A prefabricated floor structure

Abstract

The application provides a prefabricated floor structure, which comprises prefabricated concrete floors, embedded steel plates, connecting cover plates and fasteners; the connecting end top surface and bottom surface of the prefabricated concrete floors are respectively provided with upper embedded steel plates and lower embedded steel plates; and the connecting end of the prefabricated concrete floor is provided with a through hole penetrating the connecting end top surface and bottom surface and the upper embedded steel plate and the lower embedded steel plate; the connecting cover plate is provided with through holes at both ends; when two prefabricated concrete floors are connected, the two ends of the upper and lower connecting cover plates are respectively attached to the upper embedded steel plate and the lower embedded steel plate; and the fasteners are connected and fixed to the two prefabricated concrete floors after penetrating the through hole and the through hole. In the application, the connecting cover plate can coordinate the deformation of two adjacent prefabricated concrete floors, and at the same time, provide bending resistance and shearing stiffness, so that the shearing stiffness and bearing capacity of the floor joint are greatly increased, the structure is simple, the construction is convenient and fast, the construction period can be greatly shortened, and the application is convenient for local replacement and updating in the later period.

Description

Technical Field

[0001] This invention relates to the field of prefabricated building technology, and in particular to a prefabricated floor slab structure. Background Technology

[0002] As a crucial component of the overall building structure, the floor slab not only bears the dead and live loads of the floors but also transfers seismic and wind loads to the various lateral resisting systems. Traditional steel-cast-in-place concrete floor slabs offer good load-bearing performance and economy, but they suffer from drawbacks such as large on-site formwork, reinforcement, and concrete pouring operations, slow construction speed, and high labor costs. Furthermore, they cause significant environmental pollution, contradicting the development concepts of industrialized and green building. To meet the demands of industrialized construction, current steel-concrete composite floor slab forms mainly include traditional truss-reinforced floor slabs, removable bottom-formwork truss-reinforced floor slabs, and composite slab floor slabs. However, market validation has shown that these products are not yet mature solutions for residential building floor slabs. Traditional truss-reinforced floor decks with exposed profiled steel sheets are aesthetically unappealing, hinder decoration, and result in a poor user experience, leading to low consumer acceptance in residential buildings. Removable bottom formwork truss-reinforced floor decks involve complex construction processes, and the actual reusability of the bottom formwork is low, resulting in high costs. Composite slab floor decks require an actual slab thickness greater than 150mm, which is not suitable for residential buildings where the slab thickness is generally 100-120mm. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated floor slab structure to solve at least one of the aforementioned technical problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the present invention provides a precast floor structure, comprising: a precast concrete floor slab, an embedded steel plate, a connecting cover plate, and fasteners;

[0005] The embedded steel plate includes an upper embedded steel plate and a lower embedded steel plate;

[0006] The top and bottom surfaces of the connecting end of the precast concrete floor slab are respectively provided with an upper embedded steel plate and a lower embedded steel plate; and the connecting end of the precast concrete floor slab is provided with a through hole that passes through the upper and lower parts of the connecting end as well as the upper and lower embedded steel plates.

[0007] The connecting cover plate has through holes at both ends;

[0008] When the two precast concrete floor slabs are joined together, the two ends of the upper and lower connecting cover plates are respectively attached to the upper and lower embedded steel plates; the fasteners pass through the through holes and the through holes to connect and fix the two precast concrete floor slabs.

[0009] Furthermore, the top surface of the connecting end of the precast concrete floor slab is provided with an upper sinking platform for receiving the connecting cover plate above, and the upper embedded steel plate is the platform surface of the sinking platform.

[0010] Furthermore, after the upper connecting cover plate is attached to the upper embedded steel plate, the top surface of the lower connecting cover plate is recessed into the upper sinking platform.

[0011] Furthermore, a sunken platform for receiving the connecting cover plate below is provided on the bottom surface of the connecting end of the precast concrete floor slab, and the lower embedded steel plate is the platform of the sunken platform.

[0012] Furthermore, after the connecting cover plate is attached to the lower embedded steel plate, the bottom surface of the lower connecting cover plate is recessed into the sunken platform.

[0013] Furthermore, it also includes embedded parts, one end of which is embedded in the precast concrete floor slab, and the other end of which extends out of the precast concrete floor slab and is fixedly connected to the embedded steel plate.

[0014] Specifically, the embedded parts and embedded steel plates are welded in the factory, and the concrete floor slab is prefabricated at the same time. The embedded steel plates are fixedly connected to the prefabricated concrete floor slab through the embedded parts.

[0015] Furthermore, in the precast concrete floor slab, the embedded parts are arranged longitudinally, and the embedded parts are arranged alternately with the transverse reinforcing bars.

[0016] Furthermore, the fasteners are double-ended bolts and nuts, connecting pins, or rivets, etc.

[0017] Preferably, the fasteners include torsion-shear type high-strength bolts and nuts.

[0018] Furthermore, the embedded part is an anchor bar or a steel cable.

[0019] Furthermore, the length of the anchor bar must be greater than or equal to 35d. The length of the steel cable should be sufficient to ensure the intended anchoring effect. Additionally, the embedded steel plate, connecting cover plate, and fasteners must be treated for rust prevention.

[0020] Furthermore, in the width direction of the connection end of the precast concrete floor slab, multiple sets of the embedded steel plates, connecting cover plates and fasteners are arranged at intervals.

[0021] By adopting the above technical solution, the present invention has the following beneficial effects:

[0022] The present invention provides a precast floor structure in which connecting cover plates on the upper and lower sides and embedded steel plates clamp the ends of the precast concrete floor slabs in the middle, forming an integral structure between the two butt-jointed precast concrete floor slabs. The connecting cover plates can coordinate the deformation of the two adjacent precast concrete floor slabs and provide bending and shear stiffness, thereby greatly increasing the shear stiffness and load-bearing capacity at the joint. It has the characteristics of simple structure, convenient and quick construction, which can greatly shorten the construction period and facilitate subsequent partial replacement and replacement. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is an exploded view of the prefabricated floor slab structure provided in Embodiment 1 of the present invention;

[0025] Figure 2 This is a schematic diagram of the precast concrete floor slab in Example 1;

[0026] Figure 3 This is a schematic diagram of the prefabricated floor slab structure provided in Embodiment 1 of the present invention;

[0027] Figure 4 This is a top view of the prefabricated floor slab structure provided in Embodiment 1 of the present invention;

[0028] Figure 5 This is a partial structural diagram of the precast floor slab structure provided in Embodiment 2 of the present invention;

[0029] Figure 6 This is a diagram showing the connection structure between the precast concrete floor slab and the steel beam in Example 2;

[0030] Figure 7 This is a schematic diagram of the steel beam structure in the embodiment;

[0031] Figure 8 This is a schematic diagram of another embodiment of the connecting steel plate in Embodiment 2 of the present invention;

[0032] Figure 9 This is a schematic diagram of another embodiment of the steel beam in Embodiment 2 of the present invention.

[0033] Figure label:

[0034] 10-Precast concrete floor slab; 11-Continuous reinforcing bar; 12-Intermediate connector; 13-Groove; 20-Steel beam; 21-Upper flange plate; 21a-Connecting hole; 22-Web plate; 23-Lower flange plate; 24-Stud; 25-Limiting plate; 25a-Horizontal elongated hole; 30-Connecting steel plate; 31-Snap-fit ​​part; 31a-Vertical elongated hole; 32-Concrete tenon hole; 33-Bolt; 34-Nut; 35-Reinforcing bar hole; 40-Connecting short plate; 50-Embedded steel plate; 51-Upper embedded steel plate; 52-Lower embedded steel plate; 53-Through hole; 54-Upper recessed platform; 55-Lower recessed platform; 60-Connecting cover plate; 61-Through hole; 70-Fastener; 80-Embedded part; 81-Transverse reinforcing bar. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0038] The present invention will be further explained below with reference to specific embodiments.

[0039] Example 1

[0040] like Figure 1-3As shown, this embodiment provides a precast floor structure, including: a precast concrete floor slab 10, an embedded steel plate 50, a connecting cover plate 60, and fasteners 70; the embedded steel plate 50 includes an upper embedded steel plate 51 and a lower embedded steel plate 52.

[0041] The upper embedded steel plate 51 and the lower embedded steel plate 52 are respectively pre-embedded on the top and bottom surfaces of the connection end of the precast concrete floor slab 10; and the connection end of the precast concrete floor slab 10 is provided with a through hole 53 that passes through the upper and lower parts of the connection end as well as the upper embedded steel plate 51 and the lower embedded steel plate 52.

[0042] The connecting cover plate 60 has through holes 61 at both ends; when the two precast concrete floor slabs 10 are joined together, the two ends of the upper and lower connecting cover plates 60 are respectively attached to the upper embedded steel plate 51 and the lower embedded steel plate 52; the fasteners 70 pass through the through hole 53 and the through hole 61 to connect and fix the two precast concrete floor slabs 10.

[0043] Preferably, a recessed platform 54 for receiving the upper connecting cover plate 60 is provided on the top surface of the connecting end of the precast concrete floor slab 10, and the upper embedded steel plate 51 serves as the platform surface of the recessed platform 54. After the upper connecting cover plate 60 is abutted against the upper embedded steel plate 51, the top surface of the lower connecting cover plate 60 is recessed into the recessed platform, that is, the top surface of the lower connecting cover plate 60 is lower than the top surface of the precast concrete floor slab 10.

[0044] A recessed platform 55 for receiving the lower connecting cover plate 60 is provided on the bottom surface of the connecting end of the precast concrete floor slab 10, and the lower embedded steel plate 52 serves as the platform surface of the recessed platform 55. After the lower connecting cover plate 60 is abutted against the lower embedded steel plate 52, the bottom surface of the lower connecting cover plate 60 is recessed into the recessed platform, that is, the bottom surface of the lower connecting cover plate 60 is higher than the bottom surface of the connecting end of the precast concrete floor slab 10.

[0045] This embodiment also includes an embedded part 80, one end of which is embedded in the precast concrete floor slab 10, and the other end of which extends out of the precast concrete floor slab 10 and is fixedly connected to the embedded steel plate 50.

[0046] Specifically, the embedded part 80 and the embedded steel plate 50 are welded together in the factory, and the concrete floor slab is prefabricated simultaneously. The embedded steel plate 50 is fixedly connected to the prefabricated concrete floor slab 10 through the embedded part 80. (Refer to...) Figure 2 As shown, in the precast concrete floor slab 10, embedded parts 80 are arranged longitudinally, and the embedded parts 80 are staggered with the transverse reinforcing bars 81. The embedded parts 80 can be anchor bars or steel cables. The length of the anchor bars is greater than or equal to 35d. The length of the steel cables should be sufficient to ensure the intended anchoring effect. Furthermore, the embedded steel plate 50, connecting cover plate 60, and fasteners 70 need to be rust-proofed. The fasteners 70 are double-ended bolts and nuts, connecting pins, or rivets, etc. Preferably, the fasteners 70 include torque-shear type high-strength bolts and nuts.

[0047] Reference Figure 4 As shown, multiple sets of embedded steel plates 50, connecting cover plates 60 and fasteners 70 are arranged at intervals along the width direction of the connection end of the precast concrete floor slab 10.

[0048] The present invention provides a precast floor structure in which connecting cover plates 60 on the upper and lower sides and embedded steel plates 50 clamp the ends of the precast concrete floor slab 10 in the middle, so that the two butt-jointed precast concrete floor slabs 10 form an integral structure. The connecting cover plates 60 can coordinate the deformation of the two adjacent precast concrete floor slabs 10, and at the same time provide bending and shear stiffness, thereby greatly increasing the shear stiffness and load-bearing capacity at the joint. It has the characteristics of simple structure, convenient and quick construction, which can greatly shorten the construction period and facilitate subsequent partial replacement and replacement.

[0049] Example 2

[0050] Reference Figure 5 As shown, the connecting ends of the precast concrete floor slab 10 are provided with grooves 13. The number of grooves 13 can be set according to design needs, and a set spacing is maintained between the grooves 13.

[0051] Specifically, the toothed groove 13 is set between two adjacent embedded steel plates 50.

[0052] In this embodiment, a connecting steel plate 30 is provided inside the toothed groove 13. The connecting steel plate 30 is pre-installed on the end face of the precast concrete floor slab 10.

[0053] Reference Figure 6 As shown, the bottom of the connecting steel plate 30 is provided with a downwardly protruding snap-fit ​​part 31. The connecting end of the precast concrete floor slab 10 overlaps with the steel beam 20, as shown in the figure. Figure 7 As shown, the steel beam 20 includes an upper flange plate 21, a web plate 22, and a lower flange plate 23; the upper flange plate 21 is provided with a connecting hole 21a; the end of the precast concrete floor slab 10 overlaps the upper flange plate 21, and the snap-fit ​​part 31 is inserted into the connecting hole 21a. Furthermore, a plurality of studs 24 are welded and fixed at intervals on the upper flange plate 21.

[0054] The precast concrete floor slab 10 has a pre-embedded connecting short plate 40, which is generally parallel to the connecting steel plate 30. One side of the connecting short plate 40 is fixedly connected to the continuous reinforcing bar 11 in the precast concrete floor slab 10, and the other side of the connecting short plate 40 is connected to the connecting steel plate 30 through intermediate connecting parts 12 such as connecting blocks and connecting rods.

[0055] Furthermore, the connecting steel plate 30 is provided with rebar holes 35 and concrete tenon holes 32; when two adjacent precast concrete floor slabs 10 are joined, the two connecting steel plates 30 on the two precast concrete floor slabs 10 are arranged opposite each other, and bolts 33 are passed through the rebar holes 35 on the two connecting steel plates 30, and nuts 34 are tightened at both ends of the bolts 33 to fix the two precast concrete floor slabs 10 together. In this embodiment, the concrete tenon holes 32 are set at the center of the connecting steel plate 30, and multiple rebar holes 35 can be provided as needed.

[0056] The connecting steel plate 30 is parallel to and spaced apart from the end face of the precast concrete floor slab 10. The spacing allows for an effective insertion length for sheared steel bars or bolts inserted into the steel bar holes 35, thereby ensuring the necessary connection strength. At the same time, it provides necessary operating space for tightening nuts within the spacing when the floor slabs are joined.

[0057] Preferably, based on the above technical solution, a limiting plate 25 is provided at the bottom of the upper flange plate 21; the limiting plate 25 and the snap-fit ​​part 31 are arranged in parallel, and through holes are respectively provided on the limiting plate 25 and the snap-fit ​​part 31; the limiting plate 25 and the snap-fit ​​part 31 are connected by inserting a pin 26 into the through hole, thereby effectively preventing the precast concrete floor slab 10 and the steel beam 20 from completely separating.

[0058] Preferably, based on the above technical solution, a predetermined gap is left between the connecting hole 21a on the upper flange plate 21 and the snap-fit ​​part 31, so that the precast concrete floor slab 10 can slide relative to the steel beam 20. The predetermined gap is preferably filled with an elastic material such as a rubber strip.

[0059] The present invention enables rapid installation of precast concrete floor slabs 10 and steel beams 20 by setting pre-installed connecting steel plates 30, which reduces the workload, increases efficiency, and makes the connection structure more robust after installation.

[0060] Preferably, based on the above technical solution, referring to Figure 8 As shown, the through hole of the snap-fit ​​part 31 is a vertically elongated hole 31a provided along the height direction; refer to Figure 9 As shown, the through hole on the limiting plate 25 is a horizontal elongated hole 25a arranged in the horizontal direction; the pin can be slidably inserted into the vertical elongated hole 31a and the horizontal elongated hole 25a. The set lengths of the vertical elongated hole 31a and the horizontal elongated hole 25a respectively limit the relative range of movement of the precast concrete floor slab 10 relative to the steel beam 20 in the height and floor slab width directions, so as to avoid destructive damage to the precast concrete floor slab 10 and the steel beam 20 when the building vibrates or shakes.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A precast floor structure, characterized in that, include: Precast concrete floor slabs, embedded steel plates, connecting cover plates, and fasteners; The embedded steel plate includes an upper embedded steel plate and a lower embedded steel plate; The top and bottom surfaces of the connecting end of the precast concrete floor slab are respectively provided with an upper embedded steel plate and a lower embedded steel plate; and the connecting end of the precast concrete floor slab is provided with a through hole that passes through the upper and lower parts of the connecting end as well as the upper and lower embedded steel plates. The connecting cover plate has through holes at both ends; When two precast concrete floor slabs are joined together, the two ends of the upper and lower connecting cover plates are respectively attached to the upper and lower embedded steel plates; the fasteners pass through the through holes and via holes to connect and fix the two precast concrete floor slabs. The precast concrete floor slabs are provided with toothed grooves at the connecting ends; the toothed grooves are located between two adjacent embedded steel plates; and connecting steel plates are installed inside the toothed grooves. The bottom of the connecting steel plate is provided with a downwardly protruding snap-fit ​​part; the connecting end of the precast concrete floor slab overlaps on the steel beam, and the upper flange plate of the steel beam is provided with a connection hole; the end of the precast concrete floor slab overlaps on the upper flange plate, and the snap-fit ​​part is inserted into the connection hole; The connecting steel plates are provided with rebar holes and concrete tenon holes; when two adjacent precast concrete floor slabs are joined together, the two connecting steel plates on the two precast concrete floor slabs are arranged opposite each other, and bolts are passed through the rebar holes on the two connecting steel plates. Nuts are tightened at both ends of the bolts to fix the two precast concrete floor slabs together. A limiting plate is provided at the bottom of the upper flange plate; the limiting plate and the snap-fit ​​part are arranged parallel to each other, and through holes are respectively provided on the limiting plate and the snap-fit ​​part; the limiting plate and the snap-fit ​​part are connected by inserting a pin into the through hole; The through hole of the snap-fit ​​part is a vertical elongated hole set along the height direction; the through hole of the limiting plate is a horizontal elongated hole set along the horizontal direction; the pin can be slidably inserted into the vertical elongated hole and the horizontal elongated hole.

2. The precast floor structure according to claim 1, characterized in that, The top surface of the connection end of the precast concrete floor slab is provided with an upper sinking platform for receiving the upper connecting cover plate, and the upper embedded steel plate is the platform surface of the sinking platform.

3. The precast floor structure according to claim 2, characterized in that, After the upper connecting cover plate is attached to the upper embedded steel plate, the top surface of the lower connecting cover plate is recessed into the upper sinking platform.

4. The precast floor structure according to claim 1, characterized in that, The bottom surface of the connection end of the precast concrete floor slab is provided with a sunken platform for receiving the connecting cover plate below, and the lower embedded steel plate is the platform surface of the sunken platform.

5. The precast floor slab structure according to claim 4, characterized in that, After the connecting cover plate is attached to the lower embedded steel plate, the bottom surface of the lower connecting cover plate is recessed into the sunken platform.

6. The precast floor structure according to claim 1, characterized in that, It also includes embedded parts, one end of which is embedded in the precast concrete floor slab, and the other end of which extends out of the precast concrete floor slab and is fixedly connected to the embedded steel plate.

7. The precast floor structure according to claim 6, characterized in that, In the precast concrete floor slab, the embedded parts are arranged longitudinally, and the embedded parts are arranged alternately with the transverse reinforcing bars.

8. The precast floor structure according to claim 1, characterized in that, The fasteners are double-ended bolts and nuts, connecting pins, or rivets.

9. The precast floor structure according to claim 6, characterized in that, The embedded parts are anchor bars or steel cables.

10. The precast floor structure according to claim 1, characterized in that, In the width direction of the connection end of the precast concrete floor slab, multiple sets of the embedded steel plates, connecting cover plates and fasteners are arranged at intervals.

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