Truss type laminated concrete floor slab
By introducing a truss structure and wire mesh into the UHPC composite concrete floor, the problem of large floor deformation was solved, higher stiffness and crack resistance were achieved, and the overall bearing capacity was improved.
Patent Information
- Application Number
- CN202422396530.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-09-30
AI Technical Summary
UHPC composite concrete slabs have the problem of large deformation during construction.
A truss-type composite concrete floor structure is adopted, including truss precast slabs, floor slab steel bars and post-cast concrete. The steel truss is fixedly connected to the precast concrete, steel mesh is added to improve the out-of-plane stiffness and axial stiffness, and the steel bar layout is optimized to reduce deformation.
It effectively reduces the deformation of the floor slab, improves the crack resistance and bending bearing capacity, enhances the overall stiffness and shear resistance, and improves the interface performance between precast concrete and post-poured concrete.
Smart Images
Figure CN223305246U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of precast concrete structures, in particular to a truss type composite concrete floor slab. Background Art
[0002] my country is vigorously developing prefabricated buildings, of which precast concrete composite slabs are an important part of prefabricated buildings. The country has developed UHPC composite concrete slabs, which use a combination of UHPC and steel trusses to form steel truss UHPC precast slabs, which are covered with post-poured concrete and slab steel bars to form UHPC composite concrete slabs. UHPC precast slabs are ultra-high performance concrete slabs. Unlike ordinary concrete slabs or other high-performance concrete slabs, these precast slabs do not use coarse aggregates, but use silica fume and fibers (steel fibers or composite organic fibers). UHPC precast slabs are thin plates, usually less than 50mm thick, and the steel bars do not extend beyond the ends of the slabs. UHPC composite concrete slabs effectively reduce the weight of precast slabs, but there is a problem of large deformation. Utility Model Content
[0003] The utility model provides a truss type composite concrete floor slab, which achieves the goal of reducing the deformation of the floor slab.
[0004] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.
[0005] A truss-type composite concrete floor slab comprises a truss precast slab, floor slab reinforcement and post-cast concrete; the floor slab reinforcement comprises upper longitudinal reinforcement and upper transverse reinforcement; the truss precast slab comprises precast concrete, steel wire mesh and steel truss; the steel truss comprises truss upper iron, truss lower reinforcement and truss web reinforcement connecting the two; the steel wire mesh comprises transverse steel wires and longitudinal steel wires; the steel truss is fixedly connected to the precast concrete; the floor slab reinforcement is located on the upper part of the precast concrete, arranged at intervals and covered by post-cast concrete.
[0006] Preferably, the upper longitudinal reinforcement is parallel to the truss upper iron and is arranged at intervals; the upper transverse reinforcement is perpendicular or oblique to the truss upper iron and is arranged at intervals.
[0007] Preferably, the floor slab reinforcement includes lower longitudinal reinforcement and / or lower transverse reinforcement; the lower transverse reinforcement is perpendicular or oblique to the truss lower reinforcement and is arranged at intervals.
[0008] Preferably, the truss upper iron is parallel to or obliquely intersecting with the truss lower reinforcement, the truss upper iron is located above the precast concrete, and the truss upper iron and the truss lower reinforcement are connected as a whole through the truss web reinforcement; the wire mesh is located below the steel truss; the truss upper iron is steel bar, steel section or steel pipe; the truss lower reinforcement is partially or completely located in the precast concrete.
[0009] Preferably, the middle portion of the truss lower reinforcement is located in the precast concrete, and one or both ends of the truss lower reinforcement are exposed from the precast concrete and are wrapped by post-cast concrete.
[0010] Preferably, the longitudinal steel wires and the transverse steel wires are located inside the precast concrete; the truss precast panels have additional steel bars; the additional steel bars include additional longitudinal bars and / or additional transverse bars; the additional steel bars are partially or completely wrapped by the precast concrete; and the additional longitudinal bars are parallel to the lower bars of the truss.
[0011] Preferably, at least one end of the lower longitudinal reinforcement extends out of the precast concrete;
[0012] Preferably, the upper surface of the truss prefabricated panel is a rough surface.
[0013] Preferably, the floor slab reinforcement includes prestressed reinforcement, and the prestressed reinforcement is wrapped by post-cast concrete. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention will be further described in detail below with reference to the accompanying drawings.
[0015] Figure 1 Schematic diagram of the longitudinal elevation of the truss-type composite concrete floor Figure 1 .
[0016] Figure 2 Schematic diagram of the horizontal elevation of the truss-type composite concrete floor Figure 1 .
[0017] Figure 3 Schematic diagram of the longitudinal elevation of the truss-type composite concrete floor Figure 2 .
[0018] Figure 4 Schematic diagram of the longitudinal elevation of the truss-type composite concrete floor Figure 3 .
[0019] Figure 5 Schematic diagram of the plan of truss-type composite concrete floor Figure 1 .
[0020] Figure 6 Schematic diagram of steel truss.
[0021] Figure numbers: A-truss precast slab, B-floor slab reinforcement 1-precast concrete, 2-steel mesh, 2.1-transverse steel wire, 2.2-longitudinal steel wire, 3-truss upper iron, 4-truss lower reinforcement, 5-truss web reinforcement, 6-lower longitudinal reinforcement, 7-lower transverse reinforcement, 8-upper longitudinal reinforcement, 9-upper transverse reinforcement, 10-post-poured concrete. DETAILED DESCRIPTION
[0022] In order to better understand the purpose, technical solutions and functions of the present invention, the present invention is described in further detail below in conjunction with the accompanying drawings. Here, the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.
[0023] In the description of the present invention, it should be understood that the terms "comprises / comprising", "consisting of" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product, apparatus, process or method comprising a series of elements includes not only those elements, but also, when necessary, other elements not explicitly listed, or elements inherent to such product, apparatus, process or method. In the absence of further limitations, elements defined by the phrases "comprises / comprising..." or "consisting of" do not exclude the presence of other identical elements in the product, apparatus, process or method comprising the elements.
[0024] In the present invention, unless otherwise clearly specified and limited, the term "fixed connection" should be understood in a broad sense, for example: it can be a sleeve connection, a lap joint, a welding connection, a bolt connection, a steel bar embedded in concrete, or a combination of the above connections; the terms "installation", "connection", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components; the term "through-length steel bar" means that the steel bar is continuous without disconnection, or the steel bar is disconnected but the disconnected steel bars are fixedly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0025] The following describes the implementation of the present invention in detail with reference to the accompanying drawings using preferred embodiments.
[0026] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 As shown, a truss-type composite concrete floor slab comprises a truss precast panel A, floor slab reinforcement B and post-cast concrete 10, the floor slab reinforcement B comprises upper longitudinal reinforcement 8 and upper transverse reinforcement 9, the truss precast panel A comprises precast concrete 1, a steel mesh 2 and a steel truss, the steel truss comprises an upper truss iron 3, a lower truss reinforcement 4 and a truss web reinforcement 5 connecting the two, the steel mesh 2 comprises transverse steel wires 2.1 and longitudinal steel wires 2.2, the steel truss is fixedly connected to the precast concrete 1, the floor slab reinforcement (B) is located on the upper part of the precast concrete (1), arranged at intervals, and covered by the post-cast concrete (10).
[0027] This application uses a truss-type composite concrete floor slab. The steel truss of the truss precast panel A is fixedly connected to the precast concrete panel as a whole to form an overall rigidity. A steel mesh 2 is set in the precast concrete 1. The steel mesh and the precast concrete form a whole. Compared with the UHPC precast panel, the out-of-plane rigidity and axial rigidity of the precast concrete panel are improved, which can reduce the deformation of the precast concrete panel during construction, and thus reduce the overall deformation of the composite concrete floor slab. The effective height of the truss steel bars of this application is greater than the effective height of the steel truss of the traditional steel truss UHPC precast panel, which also improves the rigidity of the steel truss precast panel and reduces deformation.
[0028] In practice, the precast concrete slab 1 of the truss precast panel A has a thickness of no greater than 45 mm, a steel wire diameter of no greater than 6 mm, preferably less than or equal to 4 mm, and a wire mesh spacing of no greater than 150 mm. The wire mesh is located at the bottom of the precast concrete slab, where the bottom portion does not exceed 40% of the slab thickness. This improves the crack resistance of the composite concrete slab.
[0029] In practice, the upper longitudinal reinforcement 8 is parallel to the truss upper rails 3 and spaced apart. The upper transverse reinforcement 9 is perpendicular or oblique to the truss upper rails 3 and spaced apart. The spacing between the upper reinforcement bars should not exceed 250mm. Purpose: Improves the crack resistance of the floor slab.
[0030] In practice, the floor slab reinforcement B includes lower longitudinal reinforcement 6 and lower transverse reinforcement 7. The lower transverse reinforcement 7 is arranged perpendicularly or obliquely to the truss lower reinforcement 4 and is spaced apart. Its purpose is to increase the transverse and longitudinal bending resistance of the composite floor slab.
[0031] In practice, the floor slab reinforcement B includes lower transverse reinforcement 7, which is arranged at intervals. Function: To enhance the transverse bending bearing capacity of the composite floor slab.
[0032] In specific implementation, the truss upper rails 3 are parallel to the truss lower bars 4 and positioned above the precast concrete slab 1. The truss upper rails 3 and the truss lower bars 4 are connected as a single unit via truss web reinforcement 5. The steel mesh 2 is positioned below the reinforced truss A. The truss upper rails 3 are constructed of steel bars, steel sections, or steel pipes, and the truss lower bars 4 are partially located within the precast concrete slab 1. Partially, this refers to the presence of at least 30% of the cross-sectional area of the truss lower bars within the precast concrete slab 1. This design enhances the overall stiffness of the reinforced truss precast concrete slab A, reduces deformation of the composite floor slab, and improves the shear resistance of the interface between the precast concrete and post-cast concrete.
[0033] In specific implementation, the truss lower reinforcement 4 is entirely located in the precast concrete 1. Function: Improve the overall rigidity of the composite floor slab, reduce deformation, and reduce cracking.
[0034] In the specific implementation, the steel section and the steel pipe surface are fixedly connected with the shear members, so that the truss upper iron and the post-cast concrete of the floor slab form a whole.
[0035] When implementing it specifically, Figure 4 As shown, the entire middle portion of the truss lower reinforcement 4 is located within the precast concrete 1. One or both ends of the truss lower reinforcement 4 are exposed, with the exposed portion representing no less than 40% of the cross-sectional area of the truss lower reinforcement 4. The middle portion of the truss lower reinforcement 4 extends no further than 90% of the length of the precast concrete slab. This increases the flexural stiffness and bearing capacity of the middle portion, while also improving the connection between the truss lower reinforcement at the ends and the floor slab reinforcement.
[0036] In specific implementation, the middle part of the truss lower reinforcement 4 is partially located in the precast concrete 1, and one or both ends of the truss lower reinforcement 4 are exposed from the precast concrete 1. The cross-sectional area of the truss lower reinforcement 4 partially exposed from the precast concrete 1 is not less than 40% of the cross-sectional area of the truss lower reinforcement 4.
[0037] In practice, an upper steel mesh is installed within the precast concrete 1. The wire diameter is no greater than 6 mm, preferably less than or equal to 4 mm, and the spacing between the wire meshes is no greater than 100 mm. The steel mesh is located above the precast concrete 1, with the upper portion not exceeding 40% of the slab thickness. This serves to increase the rigidity of the composite floor slab, reduce deformation, and mitigate cracking in the upper precast concrete.
[0038] In practice, the upper steel mesh is installed locally at the end of the precast concrete 1 and connected to the middle steel bars of the truss lower reinforcement 4 by lap joint or welding. One or both ends of the truss lower reinforcement 4 are exposed from the precast concrete 1. Its purpose: to enhance the rigidity of the end composite floor slab, reduce deformation, and reduce cracking in the upper precast concrete.
[0039] In practice, longitudinal steel wires 2.2 and transverse steel wires 2.1 are located within precast concrete 1. The truss precast panels A have additional reinforcement, including additional longitudinal and / or transverse reinforcement. The additional reinforcement is partially or fully encased in precast concrete 1. The additional longitudinal reinforcement is parallel to the truss lower reinforcement 4. This increases the rigidity of the precast panels, reduces deformation, and reduces cracking.
[0040] In practice, at least one end of the lower longitudinal reinforcement 6 extends out of the precast concrete 1 and is inserted into the support. Function: Improves the connection performance between the concrete floor slab and the support.
[0041] In practice, the precast concrete 1 of the truss precast panel A contains coarse aggregate with a particle size of no less than 5 mm. The upper surface is roughened, exposing the coarse aggregate. This improves the shear resistance of the interface between the precast concrete and the post-cast concrete, enhancing the integrity of the composite concrete slab, improving overall stiffness, and reducing overall deformation and cracking.
[0042] In specific implementation, the floor slab reinforcement B includes prestressed reinforcement, which is wrapped by post-cast concrete 10. Function: Apply prestressing force to reduce cracks in the composite concrete floor slab.
[0043] In a specific implementation, some longitudinal steel wires 2.2 of the steel mesh 2 are prestressed steel wires. Function: to apply prestress to reduce cracks in the composite concrete floor slab.
[0044] In specific implementation, the concrete 1 is polymer concrete, fiber concrete, or UHPC. Function: Increase the tensile strength of the bottom concrete and reduce cracks in the concrete composite slab.
[0045] The above embodiments merely illustrate several implementation methods of this patent. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of this utility model, and these variations and improvements fall within the scope of protection of this utility model. Therefore, the scope of protection of this utility model patent shall be determined by the appended claims.
Claims
1. A truss-type composite concrete floor slab, characterized by: The truss-type composite concrete floor slab comprises a truss precast plate (A), floor slab reinforcement (B) and post-cast concrete (10); the floor slab reinforcement (B) comprises upper longitudinal reinforcement (8) and upper transverse reinforcement (9); the truss precast plate (A) comprises precast concrete (1), a steel mesh (2) and a steel truss; the steel truss comprises a truss upper iron (3), a truss lower reinforcement (4) and a truss web reinforcement (5) connecting the two; the steel mesh (2) comprises transverse steel wires (2.1) and longitudinal steel wires (2.2); the steel truss is fixedly connected to the precast concrete (1); the floor slab reinforcement (B) is located on the upper part of the precast concrete (1), arranged at intervals, and covered by the post-cast concrete (10).
2. The truss-type composite concrete floor according to claim 1, characterized in that: The upper longitudinal reinforcement (8) is parallel to or obliquely intersecting the truss upper iron (3) and is arranged at intervals; the upper transverse reinforcement (9) is perpendicular to or obliquely intersecting the truss upper iron (3) and is arranged at intervals.
3. The truss-type composite concrete floor according to claim 1, characterized in that: The floor slab reinforcement (B) comprises lower longitudinal reinforcement (6) and / or lower transverse reinforcement (7); the lower transverse reinforcement (7) and the truss lower reinforcement (4) are perpendicular or obliquely intersected and arranged at intervals.
4. The truss-type composite concrete floor according to claim 1, characterized in that: The truss upper iron (3) is parallel to the truss lower rib (4), the truss upper iron (3) is located above the precast concrete (1), and the truss upper iron (3) and the truss lower rib (4) are connected as a whole via the truss web rib (5); the steel mesh (2) is located below the steel truss; the truss upper iron (3) is a steel bar, a section steel or a steel pipe; and the truss lower rib (4) is partially or completely located in the precast concrete (1).
5. The truss-type composite concrete floor according to claim 1, characterized in that: The middle portion of the truss lower reinforcement (4) is located in the precast concrete (1), and one or both ends of the truss lower reinforcement (4) are exposed from the precast concrete (1) and are wrapped by the post-cast concrete (10).
6. The truss-type composite concrete floor according to claim 1, characterized in that: The longitudinal steel wires (2.2) and the transverse steel wires (2.1) are located inside the precast concrete (1); the truss precast plate (A) has additional steel bars; the additional steel bars include additional longitudinal bars and / or additional transverse bars; the additional steel bars are partially or completely wrapped by the precast concrete (1); and the additional longitudinal bars are parallel to the truss lower bars (4).
7. The truss-type composite concrete floor according to claim 3, characterized in that: At least one end of the lower longitudinal reinforcement (6) extends out of the precast concrete (1).
8. The truss-type composite concrete floor according to claim 1, characterized in that: The upper surface of the truss precast panel (A) is a rough surface.
9. The truss-type composite concrete floor according to claim 1, characterized in that: The floor slab reinforcement (B) includes prestressed steel bars which are wrapped by post-cast concrete (10).