Anti-cracking steel bar truss composite floor

Abstract

The utility model discloses an anti-cracking steel bar truss composite floor, and belongs to the technical field of building truss floors. The anti-cracking steel bar truss composite floor comprises a bottom die, a first concrete layer and a second concrete layer which are sequentially arranged from bottom to top, and a plurality of fixed sliding seats and steel bar supporting feet are fixed to the upper side of the bottom die in a welded mode; the prestressed steel wire bundles are arranged, a pre-tensioning method is adopted for stress tensioning, the tensile strength and the bearing capacity of the floor slab are remarkably enhanced, cracks and deformation are effectively reduced, the stability and the durability of the structure are improved, meanwhile, rapid installation of the steel truss is achieved through a simple fixing mode, and the construction efficiency is improved. In addition, by means of the arrangement of steel bar supporting feet and reinforced fibers, the thickness of a steel bar protection layer is ensured, stress distribution is optimized, the crack resistance of the floor is further enhanced, and the efficient, stable and reliable combined floor structure is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of building truss floors, in particular to a crack-proof steel truss composite floor slab. Background Technique

[0002] The steel truss floor slab is a high-performance floor slab, which takes steel bars as the main skeleton and is connected into a load-bearing plate by welding or binding. This kind of floor slab has the characteristics of light weight, high strength, good fire resistance, etc., and is widely used in various buildings. The steel truss floor slab is not only economical and efficient, with great spatial flexibility, but also has good anti-corrosion and weather resistance, providing a stable and reliable support structure for modern buildings.

[0003] Through in-depth research and analysis, we found that there are many deficiencies in the existing floor slabs or steel truss floor slabs in construction applications. Traditional floor slabs have weak tensile properties, are prone to cracks and deformations, thus reducing the structural stability and shortening the service life. At the same time, it is mostly difficult to ensure the thickness of the steel bar protection layer, which is easy to cause steel bar corrosion and concrete carbonization, resulting in the generation of expansion stress inside the concrete structure and the cracking of the concrete in the protection layer. These problems not only affect the overall quality and safety of the building, but also increase the later maintenance cost. Therefore, it is necessary to improve the deficiencies and defects of the existing technology. Content of the Utility Model

[0004] The purpose of the present utility model is to provide a crack-proof steel truss composite floor slab to solve the problems raised in the background technique.

[0005] In order to achieve the above purpose, the present utility model adopts the following technical solutions:

[0006] A crack-proof steel truss composite floor slab, comprising: a bottom mold, a first concrete layer, and a second concrete layer arranged in sequence from bottom to top. A plurality of fixed sliding seats and steel bar supporting feet are fixedly welded on the upper side of the bottom mold. The fixed sliding seats are arranged in parallel at both ends of the upper side of the bottom mold, and the steel bar supporting feet are arranged in a rectangular array between the fixed sliding seats at both ends. A plurality of steel trusses and prestressed steel wire bundles are fixedly arranged in sequence along the long side direction in the first concrete layer. A sliding block is fixedly welded at the bottom of the steel truss, and the sliding block is fixedly connected to the fixed sliding seat. A first steel bar grid and a second steel bar grid are fixedly arranged on the steel bar supporting feet from bottom to top by wire binding. The first steel bar grid is located in the first concrete layer, and the second steel bar grid is located in the second concrete layer. Reinforcing fibers are mixed in both the first concrete layer and the second concrete layer.

[0007] Furthermore, the sliding block is slidably connected to the inner side of the fixed sliding seat. Screw holes are arranged at both ends of the upper side of the fixed sliding seat, and the sliding block is threadedly connected and fixed to the screw holes on the fixed sliding seat through penetrating screws.

[0008] Further, the steel bar support feet include integrally formed U-shaped leg one, U-shaped leg two, and U-shaped bracket, and the U-shaped bracket is fixed to the upper part between U-shaped leg one and U-shaped leg two.

[0009] Further, the middle positions at the tops of the U-shaped leg one, U-shaped leg two, and U-shaped bracket are all bent into a concave shape. The U-shaped leg one and U-shaped leg two are used to support and fix the transverse steel bars on the first steel bar grid, and the U-shaped bracket is used to support and fix the longitudinal steel bars on the second steel bar grid.

[0010] Further, an alkali-resistant fiberglass mesh is arranged between the bottom formwork and the first concrete layer.

[0011] Further, a plurality of the prestressed steel wire bundles are fixedly connected in parallel to the bottom of the first concrete layer, and the prestressed steel wire bundles are stress-tensioned by the pre-tensioning method.

[0012] Further, the bottom formwork, the alkali-resistant fiberglass mesh, the first concrete layer and the components inside the first concrete layer together form the lower floor slab, and the second concrete layer and the second steel bar grid inside are the cast-in-place upper floor slab.

[0013] Compared with the prior art, the present utility model provides an anti-cracking steel bar truss composite floor slab, which has the following beneficial effects:

[0014] By arranging the prestressed steel wire bundles and stress-tensioning them by the pre-tensioning method, the present utility model significantly enhances the tensile strength and load-bearing capacity of the floor slab, effectively reduces the occurrence of cracks and deformations, improves the stability and durability of the structure. At the same time, the rapid installation of the steel truss is realized through a simple fixing method, improving the construction efficiency. In addition, by setting the steel bar support feet and the reinforcing fibers, the thickness of the steel bar protection layer is ensured, the stress distribution is optimized, and the anti-cracking ability of the floor slab is further enhanced, realizing an efficient, stable and reliable composite floor slab structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a partial sectional structural schematic diagram of an anti-cracking steel bar truss composite floor slab proposed by the present utility model;

[0016] Figure 2 FIG. is an internal structural schematic diagram of an anti-cracking steel bar truss composite floor slab proposed by the present utility model;

[0017] Figure 3 FIG. is a structural schematic diagram of the steel truss of an anti-cracking steel bar truss composite floor slab proposed by the present utility model;

[0018] Figure 4 FIG. is a structural schematic diagram of the fixed sliding seat of an anti-cracking steel bar truss composite floor slab proposed by the present utility model;

[0019] Figure 5Schematic diagram of the second steel bar grid structure of a crack - resistant steel bar truss composite floor slab proposed by the present utility model;

[0020] Figure 6 A crack - resistant steel bar truss composite floor slab proposed by the present utility model Figure 3 Schematic diagram of part A structure;

[0021] Figure 7 A crack - resistant steel bar truss composite floor slab proposed by the present utility model Figure 4 Schematic diagram of part B structure.

[0022] In the figure: 1. Bottom formwork; 2. Alkali - resistant fiberglass mesh; 3. Fixed sliding seat; 31. Screw hole; 4. Steel bar support feet; 41. First U - shaped leg; 42. Second U - shaped leg; 43. U - shaped support; 5. Steel truss; 51. Slide block; 52. Screw; 6. First steel bar grid; 7. Second steel bar grid; 8. Prestressed steel wire bundle; 9. First concrete layer; 10. Second concrete layer. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present utility model. Embodiment 1:

[0025] Refer to Figures 1-7 , a crack - resistant steel bar truss composite floor slab, including: a bottom formwork 1, a first concrete layer 9, and a second concrete layer 10 arranged in sequence from bottom to top. A number of fixed sliding seats 3 and steel bar support feet 4 are fixedly welded on the upper side of the bottom formwork 1. The fixed sliding seats 3 are arranged in parallel at both ends on the upper side of the bottom formwork 1, and the steel bar support feet 4 are arranged in a rectangular array between the fixed sliding seats 3 at both ends. A number of steel trusses 5 and prestressed steel wire bundles 8 are fixedly arranged in sequence along the long - side direction in the first concrete layer 9. A slide block 51 is fixedly welded at the bottom of the steel truss 5, and the slide block 51 is fixedly connected to the fixed sliding seat 3. On the steel bar support feet 4, a first steel bar grid 6 and a second steel bar grid 7 are fixedly arranged in sequence from bottom to top by wire binding. The first steel bar grid 6 is located in the first concrete layer 9, and the second steel bar grid 7 is located in the second concrete layer 10. Reinforcing fibers are mixed in both the first concrete layer 9 and the second concrete layer 10.

[0026] As shown Figure 6 in FIG. 1, the slider 51 is slidably connected to the inside of the fixed slide base 3. Screwed holes 31 are provided at both ends of the upper side of the fixed slide base 3. The slider 51 is fixedly connected to the screwed holes 31 on the fixed slide base 3 through the penetrating screws 52.

[0027] As shown Figure 7 in FIG. 2, the steel bar support 4 includes integrally formed U-shaped leg one 41, U-shaped leg two 42, and U-shaped bracket 43. The U-shaped bracket 43 is fixed to the upper part between the U-shaped leg one 41 and the U-shaped leg two 42.

[0028] As shown Figure 5 and Figure 7 in FIG. 3, the middle positions at the tops of the U-shaped leg one 41, the U-shaped leg two 42, and the U-shaped bracket 43 are all bent into a concave shape. The U-shaped leg one 41 and the U-shaped leg two 42 are used to support and fix the transverse steel bars on the steel bar grid one 6, and the U-shaped bracket 43 is used to support and fix the longitudinal steel bars on the steel bar grid two 7. Embodiment 2:

[0029] The difference between this embodiment and Embodiment 1 is that:

[0030] An alkali-resistant fiberglass mesh 2 is arranged between the bottom mold 1 and the first concrete layer 9;

[0031] As shown Figure 1 in FIG. 4, when the concrete is subjected to external forces, it is prone to cracks and deformations. The alkali-resistant fiberglass mesh 2 can effectively enhance the tensile capacity of the concrete, prevent the concrete from cracking and being damaged, thereby improving the stability and durability of its overall structure. At the same time, the alkali-resistant fiberglass mesh 2 can improve the tensile and compressive capacities of the concrete, optimize the stress distribution, extend the service life, and reduce the maintenance cost.

[0032] A number of prestressed steel wire bundles 8 are fixedly connected in parallel to the bottom of the first concrete layer 9, and the prestressed steel wire bundles 8 are stressed and tensioned by the pre-tensioning method;

[0033] As shown Figure 2 in FIG. 5, the pre-tensioning method adopted by the prestressed steel wire bundles 8 is an existing construction technology, that is, during the construction process, the prestressed steel wire bundles 8 are first tensioned to the design stress on the tensioning bed, and then the first concrete layer 9 is poured. After the concrete reaches the design strength, the tension is released, so that the prestressed steel wire bundles 8 generate pre-compressive stress; the prestressed steel wire bundles 8 can significantly enhance the tensile strength and bearing capacity of the concrete in the concrete structure, optimize the stress distribution, reduce cracks and deformations, and improve the stability and durability of the concrete structure.

[0034] The bottom mold 1, the alkali-resistant fiberglass mesh 2, the first concrete layer 9 and the components inside the first concrete layer 9 together form the lower floor slab, and the second concrete layer 10 and the internal steel bar grid two 7 are the later-cast upper floor slab.

[0035] Working principle: When the utility model is in use, the lower floor slab is produced first. The specific process is as follows. First, the fixed sliding seats 3 and the steel bar support feet 4 are welded and fixed in an orderly manner on the upper side of the bottom mold 1, and the sliding blocks 51 are welded and fixed at the corresponding positions at the bottom of the lower chord bars of the steel truss 5. As shown in Figure 6 shown, when installing the steel truss 5, only need to align the sliding block 51 at the bottom of the steel truss 5 with the fixed sliding seat 3 and insert it. Subsequently, by using the threaded connection relationship between the screw 52 and the screw hole 31, the rapid fixation of the steel truss 5 on the bottom mold 1 can be completed. The whole fixation method is simple and fast, greatly improving the installation efficiency. As shown in Figure 7 shown, then the transverse steel bars on the steel bar grid 1 are tied and fixed with steel wires at the U-shaped legs 41 and U-shaped legs 42 of the steel bar support feet 4. This process effectively ensures the steel bar protection layer thickness of the steel bar grid 1 in the concrete layer 1. Then, the prestress tension of the prestressed steel wire bundle 8 and the pouring of the concrete layer 1 are successively completed. After the concrete layer 1 is cured and formed, the production of the lower layer of concrete is completed;

[0036] The lower layer of concrete is transported to the designated construction site. At this time, the upper part of the steel truss 5 and the U-shaped brackets 43 on the steel bar support feet 4 are all exposed on the upper surface of the concrete layer 1. Subsequently, the steel bar grid 2 is fixedly tied to the U-shaped brackets 43, effectively ensuring the steel bar protection layer thickness of the steel bar grid 2 in the concrete layer 2. Here, through the setting of the steel bar support feet 4, the bonding and anchoring effect between the steel bars and the concrete can be maintained, preventing the steel bars from rusting and the concrete from carbonizing, avoiding the cracking and peeling of the protective layer concrete due to the expansion stress generated inside the concrete structure, and effectively realizing the anti-cracking function. Secondly, the reinforcing fibers incorporated in the concrete layer 1 and the concrete layer 2 can significantly improve the anti-cracking ability of the floor slab. Common reinforcing fibers include steel fibers, glass fibers, polypropylene fibers, basalt fibers, etc. These fibers can be evenly distributed in the concrete, optimize the stress distribution, enhance the toughness of the concrete, and improve the structural stability and durability.

Claims

1. A crack-resistant steel bar truss composite floor slab, comprising: A bottom mold (1), a first concrete layer (9), and a second concrete layer (10) are arranged successively from bottom to top. It is characterized in that a plurality of fixed sliding seats (3) and steel bar supporting feet (4) are fixedly welded on the upper side of the bottom mold (1). The fixed sliding seats (3) are arranged in parallel at both ends of the upper side of the bottom mold (1). The steel bar supporting feet (4) are arranged in a rectangular array between the fixed sliding seats (3) at both ends. A plurality of steel trusses (5) and prestressed steel wire bundles (8) are successively fixed in the first concrete layer (9) along the long side direction. The bottom of the steel truss (5) is fixedly welded with a slider (51). The slider (51) is fixedly connected in the fixed sliding seat (3). On the steel bar supporting feet (4), a first steel bar grid (6) and a second steel bar grid (7) are successively fixed by wire binding from bottom to top. The first steel bar grid (6) is located in the first concrete layer (9), and the second steel bar grid (7) is located in the second concrete layer (10).

2. The anti-cracking steel bar truss composite floor slab according to claim 1, wherein, The slider (51) is slidably connected to the inner side of the fixed sliding seat (3). Screw holes (31) are provided at both ends of the upper side of the fixed sliding seat (3). The slider (51) is fixedly connected to the screw holes (31) on the fixed sliding seat (3) by a penetrating screw (52).

3. The crack-resistant steel bar truss composite floor according to claim 1, characterized in that, The steel bar supporting feet (4) include integrally formed U-shaped legs one (41), U-shaped legs two (42), and a U-shaped bracket (43). The U-shaped bracket (43) is fixed on the upper part between the U-shaped legs one (41) and the U-shaped legs two (42).

4. The anti-cracking steel bar truss composite floor according to claim 3, characterized in that, The middle positions at the tops of the U-shaped legs one (41), the U-shaped legs two (42), and the U-shaped bracket (43) are all bent into a concave shape. The U-shaped legs one (41) and the U-shaped legs two (42) are used to support and fix the transverse steel bars on the first steel bar grid (6), and the U-shaped bracket (43) is used to support and fix the longitudinal steel bars on the second steel bar grid (7).

5. The anti-cracking steel bar truss composite floor slab according to claim 1, characterized in that, An alkali-resistant fiberglass mesh (2) is arranged between the bottom mold (1) and the first concrete layer (9).

6. The anti-cracking steel bar truss composite floor slab according to claim 1, wherein, A plurality of the prestressed steel wire bundles (8) are fixedly connected in parallel to the bottom of the first concrete layer (9). The prestressed steel wire bundles (8) are stressed and tensioned by the pre-tensioning method.

7. A crack-resistant steel bar truss composite floor according to claim 1, characterized in that, The bottom mold (1), the alkali-resistant fiberglass mesh (2), the first concrete layer (9), and the components in the first concrete layer (9) together form the lower floor slab. The second concrete layer (10) and the second steel bar grid (7) inside are the post-cast upper floor slab.

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