Truss type laminated concrete floor slab and construction method
By using a truss-type composite concrete floor slab structure, the problem of large deformation of UHPC composite concrete floor slabs was solved, achieving higher stiffness and crack resistance, and improving construction quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2026-03-31
AI Technical Summary
UHPC composite concrete floor slabs have the problem of large deformation during construction.
The structure adopts a truss-type composite concrete floor slab, including truss precast slabs, floor slab reinforcement and post-cast concrete. The steel truss is fixedly connected to the precast concrete, the wire mesh is located below the precast concrete, and the upper steel of the truss is located above. The wire mesh and the steel truss form an integral whole, which improves out-of-plane stiffness and axial stiffness, and enhances overall stiffness and crack resistance.
It effectively reduced the deformation of the floor slab, improved crack resistance and flexural bearing capacity, enhanced the shear resistance of the interface between the precast concrete slab and the post-cast concrete, and reduced the risk of overall cracking.
Smart Images
Figure CN121760480A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of precast concrete structure technology, and specifically relates to a truss-type composite concrete floor slab and its construction method. Background Technology
[0002] my country is vigorously developing prefabricated buildings, and precast concrete composite slabs are an important component of prefabricated buildings. Domestically, UHPC composite concrete slabs have been developed. These slabs combine UHPC with steel trusses to form a precast steel truss UHPC slab, which is then covered with cast-in-place concrete and slab reinforcement to form the UHPC composite concrete floor slab. 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 instead use silica fume and fibers (steel fibers or composite organic fibers). UHPC precast slabs are thin slabs, typically less than 50mm thick, and the reinforcement does not extend beyond the slab ends. UHPC composite concrete floor slabs effectively reduce the weight of precast floor slabs, but they suffer from significant deformation. Summary of the Invention
[0003] This invention provides a truss-type composite concrete floor slab and a construction method thereof, achieving the goal of reducing floor slab deformation.
[0004] To achieve the above objectives, the present invention adopts the following technical solution.
[0005] A truss-type composite concrete floor slab includes a precast truss slab, floor slab reinforcement, and post-cast concrete; the floor slab reinforcement includes upper longitudinal reinforcement and upper transverse reinforcement; the precast truss slab includes precast concrete, wire mesh, and a steel truss; the steel truss includes upper truss reinforcement, lower truss reinforcement, and truss web reinforcement connecting the two; the wire mesh includes transverse and longitudinal wires; the steel truss is fixedly connected to the precast concrete; the floor slab reinforcement is located on top of the precast concrete, arranged at intervals, and covered by the post-cast concrete.
[0006] Preferably, the upper longitudinal reinforcement is parallel to the upper truss and is arranged at intervals; the upper transverse reinforcement is perpendicular or oblique to the upper truss and is arranged at intervals.
[0007] Preferably, the floor slab reinforcement includes bottom longitudinal bars and / or bottom transverse bars; the bottom transverse bars intersect or are oblique to the bottom bars of the truss, and are arranged at intervals.
[0008] Preferably, the upper truss reinforcement is parallel to or oblique to the lower truss reinforcement, the upper truss reinforcement is located above the precast concrete, and the upper truss reinforcement and the lower truss reinforcement are connected as one unit by the truss web reinforcement; the wire mesh is located below the steel truss; the upper truss reinforcement is made of steel bars, structural steel or steel pipe; and the lower truss reinforcement is partially or entirely located within the precast concrete.
[0009] Preferably, the middle part of the truss bottom reinforcement is located inside the precast concrete, and one or both ends of the truss bottom reinforcement are exposed in the precast concrete and are wrapped by the post-cast concrete.
[0010] Preferably, the longitudinal and transverse steel wires are located inside the precast concrete; the precast truss slab has additional reinforcement; the additional reinforcement includes additional longitudinal bars and / or additional transverse bars; the additional reinforcement is partially or completely encased in precast concrete; the additional longitudinal bars are parallel to the bottom reinforcement 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 precast slab is rough.
[0013] Preferably, the floor slab reinforcement includes prestressed steel bars, which are encased in post-cast concrete.
[0014] The construction steps for a truss-type composite concrete floor slab are as follows:
[0015] Step 1: Fabrication of precast truss slabs
[0016] a. Prepare steel wire, reinforcing bars and / or structural steel and / or steel pipes, and concrete; fabricate steel trusses and wire mesh according to design requirements.
[0017] b. Formwork for supporting precast slabs;
[0018] c. Lay wire mesh and steel truss;
[0019] d. Pour precast concrete and cure it to the predetermined strength.
[0020] Step 2: Hoist the precast truss slabs to the designated positions on site;
[0021] Step 3: Lay the floor slab reinforcement on site: Lay the lower longitudinal bars and / or lower transverse bars, and then lay the upper longitudinal bars and upper transverse bars, with the spacing and height position meeting the design requirements.
[0022] Step 4: Pour the post-concrete on site and cure it to the predetermined strength. Attached Figure Description
[0023] The present invention will now be described in further detail with reference to the accompanying drawings.
[0024] Figure 1 Longitudinal elevation diagram of truss composite concrete floor slab Figure 1 .
[0025] Figure 2 Schematic diagram of the horizontal elevation of a truss-type composite concrete floor slab Figure 1 .
[0026] Figure 3Longitudinal elevation diagram of truss composite concrete floor slab Figure 2 .
[0027] Figure 4 Longitudinal elevation diagram of truss composite concrete floor slab Figure 3 .
[0028] Figure 5 Schematic diagram of truss composite concrete floor slab Figure 1 .
[0029] Figure 6 Schematic diagram of steel truss.
[0030] Attached reference numerals: A-Precast truss slab, B-Floor slab reinforcement, 1-Precast concrete, 2-Wire mesh, 2.1-Transverse wire, 2.2-Longitudinal wire, 3-Upper truss reinforcement, 4-Lower truss reinforcement, 5-Truss web reinforcement, 6-Lower longitudinal reinforcement, 7-Lower transverse reinforcement, 8-Upper longitudinal reinforcement, 9-Upper transverse reinforcement, 10-Post-cast concrete.
[0031] To better understand the purpose, technical solution, and function of this invention, the invention will be described in further detail below with reference to the accompanying drawings. Here, illustrative embodiments and their descriptions are used to explain the invention, but are not intended to limit the invention.
[0032] In the description of this invention, it should be understood that the terms "comprising / including," "consisting of," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements includes not only those elements but may also include, where necessary, other elements not expressly listed, or elements inherent to such a product, apparatus, process, or method. Without further limitation, an element defined by the phrase "comprising / including…" or "consisting of…" does not exclude the presence of additional identical elements in the product, apparatus, process, or method that includes said element.
[0033] In this invention, unless otherwise explicitly specified and limited, the term "fixed connection" should be interpreted broadly, for example: it can refer to a sleeve connection, an lap joint, welding, bolted connection, reinforcing steel embedded in concrete, or a combination of the above connections; the terms "installation," "connection," and "linking" should also be interpreted broadly, for example: they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components; the term "continuous reinforcing steel" refers to a continuous reinforcing steel without breaks, or a broken reinforcing steel but with a fixed connection between the broken reinforcing steel. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.
[0034] The implementation of the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments.
[0035] like Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, a truss-type composite concrete floor slab includes a truss precast slab A, floor slab reinforcement B, and post-cast concrete 10. The floor slab reinforcement B includes upper longitudinal reinforcement 8 and upper transverse reinforcement 9. The truss precast slab A includes precast concrete 1, wire mesh 2, and a steel truss. The steel truss includes upper truss reinforcement 3, lower truss reinforcement 4, and truss web reinforcement 5 connecting the two. The wire mesh 2 includes transverse steel wire 2.1 and longitudinal steel wire 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).
[0036] This application employs a truss-type composite concrete floor slab. The steel truss of the precast truss slab A is fixedly connected to the precast concrete slab as a whole, forming overall rigidity. A wire mesh 2 is installed within the precast concrete 1, forming a unified structure with the precast concrete. This increases the out-of-plane and axial stiffness of the precast concrete slab compared to a UHPC precast slab, reducing deformation of the precast concrete slab during construction and consequently reducing overall deformation of the composite concrete floor slab. The effective height of the truss reinforcement in this application is greater than that of the traditional steel truss UHPC precast slab, further enhancing the rigidity of the steel truss precast slab and reducing deformation.
[0037] In specific implementation, the thickness of the precast concrete slab 1 of the truss precast slab A shall not exceed 45mm, the diameter of the steel wire shall not exceed 6mm, preferably less than or equal to 4mm, the spacing of the steel wire mesh shall not exceed 150mm, and the steel wire mesh shall be located at the bottom of the precast concrete slab, meaning the bottom part shall not exceed 40% of the slab thickness. Function: To improve the crack resistance of the composite concrete floor slab.
[0038] In practice, the upper longitudinal reinforcement 8 is parallel to the upper truss reinforcement 3 and arranged at intervals, while the upper transverse reinforcement 9 intersects the upper truss reinforcement 3 perpendicularly or obliquely and is also arranged at intervals. The spacing of the upper reinforcement should not exceed 250mm. Function: To improve the crack resistance of the floor slab.
[0039] In practice, the floor slab reinforcement B includes bottom longitudinal bars 6 and bottom transverse bars 7. The bottom transverse bars 7 intersect or are oblique to the truss bottom bars 4, and are arranged at intervals. Function: To enhance the lateral and longitudinal bending capacity of the composite floor slab.
[0040] In practice, the floor slab reinforcement B includes the bottom transverse reinforcement 7, arranged at intervals. Its function is to enhance the lateral bending capacity of the composite floor slab.
[0041] In practice, the upper truss reinforcement 3 is parallel to the lower truss reinforcement 4, and is located above the precast concrete 1. The upper truss reinforcement 3 and the lower truss reinforcement 4 are connected as one unit by the truss web reinforcement 5. The wire mesh 2 is located below the steel truss A. The upper truss reinforcement 3 is made of steel bars, structural steel, or steel pipes. The lower truss reinforcement 4 is partially located within the precast concrete 1. "Partially" means that no less than 30% of the cross-sectional area of the lower truss reinforcement is located within the precast concrete 1. Function: To increase the overall stiffness of the precast concrete slab A of the steel truss, reduce the deformation of the composite floor slab, and improve the shear resistance of the interface between the precast concrete and the post-cast concrete.
[0042] In practice, all the bottom reinforcement bars 4 of the truss are located within the precast concrete 1. Function: To improve the overall rigidity of the composite floor slab, reduce deformation, and reduce cracking.
[0043] In practice, shear-resistant components are fixedly connected to the surfaces of the steel sections and steel pipes. This ensures that the upper steel of the truss and the subsequent concrete pouring of the floor slab form a unified whole.
[0044] In specific implementation, such as Figure 4 As shown, the middle portion of the truss bottom reinforcement 4 is entirely within the precast concrete 1, while one or both ends of the truss bottom reinforcement 4 are exposed above the precast concrete 1, with the exposed portion being no less than 40% of the cross-sectional area of the truss bottom reinforcement 4. The length range of the middle portion refers to no more than 90% of the length of the precast concrete slab. Function: To increase the bending stiffness and bending bearing capacity of the middle portion, and to improve the connection performance between the bottom reinforcement of the truss at the ends and the floor slab reinforcement.
[0045] In practice, the middle portion of the lower truss reinforcement 4 is partially located within the precast concrete 1, while one or both ends of the lower truss reinforcement 4 are exposed within the precast concrete 1. The cross-sectional area of the lower truss reinforcement 4 partially exposed within the precast concrete 1 is not less than 40% of the cross-sectional area of the lower truss reinforcement 4.
[0046] In practice, an upper wire mesh is installed inside the precast concrete 1. The diameter of the wire is no more than 6mm, preferably less than or equal to 4mm, and the spacing between the wire meshes is no more than 100mm. The wire mesh is located on top of the precast concrete 1, meaning the upper part does not exceed 40% of the slab thickness. Its function is to improve the rigidity of the composite floor slab, reduce deformation, and reduce cracking of the upper precast concrete.
[0047] In practice, the upper wire mesh is installed locally at the end of the precast concrete 1, and connected to the middle reinforcement of the lower truss reinforcement 4. The connection method is lap splicing or welding, and one or both ends of the lower truss reinforcement 4 are exposed above the precast concrete 1. Function: To improve the rigidity of the end composite floor slab, reduce deformation, and reduce cracking of the upper precast concrete.
[0048] In practice, the longitudinal steel wire 2.2 and the transverse steel wire 2.1 are located inside the precast concrete 1. The precast truss slab A has additional reinforcing bars, including additional longitudinal bars and / or additional transverse bars. The additional reinforcing bars are partially or completely encased in the precast concrete 1, and the additional longitudinal bars are parallel to the lower truss bars 4. Function: To increase the rigidity of the precast slab, reduce deformation, and reduce cracking.
[0049] 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: To improve the connection performance between the concrete floor slab and the support.
[0050] In practical implementation, the precast concrete 1 of the truss precast slab A contains coarse aggregate with a particle size of not less than 5mm, and the upper surface is rough, exposing the coarse aggregate. Function: To improve the shear resistance of the interface between precast concrete and post-cast concrete, increase the integrity of the composite concrete slab, enhance overall stiffness, reduce overall deformation, and reduce overall cracking.
[0051] In practice, the floor slab reinforcement B includes prestressed steel bars, which are encased in post-cast concrete 10. Function: To apply prestress and reduce cracking in the composite concrete floor slab.
[0052] In practice, some of the longitudinal wires 2.2 of the wire mesh 2 are prestressed wires. Their function is to apply prestress and reduce cracking in the composite concrete slab.
[0053] In practice, concrete 1 is polymer concrete, fiber-reinforced concrete, or UHPC. Its function is to increase the tensile strength of the bottom concrete, thereby reducing cracking in the concrete composite slab.
[0054] A method for fabricating a truss-type composite concrete floor slab, the construction steps of which are as follows:
[0055] Step 1: Fabrication of precast truss slab A
[0056] a. Prepare steel wire, reinforcing bars and / or structural steel and / or steel pipes, and concrete; fabricate steel trusses and wire mesh according to design requirements.
[0057] b. Formwork for supporting precast slabs;
[0058] c. Lay wire mesh 2 and steel truss;
[0059] d. Pour precast concrete 1 and cure precast concrete 1 to the predetermined strength.
[0060] Step 2: Hoist the precast truss slab A to the designated position on site;
[0061] Step 3: Lay the floor slab reinforcement on site: Lay the lower longitudinal reinforcement 6 and / or the lower transverse reinforcement 7, and then lay the upper longitudinal reinforcement 8 and the upper transverse reinforcement 9, with the spacing and height position meeting the design requirements.
[0062] Step 4: Pour 10 tons of post-concrete on site and cure the post-concrete to the predetermined strength.
[0063] The above embodiments only illustrate several implementation methods of this patent, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept, and these all fall within the protection scope of this invention. Therefore, the protection scope of this patent should be determined by the appended claims.
Claims
1. A trussed composite concrete floor slab characterised in that: The truss composite concrete floor comprises a truss prefabricated slab (A), a floor steel bar (B) and post-cast concrete (10); the floor steel bar (B) comprises upper longitudinal bars (8) and upper transverse bars (9); the truss prefabricated slab (A) comprises prefabricated concrete (1), steel wire mesh (2) and a steel bar truss; the steel bar truss comprises truss upper iron (3), truss lower bars (4) and truss web bars (5) connecting the two; the steel wire mesh (2) comprises transverse steel wires (2.1) and longitudinal steel wires (2.2); the steel bar truss is fixedly connected with the prefabricated concrete (1); the floor steel bar (B) is arranged on the upper part of the prefabricated concrete (1) and is covered by the post-cast concrete (10).
2. The trussed composite concrete floor according to claim 1, characterized in that: The upper longitudinal bars (8) are parallel to or oblique to the truss upper iron (3) and are arranged at intervals.
3. The trussed composite concrete floor slab of claim 1, wherein: The floor steel bar (B) comprises lower longitudinal bars (6) and / or lower transverse bars (7); the lower transverse bars (7) are perpendicular or oblique to the truss lower bars (4) and are arranged at intervals.
4. The trussed composite concrete floor slab of claim 1, wherein: The truss upper iron (3) is parallel to the truss lower bars (4); the truss upper iron (3) is located above the prefabricated concrete (1); the truss upper iron (3) and the truss lower bars (4) are connected into one by the truss web bars (5); the steel wire mesh (2) is located below the steel bar truss (A); the truss upper iron (3) is steel bar, profile steel or steel pipe; the truss lower bars (4) are partially or entirely located in the prefabricated concrete (1).
5. The trussed composite concrete floor according to claim 1, characterized in that: The middle part of the truss lower bars (4) is located in the prefabricated concrete (1); one end or both ends of the truss lower bars (4) are exposed from the prefabricated concrete (1) and are wrapped by the post-cast concrete (10).
6. The trussed 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 prefabricated concrete (1); the truss prefabricated slab (A) has additional steel bars; the additional steel bars comprise additional longitudinal bars and / or additional transverse bars; the additional steel bars are partially or entirely wrapped by the prefabricated concrete (1); the additional longitudinal bars are parallel to the truss lower bars (4).
7. The trussed composite concrete floor according to claim 3, wherein: At least one end of the lower longitudinal bars (6) extends out of the prefabricated concrete (1).
8. The trussed composite concrete floor according to claim 1, wherein: The upper surface of the truss prefabricated slab (A) is a rough surface.
9. The trussed composite concrete floor according to claim 1, wherein: The floor steel bar (B) comprises prestressed steel bars which are wrapped by the post-cast concrete (10).
10. A method of constructing a trussed composite concrete floor, characterised in that, The construction steps are as follows: Step one, manufacturing the truss prefabricated slab (A) a. preparing steel wires, steel bars and / or profile steels and / or steel pipes and concrete, manufacturing the steel bar truss, the steel wire mesh (2) according to the design requirements; b. erecting the formwork of the prefabricated slab; c. laying the steel wire mesh (2) and the steel bar truss; d. pouring the prefabricated concrete (1) and curing the prefabricated concrete (1) to the predetermined strength. Step two, hoisting the truss prefabricated slab (A) to the predetermined position on site; Step three, laying the floor steel bar on site: laying the lower longitudinal bars (6) and / or the lower transverse bars (7) and then laying the upper longitudinal bars (8) and the upper transverse bars (9), the interval and the height position meeting the design requirements. Step four, pouring the post-cast concrete (10) on site and curing the post-cast concrete (10) to the predetermined strength.