Cast-in-situ cavity floor structure

Abstract

This utility model discloses a cast-in-place hollow cavity floor slab structure, comprising: vertical load-bearing components; node reinforcement blocks; main beams; a lower structural mesh layer; precast hollow cavity core molds; and structural slabs. The node reinforcement blocks are disposed on top of the vertical load-bearing components; the main beams are connected between the node reinforcement blocks; the lower structural mesh layer is connected to the main beams; the precast hollow cavity core molds are arranged on the lower structural mesh layer; the structural slabs are connected to the main beams and the lower structural mesh layer; the main beams, the lower structural mesh layer, and the structural slabs form a load-bearing grid, and the precast hollow cavity core molds are placed and confined within the units of the load-bearing grid. The technical solution provided in this application can completely replace the traditional thick solid floor slab process, and has advantages such as short construction period, low construction cost, minimal environmental impact, good safety performance, good seismic performance, and significantly shortened construction period.

Description

Technical Field

[0001] This utility model relates to the field of building construction technology, specifically to a cast-in-place hollow floor slab structure. Background Technology

[0002] As architectural designs continue to innovate and buildings become increasingly taller, engineers face numerous challenges, such as the heat of hydration of large-volume cast-in-place concrete, the stability of the load-bearing system, space utilization, sound insulation, thermal insulation performance, construction schedule issues, quality upon delivery, and cost optimization.

[0003] Cast-in-place hollow concrete floor slabs can solve the aforementioned problems. The technology, particularly the use of PVC core molds, is showing a diversified development trend, effectively addressing the long-standing limitations of building structures in achieving beam-free flooring, large open spaces, and flexible partitioning. However, achieving lightweight concrete slabs with strong seismic performance, and ensuring the PVC core molds are lightweight, waterproof, soundproof, and highly stable, while also enabling automated industrial production, efficient storage and handling, and simple assembly and installation, remain key challenges hindering the widespread adoption and development of cast-in-place hollow concrete floor slabs. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a cast-in-place hollow floor slab structure, which aims to overcome at least one related technical problem existing in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: This utility model provides a cast-in-place hollow floor slab structure, comprising: a vertical load-bearing component; node reinforcement blocks, a main beam, a lower structural mesh layer, a precast hollow core mold, and a structural slab. The node reinforcement blocks are disposed on the top of the vertical load-bearing component; the main beam is connected between the node reinforcement blocks; the lower structural mesh layer is connected to the main beam; the precast hollow core molds are arranged on the lower structural mesh layer; the structural slab is connected to the main beam and the lower structural mesh layer; the main beam, the lower structural mesh layer, and the structural slab form a load-bearing grid, and the precast hollow core mold is placed and confined within the unit of the load-bearing grid.

[0006] The cast-in-place hollow floor slab structure provided in this application constructs a floor slab structure system with clear stress distribution, clear force transmission path, and effective fixation of precast hollow core molds. It innovatively sets up a load-bearing grid composed of main beams, lower structural mesh layer and structural slab, and places and confines the precast hollow core molds within the units of this grid.

[0007] To achieve excellent durability, water resistance, and shape stability while ensuring the core mold is lightweight, easy to prefabricate, and easy to install, in one possible embodiment, the prefabricated hollow core mold body is made of plastic-steel. Plastic-steel combines the lightweight and corrosion-resistant properties of plastic with the rigidity of steel, making it one of the ideal materials for achieving the objectives of this invention.

[0008] In order to enhance the compressive strength of the core mold itself during construction, in one possible implementation, the top of the plastic steel core mold is an arched structure.

[0009] To provide sufficiently stable vertical support, in one possible implementation, the vertical load-bearing member is a structural column.

[0010] To address the key technical issues of stress concentration and weak punching shear bearing capacity in the main beam intersection area, in one possible implementation, the node reinforcement block is a column cap installed at the top of the structural column.

[0011] In one possible implementation, a concealed beam is provided within the structural slab, and the concealed beam is connected to the lower structural mesh layer. The concealed beam is hidden within the structural slab, its height is the same as the slab thickness, and it uses densely reinforced steel bars. It is connected to the lower structural mesh layer (bottom reinforcement of the slab) to form a whole, jointly contributing to the formation of the aforementioned "load-bearing grid".

[0012] In order to provide greater stiffness and load-bearing capacity in areas with large spans or high loads, in one possible implementation, the hidden beam is a reinforced hidden beam.

[0013] In one possible implementation, the top of the concealed beam is further connected to an upper structural mesh layer; the precast hollow core mold is disposed between the lower and upper structural mesh layers and is separated by the structural slab. The upper and lower structural mesh layers are typically steel mesh sheets.

[0014] In one possible implementation, the vertical load-bearing components are prefabricated in a factory. The node reinforcement blocks are also prefabricated in a factory. To maximize component quality, shorten construction time, and improve industrialization, vertical load-bearing components (such as structural columns) and node reinforcement blocks (such as column caps) are set as prefabricated components. Factory production can effectively control component dimensions and concrete strength, reduce on-site wet work, and align with the direction of building industrialization.

[0015] The beneficial effects that a cast-in-place hollow floor slab structure disclosed in this application may bring include, but are not limited to: This utility model uses a "load-bearing grid" system to position and constrain the cavity core mold, and combines column caps to strengthen nodes, hidden beams to enhance stiffness, and upper and lower steel meshes to cooperate in bearing the load. It successfully realizes a cast-in-place cavity floor system with reasonable structure, light weight, high stiffness, convenient construction, and high comprehensive benefits. It has significant technological progress and wide application value. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a cast-in-place hollow floor slab structure according to an embodiment of this application.

[0017] Figure 2 for Figure 1 Sectional view of AA.

[0018] Figure 3 This is a schematic diagram of the lower and upper structural mesh layers.

[0019] Illustration: 1-Main beam, 2-Column cap, 3-Precast hollow core mold, 4-Structural column, 5-Structural slab, 6-Hidden beam, 7-Upper structural mesh layer, 8-Lower structural mesh layer. Detailed Implementation

[0020] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, an indirect connection through an intermediate medium, or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] like Figure 1-3 As shown, a cast-in-place hollow floor slab structure includes: vertical load-bearing components; node reinforcement blocks; main beams 1; lower structural mesh layer 8; precast hollow core molds 3; and structural slabs 5. The node reinforcement blocks are disposed on the top of the vertical load-bearing components; the main beams 1 are connected between the node reinforcement blocks; the lower structural mesh layer 8 is connected to the main beams 1; the precast hollow core molds 3 are arranged on the lower structural mesh layer 8; the structural slabs 5 are connected to the main beams 1 and the lower structural mesh layer 8; the main beams 1, the lower structural mesh layer 8, and the structural slabs 5 form a load-bearing grid, and the precast hollow core molds 3 are placed and confined within the units of the load-bearing grid.

[0023] The cast-in-place hollow floor slab structure provided in this application constructs a floor slab structure system with clear stress distribution, clear force transmission path and effective fixation of precast hollow core mold 3. It innovatively sets up a load-bearing grid composed of main beam 1, lower structural mesh layer 8 and structural plate 5, and places and confines the precast hollow core mold 3 within the unit of the grid.

[0024] To achieve excellent durability, water resistance, and shape stability while ensuring the core mold is lightweight, easy to prefabricate and install, in one possible embodiment, the prefabricated cavity core mold 3 is specifically a plastic-steel core mold. Plastic-steel combines the lightweight and corrosion-resistant properties of plastic with the rigidity of steel, making it one of the ideal materials for achieving the objectives of this invention.

[0025] To enhance the compressive strength of the mandrel itself during construction, in one possible implementation, the top of the plastic-steel mandrel is constructed as an arched structure. The arched top faces upwards, directly bearing the weight of the concrete above and the construction load, thus optimizing the stress state of the concrete layer above. The arched structure effectively converts vertical loads into compressive stress along the arch shell and distributes it to the surrounding concrete, thereby reducing local stress concentration and lowering the risk of the thin concrete layer being crushed.

[0026] Of course, the top can also use equivalent structures such as polygonal domes or wave shapes to improve compressive strength.

[0027] To provide sufficiently stable vertical support, in one possible implementation, the vertical load-bearing member is a structural column 4. The structural column 4 is the most common and reliable form of vertical load-bearing in building structures. The construction technology is mature, workers are highly skilled, and construction efficiency is improved.

[0028] To address the key technical issues of stress concentration and weak punching shear resistance in the intersection area of ​​the main beam 1, in one possible implementation, the joint reinforcement block is a column cap 2 installed at the top of the structural column 4. The column cap 2 serves as the transition area connecting the floor slab and the structural column 4, typically consisting of a locally thickened and reinforced concrete block. The column cap 2 significantly increases the load-bearing area of ​​the joint, effectively improving the shear and punching shear resistance of the joint and ensuring the safe transfer of floor loads to the structural column 4.

[0029] In one possible implementation, a hidden beam 6 is provided within the structural slab 5, and the hidden beam 6 is connected to the lower structural mesh layer 8. The hidden beam 6 is concealed within the structural slab 5, and its height is the same as the slab thickness. The hidden beam 6 uses densely reinforced steel bars. It is connected to the lower structural mesh layer 8 (bottom reinforcement of the slab) to form a whole, jointly contributing to the formation of the aforementioned "load-bearing mesh".

[0030] To further refine and strengthen the load-bearing grid without sacrificing interior ceiling height, thereby improving the overall stiffness and spanning capacity of the floor slab, and to more effectively separate and limit the precast hollow core mold 3 within the unit, concealed beams 6 are installed within the structural slab 5. The concealed beams 6 work in conjunction with the main beams 1 to form a denser, hidden beam grid system.

[0031] It should be noted that the arrangement of the hidden beam 6 can adopt orthogonal or oblique grids according to the core mold size and stress requirements.

[0032] To provide greater stiffness and load-bearing capacity in areas with large spans or high loads, in one possible implementation, the hidden beam 6 is a reinforced hidden beam 6. Setting the hidden beam 6 as a reinforced hidden beam 6 can be achieved by increasing reinforcement, increasing the cross-sectional width, etc., making it a stronger secondary load-bearing member in the floor slab.

[0033] In one possible implementation, the top of the concealed beam 6 is further connected to an upper structural mesh layer 7; the precast hollow core mold 3 is disposed between the lower structural mesh layer 8 and the upper structural mesh layer 7, and is separated by the structural plate 5. The upper structural mesh layer 7 and the lower structural mesh layer 8 are typically steel mesh sheets.

[0034] After the lower structural mesh layer 8 (bottom reinforcement of the slab) is laid, the hidden beam 6 is tied, the core mold is placed, and then the upper structural mesh layer 7 (top reinforcement of the slab) is tied. The core mold is firmly constrained between the two layers of steel mesh. After the concrete is poured, the structural slab 5 completely encloses the core mold, and the cavity formed by the core mold is separated by the material of the structural slab 5.

[0035] To ensure that the hollow floor slab has sufficient load-bearing capacity when subjected to both positive bending moments (relying on the lower structural mesh layer 8) and negative bending moments (relying on the upper structural mesh layer 7), and to firmly fix the precast hollow core mold 3 vertically, the upper structural mesh layer 7 is installed, placing the core mold between the lower structural mesh layer 8 and the upper structural mesh layer 7. This construction forms a complete stress system and ensures construction accuracy.

[0036] In one possible implementation, the vertical load-bearing components are prefabricated in a factory. The node reinforcement blocks are also prefabricated in a factory. To maximize component quality, shorten the construction period, and improve industrialization, the vertical load-bearing components (such as structural column 4) and node reinforcement blocks (such as column cap 2) are set as prefabricated in a factory. Factory production can effectively control component dimensions and concrete strength, reduce on-site wet work, and align with the direction of building industrialization.

[0037] The following details this application in conjunction with the construction methods: The plastic steel core mold, structural column 4, and column cap 2 are processed in the factory. After processing, they are transported to the site and constructed in the following order: first structural column 4, then main beam 1, then hidden beam 6, and finally fixing the plastic steel core mold.

[0038] During the main structure construction, after precise measurement and positioning of structural columns 4 and main beam 1, structural columns 4 and column caps 2 are installed and poured together with main beam 1. Then, the necessary supports and formwork for the floor slab construction are laid out, and the floor slab system construction begins. Before the floor slab system construction, measurements are taken to mark the positions of main beam 1, hidden beam 6, and each PVC core mold. The lower structural mesh layer 8 is constructed first in the floor slab, followed by the binding of hidden beam 6. During binding, space must be reserved for the PVC core mold. After completion, the PVC core mold is placed on the lower structural mesh layer 8, with the hidden beam 6 providing lateral support to prevent loosening. Finally, the upper structural mesh layer 7 above the PVC core mold is completed. After the entire structure is completed, a final inspection is conducted, and finally, concrete is poured using a concrete placing boom to ensure concrete density.

[0039] This application is mainly used for the construction of high-rise main structures; the structure has better overall performance and seismic performance than precast assembled floor slabs; at the same time, due to its increased void ratio, it has many advantages over ordinary concrete flat slabs, such as lighter self-weight, smaller floor deformation, stronger spanning capacity, and greater cross-sectional stiffness.

[0040] In residential and other ordinary civil buildings, developers and users can personalize the design and layout of rooms according to their own needs without having to consider structural changes, thus avoiding the structural hazards caused by decoration and exterior wall construction in traditional building structures. Compared with ordinary cast-in-place ribbed floor slabs, this hollow structure with concealed ribbed beams can increase the net floor space of the house and has the advantages of saving formwork and simplifying construction. At the same time, due to its universal construction technology, compared with ordinary unbonded prestressed solid flat floor slabs, its structure has many advantages such as simplified construction operations, material saving, reduced cost, and shorter construction period.

[0041] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A cast-in-place hollow cavity floor structure, characterized in that, include: Vertical load-bearing components; Node reinforcement blocks are installed at the top of vertical load-bearing components; Main beam (1), the main beam (1) connected between the node strengthening blocks; The lower structural mesh layer (8) is connected to the main beam (1); Prefabricated hollow core mold (3), the prefabricated hollow core mold (3) is arranged on the lower structural mesh layer (8); The structural plate (5) is connected to the main beam (1) and the lower structural mesh layer (8); The main beam (1), the lower structural mesh layer (8), and the structural plate (5) form a load-bearing grid, and the prefabricated cavity core mold (3) is placed and confined within the unit of the load-bearing grid.

2. The cast-in-place hollow floor slab structure according to claim 1, characterized in that, The prefabricated cavity core mold (3) specifically adopts a plastic steel core mold.

3. The cast-in-place hollow floor slab structure according to claim 2, characterized in that, The top of the plastic-steel core mold has an arched structure.

4. The cast-in-place hollow floor slab structure according to claim 1, characterized in that, The vertical load-bearing component is a structural column (4).

5. The cast-in-place hollow floor slab structure according to claim 4, characterized in that, The node reinforcement block is a column cap (2) set on the top of the structural column (4).

6. The cast-in-place hollow floor slab structure according to claim 1, characterized in that, The structural plate (5) is provided with a hidden beam (6), which is connected to the lower structural mesh layer (8).

7. The cast-in-place hollow floor slab structure according to claim 6, characterized in that, The hidden beam (6) is a reinforced hidden beam (6).

8. The cast-in-place hollow floor slab structure according to claim 6, characterized in that, The top of the hidden beam (6) is also connected to the upper structural mesh layer (7); the prefabricated cavity core mold (3) is set between the lower structural mesh layer (8) and the upper structural mesh layer (7) and is separated by the structural plate (5).

9. The cast-in-place hollow floor slab structure according to claim 1, characterized in that, The vertical load-bearing components are prefabricated in the factory.

10. The cast-in-place hollow floor slab structure according to claim 1, characterized in that, The node reinforcement block is a factory prefabricated component.

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