Light steel framework foam concrete composite floor

Abstract

The light steel framework foam concrete composite floor slab comprises a light steel framework, at least two layers of alkali-resisting gridding cloth are arranged on the bottom face of the light steel framework, and grids of every two adjacent layers of alkali-resisting gridding cloth are arranged in a staggered mode; a first steel wire mesh is arranged on the bottom surface of the alkali-resistant gridding cloth on the lowermost layer, and a second steel wire mesh is arranged on the top surface of the light steel framework; the first steel wire mesh and the second steel wire mesh are welded with the light steel framework; foam concrete is filled between the first steel wire mesh and the second steel wire mesh. The light steel framework foam concrete composite floor slab provided by the invention solves the problem that a foam concrete floor slab in the prior art is easy to crack, and achieves the purposes of reducing the cracking risk of the foam concrete floor slab, improving the use stability and reducing the later maintenance difficulty.

Description

Technical Field

[0001] The invention relates to the field of building floors, and in particular to a light steel skeleton foam concrete composite floor. Background Art

[0002] According to the preparation process, concrete slabs can be divided into cast-in-place slabs and precast slabs. With the continuous development of prefabricated buildings, the quality requirements for precast concrete slabs are gradually increasing. Traditional precast concrete slabs are reinforced by a large number of built-in steel bars, which have the defects of being very easy to crack and having a large deadweight.

[0003] Foamed concrete, also known as foamed concrete, is a new type of concrete material containing a large number of closed pores formed by fully foaming the foaming agent mechanically, evenly mixing the foam with cement slurry, and then pouring it into place or forming it into a mold through the pumping system of the foaming machine, and curing it naturally. Foamed concrete has the advantages of light weight, heat preservation, sound insulation, and fire resistance, and has gradually been used in the production and preparation of concrete floor slabs. However, the concrete floor slabs prepared by foamed concrete in the prior art still have the problem of easy cracking, and this cracking does not only occur at the joints between the slabs, but may also occur inside and on the surface of the concrete floor slab itself, which undoubtedly brings great difficulties to the maintenance and maintenance of prefabricated buildings. Summary of the invention

[0004] The present invention provides a light steel skeleton foam concrete composite floor slab to solve the problem that foam concrete floors in the prior art are prone to cracking, thereby achieving the purpose of reducing the cracking risk of foam concrete floors, improving the use stability and reducing the difficulty of later maintenance.

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

[0006] A light steel frame foam concrete composite floor comprises a light steel frame, wherein at least two layers of alkali-resistant mesh cloth are arranged on the bottom surface of the light steel frame, and the meshes of two adjacent layers of alkali-resistant mesh cloth are arranged in a staggered manner; a first steel wire mesh is arranged on the bottom surface of the lowest layer of alkali-resistant mesh cloth, and a second steel wire mesh is arranged on the top surface of the light steel frame; the first steel wire mesh and the second steel wire mesh are both welded to the light steel frame; and foam concrete is filled between the first steel wire mesh and the second steel wire mesh.

[0007] In view of the problem that foam concrete floors are prone to cracking in the prior art, the present invention proposes a light steel frame foam concrete composite floor, which includes a light steel frame, a first steel wire mesh below the light steel frame, and a second steel wire mesh above the light steel frame; the present application sets at least two layers of alkali-resistant mesh cloth between the first steel wire mesh and the bottom surface of the light steel frame, and through the combined effect of the alkali-resistant mesh cloth and the first steel wire mesh, as well as the effect of the second steel wire mesh, the internal and surface cracking problems of the concrete floor itself can be significantly reduced, the service life of the foam concrete floor can be significantly improved, and the frequency and cost of its maintenance and upkeep can be reduced. In addition, the second steel wire mesh in the present application can be directly welded to the light steel frame, and the first steel wire mesh can be welded to the light steel frame through the mesh on the alkali-resistant mesh cloth. The present application also pours foam concrete between the first steel wire mesh and the second steel wire mesh, and the desired composite floor can be obtained after final setting. Among them, the staggered arrangement of the grids of any two adjacent layers of alkali-resistant mesh cloth means that the grids do not overlap and the grids are in different directions, 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 the present application only limits the alkali-resistant mesh cloth to the lower part of the light steel frame, which is a setting made after comprehensive consideration and the balance between production cost and crack resistance; if the crack resistance is to be further improved, the same alkali-resistant mesh cloth can also be set between the second steel wire mesh and the light steel frame. In addition, the alkali-resistant mesh cloth and foam concrete in the present application are both made of existing materials.

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

[0010] During the research process, the inventors found that cracks in the concrete floor slab itself are more likely to be concentrated at the bottom of the floor slab, which is determined by the stress distribution characteristics; based on this, the present solution will use a steel wire mesh structure with a coarser wire diameter and a denser mesh for the first steel wire mesh located at the bottom of the light steel frame, which can better overcome the stress concentration phenomenon at the bottom of the floor slab, make the bottom stronger, and further improve the crack resistance of the foam concrete floor slab.

[0011] Furthermore, the light steel frame includes a plurality of mutually perpendicular first steel sections and second steel sections; the first steel section has a first notch formed at the top, and the first steel section has a second notch formed at the side facing the first notch, and the first notch and the second notch are both matched with the second steel section; the bottom surface of the second steel section is placed on the inner bottom surface of the first steel section, and the top surface of the second steel section is at the same height as the top surface of the first steel section.

[0012] The traditional light steel frame, which is made of two groups of steel sections, generally uses the main steel purlins without processing and connects them by inserting the cuts of the secondary steel purlins. This traditional connection method firstly 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 steel beams below, with relatively weak bearing capacity and relatively 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 the light steel frame having more surfaces that need to be consolidated with concrete, which makes it more likely to dislocate and induce cracks under uneven force.

[0013] In order to overcome the above problems, the light steel frame of the present invention opens a first notch from the top of the first steel section and opens a second notch on the side of the first steel section, wherein the first notch and the second notch are opposite to each other, so as to facilitate the second steel section to enter the first notch and the second notch at the same time. The first notch and the second notch are matched with the second steel section, which means that the second steel section can enter the first notch and the second notch and fill the first notch and the second notch, and the sizes are matched with each other. When the light steel frame is formed in the present invention, the second steel section is directly placed inside the first steel section, and the top surface of the second steel section is equal to the top surface of the first steel section. Compared with the traditional light steel frame, the second steel section in the present application can extend to the other side of the first steel section, so the first steel section and the second steel section can be connected to the steel beam below, which significantly improves the bearing capacity and structural stability compared with the existing technology of connecting the steel beam only by the first steel section; in addition, since the present invention can make the top surface of the second steel section coplanar with the top surface of the first steel section, the concrete consolidation surface is significantly reduced, thereby reducing the risk of dislocation under uneven force, and further improving the crack resistance of the concrete floor.

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

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

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

[0017] The light steel frame in the prior art needs to rely on its own body to achieve the connection with the steel beam below, and the connection method is mostly welding, which will inevitably cause the stress distribution inside the light steel frame to change when it bears the upper load; and affected by the different technical levels of welders, it is easy to bring uncontrollable stress risks to the light steel frame. Based on this, the present scheme sets a connector at the end of the first steel and / or the second steel, so that the connector is partially nested in the corresponding first steel and / or the second steel; the connector is a C-shaped steel structure with a smaller size than the corresponding first steel and / or the second steel. The connector can be set only at the end of the first steel and / or the second steel that needs to be connected to the steel beam below, the connector is fixed to the corresponding first steel and / or the second steel, and then welded to the steel beam below through the connector, which can eliminate the interference of the internal stress distribution of the light steel frame due to the welding process and reduce the stress risk of the light steel frame.

[0018] Furthermore, a first threaded hole is arranged at the web of the connecting member, and a second threaded hole is arranged at the web of the end of the first steel section and / or the second steel section, and the first threaded hole corresponds to the second threaded hole one by one and matches each other.

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

[0020] Furthermore, the connecting piece is located on an outer wall at one end inside the first steel section and / or the second steel section, and has a plurality of connecting grooves; 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 toward the center direction of the connecting piece.

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

[0022] Furthermore, it also includes a placeholder block for inserting into the interior of the connecting piece, a baffle is set on the side of the placeholder block, and L-shaped bayonet is set on the upper and lower ends of the end of the placeholder block; the baffle matches the side opening of the connecting piece, and the L-shaped bayonet matches the upper and lower edges of the connecting piece.

[0023] During the prefabrication process of the floor slab of the present application, the connector needs to be fixed in advance. However, if the first threaded hole on the connector is also solidified by the foam concrete, it will be extremely difficult to replace the connector during the later installation. In addition, the connector is also related to the subsequent steps of splicing the floor slab. If the interior of the connector is filled with concrete, it will interfere with the subsequent splicing. In order to overcome the above problems, the present solution is also equipped with a placeholder block. Before pouring the foam concrete, the placeholder block is inserted into the corresponding connector so that the L-shaped bayonet at the upper end of the placeholder block clamps the upper edge of the connector and the L-shaped bayonet at the lower end of the placeholder block clamps the lower edge of the connector. At this time, the baffle is located exactly at the side notch of the connector, and the internal space of the connector is blocked by the placeholder block to prevent the foam concrete from entering the interior of the connector and interfering with the subsequent replacement or splicing.

[0024] Furthermore, it also includes a seam assembly for connecting between two connecting parts; the seam assembly includes a vertical plate, a positioning platform located on the top of the vertical plate, a first positioning strip located on the positioning platform, and two second positioning strips are arranged on both sides of the first positioning strip; the first positioning strip is located directly above the vertical plate, and the first positioning strip and the second positioning strip are perpendicular to each other.

[0025] If the connecting pieces are directly connected between two adjacent floor slabs of the present application, obvious joints will inevitably appear, which will easily cause cracks at the joints between the slabs. Based on this, the present solution uses a joint assembly to connect two adjacent floor slabs. The vertical plate of the joint assembly is vertically placed on the steel beam below and welded. The bottom plates of the connecting pieces on both sides are located on the steel beam and on both sides of the vertical plates respectively; the inner wall of the top plate of the connecting piece is in contact with the upper surface of the positioning platform, and the end of the top plate of the connecting piece is in contact with the side wall of the first positioning strip; at the same time, the second positioning strips on both sides respectively limit the connecting piece from both sides to limit the lateral displacement of the connecting piece and ensure the facing splicing of the floor slabs on both sides. Through the use of the joint assembly, the present solution can eliminate the longitudinal joint between two adjacent connecting pieces, and at the same time significantly improve the lateral stability of the floor slabs during splicing and reduce the difficulty of splicing.

[0026] Furthermore, a plurality of slide grooves are provided on the positioning platform, the axes of the slide grooves are parallel to the axes of the first positioning strips, and the second positioning strips are slidably fitted in the corresponding slide grooves;

[0027] The bottom of the second positioning bar is fixedly connected to the slider, the slider is hinged to the first transmission shaft, the end of the first transmission shaft away from the slider is hinged to the second transmission shaft, and the end of the second transmission shaft away from the first transmission shaft is connected to the driving block; the top surface of the positioning platform is provided with a mounting groove, the slider, the first transmission shaft and the second transmission shaft are all located in the mounting groove, and the second transmission shaft is rotatably connected to the groove wall of the mounting groove through the rotating shaft; the groove wall of the mounting groove has an arc-shaped portion that is always in contact with the driving block; and also includes a torsion spring connected to the rotating shaft;

[0028] When no external force is applied, the top surface height of the driving block is higher than the top surface height of the positioning platform;

[0029] When the driving block moves downward, the second positioning bar moves toward the center of the positioning platform.

[0030] Two slots are provided on both side end surfaces of the positioning platform away from the first positioning strip, and the two slots are used for inserting the side walls of the connector respectively; the slide slot and the mounting slot are both located between the ends of the slots and the first positioning strip.

[0031] In this solution, when the top plate of the connecting piece is placed on the positioning platform, its gravity and the load above are transmitted to the positioning platform, pressing the driving block down until it is completely inserted into 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 bar to slide along the slide groove and move toward the center of the positioning platform, thereby squeezing and clamping the connecting piece from both sides. This structure can utilize the deadweight of the floor slab to achieve stable clamping of the connecting piece, significantly improving the lateral stability of the connecting piece. At the same time, since the second positioning bars on both sides move inward synchronously, they also have the function of automatically calibrating and centering the connecting piece.

[0032] In addition, the present solution provides two slots to ensure access to both sides of the connector, so that the top plate of the connector can be placed on the positioning table; at the same time, the slide groove and the mounting 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. The light steel skeleton foam concrete composite floor slab of the present invention can significantly reduce the internal and surface cracking problems of the concrete floor slab itself, significantly improve the service life of the foam concrete floor slab, and reduce the frequency and cost of its maintenance and servicing through the combined effect of the alkali-resistant mesh cloth and the first steel wire mesh and the effect of the second steel wire mesh.

[0035] 2. The light steel skeleton foam concrete composite floor slab of the present invention can alleviate the stress concentration problem inside the foam concrete and more significantly improve the crack resistance of the floor slab.

[0036] 3. In a light steel skeleton foam concrete composite floor slab of the present invention, both the first steel section and the second steel section can be connected to the steel beam below, thereby improving the bearing capacity and structural stability; the top surface of the second steel section is coplanar with the top surface of the first steel section, thereby significantly reducing the concrete consolidation surface, thereby reducing the risk of dislocation under uneven force conditions, and further improving the crack resistance of the concrete floor slab.

[0037] 4. The light steel frame foam concrete composite floor slab of the present invention can eliminate the interference of the welding process on the stress distribution of the light steel frame and reduce the stress risk of the light steel frame through the connecting parts.

[0038] 5. The light steel skeleton foam concrete composite floor slab of the present invention can utilize the deadweight of the floor slab to realize stable clamping of the connecting parts, thus significantly improving the lateral stability of the connecting parts. 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 parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of 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 It is a plan view of a light steel frame in a specific embodiment of the present invention;

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

[0043] Figure 4 It is a partial schematic diagram of a light steel frame in a specific embodiment of the present invention;

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

[0045] Figure 6 It is a structural schematic diagram of a connecting member in a specific embodiment of the present invention;

[0046] Figure 7 It is a schematic diagram of the structure of a placeholder block in a specific embodiment of the present invention;

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

[0048] Fig. 9 It is a structural schematic diagram of a seam assembly in a specific embodiment of the present invention;

[0049] Fig.10 for Fig. 9 A partial enlarged view of the middle A;

[0050] Fig.11 It is a partial cross-sectional view of the joint assembly when no external force is applied in a specific embodiment of the present invention;

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

[0052] Marks and corresponding parts names in the attached drawings:

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

[0054] In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples and the accompanying drawings. The schematic embodiments of the present invention and the description thereof are only used to explain the present invention and are not intended to limit the present invention. In the description of the present 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", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying 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 limiting the scope of protection of the present application.

[0055] Embodiment 1:

[0056] like Figure 1 A light steel frame foam concrete composite floor slab shown in the figure comprises a light steel frame, 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 lowest 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.

[0057] 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 .

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

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

[0060] Embodiment 2:

[0061] A light steel frame foam concrete composite floor slab, based on Example 1, the light steel frame is as follows Figures 2 to 6 As shown, it includes a plurality of mutually perpendicular first steel sections 4 and second steel sections 5; the first steel section 4 has a first notch 6 formed from the top, and the first steel section 4 has a second notch 7 formed 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 inner bottom surface of 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.

[0062] 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.

[0063] 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 nested inside the first steel section 4 and / or the second steel section 5. A first threaded hole 9 is provided at the web of the connecting piece 8, and a second threaded hole 10 is provided at the web of the end of the first steel section 4 and / or the second steel section 5, and the first threaded hole 9 corresponds to the second threaded hole 10 one by one and matches each other.

[0064] 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 face of the connecting member 8; and along the axial direction of the connecting member 8, the depth of the connecting grooves 11 gradually decreases toward the center direction of the connecting member 8.

[0065] In a more preferred embodiment, a placeholder block 12 for inserting into the connecting member 8 is further included. The placeholder block 12 in this embodiment is as follows: Figure 7As shown, a baffle 13 is provided on its side, 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 and lower edges of the connecting piece 8.

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

[0067] Embodiment 3:

[0068] A light steel skeleton foam concrete composite floor slab, based on Example 2, as Figures 8 to 12 As shown, 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 bar 17 located on the positioning platform 16, and two second positioning bars 18 are arranged on both sides of the first positioning bar 17; the first positioning bar 17 is located directly above the vertical plate 15, and the first positioning bar 17 and the second positioning bar 18 are perpendicular to each other.

[0069] The positioning platform 16 is provided with a plurality of slide grooves 19, the axis of the slide groove 19 is parallel to the axis of the first positioning strip 17, and the second positioning strip 18 is slidably fitted in the corresponding slide groove 19;

[0070] The bottom of the second positioning bar 18 is fixedly connected to a slider 20, a first transmission shaft 21 is hinged on the slider 20, an end of the first transmission shaft 21 away from the slider 20 is hinged 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 through 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 also includes a torsion spring 26 connected to the rotating shaft 25.

[0071] When there is no external force, Fig.11 As 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 platform 16;

[0072] When the driving block 23 moves downward along the arc portion 27, Fig.12 As shown, the second positioning bar 18 moves toward the center of the positioning platform 16 .

[0073] 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 slide groove 19 and the mounting groove 24 are both located between the ends of the slots 28 and the first positioning strip 17 .

[0074] Embodiment 4:

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

[0076] 1. Preparation of light steel frame:

[0077] According to the designed light steel skeleton structure, a number of first steel sections 4 are prepared;

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

[0079] Prepare a plurality of second steel sections 5, and pass the second steel sections 5 through the first notches 6 and the second notches 7 on the corresponding first steel sections 4;

[0080] The first steel sections 4 and the second steel sections 5 are welded to obtain a light steel frame.

[0081] 2. Install the light steel frame lower structure:

[0082] Turn the light steel frame upside down so that the bottom of the light steel frame faces upwards;

[0083] Lay at least two layers of alkali-resistant mesh cloth 1 on the inverted light steel frame, and make the meshes of any two adjacent layers of alkali-resistant mesh cloth 1 staggered;

[0084] In this state, the first steel wire mesh 2 is laid on the topmost alkali-resistant mesh cloth 1, and the first steel wire mesh 2 is compacted;

[0085] According to the designed welding point position, the alkali-resistant mesh cloth 1 at the welding point is broken, and the first steel wire mesh sheet 2 and the light steel frame are welded.

[0086] 3. Install the light steel skeleton superstructure:

[0087] Turn over the light steel frame again to restore it to the bottom-down position;

[0088] The second steel wire mesh 3 is laid on the light steel frame, and the second steel wire mesh 3 and the light steel frame are welded.

[0089] 4. Set up a template between the first steel mesh 2 and the second steel mesh 3, and pour foam concrete; or, place the light steel skeleton together with the first steel mesh 2 and the second steel mesh 3 into a mold, and pour foam concrete;

[0090] Demoulding and maintenance.

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

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

[0093] Coat the surface of the placeholder block 12 with a release agent in advance, and insert the corresponding placeholder block 12 into each connector 8, so that the baffle 13 on the placeholder block 12 is located at the side notch of the connector 8, the L-shaped snap-in 14 at the upper end of the placeholder block 12 buckles the upper edge of the connector 8, and the L-shaped snap-in 14 at the lower end of the placeholder block 12 buckles the lower edge of the connector 8.

[0094] During the demoulding process, each placeholder 12 is pulled out.

[0095] Embodiment 5:

[0096] The method for using the light steel skeleton foam concrete composite floor slab described in any one of Examples 1 to 3 includes a method for connecting the floor slab and the beam, and a method for splicing the floor slab.

[0097] In this embodiment, the method for connecting the floor slab and the beam includes:

[0098] The portion of the connecting member 8 extending outside the first steel section 4 or the second steel section 5 is located on the steel beam 29;

[0099] Full welding is performed between the lower flange of the extended portion of the connector 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 joint assembly to the set position on the top of the steel beam 29;

[0102] Move the two floor slabs to be spliced ​​laterally from both sides, so that the connectors 8 on the two floor slabs enter the positioning platforms 16 on both sides of the first positioning strip 17 respectively, until the ends of the connectors 8 on both sides respectively abut the two sides of the first positioning strip 17. Specifically: the extended part of the connector 8 gradually reaches the top surface of the steel beam 29, and at the same time, the two sides of the connector 8 enter the two slots 28 respectively; as the top surface of the connector gradually enters the positioning platform 16, the driving block 23 is pressed down, so that the driving block 23 moves downward along the arc portion 27 of the groove wall of the installation groove 24. In this process, the second transmission shaft 22, the first transmission shaft 21 and the slider 20 form a crank slider mechanism, so that the second positioning strips 18 on both sides move inward and firmly abut against the side walls of the connector 8.

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

[0104] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

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

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 lowest 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).

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 light steel frame comprises a plurality of mutually perpendicular first steel sections (4) and second steel sections (5); 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 inner bottom surface of 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 3, characterized in that: 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).

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

7. The light steel skeleton foam concrete composite floor according to claim 5, 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 toward the center direction of the connecting member (8).

8. The light steel skeleton foam concrete composite floor according to claim 5, characterized in that: It also includes a placeholder (12) for inserting into the interior of the connecting piece (8), a baffle (13) is arranged on the side of the placeholder (12), and L-shaped bayonet (14) is arranged 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).

9. The light steel skeleton foam concrete composite floor according to claim 5, characterized in that: It also includes a joint assembly for connecting between two connecting members (8); the joint 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.

10. A light steel skeleton foam concrete composite floor according to claim 9, characterized in that: A plurality of slide grooves (19) are arranged 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 strip (18) is fixedly connected to a slider (20), the slider (20) is hinged to a first transmission shaft (21), one end of the first transmission shaft (21) away from the slider (20) is hinged to a second transmission shaft (22), and one 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) through 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 also includes 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).

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