One-way composite floor slab
By using a pre-assembled steel reinforcement assembly connection structure in unidirectional composite floor slabs, the problem of high cost of handling gaps between adjacent precast base slabs was solved, achieving efficient construction and improved structural integrity, and extending service life.
Patent Information
- Application Number
- CN202522607187.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-09
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-12-09
AI Technical Summary
Existing measures for handling gaps between adjacent precast base slabs in unidirectional composite floor slabs are costly, affect construction efficiency and forming quality, and make it difficult to guarantee the load-bearing capacity and service life of the overall structure.
The connection structure adopts pre-assembled steel reinforcement components, including lapped steel bars, connecting bars and additional bent bars, which are prefabricated into an integral structure and placed directly at the joint space. The steel mesh is then tied on site to achieve stress transfer and overall reinforcement.
It improves construction efficiency and quality, reduces costs, enhances the shear strength of the joint space, extends the service life of unidirectional composite floor slabs, and avoids quality problems such as cracks.
Smart Images
Figure CN223781035U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of prefabricated building technology, specifically to a unidirectional composite floor slab. Background Technology
[0002] One-way composite floor slabs are mainly composed of a precast bottom slab and an upper post-cast concrete composite layer. The precast bottom slab is equipped with a steel reinforcement structure that can be located in the concrete composite layer. During the construction stage, the precast bottom slab serves as the formwork for the post-cast concrete composite layer to bear the load. After the post-cast concrete reaches the design strength, the two form an integral whole to share the load.
[0003] When installing precast base slabs of unidirectional composite floor slabs, gaps are usually reserved between adjacent precast base slabs to avoid splicing failures due to dimensional errors during transportation and installation. To ensure the integrity of the unidirectional composite floor slab, slots are usually set on the side of the precast base slab for snap-fit or the gaps are filled with post-cast concrete. However, setting slots on the precast base slab increases the preparation cost of the precast base slab, and the slots are easily damaged during transportation, increasing transportation costs. Directly filling the gaps with post-cast concrete cannot ensure the load-bearing capacity of the floor slab at the gaps and is prone to cracking. If additional steel bars are laid in the gaps and overlapped to the two adjacent precast base slabs using existing technology, it will easily increase on-site construction time, and cannot guarantee the uniformity of steel bar laying and structural integrity, affecting the forming quality and service life of the unidirectional composite floor slab. Utility Model Content
[0004] The purpose of this utility model is to overcome the shortcomings of existing unidirectional composite floor slabs, such as the high cost of handling gaps between adjacent precast base plates, which affects construction efficiency and forming quality, and to provide a unidirectional composite floor slab.
[0005] This utility model provides a unidirectional composite floor slab, comprising:
[0006] The prefabricated layer includes prefabricated base plates spaced apart, with joint spaces formed between adjacent prefabricated base plates;
[0007] Post-cast layer, which covers the precast layer and fills the joint space;
[0008] The connecting structure includes pre-assembled steel reinforcement components, which can connect the on-site tied steel mesh in the post-cast layer, overlap the adjacent precast base plate, and partially extend into the joint space.
[0009] Preferably, the connection structure includes a plurality of lapped reinforcing bars arranged at intervals, the lapped reinforcing bars overlapping the top surface of adjacent precast base slabs, and a plurality of connecting bars provided on the lapped reinforcing bars, the connecting bars being parallel to the precast base slabs. The plurality of lapped reinforcing bars are connected to additional bent bars, one end of which is located in the joint space, and the other end is connected to the on-site tied reinforcing mesh within the post-cast layer. This allows the lapped reinforcing bars to form a mesh structure through the connecting bars, facilitating overall movement and use. The connection between the connecting bars and the lapped reinforcing bars further improves the overall integrity of the connection structure.
[0010] Preferably, the connecting reinforcement includes a first longitudinal reinforcement and a second longitudinal reinforcement arranged in parallel, with the first and second longitudinal reinforcements respectively located on both sides of the joint space. This ensures that the connecting structure is stable and bears force smoothly at the joint space, effectively transmitting the load.
[0011] Preferably, each of the lapped reinforcing bars is connected to the additional bent reinforcing bar.
[0012] Preferably, the lapped reinforcing bars spaced apart are connected to the additional bent reinforcing bars.
[0013] Preferably, the additional bent reinforcement includes a first hook portion and a second hook portion. The first hook portion is connected to the on-site tied steel mesh in the post-cast layer, and the second hook portion is located within the joint space. The provision of the first hook portion and the second hook portion can extend the length of the additional bent reinforcement, expand the force transmission range, further improve the overall structural integrity, and enhance the performance.
[0014] Preferably, a third longitudinal rib is provided within the second hook portion, and the first, second, and third longitudinal ribs are longitudinally continuous along the joint space. The third longitudinal rib enables effective transfer of force between adjacent additional bent ribs.
[0015] Preferably, the first hook portion and the second hook portion face the same side of the seam space.
[0016] Preferably, the connecting bar is welded or tied to the lapped bar, and the additional bent bar is welded or tied to the lapped bar.
[0017] Preferably, the lapped reinforcing bars extend at least within the projection range of the pre-reserved protruding reinforcing bars on the precast base slab. This further improves the overall integrity of the floor slab and ensures effective force transmission.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] 1. This utility model provides a unidirectional composite floor slab. By adopting a connection structure of steel pre-assembled components that can be prefabricated into an integral structure, it can be directly placed in the joint space during use. The quality of the prefabricated connection structure is easy to unify, and the on-site installation efficiency is high, which can improve construction efficiency and quality and reduce construction costs.
[0020] 2. This utility model provides a unidirectional composite floor slab, which realizes the connection between the on-site tied steel mesh in the post-cast layer and the post-cast material in the joint space through the connection structure of the pre-assembled steel reinforcement components. This enables the effective transfer of force in the joint space, improves the shear strength of the structure in the joint space, thereby improving the integrity of the unidirectional composite floor slab, extending its service life, and effectively avoiding quality problems such as cracks. Attached Figure Description
[0021] Figure 1 This is a structural schematic diagram of a unidirectional composite floor slab (before the post-cast layer is poured) in Example 1.
[0022] Figure 2 This is a schematic diagram of the connection structure described in Example 1.
[0023] Figure 3 This is a structural schematic diagram of a unidirectional composite floor slab (after the post-cast layer is poured) in Example 1.
[0024] Marked in the image:
[0025] 1-Precast layer, 11-Precast base slab, 111-Reserved protruding steel bar, 2-Joint space, 3-Post-cast layer, 31-On-site tied steel mesh, 4-Connecting structure, 41-Lap steel bar, 42-Connecting bar, 421-First longitudinal bar, 422-Second longitudinal bar, 423-Third longitudinal bar, 5-Additional bent bar, 51-First hook part, 52-Second hook part. Detailed Implementation
[0026] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.
[0027] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer" used in the description of specific embodiments of this utility model to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.
[0028] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.
[0029] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.
[0030] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.
[0031] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.
[0032] Example 1
[0033] like Figures 1-3 As shown, a unidirectional composite floor slab includes a precast layer 1, a post-cast layer 3, and a connecting structure 4. The precast layer 1 includes precast base plates 11 spaced apart, with a joint space 2 formed between adjacent precast base plates 11. The post-cast layer 3 covers the precast layer 1 and fills the joint space 2. The connecting structure 4 includes pre-assembled steel reinforcement components. The connecting structure 4 can connect the on-site tied steel mesh 31 in the post-cast layer 3, overlap adjacent precast base plates 11, and partially extend into the joint space 2.
[0034] In an optional embodiment, the connecting structure 4 includes a plurality of lapped steel bars 41 arranged at intervals. The lapped steel bars 41 overlap the top surface of the adjacent precast base plate 11. A plurality of connecting bars 42 are provided on the lapped steel bars 41. The connecting bars 42 are parallel to the precast base plate 11. The plurality of lapped steel bars 41 are connected to additional bent bars 5. One end of the additional bent bars 5 is located in the joint space 2, and the other end is connected to the on-site tied steel mesh 31 in the post-cast layer 3.
[0035] Specifically, the lapped reinforcing bars 41, connecting bars 42, and additional bent bars 5 are all steel reinforcement components. The lapped reinforcing bars 41 and connecting bars 42 can be straight bars, and the additional bent bars 5 can be bent bars. The lapped reinforcing bars 41, connecting bars 42, and additional bent bars 5 are prepared separately in advance and then assembled into a whole connection structure 4. Among them, the lapped reinforcing bars 41 are used to realize the horizontal connection of adjacent precast base slabs 11, and the connecting bars 42 are used to connect all the lapped reinforcing bars 41 together to form a mesh structure, so that the force of adjacent precast base slabs 11 can be transferred horizontally to each other along the lapped reinforcing bars 41 and connecting bars 42, realizing the effective force transmission in the horizontal and vertical directions within the horizontal plane of the unidirectional composite floor slab. The additional bent bars 5 are used to realize the vertical connection between the post-cast layer 3 and the precast layer 1, so that the upper and lower layers can have the force transmission capacity and improve the shear resistance of the post-cast layer 3 at the joint space 2. Through the combination of lapped reinforcing bars 41 and additional bent bars 5, the load-bearing capacity at the joint space 2 can be effectively improved, the integrity of the unidirectional composite floor slab can be improved, and its service life can be increased.
[0036] In an optional embodiment, the connecting bar 42 may include a first longitudinal bar 421 and a second longitudinal bar 422 arranged in parallel, with the first longitudinal bar 421 and the second longitudinal bar 422 respectively located on both sides of the joint space 2. The connecting bar 42 is used to connect multiple lapped reinforcing bars 41.
[0037] In an optional embodiment, the length of the connecting rib 42 can be the same as the length of one or more precast base plates 11. When the length of the connecting rib 42 is the same as the length of a single precast base plate 11, the adjacent precast base plates 11 can be effectively connected. When the length of the connecting rib 42 is the same as the length of multiple precast base plates 11, the multiple precast base plates 11 can be connected to transmit force simultaneously, thereby further improving the integrity of the unidirectional composite floor slab formed by the precast base plates 11.
[0038] In an optional embodiment, each lapped reinforcing bar 41 is connected to an additional bent bar 5. The number of additional bent bars 5 is consistent with the number of lapped reinforcing bars 41, thereby strengthening the structure at the location of each lapped reinforcing bar 41.
[0039] In an optional embodiment, the lapped reinforcing bars 41 arranged at intervals are respectively connected to the additional bent bars 5. This allows the number of additional bent bars 5 to be appropriately reduced, thereby reducing the overall construction cost.
[0040] In an optional embodiment, the additional bent bar 5 includes a first hook portion 51 and a second hook portion 52. The first hook portion 51 is connected to the on-site tied steel mesh 31 in the post-cast layer 3, and the second hook portion 52 is located within the joint space 2. The first hook portion 51 and the second hook portion 52 extend the length of the additional bent bar 5 in the post-cast material, enabling resistance and transmission of forces in different directions, improving the quality of the formed floor slab. Furthermore, the connection between the additional bent bar 5 and the on-site tied steel mesh 31 in the post-cast layer 3 further enhances the integrity of the reinforcing steel, facilitating effective force transmission in the floor slab, thereby further improving the structural integrity of the floor slab and extending its service life.
[0041] In an optional embodiment, a third longitudinal rib 423 is provided within the second hook portion 52, and the first longitudinal rib 421, the second longitudinal rib 422, and the third longitudinal rib 423 are arranged longitudinally along the joint space 2. This allows for the connection of multiple additional bent ribs 5 via the third longitudinal rib 423, further increasing the force transmission path. Furthermore, the third longitudinal rib 423 is directly located within the second hook portion 52, ensuring a stable arrangement.
[0042] In an optional embodiment, the first hook portion 51 and the second hook portion 52 face the same side of the joint space 2. This facilitates the preparation of the additional bending rib 5 and promotes structural consistency.
[0043] In an optional embodiment, the connecting bar 42 is welded or tied to the lapped bar 41, and the additional bent bar 5 is welded or tied to the lapped bar 41. Either tying or welding can be used to achieve the integral forming of the connecting structure 4, improving manufacturing flexibility.
[0044] In an optional embodiment, the lapped reinforcing bars 41 extend at least within the projection range of the precast raised reinforcing bars 111 on the precast base slab 11. The precast base slab 11 typically has raised reinforcing bars 111 precast on the side closest to the post-cast layer 3 to improve the overall connection with the post-cast layer 3. By extending the lapped reinforcing bars 41 within the projection range of the raised reinforcing bars, the force transmission effectiveness of the formed floor slab can be improved, thereby extending the service life of the floor slab.
[0045] This embodiment of a unidirectional composite floor slab employs a pre-assembled steel reinforcement assembly connection structure 4, which can be prefabricated into an integral structure. During use, it can be directly placed as a whole at the joint space 2. The prefabricated connection structure 4 ensures consistent quality and high on-site installation efficiency, improving construction efficiency and quality while reducing construction costs. Simultaneously, the connection structure 4, through which the on-site tied steel reinforcement mesh 31 within the post-cast layer 3 is connected to the post-cast material within the joint space 2, enables effective force transfer at the joint space 2, improving the shear strength of the joint space 2 structure. This, in turn, enhances the overall integrity of the unidirectional composite floor slab, extends its service life, and effectively prevents quality problems such as cracks.
[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A unidirectional composite floor slab, characterized in that, include: The prefabricated layer (1) includes prefabricated base plates (11) spaced apart, and a joint space (2) is formed between adjacent prefabricated base plates (11); Post-cast layer (3), which covers the precast layer (1) and fills the joint space (2); The connecting structure (4) includes a pre-assembled steel reinforcement assembly. The connecting structure (4) is capable of connecting the on-site tied steel reinforcement mesh (31) in the post-cast layer (3), overlapping the adjacent precast base plate (11), and partially extending into the joint space (2).
2. The unidirectional composite floor slab according to claim 1, characterized in that, The connection structure (4) includes several lapped steel bars (41) arranged at intervals. The lapped steel bars (41) overlap the top surface of the adjacent precast base plate (11). Several connecting bars (42) are provided on the lapped steel bars (41). The connecting bars (42) are parallel to the precast base plate (11). Several lapped steel bars (41) are connected to additional bent bars (5). One end of the additional bent bars (5) is located in the joint space (2), and the other end is connected to the on-site tied steel mesh (31) in the post-cast layer (3).
3. A unidirectional composite floor slab according to claim 2, characterized in that, The connecting bar (42) includes a first longitudinal bar (421) and a second longitudinal bar (422) arranged in parallel, with the first longitudinal bar (421) and the second longitudinal bar (422) respectively located on both sides of the joint space (2).
4. A unidirectional composite floor slab according to claim 3, characterized in that, Each of the lapped reinforcing bars (41) is connected to the additional bent bars (5).
5. A unidirectional composite floor slab according to claim 3, characterized in that, The lapped steel bars (41) arranged at intervals are respectively connected to the additional bent bars (5).
6. A unidirectional composite floor slab according to claim 3, characterized in that, The additional bent bar (5) includes a first hook portion (51) and a second hook portion (52). The first hook portion (51) is connected to the on-site tied steel mesh (31) in the post-cast layer (3), and the second hook portion (52) is located in the joint space (2).
7. A unidirectional composite floor slab according to claim 6, characterized in that, The second hook portion (52) is provided with a third longitudinal rib (423), and the first longitudinal rib (421), the second longitudinal rib (422) and the third longitudinal rib (423) are arranged longitudinally along the joint space (2).
8. A unidirectional composite floor slab according to claim 6, characterized in that, The first hook portion (51) and the second hook portion (52) face the same side of the seam space (2).
9. A unidirectional composite floor slab according to claim 2, characterized in that, The connecting bar (42) is welded or tied to the lapped bar (41), and the additional bent bar (5) is welded or tied to the lapped bar (41).
10. A unidirectional composite floor slab according to claim 9, characterized in that, The lapped reinforcing bars (41) extend at least within the projection range of the pre-reserved protruding reinforcing bars (111) on the precast base plate (11).