Cast-in-place prefabricated building floor component

Abstract

The utility model discloses a cast-in-place prefabricated building floor slab component which comprises a floor slab body and a plurality of rod-shaped connecting parts protruding from the inner side face of the floor slab body, and the end of the floor slab component is provided with a connecting matching part matched with the adjacent floor slab component. The floor slab is characterized in that the floor slab body is a steel plate, reinforcing steel bars are arranged on the connecting parts and are parallel to the floor slab body, and a pouring cavity is formed between the reinforcing steel bars and the floor slab body. According to the cast-in-place prefabricated building floor slab component, the effect of restraining the cast-in concrete of the cast-in-place prefabricated building floor slab component can be better achieved, and particularly the restraining area of the cast-in-place prefabricated building floor slab component is increased

Description

[0001] This application claims priority to Chinese utility model patent application filed on April 9, 2024, with application number 202420722848.4 and entitled "A Cast-in-place Precast Building Floor Slab Component". Technical Field

[0002] This utility model belongs to the field of construction, specifically relating to a building floor slab component, particularly a cast-in-place precast building floor slab component. Background Technology

[0003] In reinforced concrete building structures, especially frame beam-column structures, longitudinal steel bars and transverse steel bars spaced along the longitudinal direction are usually provided to form a steel cage. The transverse steel bars bear the structural shear force on the one hand, and restrain the longitudinal steel bars and concrete on the other hand, so as to improve the structural bearing capacity and seismic performance.

[0004] In building construction, formwork is the primary material for shaping the structure. Traditional construction methods involve first erecting scaffolding, positioning and tying reinforcing bars, then using sheet metal to construct the structural formwork, followed by concrete pouring, and finally removing the formwork after the concrete has solidified. In traditional construction, formwork needs to be erected on-site, and horizontal and vertical reinforcing bars are connected by tying or welding to form a reinforcing cage before pouring concrete. After the building is completed, the formwork is removed. When there are many and dense reinforcing bars at the joints of building components, on-site processing of the reinforcing cage, whether by tying or welding, is not only inefficient but also results in numerous instances of repeated bending of the reinforcing bars on-site, leading to inconsistent spacing and reduced load-bearing capacity.

[0005] In the currently popular prefabricated construction, building components and accessories (such as floor slabs, beams, wall panels, stairs, balconies, etc.) are prefabricated in factories, then transported to the construction site, and assembled into a complete building on-site using traditional connection methods (such as welding or sleeve grouting connections). Construction sites typically no longer require additional formwork. However, because these prefabricated components are pre-cast reinforced concrete structures, especially load-bearing components such as columns, beams, walls, and floor slabs, their overall weight and volume are relatively large if they are also prefabricated in factories. On-site construction requires specialized and expensive installation equipment, and the installation process is extremely inconvenient and poses significant safety hazards. Hoisting operations are almost always high-altitude work, and there are considerable risks during component transportation, secondary transfer, and hoisting. For example, whether the embedded lifting points of the components are securely installed, and whether the lifting claws and wire ropes can withstand the weight of the components are all important safety hazards in prefabricated construction. In addition, if all prefabricated components meet cast-in-place concrete, the construction joints that exist at the interface often result in problems such as cold joints, cracking, and leakage due to insufficient bonding between dry and wet concrete, coupled with the load disturbance from equipment and operators during the pouring process. The strength, sealing, and stability of these joints are all questionable.

[0006] Furthermore, in existing technologies, reinforcing bars are prefabricated by processing steel bars into the required shapes and then welding them, or they are tied on-site to form interlocking reinforcing cages. These cages are then molded together with cast-in-place concrete using on-site formwork to form the building structure. Alternatively, they are prefabricated reinforced concrete building components and then assembled on-site to form the entire building. On-site tying of reinforcing bars is time-consuming and labor-intensive, requires manual operation which leads to a lack of standardization, and results in highly unstable connections. In contrast, the reinforcing bars used in prefabricated buildings are formed within prefabricated reinforced concrete building components, resulting in a larger overall weight and volume. On-site construction requires specialized and expensive installation equipment, and the installation process is extremely inconvenient and poses significant safety hazards.

[0007] For prefabricated floor slab components in prefabricated buildings, composite floor slabs are currently the most commonly used. This involves prefabricating upper and lower reinforcing bars on a cast-in-place base slab, and then pouring composite layer concrete on the construction site to form a whole with the floor slab.

[0008] For example, Chinese patent application CN 220353196U discloses a prefabricated floor slab structure, including a floor slab body. One side of the floor slab body has a first connecting part that protrudes horizontally outward, and the other side of the floor slab body has a second connecting part that protrudes horizontally outward. The first connecting part and the second connecting part are arranged sequentially along the thickness direction of the floor slab body. The bottom end of the first connecting part is integrally cast with a first reinforcing bar. The top end of the second connecting part is provided with a first groove that is adapted to the diameter of the first reinforcing bar and engages with it. The top end of the second connecting part is integrally cast with a second reinforcing bar. The top end of the first connecting part is provided with a second groove that is adapted to the diameter of the second reinforcing bar.

[0009] The disclosed floor slab assembly process is as follows: The floor slab body is erected on a steel beam. When splicing multiple floor slabs, firstly, one side of the floor slab body with the second connecting part is placed on the steel beam. Then, the side of another floor slab body with the first connecting part is placed on the same steel beam, with the first connecting part positioned above the second connecting part. The bottom end of the first reinforcing bar enters the first groove, and the bottom end of the second reinforcing bar enters the second groove. Then, the splice joint formed between the two floor slab bodies is poured. The placement of the first reinforcing bar, the second reinforcing bar, the first groove, and the second groove positions the two floor slab bodies and strengthens the connection between them. To enhance the strength of the floor slab body, a third reinforcing bar is provided within the floor slab body. The third reinforcing bar is arranged horizontally and perpendicular to the first and second reinforcing bars.

[0010] This technology can address the issues of robustness and standardization in composite floor slab splicing to some extent. However, the floor slabs used in this technology are all made of concrete formwork, requiring crisscrossing upper and lower reinforcing cages and perpendicular reinforcing bars for load-bearing support. This means that both the concrete formwork and the upper and lower reinforcing bars must function independently as building components. The prefabrication process for concrete floor slabs is time-consuming and labor-intensive, hindering large-scale, standardized production. Furthermore, the constraint effect on the concrete, especially in the constrained area, is solely provided by the upper and lower reinforcing bars and the reinforcing bars. The concrete floor slab merely provides a supporting structure for the building components and does not substantially improve the constraint effect and constrained area of ​​the reinforcing cage on the cast-in-place concrete. Whether it's precast components used in prefabricated buildings or the on-site cast-in-place precast floor slabs provided by this patented technology, the constraint effect and constrained area of ​​the reinforcing bars and precast concrete floor slabs on the cast-in-place concrete are also limited. They cannot truly withstand the longitudinal pressure and lateral expansion stress of the cast-in-place concrete. When the building's load-bearing capacity exceeds a certain limit, such as in high-rise buildings or during earthquakes, damage is easily caused. The strength of buildings constructed in these ways is at great risk.

[0011] Chinese patent application CN 219491436U discloses a prefabricated floor slab, comprising a base layer composed of multiple precast concrete composite slabs and a cast-in-place layer poured on top of the base layer. The precast concrete composite slab includes a rectangular base plate, a lower layer of reinforcing mesh within the base plate, several load-bearing ribs arranged parallel and spaced apart on the base plate, and an upper layer of reinforcing mesh on all the load-bearing ribs. The load-bearing ribs extend along the length of the base plate until their two end faces are flush with the corresponding sides of the base plate. All the load-bearing ribs divide the base plate into multiple casting zones. The casting zones of two adjacent precast concrete composite slabs are joined to form a joint zone, within which a reinforcing cage is installed. The cast-in-place layer is poured within the casting zone and the joint zone and is flush with the upper surface of the load-bearing ribs. By setting up upper and lower layers of reinforcing mesh, load-bearing ribs, and a reinforcing cage, the overall structural strength, fracture resistance, and load-bearing capacity of the prefabricated floor slab are greatly improved, making the prefabricated floor slab less prone to breakage during construction and eliminating the need for temporary supports during on-site construction.

[0012] This technology still belongs to the category of composite floor slab splicing technology. The floor slab substrate used in this technology is still a concrete formwork, which requires crisscrossing upper and lower layers of steel mesh and corresponding steel cages for load-bearing support. That is, the concrete formwork, the upper and lower layers of steel mesh, and the steel cage in the pouring area all need to function independently as building components. The prefabrication process of concrete floor slabs is time-consuming and labor-intensive, and its steel mesh structure is more complex, which is not conducive to large-scale and standardized production. Moreover, in this technology, the constraint effect on the concrete, especially in the constraint area, is only achieved by the individual steel bars. The concrete floor slab only provides a supporting carrier for the building components and cannot substantially improve the constraint effect and constraint area of ​​the steel cage on the cast-in-place concrete. Whether it is the precast cast-in-place components used in prefabricated buildings or the on-site post-cast precast floor slabs provided by this patented technology, the constraint effect and constraint area of ​​the steel bars and precast concrete floor slabs on the cast-in-place concrete are also limited. They cannot truly withstand the longitudinal pressure and lateral expansion stress of the cast-in-place concrete. When the building's load-bearing capacity exceeds a certain limit, such as in high-rise buildings or in the event of an earthquake, it is easy to cause damage. The strength of buildings constructed in these ways is at great risk. Summary of the Invention

[0013] To address the problems existing in the prior art, and taking CN 220353196U as the closest prior art, this utility model provides a cast-in-place precast building floor slab component. This utility model provides the following specific technical solutions:

[0014] A cast-in-place precast building floor slab component includes a floor slab body and a plurality of rod-shaped connecting parts protruding from the inner side of the floor slab body. The ends of the floor slab components are provided with connecting mating parts that cooperate with adjacent floor slab components. The floor slab body is characterized by being a steel plate, with reinforcing bars on the connecting parts, the reinforcing bars being parallel to the floor slab body and forming a casting cavity between them. The novel cast-in-place precast building floor slab component obtained through this basic technical solution utilizes a steel plate as the floor slab body, which, in conjunction with a horizontally formed reinforcing steel mesh on one side (inner side), forms a structural unit. This achieves the dual functions of construction formwork and structural reinforcing steel in traditional construction processes. During building construction, additional formwork and reinforcing steel binding are no longer required, especially eliminating the need for lower, lower-layer (or outer) reinforcing steel meshes, and eliminating the need for reinforcing steel meshes on both sides and casting on both sides to form a composite slab. This saves on production costs and reduces difficulties in processing and construction. More importantly, by using steel plates as the floor slab body and cooperating with the horizontally formed reinforcing steel mesh on one side to replace traditional formwork and steel reinforcement structures, the novel cast-in-place precast building floor slab component of this utility model can, to a certain extent, provide stronger restraint on the cast-in-place concrete, especially increasing the restraint range on the concrete, thereby improving the overall shear bearing capacity and seismic performance of the building.

[0015] Preferably, the steel plate of this invention is formed by fixing together multiple segments of steel plate separated in the width direction. In this further preferred embodiment, during the factory prefabrication process, the separated segments of steel plate can be further processed to form the overall structure of the floor slab body in the form of the steel plate required in the final prefabricated component. This measure not only saves materials but also facilitates the standardization, generalization, and large-scale production of the product.

[0016] Preferably, the fixed connection of multiple steel plates in this invention is formed by spot welding. In this further preferred technical solution, compared with directly connecting multiple steel plates as a whole, connecting the steel plates by spot welding can not only satisfy the integrity of the prefabricated building components, but also further separate the stress of each steel plate, ensuring the uniformity of the bending stiffness of the components in all directions, and also facilitating standardized and large-scale production on factory assembly lines.

[0017] Preferably, the outer surface of the steel plate of this invention is further provided with a reinforcing layer, which is a magnesium phosphate-based material layer. In this further preferred embodiment, by adding a reinforcing layer, particularly a magnesium phosphate-based cementitious material layer, to the outer surface of the building floor slab component of this invention, the reinforcing layer provides better bonding and support to the steel plate, thereby enhancing the steel plate's resistance to the outward transverse stress generated by the cast-in-place concrete, further strengthening the constraint effect on the cast-in-place concrete, and particularly reducing the area of ​​the unconstrained zone. Of course, in addition to using a magnesium phosphate-based material layer as the reinforcing layer, other forms such as laying steel mesh and concrete can also be used as the reinforcing layer, as long as the constraint effect can be enhanced through better bonding with the steel plate structural floor slab.

[0018] Preferably, the outer side of the steel plate of this invention is recessed inward to form a groove, and a protrusion corresponding to the groove is formed in the casting cavity. One end of the connecting part passes through the groove via the outer side of the steel plate, and this end has an upset anchor head, which is located in the groove and fits against it to serve as an outer side connecting fastener. The connecting part has an external thread at the part where it intersects with the inner side of the steel plate, and a nut fits against the inner side of the steel plate to serve as an inner side connecting fastener. In this further preferred technical solution, the interlocking concave-convex structure allows the connecting part to fit tightly against the steel plate floor slab body, achieving the function of traditional reinforcing bars, and its restraining effect is significantly better than that of traditional reinforcing bars, which can greatly increase the restraint range of the internal concrete. Moreover, this design allows the outer end of the connecting part to be located in the internal space of the steel plate floor slab body without protruding to the outside of the steel plate, which will not affect the appearance of the outer surface of the building component, and can also avoid the obstacles caused by adding other functional layers to the outer side of the steel plate. At the same time, it is more ideal for production, packaging and transportation during the factory prefabrication process.

[0019] Preferably, the upset anchor head of this invention includes an anchor head body with a diameter larger than that of the connecting portion, which protrudes outward to form a fitting portion that can fit with the groove; or the anchor head body fits with the groove through a washer disposed on the connecting portion, the diameter of the washer being larger than that of the anchor head body. In this further preferred embodiment, the fitting portion on the upset anchor head or the added washer further enhances the rigid constraint range of the anchor head, while allowing the connecting portion to fit more tightly with the steel plate floor slab body, thus achieving the function of traditional reinforcing bars, and its constraint effect is significantly better than that of traditional reinforcing bars. The tight fit allows the connecting portion and the steel plate floor slab body to better form an integral cohesive force distribution, which helps to better resist the stress of the poured concrete, and can greatly increase the constraint range and constraint effect on the internal concrete.

[0020] Preferably, the angle formed between the sidewall and bottom of the groove in this invention is 30-60°; the diameter of the protrusion is 2-5 times the diameter of the rod-shaped member. In this further preferred embodiment, the groove structure is designed to be larger on the outside and smaller on the inside, with a size larger than the diameter of the connecting part. This allows the connecting part to pass smoothly through one side of the steel plate floor slab body while fitting snugly against the outer side, enabling a tighter fit with the steel plate floor slab body to function as traditional reinforcing steel. Its effect is significantly better than traditional reinforcing steel, helping to better resist the stress of the poured concrete and greatly increasing the restraint range of the internal concrete.

[0021] Preferably, the outer side of the steel plate of this invention is recessed inward to form a groove, and a protrusion corresponding to the groove is formed in the casting cavity. One end of the connecting part passes through the groove via the outer side of the steel plate. The portion where the connecting part intersects with the inner and outer sides of the steel plate is provided with external threads. Nuts are used to fit the inner and outer sides of the steel plate respectively, serving as connecting fasteners for the inner and outer sides. In this further preferred embodiment, considering the difficulty of the upset anchor head processing technology, using threaded connections on both the inner and outer sides as connecting fasteners can reduce processing difficulty, reduce processing costs, increase product qualification rate, and facilitate its large-scale production.

[0022] Preferably, the connecting part of this utility model has an L-shaped structure, with its bottom horizontal section directly fitted and fixed to the inner side of the steel plate as a connecting fastener, and its vertical section connected to the reinforcing bar. In this further preferred technical solution, considering the difficulty and cost of the upset anchor head processing technology and the groove process, a direct fixing method is used, eliminating the need for simultaneous connection and fixing of the groove and the inner and outer sides. This further reduces processing difficulty, reduces processing costs, increases product qualification rate, and facilitates its large-scale production.

[0023] Preferably, the connecting mating part at one end of the floor slab component can fit tightly with the corresponding connecting mating part of the adjacent floor slab component, allowing the two floor slab components to be assembled with their outer surfaces flush. In this further preferred embodiment, the connecting mating part eliminates the need for prefabricating bulky complete components as in traditional prefabricated buildings. Simultaneously, multiple floor slab components can be easily assembled into the required complete floor slab on-site. The connecting mating part can be processed into a standard interface, which greatly improves efficiency for large-scale prefabrication of standard components in factories, reduces the technical requirements for installation workers, and provides a good foundation for the application of intelligent construction technology.

[0024] Preferably, the connecting and mating part of this utility model is a slot mating or a plug-in mating form. In this further preferred embodiment, the assembly of multiple floor slab components can use any known suitable mating form. Slot mating or plug-in mating is the most convenient method for on-site construction and is also ideal for factory processing. However, other suitable mating forms can also be used as long as they serve the purpose of connection and mating.

[0025] Preferably, the reinforcing bars described in this invention are a reinforcing mesh formed by multiple intersecting reinforcing bars. In this further preferred embodiment, the reinforcing bars in the form of a reinforcing mesh provide restraint on the cast-in-place concrete at different locations and in different directions within the steel slab floor body, helping to better resist the stress and structural shear force of the cast-in-place concrete and greatly increasing the restraint range on the internal concrete. The quantity and spacing of the various connecting parts and the longitudinal and transverse reinforcing bars can be appropriately set according to different building locations and building types, and those skilled in the art can optimize the selection based on specific construction requirements.

[0026] Beneficial effects

[0027] In summary, compared with the prior art, this utility model has the following beneficial effects:

[0028] This utility model discloses a novel cast-in-place precast building floor slab component. A steel plate serves as the floor slab body, working in conjunction with a horizontally formed reinforcing mesh on one side to create a combined force, simultaneously functioning as formwork and reinforcement. This eliminates the need for formwork and rebar tying during construction, saving production costs and reducing the difficulty of processing and construction. Using a steel plate as the floor slab body, in conjunction with a horizontally formed reinforcing mesh on one side, instead of traditional formwork and rebar structures, provides better constraint on the cast-in-place concrete, particularly increasing the constrained area, thereby improving the overall shear resistance and load-bearing capacity of the building.

[0029] In this novel cast-in-place precast building floor slab component, the distance between the component and the internal reinforcing steel and concrete can be increased by controlling the thickness of the steel slab body. The multi-layered internal restraint components, such as a horizontal steel mesh on one side, combined with the steel slab body structure (including groove and protrusion designs, and anchor heads and other connecting fasteners), greatly increase the restraint range and effect on the internal concrete. The better bonding effect of the outer reinforcing layer on the steel slab body structure enhances the steel slab's resistance to lateral stress in the internal concrete. The integral steel slab formed by segmented welding significantly reduces the unevenness of the pressure exerted on the steel slab by the building structure at different locations. The above structural features of this novel cast-in-place precast building floor slab component better restrain the poured concrete, especially increasing the restraint area.

[0030] This utility model discloses a novel cast-in-place precast building floor slab component. It uses a steel plate as the floor slab body, which, in conjunction with a horizontally formed reinforcing steel mesh on one side, forms a building structure that simultaneously functions as formwork and reinforcement. The connection points utilize a special connection and fixing structure, facilitating the prefabrication of this novel cast-in-place precast building floor slab component. Neither the prefabrication process nor the on-site construction process requires binding or welding; it can be directly prefabricated in the factory according to standardized specifications in batches. This improves efficiency, avoids inconsistencies in construction processes, and shortens the construction cycle and reduces construction requirements.

[0031] This invention relates to a novel cast-in-place precast building floor slab component. A steel plate serves as the floor slab body, working in conjunction with a horizontally formed reinforcing mesh on one side to create a building structure that simultaneously functions as formwork and stirrups. This eliminates the need for separate construction formwork (whether traditional wooden or precast concrete), and also avoids the need for the reinforcing mesh and its pouring on the other side of traditional composite floor slabs. After the cast-in-place concrete has solidified, this novel cast-in-place precast building floor slab component does not need to be removed and can directly function as part of the reinforced concrete building structure, bearing stress along with the reinforcing mesh, thus increasing the confinement area and the confinement effect on the concrete.

[0032] This invention relates to a novel cast-in-place precast building floor slab component. This component can be prefabricated into standard units, which are then assembled at both ends to form a complete floor slab component of the required dimensions. Compared to prefabricated building components, this novel cast-in-place precast building floor slab component is lighter, making transportation, hoisting, and installation more convenient. Furthermore, since concrete is poured in place after installation, it avoids the shortcomings in strength, sealing, and stability of precast prefabricated building components. It also facilitates large-scale factory production, convenient on-site installation, and integrated decoration and finishing, eliminating the need for plastering, puttying, and painting. The miniaturization, lightweighting, standardization, and integration of the building components facilitate the application of artificial intelligence technology, resulting in reduced construction costs, shorter construction periods, and improved quality. Brief description of the attached figures

[0033] Figure 1 This diagram shows a precast column and floor slab component for cast-in-place construction according to Embodiment 1 of this utility model.

[0034] Figure 2 This is a partially enlarged view of the upset anchor head structure of this utility model.

[0035] Explanation of reference numerals in the attached drawings: 1 is steel plate; 2 is connecting part; 3 is reinforcing bar; 4 is reinforcing layer; 5 is groove; 6 is protrusion; 7 is upset anchor head; 8 is anchor head body; 9 is nut; 10 is fitting part; 11 is washer. Detailed Implementation

[0036] The following detailed description provides further details through specific embodiments. However, it should be noted that the embodiments described below are merely for better illustrating the content of this utility model, and do not represent that the content of this utility model is limited to the described embodiments. Therefore, non-essential improvements and adjustments made to the implementation schemes by those skilled in the art based on the above-described invention still fall within the protection scope of this utility model, and the protection scope of the appended claims shall prevail.

[0037] The term "architecture" as used in this utility model refers to all buildings and structures, encompassing artificial environments created by people to meet the needs of social life, utilizing available material and technological means and applying certain scientific principles, Feng Shui concepts, and aesthetic rules. The term "building" has both a broad and a narrow meaning. In a broad sense, it refers to all man-made structures, including both houses and buildings; in a narrow sense, it refers specifically to houses, excluding buildings. A house is a space with a foundation, walls, roof, doors, and windows, providing shelter from wind and rain, and serving as a place for people to live, work, study, entertain, store goods, or engage in other activities. In this utility model, "building" refers to the narrow meaning of "building." Unless otherwise specified in this utility model, "architecture" and "building" are interchangeable terms with the same meaning.

[0038] The term "building component" as used in this utility model refers to the load-bearing components of a building, including foundations (components directly in contact with the ground), walls, columns, beams, floor slabs, roof trusses, etc. Based on the composition of load-bearing components, buildings can be classified as follows: 1) Brick-timber structure buildings: The main load-bearing components of these buildings are made of brick and wood, with longitudinal load-bearing components such as walls and columns made of brick, and horizontal load-bearing components such as floor slabs and roof trusses made of wood. 2) Brick-concrete structure buildings: The vertical load-bearing components of these buildings are brick walls or brick columns, and the horizontal load-bearing components are reinforced concrete floor slabs, roof slabs, etc. 3) Reinforced concrete structure buildings: The load-bearing components of these buildings, such as beams, slabs, columns, walls, and roof trusses, are composed of steel reinforcement and concrete, while their enclosing components, such as walls and partitions, are made of lightweight bricks or other masonry. Types of reinforced concrete structure buildings include frame structures, frame-shear wall structures, shear wall structures, simple structures, frame-tube structures, and tube-in-tube structures. 4) Steel structure buildings: The main load-bearing components of these buildings are made of steel, resulting in high construction costs and making them a non-mainstream form of building. Unless otherwise specified in this utility model, the buildings referred to in this utility model are reinforced concrete structure buildings.

[0039] In building components, walls and columns are both longitudinal load-bearing members, supporting the roof, floors, etc., and transferring these loads and their own weight to the foundation. Walls include the exterior walls surrounding the building, which serve as the building's enclosure, providing wind and rain protection, insulation, heat insulation, and sound insulation; and the interior walls located within the building, primarily serving to divide the interior space, and also providing some sound insulation and fire protection. Based on their load-bearing capacity, walls are divided into load-bearing walls and non-load-bearing walls. Load-bearing walls are those that directly bear the loads transmitted from beams, floors, and roofs; non-load-bearing walls are those that do not bear external loads. Columns are upright supporting members in a building, bearing and transmitting the loads from beams and slabs.

[0040] A floor slab is a horizontal load-bearing component that separates the upper and lower floors of a building. Its main function is to bear the loads of people, furniture, etc., and transfer these loads and its own weight to load-bearing walls, beams, columns, or foundations. In addition to bearing and transmitting vertical and horizontal loads, floor slabs should also have certain sound insulation, waterproofing, and fireproofing capabilities. Various horizontal equipment pipelines in the building will also be installed within the floor slab. The basic structure of a floor slab consists of a surface layer, a structural layer, and a ceiling. Depending on the materials used, floor slabs can be divided into various forms, such as wooden floor slabs, brick arch floor slabs, reinforced concrete floor slabs, and steel-lined load-bearing floor slabs. Currently, reinforced concrete floor slabs are the most commonly used, including precast slabs and cast-in-place slabs. The most popular composite floor slab is constructed by precast upper reinforcing bars supported on a cast-in-place base slab, with bottom reinforcing bars pre-embedded in the base slab, and then pouring the composite layer concrete on-site to form a unified whole with the floor slab.

[0041] According to construction methods, buildings can be classified into the following types: 1) Cast-in-place and masonry buildings: The main load-bearing components of these buildings are cast and masonry on the construction site; 2) Precast and assembled buildings: The main load-bearing components of these buildings are precast components made in a processing plant and assembled on the construction site; 3) Partially cast-in-place and partially assembled buildings: Some components (such as walls) of these buildings are cast or masonry on the construction site, while other components (such as floor slabs and stairs) are precast components made in a processing plant. Unlike the above classifications, the building of this utility model can be defined as a "cast-in-place precast" building, meaning that the main load-bearing components are all precast components made in a processing plant, but this does not include cast concrete and internal longitudinal reinforcement, which are cast and installed on the construction site.

[0042] Reinforced concrete buildings are the most common building structures at present. Reinforced concrete is often abbreviated as "reinforced concrete" in engineering, which refers to a composite material that improves the mechanical properties of concrete by the combined action of materials formed by adding steel mesh, steel plates or fibers to the concrete. Concrete (abbreviated as "concrete") refers to the general term for engineering composite materials in which the aggregate is cemented into a whole by a cementitious material. The term "concrete" in the context of building engineering usually refers to cement concrete, which is made by using cement as the cementitious material, sand and stone as the aggregate, and mixing them with water, other admixtures and additives in a certain proportion and then stirred. In the present utility model, the terms "concrete" and "reinforced concrete" have the same meaning and can be used interchangeably.

[0043] In reinforced concrete buildings, steel bars (longitudinal steel bars and stirrups), formwork and concrete are the main components. Longitudinal steel bars are the steel bars arranged parallel to the longitudinal axis of the building component, and they serve as the main support and load-bearing object of the concrete in the longitudinal direction. Traditional steel bars are generally made by processing round steel bars into the required shapes through processes such as welding. Stirrups are steel bars perpendicular to the longitudinal steel bars and provide transverse shear resistance to the building component.

[0044] Building construction formwork is generally a temporary support structure, which is made according to the design requirements to form reinforced concrete components into the specified position and geometric dimensions, keep their correct positions, and bear the self-weight of the construction formwork and the external loads acting on it. According to the nature of the materials, it can include wooden formwork, concrete formwork, steel formwork, aluminum formwork, etc.

[0045] The present utility model is different from the prior art which requires two structures, namely formwork and steel bars on both sides. Instead, the same structure plays the roles of both at the same time, and both are involved in the substantial restraint of the concrete at the same time.

[0046] The steel plate of the present utility model has a thickness of 0.8 - 10 mm, more preferably 1 - 1.5 mm, and its length in the longitudinal direction is 40 - 1000 mm, more preferably 100 - 300 mm.

[0047] Example 1

[0048] A cast-in-place precast building floor slab component, as Figure 1-2 shown, is made of a steel plate 1 with a thickness of 1.5 mm to form the floor slab body. The length of the steel plate 1 in the longitudinal direction is 200 mm. On one side of the floor slab body (defined as the inner side), a plurality of rod-shaped connecting parts 2 protrude. One end of the connecting part 2 is vertically and fixedly connected to the floor slab body, and a steel bar 3 is provided at the other end. The steel bar 3 is parallel to the floor slab body and a pouring cavity is formed between them. The floor slab component is provided with a pouring hole (not shown) through which concrete can be poured from the outside into the pouring cavity. The steel bar 3 of the present utility model adopts bidirectional steel bars, including transverse load-bearing bars and longitudinal load-bearing bars arranged vertically and horizontally, which is convenient for the transfer and dispersion of forces and improves the bearing capacity of floor slabs with larger sizes.

[0049] In this embodiment, the cast-in-place precast building floor slab components are prefabricated in a factory, and then concrete is poured into the casting cavity at the construction site to form a reinforced concrete floor slab structure.

[0050] In this embodiment, the steel plate 1 and the connecting part 2 are fixed by a special connection method. The outer side of the steel plate 1 is recessed inward to form a groove 5, and a protrusion 6 corresponding to the groove 5 is formed in the casting cavity. One end of the connecting part 2 passes through the groove 5 via the outer side of the steel plate 1. This end has an upset anchor head 7, which is located in the groove 5 and fits against it to form an outer side connection and fixing member. The connecting part 2 has an external thread at the part that intersects with the inner side of the steel plate 1, and a nut 9 fits against the inner side of the steel plate 1 to form an inner side connection and fixing member.

[0051] like Figure 2 As shown, when using the upset anchor head 7, the upset anchor head 7 includes an anchor head body 8 with a diameter larger than that of the connecting part 2; the anchor head body 8 includes a ring of fitting parts 10 formed by protrusions, and achieves a tight fit with the groove 5 through the fitting parts 10. The internal shape of the groove 5 is conical or frustum-shaped, and the angle formed by the groove wall and the groove bottom is about 45°. When the groove 5 and the protrusion 6 are stamped as a single piece, the shape of the protrusion 6 corresponding to the groove 5 is consistent with that of the groove 5, and its inner diameter can be 2-3 times the diameter of the connecting part 2 passing through it. When the fitting part 10 and the anchor head body 8 are not integrally processed, a washer 11 can be used instead of the fitting part 10. In this way, in the processing of the upset anchor head body 8, it is only necessary to ensure that the size of the upset anchor head 7 is larger than that of its corresponding connecting part 2, and it is not necessary to process the fitting part 10 on the upset anchor head body 8. Instead, a washer 11 of matching size is used separately and fitted onto the connecting part 2, and then the washer 11 is tightly fitted with the groove 5. Preferably, the end of the connecting part 2 on the outer side of the steel plate 1 of the floor slab body is located inside the groove 5, and does not extend to the outer side of the steel plate 1. This design can ensure the flatness of the surface of the floor slab body, making it convenient to continue to set the reinforcing layer 4 and other functional or decorative layers on the outer side. In addition, in terms of stress, it can also make the steel plate, which serves as a formwork, closer to the poured concrete, which helps to better and more effectively restrain the internal concrete.

[0052] Considering the complexity of the upset anchor head manufacturing process, a different method could be to use threaded connections on both the inner and outer sides as the fastening components. This would reduce manufacturing difficulty, lower costs, increase product yield, and facilitate large-scale production.

[0053] The reinforcing layer 4 used in this embodiment is a magnesium phosphate-based polymer material layer. Using this material better strengthens the bond between this layer structure and the steel plate 1 of the floor slab component, helping to further effectively restrain the internal concrete. The reinforcing layer 4, connected to the outer surface of the steel plate 1, effectively protects the outer surface of the floor slab component. Furthermore, after the cast-in-place reinforced concrete floor slab is formed, the reinforcing layer 4 can fit tightly against the steel plate 1, assisting in the lateral pressure of the concrete borne by the steel plate 1 and helping to better restrain the internal concrete. Outside the reinforcing layer 4, a concrete layer, decorative layer, thermal insulation layer, sound insulation layer, fireproof layer, wallpaper, or other finishing decorations or pre-installed decorative elements, such as wire troughs, lighting fixture installation ports, or other embedded parts, can still be added as needed. This eliminates the need for any subsequent decoration after the floor slab is installed, further improving the prefabrication level of the building.

[0054] In this invention, the reinforcing layer 4 can also be formed from any material known in the prior art that has good adhesion to steel plates, such as a steel mesh layer plus a concrete layer. The steel mesh layer is fixedly connected to the anchor head body 8 by spot welding, and the steel mesh layer is pressed and fixed by the anchor head body 8.

[0055] In this embodiment, each end of the floor slab component is provided with a corresponding connecting and mating part. One end is provided with an insertion interface extending outward along its longitudinal direction, and the inner side surface of the side wall of the other end along the longitudinal direction is shaped to match the insertion interface as a socket end. The insertion interface and the socket end of another floor slab component can fit tightly together so that the outer surfaces of the floor slab components after insertion are flush with each other. Of course, other mating structures known in the art, such as slot-type mating connections, can also be used, as long as multiple floor slab components can be tightly fitted together and their outer surfaces can be flush with each other.

[0056] During on-site installation, the insertion ends of the floor slab components are inserted into the corresponding sockets of another floor slab component of the same model. If necessary, a third floor slab component can be inserted into the first, until the dimensions meet the requirements of the building's floor slab structure. Once the required dimensions are achieved, the floor slab components used at both ends of the assembled floor slab structure are in a form without connecting joints.

[0057] Example 2

[0058] The difference between the cast-in-place precast building floor slab component and Example 1 is that the connecting part 2 adopts an L-shaped structure. Its bottom horizontal section is directly attached and fixed to the inner side of the steel plate 1 as a connecting fastener, and its vertical section is connected to the reinforcing bar 3. That is, a direct fixing method is used, eliminating the need for simultaneous connection and fixing of the groove 5 and the inner and outer sides. This can further reduce processing difficulty, reduce processing costs, increase product qualification rate, and facilitate its large-scale production.

[0059] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the filing date, are aware of all existing technologies in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in combination with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A cast-in-place precast building floor slab component, comprising a floor slab body and a plurality of rod-shaped connecting portions (2) protruding from the inner side of the floor slab body, wherein the ends of the floor slab component are provided with connecting mating portions that mate with adjacent floor slab components; characterized in that: The floor slab body is a steel plate (1), and a reinforcing bar (3) is provided on the connecting part (2). The reinforcing bar (3) is parallel to the floor slab body and forms a casting cavity between the two.

2. The cast-in-place precast building floor slab component according to claim 1, characterized in that, The steel plate (1) is formed by fixing multiple steel plates that are separated in the width direction of the steel plate (1).

3. The cast-in-place precast building floor slab component according to claim 2, characterized in that, The fixed connection is formed by spot welding.

4. The cast-in-place precast building floor slab component according to any one of claims 1-3, characterized in that, The outer surface of the steel plate (1) is also provided with a reinforcing layer (4), which is a magnesium phosphate-based material layer.

5. The cast-in-place precast building floor slab component according to any one of claims 1-3, characterized in that, The outer side of the steel plate (1) is recessed inward to form a groove (5), and a protrusion (6) corresponding to the groove (5) is formed in the casting cavity. One end of the connecting part (2) passes through the groove (5) via the outer side of the steel plate (1). This end has an upset anchor head (7) that is located in the groove (5) and fits with it to form an outer side connection fastener. The connecting part (2) has an external thread at the part that intersects with the inner side of the steel plate (1). It fits with the inner side of the steel plate (1) through a nut (9) to form an inner side connection fastener.

6. The cast-in-place precast building floor slab component according to claim 5, characterized in that, The upset anchor head (7) includes an anchor head body (8) with a diameter larger than that of the connecting part, which protrudes outward to form a fitting part (10), the fitting part (10) being able to fit with the groove (5); or the anchor head body (8) fits with the groove (5) through a washer (11) provided on the connecting part (2), the diameter of the washer (11) being larger than that of the anchor head body (8).

7. The cast-in-place precast building floor slab component according to claim 6, characterized in that, The angle between the sidewall and the bottom of the groove (5) is 30-60°; the diameter of the protrusion (6) is 2-5 times the diameter of the connecting part (2).

8. The cast-in-place precast building floor slab component according to any one of claims 1-3, characterized in that, The outer side of the steel plate (1) is recessed inward to form a groove (5), and a protrusion (6) corresponding to the groove (5) is formed in the casting cavity. One end of the connecting part (2) passes through the groove (5) via the outer side of the steel plate (1). The part where the connecting part intersects with the inner and outer sides of the steel plate is provided with external threads. Nuts (9) are used to fit the inner and outer sides of the steel plate to form connecting fasteners for the inner and outer sides.

9. The cast-in-place precast building floor slab component according to any one of claims 1-3, characterized in that, The connecting part (2) is an L-shaped structure. Its bottom horizontal section is directly attached to the inner side of the steel plate (1) as a connecting fastener, and its vertical section is connected to the reinforcing bar (3).

10. The cast-in-place precast building floor slab component according to any one of claims 1-3, characterized in that, The connecting part at one end of the floor slab component can fit tightly with the corresponding connecting part of the adjacent floor slab component, so that the two floor slab components can be joined together and their outer surfaces are flush with each other.

11. The cast-in-place precast building floor slab component according to claim 10, characterized in that, The connecting and mating parts are in the form of a slot mating or a plug-in mating.

12. The cast-in-place precast building floor slab component according to any one of claims 1-3, characterized in that, The steel bar (3) is a steel mesh formed by multiple intersecting steel bars.

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