T-shaped rib light-weight laminated slab

Abstract

The utility model provides a kind of T rib light type laminated slab, including prefabricated slab and cast-in-place concrete laminated layer being covered on prefabricated slab, several interval distribution inverted T ribs are equipped on the prefabricated slab, inverted T rib and adjacent inverted T rib form swallow-tailed shape through groove, and the through groove is installed with the matching weight-reducing core material of swallow-tailed shape through groove.Inverted T rib is distributed along the longitudinal length of prefabricated slab, the shape of inverted T rib cross section is upper wide lower narrow trapezoid, and the included angle α of the waist of trapezoid and the bottom flange of prefabricated slab is not less than 60 °.The utility model greatly reduces the dead weight of laminated slab, is convenient for transportation and installation, also reduces the load of structure component such as beam, column, foundation connected therewith, and the overall structure cost can be further reduced.

Description

Technical Field

[0001] This utility model relates to the field of prestressed concrete precast components, and in particular to a T-rib lightweight composite slab. Background Technology

[0002] Traditional cast-in-place floor slabs require on-site formwork, a process that is extremely time-consuming and significantly reduces construction efficiency. Furthermore, the on-site formwork process and subsequent construction phases inevitably cause serious environmental pollution. The generation of large amounts of construction waste, dust pollution, and noise pollution negatively impacts the living environment of nearby residents. In addition, the construction cycle for traditional cast-in-place floor slabs is lengthy; each step, from formwork and pouring to curing, requires substantial time. This becomes a key factor restricting the overall progress of projects with strict schedule requirements.

[0003] Given the numerous drawbacks of traditional cast-in-place floor slabs, composite slab technology has emerged and gained widespread application. A composite slab is a precast monolithic floor slab composed of a lower precast slab and an upper cast-in-place reinforced concrete layer. This combination method, to a certain extent, balances the efficiency of precast components with the integrity of cast-in-place structures. Currently, commonly used composite slab technologies mainly include truss-reinforced composite slabs, PK slabs, and multi-ribbed slabs. However, they have all revealed some limitations in practical applications, as follows:

[0004] 1. Truss-reinforced composite slabs have relatively low load-bearing capacity, meaning they are only suitable for building structures with small spans and low load requirements. In some large-span, high-load building projects, truss-reinforced composite slabs are unlikely to meet the requirements. Furthermore, the internal truss reinforcement presents numerous difficulties when installing pipelines, causing inconvenience for subsequent work such as equipment installation. In addition, the protruding reinforcing bars are highly susceptible to collision deformation during transportation and hoisting. Deformation of these bars not only affects the connection quality with the upper cast-in-place layer but may also hinder construction progress, increase construction quality risks, and require additional time and manpower for repairs.

[0005] 2. The structural feature of PK panels is the presence of T-shaped ribs with pre-drilled rectangular holes. While this design reduces the panel's weight to some extent, it also introduces complex molds. The complex mold-making process not only increases production costs but also demands extremely high precision and craftsmanship. Even slight errors can easily lead to quality problems, resulting in PK panels that do not meet design requirements, thus affecting the overall construction quality and schedule of the floor slab.

[0006] 3. The ribs of a multi-ribbed slab break at the supports, which are the sections with the greatest shear force. Since the thin slab bears the load alone, it may not be able to meet the load-bearing requirements under large shear forces, posing a certain structural safety hazard. Multi-ribbed slabs use ordinary steel reinforcement technology, resulting in relatively low load-bearing capacity and a relatively small span without supports, limiting their application in large-span or high-load buildings. Furthermore, the protruding bottom ribs of multi-ribbed slabs reduce the usable height of the building, which is disadvantageous for buildings with high space utilization requirements. In addition, the protruding ribs also make it difficult to lay pipelines perpendicular to the rib direction, hindering the layout and installation of internal equipment pipelines.

[0007] In conclusion, although composite slab technology represents a significant advancement over traditional cast-in-place slabs, several commonly used composite slab technologies still have limitations and cannot meet the diverse requirements of modern architecture in terms of efficiency, environmental protection, safety, and applicability. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this utility model provides a T-rib lightweight composite slab. A dovetail-shaped through-groove is formed between the inverted T-rib and the cast-in-place concrete composite layer. A weight-reducing core material matching the dovetail-shaped through-groove is installed in the through-groove, which greatly reduces the self-weight of the composite slab, making it easier to transport and install. It also reduces the load on connected structural components such as beams, columns, and foundations, which can further reduce the overall structural cost.

[0009] This utility model achieves the above-mentioned technical objectives through the following technical means.

[0010] A T-rib lightweight composite slab includes a precast slab and a cast-in-place concrete composite layer covering the precast slab. The precast slab is provided with a plurality of inverted T-ribs distributed at intervals. A dovetail-shaped through groove is formed between the inverted T-ribs and adjacent inverted T-ribs. A weight-reducing core material matching the dovetail-shaped through groove is installed in the through groove.

[0011] Furthermore, the weight-reducing core material is distributed longitudinally in the through groove, and the two ends of the through groove are not filled with core material, which is part of the cast-in-place concrete composite layer.

[0012] Furthermore, the inverted T-ribs are distributed along the longitudinal length of the precast slab, and the cross-sectional shape of the inverted T-ribs is a trapezoid that is wider at the top and narrower at the bottom. The angle α between the waist of the trapezoid and the bottom flange of the precast slab is not less than 60°.

[0013] Furthermore, the precast slab is provided with a reinforcing structure that exposes the precast slab, and the reinforcing structure extends into the cast-in-place concrete composite layer.

[0014] Furthermore, the reinforcing structure includes vertical steel mesh, with a vertical steel mesh provided in each of the inverted T-ribs. One end of the vertical steel mesh extends to the internal steel reinforcement of the precast slab, and the other end of the vertical steel mesh protrudes from the top surface of the precast slab and extends into the cast-in-place concrete composite layer.

[0015] Furthermore, the reinforcing structure also includes a transverse steel mesh, which is perpendicular to the vertical steel mesh. The transverse steel mesh passes through several dovetail-shaped slots or is located at the end of the dovetail-shaped slots. One end of the transverse steel mesh extends to the internal steel reinforcement of the precast slab, and the other end of the transverse steel mesh protrudes from the top surface of the precast slab and extends into the cast-in-place concrete composite layer.

[0016] Furthermore, the internal reinforcement of the precast slab includes prestressed steel bars and transverse distribution bars. The bottom flange of the precast slab is provided with a number of longitudinally prestressed steel bars and a number of transversely distributed bars.

[0017] Furthermore, transverse crack-resistant steel bars are provided at both anchoring ends of the precast slab.

[0018] Furthermore, the inverted T-ribs along the longitudinal direction are provided with outward shear-resistant structures at both ends for supporting the placement of the composite plates.

[0019] Furthermore, the shear-resistant structure includes shear-resistant steel plates and connectors. Both ends of the inverted T-rib are provided with outward-extending shear-resistant steel plates, and both sides of one end of the shear-resistant steel plate are fixed inside the inverted T-rib by connectors.

[0020] Furthermore, the connector consists of several groups of L-shaped steel bars distributed longitudinally and short longitudinal bars connecting each group of L-shaped steel bars.

[0021] Furthermore, the weight-reducing core material is made of EPS board or XPS board, and the cross-section of the weight-reducing core material matches the dovetail-shaped through groove.

[0022] The beneficial effects of this utility model are as follows:

[0023] 1. The T-rib lightweight composite slab of this utility model forms a dovetail-shaped through groove between the inverted T-rib and the cast-in-place concrete composite layer. A weight-reducing core material matching the dovetail-shaped through groove is installed in the through groove, which greatly reduces the self-weight of the composite slab, facilitates transportation and installation, and reduces the load on the connected beams, columns, foundations and other structural components, thereby reducing the overall structural cost.

[0024] 2. The T-rib lightweight composite slab of this utility model combines prestressed pretensioning process with prefabricated rib structure, which effectively increases the load-bearing capacity of the composite slab while reducing steel consumption and lowering overall cost.

[0025] 3. The T-rib lightweight composite slab of this utility model has prestressed steel bars and transverse distribution bars inside the precast slab. With the help of prestressing technology, it can achieve a high load-bearing capacity, thereby expanding the application range of the composite slab and making it applicable to slab spans or slab load ranges with larger spans or larger loads.

[0026] 4. The T-rib lightweight composite slab of this utility model has an inverted T-rib with a cross-sectional shape that is wider at the top and narrower at the bottom, and the angle α between the waist of the trapezoid and the bottom flange of the precast slab is not less than 60°. This can effectively position and reduce the weight of the core material, prevent the core material from floating during on-site casting of the composite layer, and ensure the stability and quality of the structure.

[0027] 5. The T-rib lightweight composite slab of this utility model has an outward shear-resistant structure at both ends of the inverted T-ribs along the longitudinal direction, which can be directly placed on the supporting members without the need for temporary brackets or grooves, simplifying the construction process and improving construction efficiency.

[0028] 6. The T-rib lightweight composite slab of this utility model has a reinforcing structure exposed on the precast slab. The reinforcing structure extends into the cast-in-place concrete composite layer to effectively enhance the bonding ability of the composite surface, further improve the overall integrity of the composite slab, and improve its performance during use.

[0029] 7. The T-rib lightweight composite slab of this utility model has the weight-reducing core material distributed longitudinally in the through groove, and the two ends of the through groove are not filled with core material. It is part of the cast-in-place concrete composite layer, which can effectively bear the large shear force at the support and enhance the load-bearing capacity of the structure in key parts.

[0030] 8. The T-rib lightweight composite slab of this utility model has a precast slab cross-section that is a solid flat plate with several inverted T-ribs, which facilitates later decoration and improves the convenience and flexibility of construction. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of this utility model. For those skilled in the art, it is obvious that other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a front view of the T-rib lightweight composite plate described in this utility model.

[0033] Figure 2 for Figure 1 AA sectional view.

[0034] Figure 3 for Figure 1BB cross-sectional view.

[0035] Figure 4 for Figure 2 CC section view.

[0036] Figure 5 for Figure 2 DD sectional view.

[0037] Figure 6 This is a partially enlarged schematic diagram of the shear-resistant structure described in this utility model.

[0038] In the picture:

[0039] 1-Precast slab; 1-1-Prestressed steel bars; 1-2-Transverse distribution bars; 1-3-Transverse crack-resistant bars; 1-4-Inverted T-ribs; 2-Weight-reducing core material; 3-Cast-in-place concrete composite layer; 4-Vertical steel mesh; 5-Transverse steel mesh; 6-Vertical steel mesh; 7-Shear steel plate; 8-Connectors; 8-1-L-shaped steel bars; 8-2-Short longitudinal bars. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 utility model according to the specific circumstances.

[0043] like Figure 1 and Figure 2 As shown, the T-rib lightweight composite slab of this utility model includes a precast slab 1 and a cast-in-place concrete composite layer 3 covering the precast slab 1. The precast slab 1 has several spaced-apart inverted T-ribs 1-4, forming dovetail-shaped through-grooves between the inverted T-ribs 1-4 and the cast-in-place concrete composite layer 3. A weight-reducing core material 2, matching the dovetail-shaped through-grooves, is installed within the through-grooves; that is, the cross-section of the weight-reducing core material 2 is similar to the dovetail-shaped through-grooves. This significantly reduces the self-weight of the composite slab, facilitating transportation and installation, and thus reducing the load on connected structural components such as beams, columns, and foundations, thereby lowering the overall structural cost. Furthermore, the dovetail-shaped through-grooves effectively position the weight-reducing core material 2, preventing it from floating during the pouring of the cast-in-place concrete composite layer 3, ensuring the stability and quality of the structure.

[0044] like Figure 2 and Figure 6 As shown, the inverted T-ribs 1-4 are distributed along the longitudinal direction of the precast slab 1. The cross-sectional shape of the inverted T-ribs 1-4 is a trapezoid that is wider at the top and narrower at the bottom. The angle α between the waist of the trapezoid and the bottom flange of the precast slab 1 is not less than 60°, which facilitates demolding. In the embodiment, the cross-sectional shape of the middle inverted T-rib 1-4 is an isosceles trapezoid that is wider at the top and narrower at the bottom, while the cross-sectional shape of the inverted T-ribs 1-4 on both sides of the precast slab 1 is a trapezoid that is wider at the top and narrower at the bottom.

[0045] like Figure 2 and Figure 3As shown, the precast slab 1 is provided with a reinforcing structure that protrudes from the precast slab 1. The reinforcing structure extends into the cast-in-place concrete composite layer 3, effectively enhancing the bonding ability of the composite surface, further improving the overall integrity of the composite slab, and improving its performance during use. In some embodiments, the reinforcing structure includes a vertical steel mesh 4. A vertical steel mesh 4 is provided in each of the inverted T-ribs 1-4. One end of the vertical steel mesh 4 extends to the internal steel reinforcement of the precast slab 1, and the other end of the vertical steel mesh 4 protrudes from the top surface of the precast slab 1 and extends into the cast-in-place concrete composite layer 3. In other embodiments, the reinforcing structure, in addition to the vertical steel mesh 4, also includes a horizontal steel mesh 5. The horizontal steel mesh 5 is perpendicular to the vertical steel mesh 4 and passes laterally through several dovetail-shaped through slots or is located at the end of the dovetail-shaped through slots. One end of the horizontal steel mesh 5 extends to the internal steel reinforcement of the precast slab 1, and the other end of the horizontal steel mesh 5 protrudes from the top surface of the precast slab 1 and extends into the cast-in-place concrete composite layer 3.

[0046] like Figure 2 and Figure 3 As shown, the internal reinforcement of the precast slab 1 includes prestressed steel bars 1-1 and transverse distribution bars 1-2. The bottom flange of the precast slab 1 has several longitudinally arranged prestressed steel bars 1-1, and the bottom flange of the precast slab 1 has several transversely distributed distribution bars 1-2. The precast slab 1, through prestressing technology, achieves higher load-bearing capacity, thereby expanding the applicability of composite slabs to accommodate larger spans or larger load ranges. The anchorage ends of the precast slab 1 are provided with transverse crack-resistant steel bars 1-3, such as... Figure 4 As shown. The precast slab 1 is formed by prestressing using the pre-tensioning method, and its cross-section is a solid flat plate with several inverted T-ribs 1-4.

[0047] Figure 5 and Figure 6 As shown, the inverted T-ribs 1-4 along the longitudinal direction have outward-extending shear-resistant structures at both ends for supporting the composite slab. The shear-resistant structure includes shear-resistant steel plates 7 and connectors 8. Both ends of the inverted T-ribs 1-4 have outward-extending shear-resistant steel plates 7, and both sides of one end of the shear-resistant steel plate 7 are fixed inside the inverted T-ribs 1-4 by connectors 8. The connectors 8 consist of several sets of longitudinally distributed L-shaped reinforcing bars 8-1 and short longitudinal bars 8-2 connecting each set of L-shaped reinforcing bars 8-1. The longitudinal length of the connectors 8 is basically the same as that of the shear-resistant steel plates 7. The shear-resistant structure can be directly placed on the supporting members without the need for temporary brackets or grooves, simplifying the construction process and improving construction efficiency.

[0048] In this embodiment, the weight-reducing core material 2 is an EPS board or an XPS board. The EPS board is an expandable polystyrene foam board, and the XPS board is an extruded polystyrene foam board.

[0049] The weight-reducing core material 2 is distributed longitudinally in the through groove, and there is no core material filling at both ends of the through groove. It is part of the cast-in-place concrete composite layer 3, which can effectively bear the large shear force at the support and enhance the load-bearing capacity of the structure in key parts.

[0050] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0051] The detailed descriptions listed above are merely specific descriptions of feasible embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. All equivalent embodiments or modifications made without departing from the spirit of the present utility model should be included within the scope of protection of the present utility model.

Claims

1. A T-rib lightweight composite panel, characterized in that, It includes a precast slab (1) and a cast-in-place concrete composite layer (3) covering the precast slab (1). The precast slab (1) is provided with a number of spaced-apart inverted T-ribs (1-4). The inverted T-ribs (1-4) and the adjacent inverted T-ribs form a dovetail-shaped through groove. A weight-reducing core material (2) matching the dovetail-shaped through groove is installed in the through groove.

2. The T-rib lightweight composite plate according to claim 1, characterized in that, The weight-reducing core material (2) is distributed longitudinally in the through groove, and there is no core material filling at both ends of the through groove, which is part of the cast-in-place concrete composite layer (3).

3. The T-rib lightweight composite plate according to claim 1, characterized in that, The inverted T-ribs (1-4) are distributed along the longitudinal direction of the precast slab (1). The cross-sectional shape of the inverted T-ribs (1-4) is a trapezoid with a wider top and a narrower bottom. The angle α between the waist of the trapezoid and the bottom flange of the precast slab (1) is not less than 60°.

4. The T-rib lightweight composite plate according to claim 1, characterized in that, The precast slab (1) is provided with a reinforcing structure that exposes the precast slab (1) and the reinforcing structure extends into the cast-in-place concrete composite layer (3).

5. The T-rib lightweight composite plate according to claim 4, characterized in that, The reinforcing structure includes a vertical steel mesh (4), and a vertical steel mesh (4) is provided in each of the inverted T-ribs (1-4). One end of the vertical steel mesh (4) extends to the steel reinforcement inside the precast slab (1), and the other end of the vertical steel mesh (4) protrudes from the top surface of the precast slab (1) and extends into the cast-in-place concrete composite layer (3).

6. The T-rib lightweight composite plate according to claim 5, characterized in that, The reinforcing structure also includes a transverse steel mesh (5), which is perpendicular to the vertical steel mesh (4). The transverse steel mesh (5) passes through several dovetail-shaped channels or is located at the end of the dovetail-shaped channels. One end of the transverse steel mesh (5) extends to the steel reinforcement inside the precast slab (1), and the other end of the transverse steel mesh (5) protrudes from the top surface of the precast slab (1) and extends into the cast-in-place concrete composite layer (3).

7. The T-rib lightweight composite plate according to claim 1, characterized in that, The internal reinforcement of the precast slab (1) includes prestressed steel bars (1-1) and transverse distribution bars (1-2). The bottom flange of the precast slab (1) is provided with a number of longitudinally arranged prestressed steel bars (1-1) and a number of transversely distributed bars (1-2) along the transverse direction.

8. The T-rib lightweight composite plate according to claim 1, characterized in that, The precast slab (1) is provided with transverse crack-resistant steel bars (1-3) on both sides of its anchorage end.

9. The T-rib lightweight composite plate according to claim 1, characterized in that, The inverted T-ribs (1-4) along the longitudinal direction have outward shear-resistant structures at both ends for supporting the placement of the composite slab.

10. The T-rib lightweight composite plate according to claim 9, characterized in that, The shear-resistant structure includes a shear-resistant steel plate (7) and a connector (8). Both ends of the inverted T-rib (1-4) are provided with outward-extending shear-resistant steel plates (7). The two sides of one end of the shear-resistant steel plate (7) are fixed inside the inverted T-rib (1-4) by the connector (8).

11. The T-rib lightweight composite plate according to claim 10, characterized in that, The connector (8) consists of several groups of L-shaped steel bars (8-1) distributed longitudinally and short longitudinal bars (8-2) connecting each group of L-shaped steel bars (8-1).

12. The T-rib lightweight composite plate according to claim 1, characterized in that, The weight-reducing core material (2) is made of EPS board or XPS board, and the cross-section of the weight-reducing core material (2) matches the dovetail-shaped through groove.

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