 32 and will not cause arching.
[0030] Furthermore, the fixing hole 25 is opened on the upper surface of the fixing plate 20, and its inner side slides and fits against the fixing bolt 24, so that the fixing bolt 24 can be accurately inserted into the fixing hole 25, providing accurate positioning for the connection between the fixing plate 20 and the precast concrete base plate 1, avoiding the offset of the fixing bolt 24 during the installation process, ensuring the accuracy and stability of the installation of the hanging mechanism 2, and thus ensuring the safety and reliability of the hoisting and installation process.
[0031] Furthermore, a fastening nut 22 is threaded onto the outside of the fixing bolt 24. By tightening the fastening nut 22, the pressure on the fixing plate 20 can be further increased, and the fixing plate 20 can be more tightly fixed to the precast concrete base plate 1.
[0032] It is worth noting that an anti-loosening washer 23 is fitted on the outside of the fixing bolt 24. When the fastening nut 22 is tightened, the anti-loosening washer 23 is compressed and undergoes elastic deformation, which fills the tiny gap between the fastening nut 22 and the fixing plate 20 and increases the friction between the two.
[0033] It is worth noting that a casting groove 4 is opened on the inner side of the precast concrete base slab 1, and the inner side of the casting groove 4 is in contact with the casting composite layer 32. This design provides a dedicated area and good space for the casting of the casting composite layer 32.
[0034] It is worth mentioning that a roughened surface is provided on the inner side of the precast concrete base slab 1, which increases the surface roughness of the precast concrete base slab 1. When the composite layer 32 is poured, the roughened surface can better interlock with the poured concrete, greatly enhancing the adhesion between the poured composite layer 32 and the precast concrete base slab 1.
[0035] It is worth emphasizing that splicing plates 34 are provided on both sides of the cast composite layer 32. One splicing plate 34 has a splicing block 36 on one side, and the other splicing plate 34 has a splicing groove 35 on one side, with the splicing groove 35 fitting snugly against the splicing block 36. This allows for rapid and accurate splicing positioning of adjacent composite plates during splicing through the precise cooperation between the splicing block 36 and the splicing groove 35.
[0036] It is worth emphasizing that fixed reinforcing bars 37 are provided on both sides of the cast composite layer 32, and the fixed reinforcing bars 37 extend above the structural beam of the building structure. The structural beam is preferably a composite beam. This design enhances the connection strength between the composite beam and the cast composite layer 32.
[0037] It is worth emphasizing that multiple weight-reducing plates 33 are set inside the cast composite layer 32. The weight-reducing plates 33 can pre-apply a certain amount of prestress within the cast composite layer 32. This prestress can effectively offset or reduce the tensile stress generated by factors such as upper load and temperature changes during the use of the composite mechanism 3, thereby significantly enhancing the bending and crack resistance of the composite mechanism 3.
[0038] Working principle: During the production of the precast concrete base slab 1, an embedded sleeve is embedded and cast. A fixing plate 20 is pre-placed at a designated position on the upper surface of the base slab. Two fixing bolts 24 are then inserted into the fixing holes 25 (i.e., the openings of the embedded sleeves) on the upper surface of the fixing plate 20, allowing the bolts 24 to pass through the holes 25 and engage with the pre-embedded fixing structure (i.e., the embedded sleeves) inside the precast concrete base slab 1. The fixing bolts 24 are initially tightened using tools, thus initially fixing the fixing plate 20 to the precast concrete base slab 1. Next, anti-loosening washers 23 are placed on the outside of the fixing bolts 24, and then a fastening nut 22 is screwed on and further tightened. The anti-loosening washers 23 prevent the fastening nut 22 from loosening, thereby firmly connecting the fixing plate 20 to the precast concrete base slab 1. After the composite slab is formed, when hoisting and installation are required, the hook of the hoisting equipment is attached to the lifting ring 21 on the upper surface of the fixing plate 20 for safe and stable hoisting and installation operations.
[0039] During the production of the precast concrete base slab 1, the outer sides of two reinforcing steel meshes 31 are first fixedly connected to the inner side of the precast concrete base slab 1 to ensure the accurate and stable positioning of the reinforcing steel meshes 31. Subsequently, multiple supporting steel frames 30 are fixed at equal intervals between one end of the two reinforcing steel meshes 31 to form a stable steel skeleton structure. At the construction site, the precast concrete base slab 1, with its reinforcing steel meshes 31 and supporting steel frames 30, is hoisted to the designated location and assembled. When assembling adjacent composite slabs, the splicing block 36 on one composite slab splicing plate 34 is inserted into the splicing groove 35 on another composite slab splicing plate 34 to achieve precise splicing of adjacent composite slabs. Furthermore, multiple weight-reducing plates 33 are installed inside the cast composite layer 32. Concrete is poured into the casting groove 4 opened on the inner side of the precast concrete base slab 1, and on the outer sides of the reinforcing steel meshes 31 and supporting steel frames 30, forming the cast composite layer 32. During the pouring process, the roughened surface on the inner side of the precast concrete base slab 1 enhances the bond between the poured composite layer 32 and the precast concrete base slab 1. Simultaneously, the composite slab is laid on the composite beam, allowing the overlapping portions of the composite beam and the composite slab to be integrally poured to form the poured composite layer 32.
[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.
[0041] 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 free-joist self-supporting laminated slab, comprising a prefabricated concrete bottom plate (1), characterized in that: The inner side of the precast concrete base plate (1) is provided with a stacking mechanism (3), and the upper surface of the precast concrete base plate (1) is fixed with a plurality of hanging mechanisms (2) arranged in a rectangular array. The hanging mechanism (2) includes a fixing plate (20), which is attached to the upper surface of the precast concrete base plate (1). A lifting ring (21) is fixedly provided on the upper surface of the fixing plate (20), and two symmetrically distributed fixing bolts (24) are inserted into the upper surface of the fixing plate (20). The fixing bolts (24) are fixedly engaged with the precast concrete base plate (1).
2. The self-supporting laminated slab without trussing and bracing according to claim 1, characterized in that: The composite mechanism (3) includes two reinforcing steel meshes (31). The outer side of the reinforcing steel meshes (31) is fixedly connected to the inner side of the precast concrete base plate (1). Multiple supporting steel frames (30) are fixedly arranged at equal intervals between one end of the two reinforcing steel meshes (31). The multiple supporting steel frames (30) and the two reinforcing steel meshes (31) are covered by a cast composite layer (32).
3. The self-supporting laminated slab without trussing and bracing according to claim 1, characterized in that: The upper surface of the fixing plate (20) has two fixing holes (25), and the inner side of the fixing holes (25) slides and fits with the fixing bolts (24).
4. The self-supporting laminated slab without trussing and bracing according to claim 1, characterized in that: The outer thread of the fixing bolt (24) is fitted with a fastening nut (22).
5. The self-supporting laminated slab without trussing and bracing according to claim 1, characterized in that: The outer side of the fixing bolt (24) is fitted with an anti-loosening washer (23).
6. A truss-free, support-free composite slab according to claim 1, characterized in that: The inner side of the precast concrete base plate (1) is provided with a casting groove (4), and the inner side of the casting groove (4) is in contact with the casting composite layer (32).
7. The self-supporting laminated slab without trussing and bracing of claim 1, wherein: The precast concrete base plate (1) has a roughened surface on the side facing the stacking mechanism (3).
8. The self-supporting laminated slab without trussing and bracing of claim 2, wherein: Both sides of the precast concrete base plate (1) are fixedly provided with splicing plates (34), one of the splicing plates (34) is fixedly provided with a splicing block (36) on one side, and the other splicing plate (34) is provided with a splicing groove (35) on one side. The adjacent precast concrete base plates (1) are fitted and spliced together with the splicing block (36) through the splicing groove (35).
9. The self-supporting laminated slab without trussing and bracing of claim 8, wherein: Both sides of the cast composite layer (32) are fixed with reinforcing bars (37), which extend above the structural beams of the building structure.
10. The self-supporting laminated slab without trussing and bracing according to claim 2, characterized in that: The interior of the cast composite layer (32) is provided with multiple weight-reducing plates (33).