Truss type composite floor slab concrete support
By setting up wire mesh and truss steel bars in the precast concrete slab, and overlapping with additional steel bars of the truss lower bars with the support, the problems of high construction difficulty and poor connection performance of the precast concrete stacked slab are solved, reducing deformation and cracking are achieved, and the connection performance with the concrete support is improved.
Patent Information
- Application Number
- CN202422396865.6
- 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
Traditional precast concrete stacked slabs have problems such as difficult construction, heavy weight and easy cracking, while UHPC stacked concrete floors have problems such as large deformation and poor connection performance with concrete support.
The truss-type overlapping floor slab structure is adopted. By installing steel wire mesh and truss steel bars in the precast concrete slab of the steel bars, the lower bars of the truss are partially or all located in the precast concrete, and overlap with the additional steel bars of the support, and are wrapped in the back poured concrete to improve the overall stiffness and connection performance.
Effectively reduce the deformation and cracking of precast concrete slabs, improve the connection performance with concrete supports, and simplify the construction process.
Smart Images
Figure CN223305172U_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 floor slab concrete support. Background Art
[0002] Prefabricated buildings often use precast concrete composite slabs. Traditional precast concrete composite slabs are usually thick slabs, usually thicker than 50mm. Steel bars and steel trusses are set inside the slabs, and the steel bars inside the slabs extend out of the slab ends. This type of precast concrete composite floor slab has the problems of high construction difficulty, heavy weight, and easy cracking. In order to solve this problem, the UHPC composite concrete slab was developed in China, which covered the steel truss UHPC precast slabs with post-cast concrete and floor slab steel bars to form UHPC composite concrete slabs. The thickness of UHPC precast slabs is usually less than 50mm, which is a thin plate, and the steel bars do not extend out of the slab ends; the precast slabs do not use coarse aggregates, but use silica fume and fibers, and the fibers are steel fibers or organic fibers. The UHPC composite concrete slabs effectively reduce the weight of precast floor slabs, but there are problems such as large deformation and poor connection performance with concrete supports. Utility Model Content
[0003] The utility model provides a truss type composite floor concrete support, which improves the performance target of the connection between the thin prefabricated composite floor and the concrete support.
[0004] In order to achieve the above-mentioned purpose, the present utility model adopts the following technical solutions.
[0005] A truss-type composite floor concrete support comprises a reinforced truss precast concrete slab, a support, additional reinforcement for the support, floor slab reinforcement and post-cast concrete; the floor slab reinforcement comprises an upper floor slab longitudinal reinforcement and an upper floor slab transverse reinforcement; the floor slab reinforcement is located on the upper part of the reinforced truss precast concrete slab and is covered by post-cast concrete; the reinforced truss precast concrete slab comprises precast concrete, a steel wire mesh and a reinforced truss; the reinforced truss comprises a longitudinal truss upper iron, a longitudinal truss lower reinforcement and a truss web reinforcement connecting the two; the steel wire mesh comprises a transverse steel wire and a longitudinal steel wire; the additional reinforcement for the support comprises an upper support reinforcement and a lower support reinforcement; one end of the lower support reinforcement is inserted into the support and the other end is connected to the lower truss reinforcement; the support comprises support concrete and support reinforcement.
[0006] Preferably, the additional steel bars under the support and the lower reinforcement of the truss are overlapped; the lower reinforcement of the truss in the overlapped area is partially or completely exposed from the precast concrete and is wrapped by the post-poured concrete.
[0007] Preferably, part or all of the lower reinforcement of the middle section truss is located in the precast concrete, and part or all of the lower reinforcement of the end section truss is exposed from the precast concrete and is wrapped by the post-cast concrete.
[0008] Preferably, the upper iron of the truss is parallel to the lower reinforcement of the truss, the upper iron of the truss is located above the precast concrete, and the upper iron of the truss and the lower reinforcement of the truss are connected as a whole through the truss web reinforcement; the steel truss is fixedly connected to the precast concrete; the wire mesh is located below the steel truss; the upper iron of the truss is steel bar, steel section or steel pipe; the lower reinforcement of the truss is partially or completely located in the precast concrete; one end of the additional steel bar on the support is inserted into the support, and the other end is connected to the upper iron of the truss and is wrapped by post-poured concrete.
[0009] Preferably, the floor slab reinforcement includes lower reinforcement; the lower reinforcement is the lower floor slab longitudinal reinforcement and / or the lower floor slab transverse reinforcement; the lower reinforcement is connected to the additional reinforcement under the support and is wrapped by post-poured concrete.
[0010] Preferably, one end of the additional steel bar on the support is inserted into the support, and the other end is connected to the iron on the truss; the support is a beam or a wall; the support steel bars of the beam include beam stirrups and beam longitudinal bars; the support steel bars of the wall include wall longitudinal bars and wall transverse bars.
[0011] Preferably, the upper floor slab longitudinal reinforcement and / or the upper floor slab transverse reinforcement are inserted into the supports.
[0012] Preferably, the reinforced truss precast concrete slab 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 precast concrete; the additional longitudinal bars are parallel to the lower bars of the truss; one end of the additional steel bars under the support is inserted into the support, and the other end is connected to the additional steel bars.
[0013] Preferably, the upper surface and end surfaces of the steel bar truss precast concrete slab are rough surfaces.
[0014] Compared with the prior art, the present invention has the following characteristics and beneficial effects.
[0015] 1. The truss reinforcement is cut off at the end of the precast concrete slab and overlapped with the additional reinforcement of the concrete support to facilitate construction;
[0016] 2. Part or all of the lower reinforcement of the truss is located in the precast concrete, which improves the stiffness and ductility of the precast concrete thin plate, reduces its deformation and cracking, and improves the connection performance with the concrete support.
[0017] 3. Install wire mesh inside precast concrete to increase the stiffness and ductility of precast concrete slabs, reduce their deformation and cracking, and improve their connection performance with concrete supports.
[0018] 4. The lower reinforcement of the truss at one or both ends is exposed from the precast concrete, connected to the concrete support reinforcement, and wrapped with post-poured concrete to improve the connection performance between the floor slab and the concrete support. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The present invention will be further described in detail below with reference to the accompanying drawings.
[0020] Figure 1 Cross-section diagram of concrete support of truss composite floor Figure 1 .
[0021] Figure 2 Schematic diagram of the longitudinal elevation of the truss-type composite concrete floor Figure 1 .
[0022] Figure 3 Schematic diagram of the horizontal elevation of the truss-type composite concrete floor Figure 1 .
[0023] Figure 4 Schematic diagram of the longitudinal elevation of the truss-type composite concrete floor Figure 2 .
[0024] Figure 5 Schematic diagram of the longitudinal elevation of the truss-type composite concrete floor Figure 3 .
[0025] Figure 6 Schematic diagram of the plan of truss-type composite concrete floor Figure 1 .
[0026] Figure 7 Schematic diagram of the truss reinforcement elevation.
[0027] Figure 8 Cross-section diagram of concrete support of truss composite floor Figure 2 .
[0028] Figure 9 Cross-section diagram of concrete support of truss composite floor Figure 3 .
[0029] Figure 10 Cross-section diagram of concrete support of truss composite floor Figure 4 .
[0030] Figure markings: A-reinforced truss precast concrete slab, B-support, 1-precast concrete, 2-wire 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 floor slab longitudinal reinforcement, 7-lower floor slab transverse reinforcement, 8-upper floor slab longitudinal reinforcement, 9-upper floor slab transverse reinforcement, 10-post-poured concrete, 11-additional reinforcement on the support, 12-additional reinforcement under the support, 13-support reinforcement, 14-support concrete. DETAILED DESCRIPTION
[0031] 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.
[0032] 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.
[0033] 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 fixed connection between steel bars and 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 integrated connection; it can be a direct connection, or an indirect connection 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.
[0034] The following describes the implementation of the present invention in detail with reference to the accompanying drawings using preferred embodiments.
[0035] like Figures 1 to 7 As shown, a truss-type composite floor concrete support includes a reinforced truss precast concrete slab A, a support B, additional support reinforcement, floor slab reinforcement, and post-cast concrete 10. The floor slab reinforcement includes upper floor slab longitudinal reinforcement 8 and upper floor slab transverse reinforcement 9. The floor slab reinforcement is located above the reinforced truss precast concrete slab A and is covered by post-cast concrete 10. The reinforced truss precast concrete slab A includes precast concrete 1, steel mesh 2, and a reinforced truss. The reinforced truss includes longitudinal truss upper bars 3, longitudinal truss lower bars 4, and truss web bars 5 connecting the two. The steel mesh 2 includes transverse steel wires 2.1 and longitudinal steel wires 2.2. The additional support reinforcement includes upper support reinforcement 11 and lower support reinforcement 12. One end of the lower support reinforcement 12 is inserted into the support and the other end is connected to the lower truss bar 4. The support B includes support concrete 14 and support reinforcement 13.
[0036] Analysis revealed that the UHPC composite concrete slabs were connected to the concrete supports through additional reinforcement, forming a single unit and encased in concrete. However, the UHPC precast slabs had low rigidity and exhibited significant deformation during construction. This generated significant additional forces on the supports, reducing the connection performance.
[0037] The present application adopts a truss-type composite concrete floor slab connected with a concrete support B. The truss-type composite concrete floor slab is a floor slab with relatively small deformation. The steel truss of the truss precast panel A is fixedly connected to the precast concrete panel as a whole to form overall rigidity. A steel mesh 2 is arranged in the precast concrete 1. The steel mesh and the precast concrete form a whole, which improves the out-of-plane rigidity and axial rigidity of the precast concrete panel compared to the UHPC precast panel, and can reduce the deformation of the precast concrete panel during construction, thereby reducing the overall deformation of the composite concrete floor slab. The effective height of the truss steel bars of the present 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 the deformation of the floor slab. It reduces the additional force on the support and improves the connection performance with the support.
[0038] In specific implementation, the diameter of the additional steel bars in the supports should be no less than 8mm, and the spacing should be no greater than 250mm. In specific implementation, the thickness of the precast concrete slab 1 of the truss precast panel A should be no greater than 45mm, the diameter of the steel wire should be no greater than 6mm, and preferably less than or equal to 4mm. The spacing of the wire mesh should be no greater than 150mm, and preferably no greater than 100mm. The wire mesh should be located at the bottom of the precast concrete slab, with the bottom portion not exceeding 40% of the slab thickness. This function: Reduce deformation and cracking of the composite floor slab and improve the connection performance with the supports.
[0039] In specific implementation, the additional reinforcement bars 12 under the support are overlapped with the lower truss bars 4, with an overlap length of no less than 15d (d being the bar diameter). The lower truss bars 4 in the overlapped area are partially or completely exposed from the precast concrete 1 and encased in post-cast concrete 10. The exposed area should account for no less than 40% of the cross-sectional area of the lower truss bars 4. This improves the force transmission performance between the additional reinforcement bars 12 and the lower truss bars 4.
[0040] In practice, the middle section of the truss lower reinforcement 4 is partially or completely located within the precast concrete 1, while the truss lower reinforcement 4 at one or both ends is partially or completely exposed from the precast concrete 1 and encased in post-cast concrete 10. The exposed portion accounts for no less than 40% of the cross-sectional area of the truss lower reinforcement 4. The length of the middle section does not exceed 90% of the length of the precast concrete slab. This improves the connection between the truss lower reinforcement at the end and the floor slab reinforcement, thereby reducing floor slab deformation.
[0041] In specific implementation, the truss upper rail 3 is parallel to the truss lower reinforcement 4 and is positioned above the precast concrete 1. The truss upper rail 3 and the truss lower reinforcement 4 are connected as one piece via the truss web reinforcement 5. The steel truss is fixedly connected to the precast concrete 4. The wire mesh 2 is positioned below the steel truss A. The truss upper rail 3 is made of steel, section steel, or steel pipe. The truss lower reinforcement 4 is partially or completely located within the precast concrete 1. The additional reinforcement 11 on the support has one end inserted into the support and one end connected to the truss upper rail 3, encased in post-cast concrete 10. The additional reinforcement on the support is overlapped with the truss upper rail, with a overlap length of no less than 20d, where d is the diameter of the reinforcement. Function: Reduce floor slab deformation and improve the resistance of the floor slab ends to negative bending moments.
[0042] 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 reduces deformation and improves the connection with the concrete support.
[0043] In specific implementation, the upper steel wire mesh is locally provided at the end of the precast concrete 1 and is connected to the middle steel bar of the truss lower reinforcement 4 by overlapping or welding.
[0044] In practice, the floor slab reinforcement includes lower reinforcement, which consists of lower slab longitudinal reinforcement 6 and / or lower slab transverse reinforcement. The lower reinforcement is connected to the additional reinforcement 12 below the support and is encased in post-cast concrete 10. The lower reinforcement is connected to the additional reinforcement 12 below the support using an overlap method, with a overlap length of no less than 15d, where d is the diameter of the reinforcement. This serves to strengthen the connection between the floor slab and the support.
[0045] like Figure 8 and Figure 10 As shown, in a specific implementation, the support is a concrete wall or concrete beam with floor slabs on both sides. The additional reinforcement 11 on the support is continuous, passing through the concrete wall and connecting to the truss iron 3 using an overlap connection. This improves the resistance of the support-floor connection to negative bending moments.
[0046] like Figure 9 As shown, in a specific implementation, the support is a concrete beam with a floor slab on one side. One end of the additional steel bar 11 on the support is inserted into the support and the other end is connected to the iron 3 on the truss. Function: Improve the performance of the support-floor connection in resisting negative bending moments.
[0047] In practice, the support reinforcement 13 for concrete beams consists of beam stirrups and longitudinal reinforcement; the support reinforcement 13 for concrete walls consists of longitudinal and transverse wall reinforcement. The additional support reinforcement is inserted into the support reinforcement and encased in the support concrete. This improves the connection between the additional support reinforcement and the support.
[0048] In practice, the upper slab longitudinal reinforcement 8 and / or upper slab transverse reinforcement 9 are inserted into the concrete supports. The upper slab reinforcement is inserted continuously into the supports, without overlapping. This improves the negative moment resistance of the support-to-slab connection.
[0049] In practice, the reinforced truss precast concrete slab A has additional reinforcement. The additional reinforcement includes additional longitudinal and / or transverse reinforcement. The additional reinforcement is partially or completely encased in precast concrete 1. The additional longitudinal reinforcement is parallel to the lower truss reinforcement 4. The additional reinforcement 12 below the support has one end inserted into the support and the other end connected to the additional reinforcement. This improves the stiffness and bearing capacity of the precast concrete slab, reduces deformation, and enhances the connection to the support.
[0050] In specific implementation, the upper surface and end surface of the steel truss precast concrete slab A are roughened. Function: Improve the shear resistance of the floor slab interface and the shear resistance of the floor slab and support interface.
[0051] 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 floor concrete support, characterized by: The truss-type composite floor slab concrete support comprises a steel truss precast concrete slab (A), a support (B), additional steel bars for the support, floor slab steel bars and post-cast concrete (10); the floor slab steel bars comprise upper floor slab longitudinal bars (8) and upper floor slab transverse bars (9); the floor slab steel bars are located on the upper part of the steel truss precast concrete slab (A) and are covered by post-cast concrete (10); The steel truss precast concrete slab (A) comprises precast concrete (1), a steel wire mesh (2) and a steel truss; the steel truss comprises a longitudinal truss upper iron (3), a longitudinal truss lower rib (4) and a truss web rib (5) connecting the longitudinal truss upper iron (3), a longitudinal truss lower rib (4) and a truss web rib (5) connecting the longitudinal truss lower iron (4); the steel wire mesh (2) comprises a transverse steel wire (2.1) and a longitudinal steel wire (2.2); The additional reinforcement of the support comprises an additional reinforcement on the support (11) and an additional reinforcement under the support (12); one end of the additional reinforcement under the support (12) is inserted into the support (B), and the other end is connected to the truss lower reinforcement (4); The support (B) comprises support concrete (14) and support steel bars (13).
2. The truss-type composite floor concrete support according to claim 1, characterized in that: The additional steel bars (12) under the support and the lower truss bars (4) are overlapped; the lower truss bars (4) in the overlapped area are partially or completely exposed from the precast concrete (1) and are wrapped by the post-cast concrete (10).
3. The truss-type composite floor concrete support according to claim 2, characterized in that: Part or all of the lower reinforcement (4) of the middle section truss is located in the precast concrete (1), and part or all of the lower reinforcement (4) of the end section truss is exposed from the precast concrete (1) and is wrapped by the post-cast concrete (10).
4. The truss type composite floor concrete support according to claim 1, characterized in that: The steel truss is fixedly connected to the precast concrete (1); the steel mesh (2) is located below the steel truss; the truss upper iron (3) is steel bar, steel section or steel pipe; the truss lower reinforcement (4) is partially or completely located in the precast concrete (1); one end of the additional steel bar (11) on the support is inserted into the support, and the other end is connected to the truss upper iron (3) and is wrapped by post-cast concrete (10).
5. The truss type composite floor concrete support according to claim 1, characterized in that: The floor slab reinforcement includes lower reinforcement; the lower reinforcement is lower floor slab longitudinal reinforcement (6) and / or lower floor slab transverse reinforcement (7); the lower reinforcement is connected to the additional reinforcement (12) under the support and is wrapped by post-cast concrete (10).
6. The truss type composite floor concrete support according to claim 1, characterized in that: One end of the additional steel bar (11) on the support is inserted into the support (B), and the other end is connected to the iron (3) on the truss; the support (B) is a beam or a wall; the support steel bar (13) of the beam includes beam stirrups and beam longitudinal bars; the support steel bar (13) of the wall includes wall longitudinal bars and wall transverse bars.
7. The truss type composite floor concrete support according to claim 1, characterized in that: The upper floor longitudinal reinforcement (8) and / or the upper floor transverse reinforcement (9) are inserted into the support (B).
8. The truss type composite floor concrete support according to claim 1, characterized in that: The reinforced truss precast concrete slab (A) has additional reinforcement; the additional reinforcement includes additional longitudinal reinforcement and / or additional transverse reinforcement; the additional reinforcement is partially or completely wrapped by the precast concrete (1); the additional longitudinal reinforcement is parallel to the truss lower reinforcement (4); one end of the additional reinforcement (12) under the support is inserted into the support, and the other end is connected to the additional reinforcement.
9. The truss type composite floor concrete support according to claim 1, characterized in that: The upper surface and end surface of the steel truss precast concrete slab (A) are rough surfaces.