A light steel framework foam concrete composite floor slab

Abstract

The present invention discloses a light steel skeleton foam concrete composite floor slab, which includes a light steel skeleton. At least two layers of alkali-resistant fiberglass meshes are arranged on the bottom surface of the light steel skeleton, and the meshes of adjacent two layers of alkali-resistant fiberglass meshes are arranged staggeredly. A first steel wire mesh is arranged on the bottom surface of the lowermost layer of alkali-resistant fiberglass mesh, and a second steel wire mesh is arranged on the top surface of the light steel skeleton. Both the first steel wire mesh and the second steel wire mesh are welded to the light steel skeleton. Foam concrete is filled between the first steel wire mesh and the second steel wire mesh. The present invention provides a light steel skeleton foam concrete composite floor slab to solve the problem that the foam concrete floor slab in the prior art is prone to cracking, and realizes the purpose of reducing the cracking risk of the foam concrete floor slab, improving the use stability and reducing the difficulty of later maintenance.

Description

Technical Field

[0001] The present invention relates to the field of building floors, and particularly to a light steel framework foam concrete composite floor slab. Background Art

[0002] According to the preparation process, concrete floor slabs can be divided into cast-in-place floor slabs and precast floor slabs. With the continuous development of prefabricated buildings, the quality requirements for precast concrete floor slabs have gradually increased. Traditional precast concrete floor slabs are strengthened by embedding a large number of steel bars, but they have the defects of being extremely prone to cracking and having a relatively large self-weight.

[0003] Foam concrete, also known as foamed concrete, is a new type of concrete material containing a large number of closed pores formed by mechanically foaming a foaming agent, uniformly mixing the foam with cement slurry, and then performing in-situ construction or mold forming through the pumping system of a foaming machine and natural curing. Foam concrete has the advantages of light weight, heat insulation, sound insulation, fire resistance, etc., and is gradually used in the production and preparation field of concrete floor slabs. However, the concrete floor slabs prepared with foam concrete in the prior art still have the problem of being prone to cracking, and this cracking does not only occur at the joints between slabs, but may also occur inside and on the surface of the concrete floor slab itself, which undoubtedly brings great difficulties to the maintenance of prefabricated buildings. Summary of the Invention

[0004] The present invention provides a light steel framework foam concrete composite floor slab to solve the problem that the foam concrete floor slab in the prior art is prone to cracking, and achieve the purposes of reducing the cracking risk of the foam concrete floor slab, improving the use stability, and reducing the difficulty of later maintenance.

[0005] The present invention is realized through the following technical solutions:

[0006] A light steel framework foam concrete composite floor slab includes a light steel framework. At least two layers of alkali-resistant fiberglass meshes are provided on the bottom surface of the light steel framework, and the meshes of adjacent two layers of alkali-resistant fiberglass meshes are arranged staggeredly; a first steel wire mesh is provided on the bottom surface of the lowermost layer of alkali-resistant fiberglass mesh, and a second steel wire mesh is provided on the top surface of the light steel framework; both the first steel wire mesh and the second steel wire mesh are welded to the light steel framework; foam concrete is filled between the first steel wire mesh and the second steel wire mesh.

[0007] In view of the problem that the foam concrete floor slab in the prior art is prone to cracking, the present invention proposes a light steel framework foam concrete composite floor slab, which includes a light steel framework. There is a first wire mesh under the light steel framework and a second wire mesh above the light steel framework. In this application, at least two layers of alkali-resistant mesh cloth are arranged between the first wire mesh and the bottom surface of the light steel framework. Through the combined action of the alkali-resistant mesh cloth and the first wire mesh, and the action of the second wire mesh, the internal and surface cracking problems of the concrete floor slab itself can be significantly reduced, the service life of the foam concrete floor slab can be significantly improved, and the frequency and cost of its maintenance and upkeep can be reduced. In addition, in this application, the second wire mesh can be directly welded to the light steel framework, and the first wire mesh can be welded to the light steel framework through the meshes on the alkali-resistant mesh cloth. This application also pours foam concrete between the first wire mesh and the second wire mesh, and the required composite floor slab can be obtained after final setting. Among them, the meshes of any two adjacent layers of alkali-resistant mesh cloth are arranged in a staggered manner, which means that the meshes do not overlap and the mesh orientations are different, which can reduce the stress concentration problem inside the foam concrete and more significantly improve the crack resistance of the floor slab.

[0008] It should be noted that in this application, the alkali-resistant mesh cloth is only limited under the light steel framework, which is set after comprehensively considering the balance between production cost and crack resistance performance; if the crack resistance performance is to be further improved, the same alkali-resistant mesh cloth can also be arranged between the second wire mesh and the light steel framework. In addition, the alkali-resistant mesh cloth and foam concrete in this application are both realized by using existing materials.

[0009] Furthermore, the wire diameter of the first wire mesh is greater than that of the second wire mesh; the mesh aperture of the first wire mesh is smaller than that of the second wire mesh.

[0010] During the research process, the inventor found that the cracks in the concrete floor slab itself are more likely to concentrate at the bottom of the floor slab, which is determined by the stress distribution characteristics; based on this, in this solution, the first wire mesh located at the bottom of the light steel framework uses a wire mesh structure with a thicker wire diameter and denser meshes, which can better overcome the stress concentration phenomenon at the bottom of the floor slab, make the bottom stronger, and more improve the crack resistance of the foam concrete floor slab.

[0011] Furthermore, the light steel framework includes a number of first steel profiles and second steel profiles that are perpendicular to each other; the first steel profile has a first notch opened from the top, and the first steel profile has a second notch opened from the side facing the first notch, and both the first notch and the second notch match the second steel profile; the bottom surface of the second steel profile is placed on the inner bottom surface of the first steel profile, and the top surface of the second steel profile is at the same height as the top surface of the first steel profile.

[0012] The traditional light steel skeleton composed of two groups of steel profiles generally does not process the main steel purlins, and the secondary steel purlins are connected by cutting and inserting methods; this traditional connection method first causes the secondary steel purlins to be unable to extend to the other side of the main steel purlins, and can only rely entirely on the main steel purlins to achieve connection with the lower steel beam, with relatively weak bearing capacity and insufficient structural stability; secondly, this traditional connection method will cause the top surface heights of the main steel purlins and the secondary steel purlins to be unequal, resulting in more surfaces of the light steel skeleton that need to be consolidated with concrete, and thus it is more likely to be misaligned and induce crack generation under uneven stress.

[0013] In order to overcome the above problems, the light steel skeleton of this solution opens a first notch at the top of the first steel profile and a second notch on the side of the first steel profile, where the first notch and the second notch are opposite to each other, so as to facilitate the second steel profile to enter the first notch and the second notch at the same time. The first notch and the second notch are both matched with the second steel profile, which means that the second steel profile can enter the first notch and the second notch and fill the first notch and the second notch, and they are matched in size. When forming the light steel skeleton in this solution, the second steel profile is directly placed inside the first steel profile, and the top surface of the second steel profile is at the same height as the top surface of the first steel profile. Compared with the traditional light steel skeleton, in this application, the second steel profile can extend to the other side of the first steel profile. Therefore, both the first steel profile and the second steel profile can be connected to the lower steel beam. Compared with the existing technology that only connects the steel beam through the first steel profile, the bearing capacity and structural stability are significantly improved; in addition, since this solution can make the top surface of the second steel profile coplanar with the top surface of the first steel profile, the concrete consolidation surface is significantly reduced, and thus the risk of misalignment under uneven stress is reduced, and the crack resistance of the concrete floor slab is further improved.

[0014] Furthermore, both the first steel profile and the second steel profile are C-shaped steel; the second notch is opened from the opening side of the C-shaped steel, and the bottoms of the first notch and the second notch are both at the same height as the inner bottom surface of the first steel profile.

[0015] Those skilled in the art should understand that the opening side in this application refers to the opening side of the C-shaped structure. In order to ensure the stable insertion of the second steel profile, the first notch can be considered as an inverted L-shaped notch. The bottoms of the first notch and the second notch are both at the same height as the inner bottom surface of the first steel profile to ensure that the load on the second steel profile is evenly and stably transmitted to the first steel profile.

[0016] Furthermore, it also includes a connector for connecting to the ends of the first steel profile and / or the second steel profile; the connector is a C-shaped steel that is partially nested inside the first steel profile and / or the second steel profile.

[0017] In the light steel framework in the prior art, the connection with the lower steel beam needs to be achieved by relying on its own body, and most of the connection methods adopt welding. This will inevitably cause the change of the stress distribution inside the light steel framework when it bears the upper load; and affected by the technical levels of different welders, it is easy to bring uncontrollable stress risks to the light steel framework. Based on this, in this solution, a connecting piece is arranged at the end of the first section steel and / or the second section steel, and the connecting piece is partially nested in the corresponding first section steel and / or second section steel; the connecting piece is a C-shaped steel structure with a smaller model size compared with the corresponding first section steel and / or second section steel. The connecting piece can be arranged only at the end of the first section steel and / or the second section steel that needs to be connected with the lower steel beam. The connecting piece is fixed to the corresponding first section steel and / or second section steel, and then welded with the lower steel beam through the connecting piece, so as to eliminate the interference of the welding process on the internal stress distribution of the light steel framework and reduce the stress risk of the light steel framework.

[0018] Further, a first threaded hole is arranged at the web of the connecting piece, and a second threaded hole is arranged at the web of the end of the first section steel and / or the second section steel. The first threaded holes and the second threaded holes correspond to each other one by one and are mutually matched.

[0019] In this solution, the connecting piece and the corresponding first section steel and / or second section steel are connected by bolts between the webs, which is convenient for installation, disassembly and replacement during the production process of the floor slab and during the installation process of the floor slab.

[0020] Further, a plurality of connecting grooves are opened on the outer wall of one end of the connecting piece located inside the first section steel and / or the second section steel; the connecting grooves are open from the end face of the connecting piece; and along the axial direction of the connecting piece, the depth of the connecting grooves gradually decreases towards the center direction of the connecting piece.

[0021] Since the connecting piece is partially nested inside the first section steel and / or the second section steel, one end of the connecting piece is located inside the first section steel and / or the second section steel and the other end is located outside the first section steel and / or the second section steel. In this solution, a plurality of connecting grooves located on the side wall of the connecting piece are opened at one end of the connecting piece located inside the first section steel and / or the second section steel, and the connecting grooves are open from the end face of the end of the connecting piece located inside the first section steel and / or the second section steel. Therefore, when pouring foamed concrete, the foamed concrete can enter each connecting groove, thereby increasing the consolidation area between the connecting piece and the corresponding first section steel and / or second section steel, improving the connection stability between the connecting piece and the first section steel and / or the second section steel, and reducing the bolt shear risk. In addition, the depth of the connecting grooves gradually decreases towards the center direction of the connecting piece, which is beneficial to the foamed concrete entering the connecting grooves to fully fill the inside of the connecting grooves and reduce the risk of voids inside the connecting grooves.

[0022] Further, it further includes a placeholder block for inserting into the interior of the connecting member. A baffle is provided on the side surface of the placeholder block, and L-shaped bayonets are provided at both the upper and lower ends of the end portion of the placeholder block; the baffle is matched with the side opening of the connecting member, and the L-shaped bayonets are respectively matched with the upper edge and the lower edge of the connecting member.

[0023] During the prefabrication process of the floor slab of the present application, it is necessary to fix the connecting member in advance. However, if the first threaded hole on the connecting member is also solidified by the foamed concrete, it will cause great difficulty in replacing the connecting member during subsequent installation; in addition, the connecting member is also related to subsequent steps such as splicing of the floor slab. If the interior of the connecting member is filled with concrete, it will interfere with subsequent splicing. To overcome the above problems, this solution is also equipped with a placeholder block. Before pouring the foamed concrete, the placeholder block is inserted into the corresponding connecting member, so that the L-shaped bayonet at the upper end of the placeholder block catches the upper edge of the connecting member, and the L-shaped bayonet at the lower end of the placeholder block catches the lower edge of the connecting member. At this time, the baffle is exactly located at the side notch of the connecting member, thereby blocking the interior space of the connecting member through the placeholder block to prevent the foamed concrete from entering the interior of the connecting member and interfering with subsequent replacement or splicing.

[0024] Further, it further includes a joint assembly for connecting between two connecting members; the joint assembly includes a vertical plate, a positioning table located at the top of the vertical plate, and a first positioning strip located on the positioning table. Two second positioning strips are provided on both sides of the first positioning strip; the first positioning strip is located directly above the vertical plate, and the first positioning strip is perpendicular to the second positioning strip.

[0025] Between two adjacent floor slabs of the present application, if the connecting members are directly butted, obvious joints will inevitably appear, resulting in easy cracking at the splicing position of the boards. Based on this, this solution uses a joint assembly to connect between two adjacent floor slabs. The vertical plate of the joint assembly is vertically placed on the lower steel beam and welded. The bottom plates of the two side connecting members are both located on the steel beam and are respectively located on both sides of the vertical plate; the inner wall of the top plate of the connecting member is in contact with the upper surface of the positioning table, and the end of the top plate of the connecting member abuts against the side wall of the first positioning strip; at the same time, the two second positioning strips on both sides respectively limit the connecting member from both sides to limit the lateral displacement of the connecting member and ensure the correct splicing of the two side floor slabs. By using the joint assembly in this solution, the longitudinal joint between two adjacent connecting members can be eliminated, and at the same time, the lateral stability during the splicing of the floor slab is significantly improved and the splicing difficulty is reduced.

[0026] Further, a plurality of sliding grooves are provided on the positioning table, the axis of the sliding groove is parallel to the axis of the first positioning strip, and the second positioning strip is slidably matched in the corresponding sliding groove;

[0027] The bottom of the second positioning strip is fixedly connected to a slider. A first transmission shaft is hinged to the slider. One end of the first transmission shaft away from the slider is hinged to a second transmission shaft. One end of the second transmission shaft away from the first transmission shaft is connected to a driving block. An installation groove is formed on the top surface of the positioning table. The slider, the first transmission shaft, and the second transmission shaft are all located in the installation groove. The second transmission shaft is rotationally connected to the groove wall of the installation groove through a rotating shaft. The groove wall of the installation groove has an arc portion that is always in contact with the driving block. A torsion spring connected to the rotating shaft is also included.

[0028] When there is no external force, the top surface height of the driving block is higher than the top surface height of the positioning table.

[0029] When the driving block moves downward, the second positioning strip moves towards the center direction of the positioning table.

[0030] On both end faces of the positioning table away from the first positioning strip, two slots are respectively formed for the two side walls of the connecting member to be inserted. The sliding groove and the installation groove are both located between the end of the slot and the first positioning strip.

[0031] In this solution, when the top plate of the connecting member is placed on the positioning table, its gravity and the load above are both transmitted to the positioning table, pressing the driving block down until it completely enters the installation groove. During the downward movement of the driving block, the crank-slider mechanism composed of the second transmission shaft, the first transmission shaft, and the slider drives the second positioning strip to slide along the sliding groove, and the second positioning strip moves towards the center direction of the positioning table, thereby squeezing and clamping the connecting member from both sides. This structure can utilize the self-weight of the floor slab to achieve stable clamping of the connecting member, significantly improving the lateral stability of the connecting member. At the same time, since the second positioning strips on both sides move inwards synchronously, it also has the function of automatically calibrating and centering the connecting member.

[0032] In addition, two slots are provided in this solution to ensure that both sides of the connecting member enter, so that the top plate of the connecting member can be placed on the positioning table; at the same time, the sliding groove and the installation groove will not interfere with the slots.

[0033] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0034] 1. For a light steel framework foam concrete composite floor slab of the present invention, through the combined action of the alkali-resistant fiberglass mesh and the first wire mesh, and the action of the second wire mesh, the internal and surface cracking problems of the concrete floor slab itself can be significantly reduced, the service life of the foam concrete floor slab can be significantly improved, and the frequency and cost of its maintenance and upkeep can be reduced.

[0035] 2. For a light steel framework foam concrete composite floor slab of the present invention, the stress concentration problem inside the foam concrete can be alleviated, and the crack resistance performance of the floor slab can be more significantly improved.

[0036] 3. In a lightweight steel framework foam concrete composite floor slab of the present invention, both the first steel section and the second steel section can be connected to the lower steel beam below, improving the bearing capacity and structural stability; the top surfaces of the second steel section and the first steel section are coplanar, thus significantly reducing the concrete consolidation surface, and further reducing the risk of dislocation under uneven stress, and further improving the crack resistance of the concrete floor slab.

[0037] 4. In a lightweight steel framework foam concrete composite floor slab of the present invention, the interference of the welding process on the stress distribution of the lightweight steel framework can be eliminated through the connecting piece, reducing the stress risk of the lightweight steel framework.

[0038] 5. In a lightweight steel framework foam concrete composite floor slab of the present invention, the stable clamping of the connecting piece can be achieved by using the self-weight of the floor slab, significantly improving the lateral stability of the connecting piece; at the same time, since the second positioning strips on both sides move inward synchronously, it also has the function of automatically calibrating and centering the connecting piece. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0040] Figure 1 is a cross-sectional view of a specific embodiment of the present invention;

[0041] Figure 2 is a plan view of the lightweight steel framework in a specific embodiment of the present invention;

[0042] Figure 3 is a partial schematic view of the first steel section in a specific embodiment of the present invention;

[0043] Figure 4 is a partial schematic view of the lightweight steel framework in a specific embodiment of the present invention;

[0044] Figure 5 is an installation schematic view of the connecting piece in a specific embodiment of the present invention;

[0045] Figure 6 is a structural schematic view of the connecting piece in a specific embodiment of the present invention;

[0046] Figure 7 is a structural schematic view of the placeholder block in a specific embodiment of the present invention;

[0047] Figure 8 is a partial cross-sectional view of the floor slab splicing in a specific embodiment of the present invention;

[0048] Figure 9 is a structural schematic view of the joint assembly in a specific embodiment of the present invention;

[0049] Figure 10 isFigure 9 Partial enlarged view at A in the middle;

[0050] Figure 11 It is a partial cross-sectional view of the joint assembly without external force in a specific embodiment of the present invention;

[0051] Figure 12 It is a partial cross-sectional view of the joint assembly when the driving block moves downward in a specific embodiment of the present invention.

[0052] Marks in the drawings and corresponding names of components:

[0053] 1 - alkali-resistant fiberglass mesh, 2 - first steel wire mesh, 3 - second steel wire mesh, 4 - first section steel, 5 - second section steel, 6 - first notch, 7 - second notch, 8 - connecting piece, 9 - first threaded hole, 10 - second threaded hole, 11 - connecting groove, 12 - occupying block, 13 - baffle plate, 14 - L-shaped bayonet, 15 - vertical plate, 16 - positioning table, 17 - first positioning strip, 18 - second positioning strip, 19 - sliding groove, 20 - slider, 21 - first transmission shaft, 22 - second transmission shaft, 23 - driving block, 24 - installation groove, 25 - rotating shaft, 26 - torsion spring, 27 - arc portion, 28 - slot, 29 - steel beam. Specific embodiments

[0054] To make the purpose, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with embodiments and drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and do not limit the present invention. In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "front", "rear", "left", "right", "up", "down", "vertical", "horizontal", "high", "low", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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, and therefore cannot be understood as a limitation on the protection scope of this application.

[0055] Embodiment 1:

[0056] As Figure 1 shown, a light steel framework foam concrete composite floor slab includes a light steel framework. At least two layers of alkali-resistant fiberglass meshes 1 are arranged on the bottom surface of the light steel framework, and the meshes of adjacent two layers of alkali-resistant fiberglass meshes 1 are arranged staggeredly; a first steel wire mesh 2 is arranged on the bottom surface of the lowermost layer of alkali-resistant fiberglass mesh 1, and a second steel wire mesh 3 is arranged on the top surface of the light steel framework; the first steel wire mesh 2 and the second steel wire mesh 3 are both welded to the light steel framework; foam concrete is filled between the first steel wire mesh 2 and the second steel wire mesh 3.

[0057] Among them, the wire diameter of the first wire mesh sheet 2 is greater than that of the second wire mesh sheet 3; the mesh aperture of the first wire mesh sheet 2 is smaller than that of the second wire mesh sheet 3.

[0058] In this embodiment, the wire diameter of the first wire mesh sheet 2 is 4 mm, and the wire diameter of the second wire mesh sheet 3 is 2.8 mm; both the first wire mesh sheet 2 and the second wire mesh sheet 3 are square meshes, and the side length of the mesh of the first wire mesh sheet 2 is 50 mm, and the side length of the mesh of the second wire mesh sheet 3 is 100 mm.

[0059] In this embodiment, the thickness of the single-layer alkali-resistant fiberglass mesh does not exceed 1 cm.

[0060] Embodiment 2:

[0061] A light steel framework foam concrete composite floor slab, on the basis of Embodiment 1, the light steel framework is as Figures 2 to 6 shown, including a number of mutually perpendicular first profiled steels 4 and second profiled steels 5; the first profiled steel 4 is provided with a first notch 6 from the top, and the first profiled steel 4 is provided with a second notch 7 from the side facing the first notch 6, and both the first notch 6 and the second notch 7 are matched with the second profiled steel 5; the bottom surface of the second profiled steel 5 is placed on the inner bottom surface of the first profiled steel 4, and the top surface of the second profiled steel 5 is at the same height as the top surface of the first profiled steel 4.

[0062] Both the first profiled steel 4 and the second profiled steel 5 are C-shaped steels; the second notch 7 is opened from the opening side of the C-shaped steel, and the bottoms of both the first notch 6 and the second notch 7 are at the same height as the inner bottom surface of the first profiled steel 4.

[0063] It further includes a connector 8 for connecting to the ends of the first profiled steel 4 and / or the second profiled steel 5; the connector 8 is a C-shaped steel partially nested inside the first profiled steel 4 and / or the second profiled steel 5. A first threaded hole 9 is provided at the web of the connector 8, and a second threaded hole 10 is provided at the web of the end of the first profiled steel 4 and / or the second profiled steel 5, and the first threaded hole 9 and the second threaded hole 10 correspond to each other and are mutually matched.

[0064] One end outer wall of the connector 8 located inside the first profiled steel 4 and / or the second profiled steel 5 is provided with a number of connecting grooves 11; the connecting grooves 11 are open from the end face of the connector 8; and along the axial direction of the connector 8, the groove depth of the connecting grooves 11 gradually decreases towards the center direction of the connector 8.

[0065] In a more preferred implementation manner, it further includes a placeholder block 12 for inserting into the inside of the connector 8. The placeholder block 12 in this embodiment is as Figure 7As shown, a baffle 13 is provided on its side, and L-shaped bayonets 14 are provided at both the upper and lower ends of the end of the placeholder block 12; the baffle 13 matches the side opening of the connecting member 8, and the L-shaped bayonets 14 match both the upper edge and the lower edge of the connecting member 8.

[0066] When the placeholder block 12 is assembled into the connecting member 8, the placeholder block 12 needs to at least block the first threaded hole 9 on the corresponding connecting member 8.

[0067] Embodiment 3:

[0068] A light steel framework foam concrete composite floor slab, on the basis of Embodiment 2, as Figures 8 to 12 shown, further includes a joint component for connecting between two connecting members 8; the joint component includes a vertical plate 15, a positioning table 16 located at the top of the vertical plate 15, and a first positioning strip 17 located on the positioning table 16. Two second positioning strips 18 are provided on both sides of the first positioning strip 17; the first positioning strip 17 is located directly above the vertical plate 15, and the first positioning strip 17 and the second positioning strip 18 are perpendicular to each other.

[0069] A plurality of sliding grooves 19 are provided on the positioning table 16, and the axis of the sliding groove 19 is parallel to the axis of the first positioning strip 17. The second positioning strip 18 is slidably fitted in the corresponding sliding groove 19;

[0070] The bottom of the second positioning strip 18 is fixedly connected to a slider 20. A first transmission shaft 21 is hinged to the slider 20. One end of the first transmission shaft 21 away from the slider 20 is hinged to a second transmission shaft 22. One end of the second transmission shaft 22 away from the first transmission shaft 21 is connected to a driving block 23; an installation groove 24 is provided on the top surface of the positioning table 16. The slider 20, the first transmission shaft 21 and the second transmission shaft 22 are all located in the installation groove 24. The second transmission shaft 22 is rotatably connected to the groove wall of the installation groove 24 through a rotating shaft 25; the groove wall of the installation groove 24 has an arc portion 27 that is always in contact with the driving block 23; it also includes a torsion spring 26 connected to the rotating shaft 25.

[0071] When there is no external force, as Figure 11 shown, under the action of the torsion spring 26, the top surface height of the driving block 23 is higher than the top surface height of the positioning table 16;

[0072] When the driving block 23 moves downward along the arc portion 27, as Figure 12 shown, the second positioning strip 18 moves towards the center direction of the positioning table 16.

[0073] On both side end faces of the positioning table 16 away from the first positioning strip 17, two slots 28 are respectively opened, and the two side walls of the connecting member 8 are respectively inserted into the two slots 28; the sliding groove 19 and the installation groove 24 are both located between the end of the slot 28 and the first positioning strip 17.

[0074] Embodiment 4:

[0075] A preparation method of a light steel skeleton foam concrete composite floor slab for preparing the composite floor slab in any one of the above embodiments, comprising the following steps:

[0076] I. Prepare a light steel skeleton:

[0077] According to the designed light steel skeleton structure, prepare a number of first profiled steels 4;

[0078] According to the designed light steel skeleton structure, cut out a first notch 6 and a second notch 7 on each first profiled steel 4,

[0079] Prepare a number of second profiled steels 5, and pass the second profiled steels 5 through the first notch 6 and the second notch 7 on the corresponding first profiled steels 4;

[0080] Weld each first profiled steel 4 and the second profiled steel 5 to obtain a light steel skeleton.

[0081] II. Install the lower structure of the light steel skeleton:

[0082] Turn the light steel skeleton upside down so that the bottom surface of the light steel skeleton faces upward;

[0083] Lay at least two layers of alkali-resistant fiberglass meshes 1 on the upside-down light steel skeleton, and make the meshes of any two adjacent alkali-resistant fiberglass meshes 1 staggered;

[0084] Lay a first steel wire mesh 2 on the topmost alkali-resistant fiberglass mesh 1 in this state, and compact the first steel wire mesh 2;

[0085] According to the designed welding point positions, break the alkali-resistant fiberglass mesh 1 at the welding points, and weld the first steel wire mesh 2 and the light steel skeleton.

[0086] III. Install the upper structure of the light steel skeleton:

[0087] Turn the light steel skeleton over again to reset it to the state with the bottom surface facing downward;

[0088] Lay a second steel wire mesh 3 on the light steel skeleton, and weld the second steel wire mesh 3 and the light steel skeleton.

[0089] IV. Set up a formwork between the first steel wire mesh 2 and the second steel wire mesh 3, and pour foam concrete; or, place the light steel skeleton together with the first steel wire mesh 2 and the second steel wire mesh 3 into a mold, and pour foam concrete;

[0090] Demolding and curing.

[0091] In a more preferred embodiment, before pouring the foamed concrete, it further includes:

[0092] Install the connecting piece 8 at the ends of the first section steel 4 and the second section steel 5, and fix the connecting piece 8 to the corresponding first section steel 4 and second section steel 5 through bolts;

[0093] Apply a demolding agent to the surface of the placeholder block 12 in advance, insert the corresponding placeholder block 12 into each connecting piece 8, so that the baffle 13 on the placeholder block 12 is located at the side notch of the connecting piece 8, the L-shaped bayonet 14 at the upper end of the placeholder block 12 buckles the upper edge of the connecting piece 8, and the L-shaped bayonet 14 at the lower end of the placeholder block 12 buckles the lower edge of the connecting piece 8.

[0094] During the demolding process, pull out each placeholder block 12.

[0095] Example 5:

[0096] Based on the usage method of the light steel framework foamed concrete composite floor slab described in any one of Examples 1 to 3, it includes the connection method between the floor slab and the beam and the floor slab splicing method.

[0097] In this embodiment, the connection method between the floor slab and the beam includes:

[0098] Make the part of the connecting piece 8 extending outside the first section steel 4 or the second section steel 5 sit on the steel beam 29;

[0099] Perform full welding operation between the lower flange of the extending part of the connecting piece 8 and the upper flange of the steel beam.

[0100] In this embodiment, the floor slab splicing method includes:

[0101] Vertically weld the vertical plate 15 in the splicing component at the set position on the top of the steel beam 29;

[0102] Horizontally move the two floor slabs to be spliced from both sides, so that the connecting pieces 8 on the two floor slabs respectively enter the positioning platforms 16 on both sides of the first positioning strip 17 until the end parts of the connecting pieces 8 on both sides respectively abut against both sides of the first positioning strip 17. Specifically: make the extending part of the connecting piece 8 gradually reach the top surface of the steel beam 29, and at the same time, the two sides of the connecting piece 8 respectively enter the two slots 28; as the top surface of the connecting piece gradually enters the positioning platform 16, press down the driving block 23, so that the driving block 23 moves downward along the arc part 27 of the inner wall of the installation groove 24. During this process, the second transmission shaft 22, the first transmission shaft 21 and the slider 20 form a crank-slider mechanism, so that the two second positioning strips 18 move inward and firmly abut against the side wall of the connecting piece 8.

[0103] Finally, weld the bottom of the connecting piece 8 to the steel beam 29 and weld the top of the connecting piece 8 to the first positioning strip 17.

[0104] The specific embodiments described above further elaborate on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only for the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0105] It should be noted that in this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including", or any other variant thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or device comprising a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. In addition, the term "connected" used in this text, without special explanation, can be directly connected or indirectly connected via other components.

Claims

1. A light steel skeleton foam concrete composite floor, characterized in that: The invention comprises a light steel frame, wherein at least two layers of alkali-resistant mesh cloth (1) are arranged on the bottom surface of the light steel frame, and the meshes of two adjacent layers of alkali-resistant mesh cloth (1) are arranged in a staggered manner; a first steel wire mesh (2) is arranged on the bottom surface of the bottom layer of alkali-resistant mesh cloth (1), and a second steel wire mesh (3) is arranged on the top surface of the light steel frame; the first steel wire mesh (2) and the second steel wire mesh (3) are both welded to the light steel frame; and foam concrete is filled between the first steel wire mesh (2) and the second steel wire mesh (3); The light steel frame comprises a plurality of first steel sections (4) and second steel sections (5) which are perpendicular to each other; It also includes a connecting piece (8) for connecting to the end of the first steel section (4) and / or the second steel section (5); the connecting piece (8) is a C-shaped steel partially embedded in the first steel section (4) and / or the second steel section (5); It also includes a seam assembly for connecting between two connecting members (8); the seam assembly includes a vertical plate (15), a positioning platform (16) located on the top of the vertical plate (15), and a first positioning strip (17) located on the positioning platform (16), and two second positioning strips (18) are arranged on both sides of the first positioning strip (17); the first positioning strip (17) is located directly above the vertical plate (15), and the first positioning strip (17) and the second positioning strip (18) are perpendicular to each other; A plurality of slide grooves (19) are provided on the positioning platform (16), the axes of the slide grooves (19) are parallel to the axes of the first positioning strips (17), and the second positioning strips (18) are slidably fitted in the corresponding slide grooves (19); The bottom of the second positioning bar (18) is fixedly connected to a slider (20), a first transmission shaft (21) is hingedly connected to the slider (20), an end of the first transmission shaft (21) away from the slider (20) is hingedly connected to a second transmission shaft (22), and an end of the second transmission shaft (22) away from the first transmission shaft (21) is connected to a driving block (23); a mounting groove (24) is provided on the top surface of the positioning platform (16), the slider (20), the first transmission shaft (21) and the second transmission shaft (22) are all located in the mounting groove (24), and the second transmission shaft (22) is rotatably connected to the groove wall of the mounting groove (24) via a rotating shaft (25); the groove wall of the mounting groove (24) has an arc-shaped portion (27) that is always in contact with the driving block (23); and further comprises a torsion spring (26) connected to the rotating shaft (25); When no external force is applied, the top surface height of the driving block (23) is higher than the top surface height of the positioning platform (16); When the driving block (23) moves downward, the second positioning bar (18) moves toward the center of the positioning platform (16); Two slots (28) are provided on both side end surfaces of the positioning platform (16) away from the first positioning strip (17), and the two slots (28) are respectively used for inserting the side walls of the connecting member (8); the sliding groove (19) and the mounting groove (24) are both located between the ends of the slots (28) and the first positioning strip (17).

2. A light steel skeleton foam concrete composite floor according to claim 1, characterized in that: The diameter of the steel wires of the first steel wire mesh (2) is greater than the diameter of the steel wires of the second steel wire mesh (3); and the mesh aperture of the first steel wire mesh (2) is smaller than the mesh aperture of the second steel wire mesh (3).

3. The light steel skeleton foam concrete composite floor according to claim 1, characterized in that: The first steel section (4) is provided with a first notch (6) from the top, and the first steel section (4) is provided with a second notch (7) from the side facing the first notch (6), and the first notch (6) and the second notch (7) are both matched with the second steel section (5); the bottom surface of the second steel section (5) is placed on the bottom surface inside the first steel section (4), and the top surface of the second steel section (5) is at the same height as the top surface of the first steel section (4).

4. A light steel skeleton foam concrete composite floor according to claim 3, characterized in that: The first steel section (4) and the second steel section (5) are both C-shaped steels; the second notch (7) is opened from the opening side of the C-shaped steel, and the bottom ends of the first notch (6) and the second notch (7) are both at the same height as the inner bottom surface of the first steel section (4).

5. The light steel skeleton foam concrete composite floor according to claim 1, characterized in that: A first threaded hole (9) is provided on the web of the connecting member (8), and a second threaded hole (10) is provided on the web of the end of the first section steel (4) and / or the second section steel (5), wherein the first threaded hole (9) and the second threaded hole (10) correspond one to one and match each other.

6. The light steel skeleton foam concrete composite floor according to claim 1, characterized in that: The connecting member (8) is located on an outer wall at one end inside the first steel section (4) and / or the second steel section (5), and is provided with a plurality of connecting grooves (11); the connecting grooves (11) are open from the end surface of the connecting member (8); and along the axial direction of the connecting member (8), the depth of the connecting grooves (11) gradually decreases towards the center direction of the connecting member (8).

7. The light steel skeleton foam concrete composite floor according to claim 1, characterized in that: It also includes a placeholder (12) for inserting into the interior of the connecting piece (8), a baffle (13) is provided on the side of the placeholder (12), and L-shaped bayonet (14) is provided at the upper and lower ends of the end of the placeholder (12); the baffle (13) matches the side opening of the connecting piece (8), and the L-shaped bayonet (14) matches the upper edge and the lower edge of the connecting piece (8).

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