Multifunctional cavity floor support plate and construction method

Abstract

A multifunctional hollow floor deck and its construction method are disclosed. The hollow floor deck includes a floor deck body, a lower layer of floor deck disposed below the floor deck body, and multiple vibration isolation installation components disposed between the floor deck body and the lower layer of floor deck. Each vibration isolation installation component includes a load-bearing keel fixedly connected to the floor deck body. The load-bearing keel includes a keel body and two extensions respectively disposed on opposite sides of the keel body. Two limiting members are respectively disposed corresponding to the two extensions and are connected to the lower layer of floor deck. Each limiting member has a receiving portion, and the two extensions respectively extend at least partially into the corresponding receiving portion. A vibration isolator is disposed in the receiving portion and sandwiched between the inner walls of the extensions and the receiving portion to separate the load-bearing keel from the limiting members. The multiple vibration isolation installation components extend along the length direction of the floor deck body and are spaced apart. Two adjacent vibration isolation installation components, the floor deck body, and the lower layer of floor deck enclose a cavity.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building floor slabs and building vibration isolation technology, specifically to a multifunctional hollow floor deck and its construction method. Background Technology

[0002] With the development of prefabricated buildings, green buildings, and building industrialization technologies, prefabricated floor decking components such as steel truss floor decking and profiled steel sheet floor decking have been widely used in residential, office, and public buildings. Floor decking can serve as both construction formwork and floor slab components, featuring fast construction speed, less on-site wet work, and a high degree of standardization. To meet the needs of interior decoration, sound insulation, pipeline layout, and HVAC equipment installation, gypsum board, cement fiberboard, or other lower-layer materials are usually installed under the floor decking in projects, and installed using keels, hangers, or connectors. The space between the floor decking and the lower-layer materials is used to lay ventilation ducts, water supply and drainage pipes, and electrical wiring.

[0003] In existing technologies, the lower layer panels are usually rigidly fixed to the floor decking by hangers, metal keels and connectors, forming a continuous rigid vibration transmission path between the floor decking, connecting components and the lower layer panels. When the floor decking is impacted by footsteps, falling objects or other impacts, the resulting vibrations are easily transmitted to the lower layer panels through the connecting components, and noise is radiated from the lower layer panels into the room, forming a structural sound bridge that is difficult to block. It is impossible to simultaneously achieve both installation stability and impact sound isolation.

[0004] Furthermore, the ceiling space beneath existing floor decking is typically a continuous, interconnected space. Ventilation ducts, water supply and drainage pipes, and electrical wiring require separate auxiliary components such as ducts, cable trays, and hangers. This not only results in a large number of components and complex installation procedures but also occupies a significant portion of the building's floor height. The existing connection structure itself also struggles to create multiple cavities extending along the floor decking while simultaneously installing the lower slab, failing to fully utilize the space between the floor decking and the lower slab to integrate vibration isolation, ventilation, pipeline layout, and decorative functions. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a multifunctional cavity floor deck and construction method to overcome the shortcomings of the existing technology, so as to overcome the limitations of the existing floor deck and the lower layer of the board being rigidly connected, which easily forms a sound bridge and the space between the two is difficult to directly form a usable cavity, resulting in insufficient vibration and sound insulation effect, low space utilization and low functional integration.

[0006] The purpose of this invention is to address the deficiencies and shortcomings of existing technologies. On one hand, this application provides a multifunctional hollow cavity floor deck, comprising a floor deck body, a lower layer of material disposed below the floor deck body, and multiple vibration isolation mounting components disposed between the floor deck body and the lower layer of material. The vibration isolation mounting components include: A load-bearing keel is fixedly connected to the floor deck body. The load-bearing keel includes a keel body and two extensions respectively provided on opposite sides of the keel body. Two limiting members are respectively provided corresponding to the two extensions. The limiting members are connected to the lower plate. Each limiting member has a receiving portion, and the two extensions at least partially extend into their respective receiving portions. A vibration isolator is disposed within the receiving portion and sandwiched between the extension portion and the inner wall of the receiving portion, so as to separate the bearing keel from the limiting member; Multiple vibration isolation mounting components extend along the length of the floor deck body and are spaced apart. Two adjacent vibration isolation mounting components, the floor deck body and the lower plate form a cavity.

[0007] On the other hand, this application also provides a construction method for a multifunctional hollow floor decking, applied to the multifunctional hollow floor decking described above, the method comprising: S1. Provide a floor deck body, the floor deck body includes a fine stone concrete base plate and a steel truss set above the fine stone concrete base plate, and extend multiple load-bearing keels along the length direction of the floor deck body and fix them at intervals along the width direction of the floor deck body to the lower surface of the fine stone concrete base plate. S2. Limiting members are provided on both sides of each of the bearing keels, and the extensions on both sides of the bearing keel are respectively inserted into the receiving parts of the corresponding limiting members at least partially, and the vibration isolator is clamped between the extension and the inner wall of the receiving part, so that the bearing keel is separated from the limiting members. S3. Connect the lower plate to multiple limiting members, so that two adjacent load-bearing keels and corresponding limiting members, the floor deck body and the lower plate form a cavity to obtain a prefabricated floor deck unit, wherein the fasteners connecting the lower plate and the limiting members are spaced apart from the vibration isolator and the load-bearing keel. S4. Hoist the precast floor deck unit to the preset installation position and splice adjacent precast floor deck units; S5. A cast-in-place concrete layer is poured on top of the precast floor deck unit, so that the precast floor deck unit and the cast-in-place concrete layer form an integral whole.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. The load-bearing keel is fixed to the floor decking body, and the limiting component is connected to the lower floor decking. The extension of the load-bearing keel extends into the receiving part of the corresponding limiting component. The vibration isolator is sandwiched between the inner wall of the extension and the receiving part, so that the load-bearing keel and the limiting component are separated from each other. The vibration generated by the floor decking body needs to pass through the load-bearing keel, the vibration isolator and the limiting component in sequence before it can be transmitted to the lower floor decking. The vibration isolator can weaken the vibration transmission and avoid the load-bearing keel and the limiting component forming a rigid transmission path directly.

[0009] 2. The two extensions extend into the receiving parts of the two limiting parts respectively. The extensions and receiving parts form a mutually cooperating connection relationship, and the force is transmitted through the vibration isolator sandwiched between them, so that the lower plate can be installed under the floor deck body through the limiting parts. While keeping the load-bearing keel and the limiting parts separated from each other, the connection stability of the vibration isolation installation components is improved.

[0010] 3. Multiple vibration isolation mounting components extend along the length of the floor decking body and are spaced apart, so that two adjacent vibration isolation mounting components, the floor decking body and the lower plate together enclose a cavity. The vibration isolation mounting components not only connect the floor decking body and the lower plate, but also form the side boundary of the cavity. There is no need to set up a separate cavity partition structure, which reduces the number of components and simplifies the installation process, improving the space utilization and functional integration between the floor decking body and the lower plate. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a partial cross-sectional structural diagram of the multifunctional cavity floor deck in an embodiment of the present invention; Figure 2 This is a cross-sectional structural schematic diagram of the vibration isolation mounting assembly in an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the vibration isolation body in an embodiment of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure when the two limiting members are arranged opposite each other in an embodiment of the present invention; Figure 5 This is a top view of the two limiting members being arranged relative to each other in an embodiment of the present invention; Figure 6 This is a side view of the limiting member in an embodiment of the present invention; Figure 7 This is a schematic diagram of the cross-sectional structure of the keel in an embodiment of the present invention; Figure 8 This is a top view of the keel in an embodiment of the present invention; Figure 9 This is a side view of the keel in an embodiment of the present invention; Figure 10 This is a schematic plan view of the installation area of ​​the multifunctional cavity floor deck in an embodiment of the present invention; Figure 11 This is a schematic diagram of the planar arrangement of the multifunctional hollow floor deck between two secondary beams in an embodiment of the present invention; Figure 12 This is a schematic diagram of the cross-sectional arrangement of the multifunctional hollow floor deck between two secondary beams in an embodiment of the present invention; Figure 13 This is a schematic diagram of the functional partitioning of multiple cavities in an embodiment of the present invention; Figure 14 This is a comparison chart of standardized impact sound pressure levels at different frequencies for different floor slab structures in this embodiment of the invention; Figure 15 This is a three-dimensional structural diagram of the multifunctional cavity floor deck in an embodiment of the present invention; Figure 16 This is a flowchart of the construction method for the multifunctional hollow floor deck of the present invention.

[0013] Figure label: 100. Multifunctional hollow floor decking; 200. Floor decking body; 210. Fine aggregate concrete base slab; 220. Steel truss; 300. Lower layer board; 400. Vibration isolation mounting components; 410. Load-bearing keel; 411. Keel body; 412. Connecting plate; 413. Support plate; 414. Extension; 420. Limiting component; 421. Side plate; 422. Limiting plate; 423. Receiving part; 430. Vibration isolator; 431. Vibration isolation part; 432. Limiting groove; 433. Limiting protrusion; 434. Limiting protrusion; 435. Deformation gap; 500. Cavity; 510. Airflow cavity; 511. Supply air cavity; 512. Return air cavity; 513. Air outlet; 520. Pipeline cavity; 600. Fasteners; 700, secondary beam; 800. Cast-in-place concrete layer. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings.

[0015] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive element, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0017] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0018] Reference Figure 1 and Figure 12 This invention provides a multifunctional hollow floor deck 100, including a floor deck body 200, a lower layer 300 disposed below the floor deck body 200, and a plurality of vibration isolation mounting components 400 disposed between the floor deck body 200 and the lower layer 300. The vibration isolation mounting components 400 are used to connect the floor deck body 200 and the lower layer 300, so that the lower layer 300 is installed below the floor deck body 200.

[0019] In one embodiment, the floor deck body 200 is a steel truss floor deck, including a fine aggregate concrete base plate 210 and a steel truss 220 disposed above the fine aggregate concrete base plate 210. The fine aggregate concrete base plate 210 can serve as a permanent bottom formwork for concrete pouring during construction and provide an installation foundation for the vibration isolation installation assembly 400.

[0020] It should be noted that the cast-in-place concrete layer 800 is a structural layer poured on the construction site above the floor deck 200. It is a separate part from the floor deck 200 and is not a component of the floor deck 200. After the floor deck 200 is installed, concrete is poured on top of the floor deck 200 so that the concrete covers at least part of the steel truss 220 and forms the cast-in-place concrete layer 800.

[0021] Furthermore, the lower layer slab 300 is disposed below the fine aggregate concrete base slab 210 and spaced apart from it. In this embodiment, the lower layer slab 300 is a cement fiberboard, which can serve as the bottom layer of the multifunctional hollow floor deck 100 and form a panel facing the lower building space.

[0022] Furthermore, referring to Figure 11 and Figure 12 A multifunctional hollow floor deck 100 is installed between two secondary beams 700. Multiple vibration isolation mounting components 400 are arranged parallel to each other, each extending along the length of the floor deck body 200. The multiple vibration isolation mounting components 400 are arranged at intervals along the width of the floor deck body 200. The length of the floor deck body 200 can be understood as the extension direction of the vibration isolation mounting components 400, and the width direction is the direction intersecting with the extension direction of the vibration isolation mounting components 400. Two adjacent vibration isolation mounting components 400 form the boundaries of opposite sides of the cavity 500. The fine stone concrete base plate 210 forms the upper boundary of the cavity 500, and the cement fiber board, which serves as the lower layer plate 300, forms the lower boundary of the cavity 500, thereby enclosing and forming the cavity 500 extending along the length of the floor deck body 200.

[0023] Furthermore, referring to Figure 15 Multiple vibration isolation mounting components 400 are arranged side-by-side between the floor deck slab body 200 and the lower plate 300, with each vibration isolation mounting component 400 extending continuously along the length of the floor deck slab body 200. A cavity 500 is formed between two adjacent vibration isolation mounting components 400, with each vibration isolation mounting component 400 constituting the side boundary of the corresponding cavity 500. The floor deck slab body 200 and the lower plate 300 respectively constitute the upper and lower boundaries of the cavity 500. Thus, while connecting the floor deck slab body 200 and the lower plate 300, the multiple vibration isolation mounting components 400 divide the space between the floor deck slab body 200 and the lower plate 300 into multiple parallel extending cavities 500.

[0024] When multiple floor decking bodies 200 are laid side by side, the edges of adjacent floor decking bodies 200 correspond to each other, so that the floor decking bodies 200 together form a continuous upper slab layer; the vibration isolation mounting components 400 set under different floor decking bodies 200 are arranged in a predetermined direction, so that the corresponding cavities 500 can be arranged according to the needs of air supply, return air or pipeline laying. The lower slab 300 is connected to the bottom of the multiple vibration isolation mounting components 400, and together they form a continuous lower slab layer.

[0025] In one specific embodiment, reference is made to... Figure 10 , Figure 11 and Figure 12The room with the multi-functional hollow floor deck 100 installed can have a span of 4.3m and a depth of 3.3m. The floor deck body 200 can be 3300mm long and is laid along the depth of the room; the standard width of the floor deck body 200 can be 1200mm, and the thickness of the lower layer 300 can be 12mm, serving as both the bottom layer of the cavity 500 and the decorative layer facing the lower building space.

[0026] Three standard floor decking plates, each 1200mm wide, and one adjustable floor decking plate, each 700mm wide, are arranged along the room's span, for a total width of 4300mm. Within these dimensions, the center-to-center distance between adjacent vibration isolation mounting components 400 can be 600mm, and the seven vibration isolation mounting components 400 can enclose six independent cavities 500.

[0027] Optionally, the clear height of cavity 500 is not less than 80mm, preferably 100mm. The clear height of cavity 500 affects the acoustic coupling between the upper and lower plates and the cavity resonance characteristics. If the clear height of cavity 500 is too small, the equivalent stiffness of the air layer increases, the acoustic coupling between the upper and lower plates is enhanced, and the sound insulation performance of some frequency bands may be weakened. Setting the clear height of cavity 500 to 100mm can provide installation space for ventilation and pipeline laying while ensuring the acoustic buffering effect of the cavity.

[0028] In other embodiments, the clear height of the cavity 500 can be adjusted according to the requirements of sound insulation performance, ventilation volume, pipeline size, and the height of the lower building space. Specifically, the cavity 500 is formed between the fine aggregate concrete base slab 210 and the cement fiberboard serving as the lower layer 300. The fine aggregate concrete base slab 210 forms the upper wall of the cavity 500, and the cement fiberboard forms the lower wall of the cavity 500.

[0029] Reference Figure 1 and Figure 2 Each vibration isolation mounting assembly 400 includes a load-bearing keel 410, two limiting members 420, and a vibration isolator 430. The load-bearing keel 410 serves as the upper connecting member of the vibration isolation mounting assembly 400, and its upper part is fixedly connected to the floor deck body 200; the two limiting members 420 are respectively disposed on opposite sides of the load-bearing keel 410, and serve as the lower connecting members of the vibration isolation mounting assembly 400, connecting to the lower floor deck 300.

[0030] Furthermore, the vibration isolator 430 is disposed between the load-bearing keel 410 and the two limiting members 420. The force between the load-bearing keel 410 and the two limiting members 420 is transmitted through the vibration isolator 430, and the vibration isolator 430 keeps the load-bearing keel 410 and the two limiting members 420 at a distance.

[0031] Furthermore, referring to Figure 7 , Figure 8 and Figure 9 The supporting keel 410 includes a keel body 411 and two extensions 414 respectively disposed on opposite sides of the keel body 411. The keel body 411 includes a connecting plate 412 and two support plates 413. The connecting plate 412 extends along the length of the floor deck body 200, and the two support plates 413 extend downward from opposite sides of the connecting plate 412, so that the connecting plate 412 and the two support plates 413 together form an internal space with an opening facing downward. The two extensions 414 extend in opposite directions from the lower ends of the two support plates 413, forming a lateral extension structure for cooperating with the limiting member 420.

[0032] Specifically, the connecting plate 412 is attached to the lower surface of the fine aggregate concrete base plate 210 and fixed to the fine aggregate concrete base plate 210 by expansion bolts, so that the load-bearing keel 410 extends along the length direction of the fine aggregate concrete base plate 210. The expansion bolts pass through the connecting plate 412 and are anchored in the fine aggregate concrete base plate 210 to achieve a fixed connection between the load-bearing keel 410 and the floor deck body 200; the load-bearing keel 410 can be integrally bent from a metal sheet, so that the connecting plate 412, the two support plates 413 and the two extensions 414 form a continuous structure; in other embodiments, the parts can also be formed separately and then connected by welding or fastening to form the load-bearing keel 410.

[0033] Reference Figure 4 , Figure 5 and Figure 6 Each limiting member 420 includes a side plate 421 and two limiting plates 422 respectively connected to opposite sides of the side plate 421. The two limiting plates 422 extend from both sides of the side plate 421 in the same direction, and the side plate 421 and the two limiting plates 422 together form a receiving portion 423. The side plate 421 forms the bottom wall of the receiving portion 423, and the two limiting plates 422 respectively form the side walls of opposite sides of the receiving portion 423. An opening is formed between the ends of the two limiting plates 422 away from the side plate 421. The two limiting members 420 are respectively disposed on opposite sides of the supporting keel 410 and are disposed opposite to the supporting keel 410. The openings of the two receiving portions 423 face the supporting keel 410 respectively. The extension 414 on one side of the supporting keel 410 extends at least partially into the corresponding receiving portion 423 through an opening, and the extension 414 on the other side of the supporting keel 410 extends at least partially into another receiving portion 423 through an opening. The limiting member 420 can be integrally bent from a metal sheet, so that the side plate 421 and the two limiting plates 422 form a continuous groove structure.

[0034] Furthermore, two limiting members 420 are respectively disposed on the left and right sides of the supporting keel 410. Both limiting members 420 extend continuously along the length direction of the supporting keel 410, and the length of each limiting member 420 is equal to the length of the supporting keel 410. The two limiting members 420 are respectively disposed with two extensions 414 along the entire length of the supporting keel 410, so that the two extensions 414 extend continuously into the corresponding receiving portions 423 along the length direction of the supporting keel 410. Thus, the two limiting members 420 can provide continuous support for the lower plate 300 along the entire length of the supporting keel 410, and can form the side boundary of the cavity 500 together with the supporting keel 410.

[0035] Furthermore, referring to Figure 2 and Figure 3 The vibration isolator 430 includes two vibration isolating portions 431 respectively disposed within two receiving portions 423. The outer surface of each vibration isolating portion 431 is in contact with the bottom wall and side wall of the corresponding receiving portion 423, such that the vibration isolating portion 431 is disposed between the extension portion 414 and the limiting member 420. The vibration isolating portion 431 extends along the length direction of the corresponding limiting member 420 to form a continuous elastic support between the extension portion 414 and the limiting member 420; each vibration isolating portion 431 has a limiting groove 432 on the side facing the corresponding extension portion 414, and the limiting groove 432 extends along the length direction of the vibration isolating portion 431. The edge of the extension portion 414 away from the corresponding support plate 413 is embedded in the limiting groove 432, such that the upper side, lower side and edge of the extension portion 414 are separated from the limiting member 420 by the vibration isolating portion 431. The limiting groove 432 can also restrict the movement of the extension 414 relative to the vibration isolation part 431, so that the vibration isolation part 431 is kept between the extension 414 and the inner wall of the receiving part 423.

[0036] It should be noted that the vibration isolation part 431 can use the clamping force of the elastic material itself to elastically clamp the extension part 414, and the limiting groove 432 can form a fitting relationship with the edge of the extension part 414. Without using additional fasteners to connect the load-bearing keel 410 and the limiting member 420, the lateral movement of the load-bearing keel 410 relative to the limiting member 420 or its dislodgement from the receiving part 423 can be restricted. At the same time, the vibration isolation part 431 can elastically deform in the vertical direction, allowing the load-bearing keel 410 and the limiting member 420 to produce a small vertical relative displacement when subjected to force.

[0037] Furthermore, the vibration isolator 430 also includes a limiting protrusion 433 located between the two vibration isolating parts 431. The limiting protrusion 433 protrudes upward from the middle of the vibration isolator 430 and extends at least partially into the internal space enclosed by the connecting plate 412 and the two support plates 413. A deformation gap 435 is formed between the upper surface of the limiting protrusion 433 and the inner surface of the connecting plate 412 facing the lower plate 300. When the supporting keel 410 and the limiting member 420 undergo a small relative displacement, the deformation gap 435 can provide space for the elastic deformation of the limiting protrusion 433 and adjacent parts; when the relative displacement increases, the limiting protrusion 433 can cooperate with the inner wall of the keel body 411 to limit the two from continuing to move relative to each other.

[0038] Furthermore, the vibration isolator 430 is also provided with two limiting protrusions 434. The two limiting protrusions 434 are respectively disposed on the side of the two vibration isolating parts 431 facing the keel body 411. Each limiting protrusion 434 is located between the end of the limiting plate 422 of the corresponding limiting member 420 facing the keel body 411 and the adjacent support plate 413. When the limiting member 420 moves toward the keel body 411, the end of the limiting member 420 facing the keel body 411 abuts against the limiting protrusion 434, thereby restricting the limiting member 420 from continuing to move toward the keel body 411 and preventing the limiting member 420 from directly contacting the support plate 413.

[0039] Specifically, the two vibration isolation parts 431, the limiting protrusions 433, and the two limiting protrusions 434 can be integrally molded from elastic materials to reduce the connection interfaces between the parts and maintain the continuity of the overall structure of the vibration isolator 430. In this embodiment, the vibration isolator 430 can be made of polyurethane elastomer, nitrile rubber, neoprene rubber, or other high-damping elastic materials, and the Young's modulus of the vibration isolator 430 is 0.5MPa to 5MPa. When the Young's modulus of the vibration isolator 430 is lower than 0.5MPa, the stiffness of the vibration isolator 430 is low, and it is prone to large vertical compressive deformation under normal use loads, which may affect the flatness and long-term stability of the lower plate 300. When the Young's modulus of the vibration isolator 430 is higher than 5MPa, the vibration isolator 430 approaches a rigid component, and its elastic deformation capacity and vibration energy dissipation capacity decrease, making it difficult to effectively weaken the vibration transmission between the load-bearing keel 410 and the limiting member 420. Therefore, setting the Young's modulus of the vibration isolator 430 to 0.5MPa to 5MPa can balance the stability of the elastic support and the vibration damping effect.

[0040] Furthermore, referring to Figure 1 , Figure 2 and Figure 5The lower plate 300 is detachably connected to the limiting member 420 via multiple fasteners 600. The limiting member 420 has multiple mounting holes on its limiting plate 422 facing the lower plate 300, with these holes spaced apart along the length of the limiting member 420. The lower plate 300 has through holes corresponding to each mounting hole. Each fastener 600 passes through the corresponding through hole from the side of the lower plate 300 away from the floor deck body 200 and connects to the limiting member 420.

[0041] In one specific embodiment, a T-sleeve is provided at the through-hole position of the lower plate 300, and a bolt hole is provided at the corresponding position of the limiting plate 422. The fastener 600 is a thin-head hexagon socket head cap screw, which passes through the through-hole from the bottom of the lower plate 300 and connects with the bolt hole on the T-sleeve and the limiting plate 422. The thin-head hexagon socket head cap screw can also be used with washers and lock nuts to improve connection stability.

[0042] In cases where auxiliary positioning is required, a peelable adhesive layer can be provided between the contact surfaces of the limiting plate 422 and the lower plate 300 to provide auxiliary positioning of the lower plate 300 before the fastener 600 is installed.

[0043] In one embodiment, the fastener 600 extends upward from the side of the lower plate 300 away from the floor deck body 200, and sequentially passes through the lower plate 300, the limiting member 420, and the vibration isolator 430 located within the receiving portion 423. The fastener 600 is positioned outside the corresponding extension 414, and a gap is maintained between the fastener 600 and the extension 414 and other parts of the supporting joists 410, with the gap area filled by the vibration isolator 430. Therefore, although the fastener 600 passes through the vibration isolator 430, it is only used to connect the lower plate 300 and the limiting member 420, and does not form a rigid connection with the supporting joists 410, thereby avoiding the formation of a rigid transmission path that bypasses the vibration isolator 430 between the lower plate 300 and the supporting joists 410.

[0044] The load-bearing keel 410 forms an upper connection with the floor deck 200, and the limiting member 420 forms a lower connection with the lower panel 300. The upper and lower connections are structurally independent. When it is necessary to disassemble or replace the lower panel 300, the fasteners 600 and the optional peelable adhesive layer can be released. It is not necessary to disconnect the connection between the load-bearing keel 410 and the floor deck 200, nor is it necessary to change the fit between the vibration isolator 430 and the load-bearing keel 410.

[0045] Furthermore, the density of the cement fiberboard can be between 1600 kg / m³ and 1900 kg / m³. Cement fiberboard has a high areal density and can serve as an additional mass layer for the multifunctional hollow floor deck 100. The cement fiberboard has different densities and moduli of elasticity from the upper slab layer composed of the cast-in-place concrete layer 800 and the fine aggregate concrete base slab 210. The upper slab layer and the cement fiberboard are separated by a cavity 500, thus forming a multi-layered heterogeneous material system consisting of the upper slab layer, the cavity 500, and the cement fiberboard. This multi-layered heterogeneous material system can reduce the possibility of simultaneous resonance between the upper slab layer and the lower slab layer 300, and allows vibration energy to be reflected and dissipated at different material and interface points.

[0046] Furthermore, referring to Figure 13 Based on different usage requirements, multiple cavities 500 can be functionally divided. The multiple cavities 500 are independent and separated from each other, including at least two airflow cavities 510 and at least one pipeline cavity 520. The at least two airflow cavities 510 include at least one supply air cavity 511 and at least one return air cavity 512, each with an air outlet 513 communicating with the outside. The pipeline cavity 520 has a pipeline passage opening for pipelines to pass through, which can be located at the end or side of the pipeline cavity 520.

[0047] When cavity 500 is used as airflow cavity 510, the ends of airflow cavity 510, the splicing positions between adjacent precast floor deck units, and other openings except for air outlet 513 and equipment connection positions are sealed to make air supply cavity 511 and return air cavity 512 airtightly separated from each other, reducing the crossflow between supply and return air.

[0048] Furthermore, a joint is formed at the connection between adjacent floor decking slabs 200, and the joint is filled with sound-insulating sealant 810 to seal the gap between adjacent floor decking slabs 200. A joint is formed between the corresponding load-bearing joists 410 of adjacent floor decking slabs 200, and the joint is also filled with sound-insulating sealant 810 to reduce the transmission of sound and airflow through the joint. A joist boundary joint is formed between the load-bearing joists 410 located at the edge of the laying area and the secondary beam 700, and a slab-beam boundary joint is formed between the floor decking slabs 200 and the secondary beam 700. The joist boundary joint and the slab-beam boundary joint are respectively filled with closed-cell polyethylene foam strips 820, and flexible sealant 830 is embedded at the corresponding joint openings. The closed-cell polyethylene foam strip 820 can fill the boundary gap and provide elastic cushioning, while the flexible sealant 830 can seal the gap and adapt to the slight relative deformation between the floor deck body 200 and the secondary beam 700, thereby reducing the transmission of sound and airflow through the boundary gap and reducing the possibility of the floor deck body 200 or the load-bearing joist 410 forming a sound bridge through direct rigid contact with the secondary beam 700.

[0049] In this embodiment, the thickness of the fine aggregate concrete base slab 210 can be 20mm. The sound insulation sealant 810 and the flexible sealant 830 can be building sealing materials with elasticity and adhesive properties. The size of the closed-cell polyethylene foam strip 820 can be selected according to the width of the corresponding gap so that the closed-cell polyethylene foam strip 820 stays in contact with both sides of the gap after filling.

[0050] In one specific embodiment, seven vibration isolation mounting components 400 enclose four cavities 500. The first cavity 500 serves as an air supply cavity 511, with its corresponding air outlet 513 located near the room's doorway and connected to the air supply end of an air conditioning unit or fresh air system to deliver treated air into the room. The third cavity 500 serves as a return air cavity 512, with its corresponding air outlet 513 located near the room's exterior window and connected to the return air end of an air conditioning unit or fresh air system to deliver indoor air to the corresponding equipment. The air supply cavity 511 and the return air cavity 512 are separated from each other, creating a directional airflow from the doorway side to the exterior window side, reducing the possibility of short-circuiting between the supply and return air.

[0051] Furthermore, the second cavity 500 serves as a cavity 520 for both high-voltage and low-voltage electrical conduits. High-voltage and low-voltage electrical lines are respectively located on different sides of this cavity 520, and a metal shielding partition can be installed between the high-voltage and low-voltage lines. The fourth cavity 500 serves as a cavity 520 for water supply, drainage, and fire protection conduits. Water supply, drainage, and fire protection pipes can be laid in layers, and a waterproof tray can be installed below the pipes. An inspection port can also be provided on the side of the fourth cavity 500 near the secondary beam 700 for inspection of pipe joints. (The above cavity modifications correspond to the illustrated modifications in the invention document.) Furthermore, the airflow cavity 510 has a large ventilation cross-section, which can control the airflow velocity within the airflow cavity 510 to about 5m / s while meeting the design air volume, thereby reducing airflow noise and pressure loss along the flow path; the air outlet velocity at the air outlet 513 can be further adjusted according to the indoor air supply requirements. The airflow cavity 510 is directly formed between the floor deck body 200 and the lower layer plate 300, thus reducing the use of additional air ducts and their mounting brackets.

[0052] Furthermore, the cavity 500 can also form an acoustic buffer space. After sound waves enter the cavity 500, they can be incident, reflected, and attenuated within it, reducing the sound energy propagating to the lower panel 300, and working in conjunction with the vibration damping effect of the vibration isolator 430. The lower panel 300 simultaneously forms the bottom wall of the cavity 500 and the decorative surface facing the lower building space, thereby reducing the need for additional ceiling structures. In some buildings, this structure can reduce the ceiling height by approximately 200mm to 300mm.

[0053] Furthermore, the load-bearing keel 410 serves as the upper fixed end, the vibration isolator 430 as the elastic element, and the limiting member 420, fastener 600, and lower plate 300 as the supported mass layer, together constituting an elastic support system. The natural frequency of this elastic support system can be determined according to the following formula: ; Where f0 is the natural frequency of the elastic support system, in Hz; s′ is the dynamic stiffness per unit area of ​​the vibration isolator 430 in the installed state, in MN / m³; and m′ is the equivalent mass per unit area of ​​the mass layer formed by the lower plate 300, limiting member 420, and related connecting components supported by the vibration isolator 430, in kg / m². By selecting vibration isolators 430 with a Young's modulus of 0.5MPa to 5MPa and configuring the areal density of the cement fiberboard, s′ and m′ can be adjusted to ensure that the natural frequency of the elastic support system avoids the impact vibration frequency band that needs to be controlled, thereby reducing the possibility of resonance amplification.

[0054] When the cast-in-place concrete layer 800, the fine aggregate concrete base slab 210, the vibration isolation mounting assembly 400, and the lower plate 300 are considered as a series system along the selected main vibration transmission path, the vibration transmission relationship between the equivalent material layers or connection interfaces can be expressed as: ; T is the overall transfer matrix, obtained by multiplying the transfer matrices of each material layer in sequence: T=T1 T2 Tn; Wherein, v1 and F1 are the vibration velocity and force on the input side of the multi-layer composite structure, respectively; v2 and F2 are the vibration velocity and force on the output side, respectively; T is the overall transmission matrix of the multi-layer composite structure; and T1 to Tn are the transmission matrices of each material layer or connection interface, respectively. A transmission interface with different material stiffness is formed between the load-bearing keel 410, the vibration isolator 430, and the limiting member 420, causing vibration energy to be reflected and dissipated during transmission.

[0055] Furthermore, referring to Figure 14 To verify the sound insulation performance of the multifunctional hollow floor deck 100, the impact sound pressure level of six different floor structures in the frequency range of 100Hz to 3150Hz was simulated and calculated. Figure 14 The horizontal axis represents frequency in Hz; the vertical axis represents normalized impact sound pressure level in dB. The lower the impact sound pressure level, the better the floor structure attenuates impact vibrations.

[0056] The six simulated operating conditions are as follows: G1: A composite structure consisting of ceramic tiles, 30mm thick sound-insulating mortar, 150mm thick concrete, and a multi-functional hollow floor deck 100, wherein the thickness of the lower layer of cement fiberboard is 12mm. G2: A composite structure consisting of ceramic tiles, 30mm thick sound-insulating mortar, 120mm thick concrete, and 100mm thick multi-functional hollow floor decking, wherein the thickness of the lower layer of cement fiberboard is 10mm. G3: Floor slab structure consisting of ceramic tiles, 30mm thick sound-insulating mortar, and 150mm thick concrete; G4: Floor slab structure consisting of ceramic tiles, 30mm thick sound-insulating mortar, and 120mm thick concrete; G5: 150mm thick reinforced concrete floor slab; G6: 120mm thick reinforced concrete floor slab.

[0057] Depend on Figure 14 It can be seen that in the lower frequency range of 100Hz to 315Hz, the differences in impact sound pressure levels corresponding to the six floor slab structures are relatively small. As the frequency increases, the impact sound pressure levels corresponding to G1 and G2 decrease significantly, and the decrease is greater than that of G3 and G4. G5 and G6 still maintain relatively high impact sound pressure levels in the mid-to-high frequency range, indicating that the attenuation capacity of a single reinforced concrete floor slab for impact vibration is limited.

[0058] Under the same sound-insulating mortar thickness and the same concrete thickness, G1, compared to G3, added a multi-functional cavity floor decking 100, and G2, compared to G4, added a multi-functional cavity floor decking 100. Comparing the corresponding curves, it can be seen that the impact sound pressure levels of G1 and G2 in the frequency range above 400Hz are significantly lower than those of G3 and G4, and the difference becomes more pronounced at higher frequencies. This result indicates that the vibration isolation installation component 400, the cavity 500, and the lower cement fiberboard can collectively weaken the transmission of impact vibrations to the lower building space.

[0059] Based on the simulation results at each frequency, weighted calculations show that the normalized impact sound pressure level (SPL) is approximately 55 dB for G1, 59 dB for G2, 61 dB for G3, 63 dB for G4, 80 dB for G5, and 83 dB for G6. Therefore, it can be concluded that, with the same concrete slab thickness and sound-insulating mortar thickness, adding a multi-functional hollow floor deck 100 can further reduce the normalized impact SPL.

[0060] The above-mentioned effect is achieved because the vibration isolator 430 installed between the load-bearing keel 410 and the limiting member 420 can weaken the vibration transmission between rigid components; the cavity 500 can cause sound waves to be reflected and attenuated inside; and the cement fiberboard has a large areal density, which can form an additional mass layer. The vibration isolator 430, the cavity 500 and the cement fiberboard work together to form a composite sound insulation structure with the combined effects of elastic vibration isolation, cavity acoustic attenuation and additional mass sound insulation.

[0061] Furthermore, referring to Figure 16 In step S1, a floor deck slab body 200 is provided during the prefabrication stage. The floor deck slab body 200 includes a fine aggregate concrete base slab 210 and a steel truss 220 disposed above the fine aggregate concrete base slab 210. Based on the length and width of the floor deck slab body 200 and the number and width of the cavities 500 to be formed, the installation positions of multiple load-bearing joists 410 are determined on the lower surface of the fine aggregate concrete base slab 210. Specifically, multiple installation reference lines can be marked along the length direction of the floor deck slab body 200 first, and then the spacing between adjacent installation reference lines can be determined along the width direction of the floor deck slab body 200. In one embodiment, the spacing between adjacent installation reference lines is 600 mm, but it can also be adjusted according to the design width of the cavities 500.

[0062] Furthermore, multiple load-bearing joists 410 are placed at corresponding installation reference lines, with each load-bearing joist 410 extending along the length of the floor deck slab body 200 and arranged at intervals along the width of the floor deck slab body 200. The connecting plates 412 of the load-bearing joists 410 are attached to the lower surface of the fine aggregate concrete base slab 210. Anchoring positions are determined through pre-set mounting holes on the connecting plates 412, and expansion bolts are installed at the corresponding anchoring positions to fix the load-bearing joists 410 to the fine aggregate concrete base slab 210. After the multiple load-bearing joists 410 are fixed, the extension direction, adjacent spacing, and parallelism of each load-bearing joist 410 are checked to ensure that the multiple load-bearing joists 410 remain parallel to each other and extend continuously along the length of the floor deck slab body 200, providing an installation foundation for the subsequent installation of the limiting component 420 and the vibration isolator 430.

[0063] Further, in step S2, the vibration isolator 430 is arranged along the length of the bearing keel 410, so that the two vibration isolating parts 431 are located on both sides of the bearing keel 410 respectively, and the edges of the two extensions 414 are pressed into the limiting grooves 432 of the corresponding vibration isolating parts 431 respectively.

[0064] Subsequently, the two limiting members 420 are placed on both sides of the supporting keel 410, so that the openings of the two receiving portions 423 face each other. The two limiting members 420 are pushed toward the supporting keel 410, so that the extension portions 414 on both sides of the supporting keel 410 and the vibration isolation portions 431 covering the outside of the extension portions 414 respectively enter the corresponding receiving portions 423 at least partially, and the vibration isolation portions 431 are clamped between the extension portions 414 and the inner walls of the receiving portions 423. After installation, the clamping state of the vibration isolation body 430 is checked along the length direction of the supporting keel 410 to ensure that there is no direct contact between the extension portions 414, the supporting keel 410 and the limiting members 420, and that the limiting protrusion 434 is located between the limiting member 420 and the keel body 411, and the limiting protrusion 433 extends into the internal space enclosed by the keel body 411 and retains the deformation gap 435, thereby completing the assembly of the vibration isolation installation assembly 400.

[0065] Further, in step S3, the lower plate 300 is moved below the multiple limiting members 420, and the installation position of the lower plate 300 corresponds to the multiple limiting members 420. According to the preset connection positions on the limiting members 420, mounting holes are machined on the lower plate 300; multiple fasteners 600 are passed through the lower plate 300 from the side opposite to the floor deck body 200, and connected to the corresponding limiting members 420. The multiple fasteners 600 are sequentially tightened along the length direction of the limiting members 420, so that the lower plate 300 is connected to the multiple limiting members 420. During the tightening process, the fasteners 600 pass through the vibration isolator 430 located in the receiving portion 423, and the insertion position and depth of the fasteners 600 are controlled to maintain a distance between the fasteners 600 and the corresponding extension portion 414 and other parts of the supporting keel 410.

[0066] After the lower layer slab 300 is installed, the two adjacent load-bearing keels 410 and their corresponding limiting members 420, the floor deck body 200 and the lower layer slab 300 together enclose a cavity 500. According to the predetermined cavity function, before or during the installation of the lower layer slab 300, air vents 513 communicating with the air supply cavity 511 and the return air cavity 512, as well as pipeline penetration openings communicating with the pipeline cavity 520 are reserved respectively; the installation position of the lower layer slab 300 and the connection status of the fasteners 600 are checked, and the communication status between the air supply cavity 511, the return air cavity 512 and the corresponding air vents 513, the communication status between the pipeline cavity 520 and the pipeline penetration opening, and the separation status between adjacent cavities 500 are checked; after confirming that the lower layer slab 300 is installed flat, and that the fasteners 600 pass through the vibration isolator 430 and do not contact the extension 414 and other parts of the load-bearing keel 410, the precast floor deck unit is obtained.

[0067] Further, in step S4, based on the room's floor plan dimensions and the positions of the two secondary beams 700, the installation position, arrangement direction, and hoisting sequence of each precast floor deck unit are determined, and an installation baseline is marked between the two secondary beams 700. Before hoisting, temporary supports are erected below the installation position of the precast floor deck unit, and the top elevation of the temporary supports is adjusted. In one embodiment, the spacing of the temporary supports along the length direction of the floor deck body 200 is no greater than 1.5m, and two temporary supports are set below the width direction of each precast floor deck unit. According to the predetermined hoisting sequence, each precast floor deck unit was sequentially hoisted to the space between the two secondary beams at 700mm. Each time a precast floor deck unit was hoisted, its position and direction of extension were adjusted according to the installation baseline to ensure that the precast floor deck unit accurately fell into its corresponding preset installation position.

[0068] After the precast floor decking units are positioned, the relative positions of adjacent units are adjusted to align their edges and leave a 2mm-3mm joint. Connectors are then used to laterally fix the adjacent units, completing the splicing and positioning. The hoisting and splicing of each unit is completed sequentially, arranging multiple units along the room's plan direction between the two secondary beams at 70mm. Finally, the installation elevation, arrangement, and overall flatness of each unit are checked, and any units with deviations are adjusted.

[0069] Further, in step S5, after the hoisting and splicing of each precast floor deck unit is completed, the installation position, splicing status, and temporary support status of the precast floor deck units are checked. Flexible sealing material is used to seal the splicing joints between adjacent precast floor deck units to prevent concrete leakage downwards from the splicing joints during pouring and to ensure the airtightness of the corresponding airflow cavity 510. After the inspection is completed, concrete is poured above the floor deck body 200. During pouring, concrete is continuously distributed along the arrangement direction of multiple precast floor deck units, and the concrete is vibrated and leveled to cover the steel truss 220 and form a cast-in-place concrete layer 800. During vibration, direct collision between the vibration equipment and the fine aggregate concrete base slab 210, the load-bearing joists 410, and the vibration isolation installation components 400 is avoided to prevent displacement of the precast floor deck units. After the concrete pouring is completed, the cast-in-place concrete layer 800 is cured. After the concrete cast-in-place layer 800 reaches the predetermined strength, the temporary supports are removed, allowing multiple precast floor deck units to be combined into one unit through the concrete cast-in-place layer 800, thus completing the construction of the multifunctional cavity floor deck 100.

[0070] Furthermore, during use, the vibrations generated by the floor deck slab 200 are transmitted sequentially to the lower slab 300 through the supporting joists 410, vibration isolators 430, limiting members 420, and fasteners 600. The vibration isolator 430 is sandwiched between the extension 414 of the supporting joists 410 and the receiving portion 423 of the limiting members 420, thus isolating the supporting joists 410 and the limiting members 420 from each other. Although the fasteners 600 pass through the vibration isolators 430, they do not contact the extension 414 or other parts of the supporting joists 410, thus preventing the formation of a rigid acoustic bridge bypassing the vibration isolators 430 between the lower slab 300 and the supporting joists 410. The vibration isolators 430 can dissipate some vibration energy through elastic deformation and material damping, weakening the transmission of vibration to the lower slab 300. Meanwhile, the multiple cavities 500 formed between the floor deck body 200 and the lower plate 300 are separated from each other and can be used as air supply cavity 511, return air cavity 512 and pipeline cavity 520 respectively, thereby integrating vibration isolation and noise reduction, air transportation and pipeline laying functions into the floor deck structure.

[0071] The above is only used to illustrate the technical solution of the present invention and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of the present invention, as long as they do not depart from the spirit and scope of the technical solution of the present invention, should be covered within the scope of the claims of the present invention.

Claims

1. A multifunctional hollow floor deck, comprising a floor deck body (200), a lower layer plate (300) disposed below the floor deck body (200), and a plurality of vibration isolation mounting components (400) disposed between the floor deck body (200) and the lower layer plate (300), characterized in that, The vibration isolation mounting assembly (400) includes: The load-bearing keel (410) is fixedly connected to the floor deck body (200). The load-bearing keel (410) includes a keel body (411) and two extensions (414) respectively provided on opposite sides of the keel body (411). Two limiting members (420) are respectively provided corresponding to the two extensions (414). The limiting members (420) are connected to the lower plate (300). Each limiting member (420) is provided with a receiving portion (423). The two extensions (414) extend at least partially into the corresponding receiving portion (423); and Vibration isolator (430) is disposed in the receiving part (423) and sandwiched between the extension part (414) and the inner wall of the receiving part (423) so that the bearing keel (410) is separated from the limiting member (420); Multiple vibration isolation mounting components (400) extend along the length of the floor deck body (200) and are spaced apart. Two adjacent vibration isolation mounting components (400), the floor deck body (200) and the lower plate (300) enclose a cavity (500).

2. The multifunctional hollow floor decking according to claim 1, characterized in that, The main body of the keel (411) includes a connecting plate (412) and two support plates (413) extending downward from opposite sides of the connecting plate (412). The two extensions (414) extend from the lower ends of the two support plates (413) in opposite directions. The connecting plate (412) is attached to and installed on the lower surface of the floor deck body (200).

3. The multifunctional hollow floor decking according to claim 1, characterized in that, The limiting member (420) includes a side plate (421) and two limiting plates (422) respectively connected to opposite sides of the side plate (421). The side plate (421) and the two limiting plates (422) surround to form the receiving portion (423), and the openings of the two receiving portions (423) are arranged opposite to each other.

4. The multifunctional hollow floor decking according to claim 3, characterized in that, The vibration isolator (430) includes two vibration isolating parts (431) respectively disposed in the two receiving parts (423). Each vibration isolating part (431) is attached to the bottom wall and side wall of the corresponding receiving part (423), and each vibration isolating part (431) is provided with a limiting groove (432) on the side facing the corresponding extension (414). The edge of the extension (414) is embedded in the corresponding limiting groove (432).

5. The multifunctional hollow floor decking according to claim 4, characterized in that, The vibration isolator (430) also includes a limiting protrusion (433) located between the two vibration isolators (431), the limiting protrusion (433) extending at least partially into the internal space enclosed by the keel body (411) and forming a deformation gap (435) with the inner wall of the keel body (411).

6. The multifunctional hollow floor decking according to claim 1, characterized in that, The lower plate (300) is detachably connected to the limiting member (420) by a plurality of fasteners (600). The plurality of fasteners (600) are spaced apart along the length direction of the limiting member (420). Each fastener (600) is inserted through the lower plate (300) on the side of the lower plate (300) away from the floor deck body (200) and connected to the limiting member (420).

7. The multifunctional hollow floor decking according to claim 4, characterized in that, The vibration isolator (430) also includes a limiting protrusion (434), which is located between the side wall and the keel body (411). The limiting protrusion (434) is used to restrict the movement of the limiting member (420) toward the keel body (411).

8. The multifunctional hollow floor decking according to claim 1, characterized in that, The floor deck body (200) is a steel truss floor deck, which includes a fine stone concrete base plate (210) and a steel truss (220) disposed above the fine stone concrete base plate (210). The lower plate (300) is a cement fiber board, and the cavity (500) is formed between the fine stone concrete base plate (210) and the cement fiber board.

9. The multifunctional hollow floor decking according to claim 1, characterized in that, The plurality of cavities (500) are separated from each other, including at least two airflow cavities (510) and at least one pipeline cavity (520). The airflow cavity (510) is provided with an air outlet (513) communicating with the outside, and the pipeline cavity (520) is provided with a pipeline passage opening for pipelines to pass through.

10. The multifunctional cavity floor decking according to claim 7, characterized in that, The limiting protrusion (434) is integrally formed with the vibration isolator (430), and the Young's modulus of the vibration isolator (430) is 0.5MPa to 5MPa.

11. A construction method for a multifunctional hollow floor decking, applied to the multifunctional hollow floor decking as described in any one of claims 1-10, characterized in that, include: S1. Provide a floor deck body (200), the floor deck body (200) includes a fine stone concrete base plate (210) and a steel truss disposed above the fine stone concrete base plate (210), and extend multiple load-bearing keels (410) along the length direction of the floor deck body (200) and fix them at intervals along the width direction of the floor deck body (200) to the lower surface of the fine stone concrete base plate (210); S2. Limiting members (420) are provided on both sides of each of the bearing keels (410), and the extensions (414) on both sides of the bearing keel (410) are at least partially inserted into the receiving portion (423) of the corresponding limiting member (420), and the vibration isolator (430) is sandwiched between the inner wall of the extension (414) and the receiving portion (423) to separate the bearing keel (410) from the limiting member (420); S3. Connect the lower plate (300) to a plurality of the limiting members (420) so that two adjacent load-bearing keels (410) and the corresponding limiting members (420), the floor deck body (200) and the lower plate (300) enclose a cavity (500) to obtain a prefabricated floor deck unit, wherein the fasteners (600) connecting the lower plate (300) and the limiting members (420) are spaced apart from the vibration isolator (430) and the load-bearing keel (410); S4. Hoist the precast floor deck unit to the preset installation position and splice adjacent precast floor deck units; S5. A cast-in-place concrete layer (220) is poured on top of the floor deck body (200) so that the precast floor deck unit and the cast-in-place concrete layer (220) form an integral unit.

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