A light steel and light concrete composite floor system

Abstract

The present invention discloses a light steel and light concrete composite floor system, belonging to the field of building technology. The present invention includes a light steel and strong concrete composite floor and a construction method of assembling the floor to form a floor and roof structure of a house. The composite floor is a lightweight concrete floor with a thin-walled steel frame. A special steel section that is very conducive to bearing load is formed by welding steel bars on the thin-walled steel. This special steel is used as the main load-bearing body of the composite floor, which can effectively improve the bending bearing capacity and rigidity of the floor, and can also use the same thin-walled steel to weld different steel bars to achieve different bearing capacity requirements; the floor or roof panel of the house is assembled from several composite floor panels, and the thin-walled steels at the edges of the composite floor are connected to each other to form an integral floor or roof structure that meets the requirements. In addition, the thin-walled steel at the edge of the panel can be conveniently and effectively connected to the main structure to form an assembled integral floor system.

Description

Technical Field

[0001] The invention relates to the technical field of construction, and in particular to a light steel and light concrete composite floor system. Background Art

[0002] Modernization of the construction industry is the development trend of my country's construction industry today. Industrialized production and prefabricated installation of building components are the basic requirements of modernization of the construction industry. Large bearing capacity and light weight are important research topics for floor structures. Lightweight means less earthquake effect, better seismic performance of building structures, and lower foundation costs. Prefabricated floor slabs used in building structures must be able to form reliable connections between prefabricated slabs and between floor slabs and main structures to meet the requirements of the integrity of the building floor structure and in-plane stiffness.

[0003] The existing floor slabs have the following deficiencies: 1) The bearing capacity can only be increased by changing the wall thickness or cross-sectional size of the thin-walled steel. According to basic mechanical principles, the above two methods are not the most effective methods, and thin-walled steel has stress buckling characteristics. The thinner the plate, the greater the loss of effective bearing capacity. The bearing capacity of steel cannot be fully utilized, resulting in a significant increase in steel consumption and increased costs. 2) Although existing similar prefabricated panels also use thin-walled steel frames, relatively thin-walled steel is prone to burn-through or over-burning during on-site installation. Existing welding technology is not easy to guarantee welding quality, and the reliability of floor slab connections is low. 3) Similar existing floor slabs require thin-walled steel of different thicknesses according to different stress requirements. It is necessary to produce thin-walled steel of many specifications to meet different stress requirements. The processing is complicated and the cost is high. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems in the prior art and provide a light steel and light concrete composite floor system.

[0005] The present invention provides a light steel and light concrete composite floor system, which is characterized by comprising a plurality of light steel and light concrete floor slabs, wherein the plurality of light steel and light concrete floor slabs are assembled to form a light steel and light concrete composite floor system; wherein each light steel and light concrete floor slab comprises

[0006] Two plate edge thin-walled steel sections, each plate edge thin-walled steel section comprises a thin-walled steel web, the top and bottom of the thin-walled steel web are fixed with flanges, and the intersection of the thin-walled steel web and the flange is fixed with steel bars; the two plate edge thin-walled steel sections are arranged relatively to form a steel frame, and the portion of the steel frame corresponding to the floor slab surface is a frame structure closed on all sides;

[0007] Lightweight concrete is poured within the steel frame and together with the two thin-walled steel sections on the edges of the slab forms a light steel and light concrete floor slab.

[0008] Furthermore, the thin-walled steel webs and flange junctions on both sides of the steel frame are connected to the steel bars by intermittent welds.

[0009] Furthermore, the lightweight concrete is provided with steel wires or steel meshes parallel to the slab surface near the two surfaces of the floor slab body.

[0010] Furthermore, the diameter of the steel bar is determined according to different bearing capacity and stiffness requirements.

[0011] Furthermore, adjacent light steel and light concrete floor slabs are interconnected by intermittent welding through adjacent thin-walled steel webs welded with steel bars. The welding requires that the thin-walled steel at the edge of the slab is directly welded through and then the steel bars are welded together.

[0012] Furthermore, the thin-walled steel sections at the edges of the light steel and light concrete floor slabs are reliably connected to the iron parts pre-embedded in the steel beams or concrete beams of the main structure by welding or bolts, forming a building structural system that meets the requirements as a whole.

[0013] Furthermore, the lightweight concrete cross section may also be in the form of a sandwich type, a hollow type or a channel type cross section.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The novel light steel and light concrete floor slab provided by the present invention is composed of a thin-walled steel frame welded with steel bars and a composite of light concrete. A special steel section that is very conducive to bearing load is formed by welding steel bars on thin-walled steel. This special steel section is used as the main load-bearing body of the composite floor slab, which can effectively improve the bending bearing capacity and rigidity of the floor slab. The same thin-walled steel section can be used to weld different steel bars to achieve different bearing capacity requirements. At the same time, the steel bars can be used as the welding connection body to conveniently and reliably realize the welding connection between the floor slabs and between the floor slabs and the main structure, thereby forming a rigid floor slab system with good integrity and reliability. Compared with the existing floor slabs, this floor slab has a more effective bearing capacity, saves steel, is easy to process, and is more conducive to promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an overall schematic diagram of the connection between the light steel and light concrete composite floor slab of the present invention and the main structure;

[0017] Figure 2 It is a schematic diagram of the light steel and light concrete floor slab of the present invention;

[0018] Figure 3 It is a structural schematic diagram of the plate edge thin-walled steel welded steel bars of the present invention;

[0019] Figure 4 This is a cross-sectional view of a thin-walled steel section with plate edges welded with steel bars according to the present invention;

[0020] Figure 5 This is a schematic diagram of the connection between two light steel and light concrete floor slabs of the present invention;

[0021] Figure 6 It is a schematic diagram of the connection between the light steel and light concrete floor slab of the present invention and the main structure;

[0022] Figure 7 It is the sandwich section form of the floor slab of the present invention;

[0023] Figure 8 It is the hollow section form of the floor slab of the present invention;

[0024] Fig. 9 It is the groove-shaped cross-section form of the floor slab of the present invention.

[0025] Description of reference numerals:

[0026] 1. Light steel and light concrete floor slab, 2. Thin-walled steel at the edge of the slab, 3. Lightweight concrete, 4. Steel bars, 5. Thin-walled steel web, 6. Flange, 7. Neutral axis of the cross section, 8. Steel wire or steel mesh, 9. Weld, 10. Main structure. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-9 , the specific implementation of the present invention is described in detail, but it should be understood that the protection scope of the present invention is not limited by the specific implementation. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] It comprises a plurality of light steel and light concrete floor slabs 1, wherein the plurality of light steel and light concrete floor slabs 1 are assembled to form a light steel and light concrete composite floor slab system; wherein each light steel and light concrete floor slab 1 comprises

[0029] Two plate edge thin-walled steel sections 2, each plate edge thin-walled steel section 2 includes a thin-walled steel web 5, the top and bottom of the thin-walled steel web 5 are fixed with flanges 6, and the intersection of the thin-walled steel web 5 and the flange 6 is fixed with steel bars 4; the two plate edge thin-walled steel sections 2 are arranged relatively to form a steel frame, and the portion of the steel frame corresponding to the floor slab surface is a frame structure closed on all sides;

[0030] Lightweight concrete 3 is poured in the steel frame and together with two thin-walled steel sections 2 at the edges of the slab forms a light steel and light concrete floor slab 1.

[0031] Preferably, the thin-walled steel web 5 and flange 6 at the plate edge on both sides of the steel frame are connected to the steel bars 4 by intermittent welds 9; two steel bars 4 are welded at the junction of the thin-walled steel web 5 and flange 6 on the two sides of the composite floor. By welding the steel bars 4, the mass of the steel section is concentrated on the side away from the neutral axis of the cross section, the cross-sectional bearing characteristics are better, and thinner steel sections can be used. At the same time, thin-walled steel sections with the same cross-sectional size can be used, or under the premise of using a certain plate thickness, different bearing capacity and stiffness requirements can be achieved by changing steel bars of different specifications.

[0032] Preferably, the lightweight concrete 3 is provided with steel wires or steel meshes 8 parallel to the slab surface near the two surfaces of the floor slab, so as to improve the crack resistance of the slab and further improve the bending bearing capacity of the floor slab.

[0033] Preferably, the diameter of the steel bar 4 is determined according to different bearing capacity and stiffness requirements. Since the composite floor slab edge adopts a steel section welded with steel bars with excellent force resistance, the bearing capacity is greatly improved, which can reduce the requirements for concrete. The requirements can be met by using lightweight concrete. Therefore, from the inherent characteristics of lightweight materials, it is known that the floor slab is lighter and has better thermal insulation and sound insulation properties.

[0034] Preferably, adjacent light steel and light concrete floor slabs 1 are interconnected by intermittent welding through adjacent thin-walled steel webs 5 welded with steel bars 4. Welding requires that the thin-walled steel 2 at the edge of the plate is directly welded through and then the steel bars 4 are welded together. Multiple light steel and light concrete floor slabs are assembled into a building floor structure. The floor slabs are interconnected by intermittent welding through adjacent thin-walled steel at the edge of the plate welded with steel bars. The welding points require that the thin-walled steel is directly welded through and then the steel bars are welded together to ensure the effectiveness of the connection. The assembled floor slabs or roof slabs can meet the requirements of the building structure system for the integrity of the floor structure.

[0035] Preferably, the thin-walled steel sections 2 at the edges of the light steel and light concrete floor slabs 1 are reliably connected to the iron parts pre-embedded in the steel beams or concrete beams of the main structure by welding or bolts, so as to form a house structural system that meets the requirements of integrity.

[0036] Preferably, the cross section of the lightweight concrete 1 can also be a sandwich type, a hollow type or a groove type cross section.

[0037] See attached Figure 1 As shown, it is a three-dimensional schematic diagram of the overall structure of the light steel and light concrete composite floor system of the present invention, which mainly includes a light steel and light concrete composite floor 1 and a building floor or roof structure system formed by assembling the composite floor.

[0038] See also Figure 2As shown, it is a three-dimensional schematic diagram of the structure of the lightweight lightweight concrete composite floor slab of this embodiment, including a frame formed by a C-shaped plate edge thin-walled steel 2, the left and right sides of the frame are covered by a thin-walled steel web 5, the upper and lower plate surfaces correspond to the frame closed on all sides, and the lightweight concrete 3 poured in the frame forms a light steel and light concrete floor slab 1. In order to ensure that the floor slab has sufficient bending bearing capacity, two steel bars 4 are welded on the thin-walled steel web 5 of the C-shaped plate edge thin-walled steel 2 on both sides of the lightweight floor slab. The thin-walled steel and the steel bars are combined to form a steel section with excellent bearing capacity. In addition, a steel wire or steel mesh 8 parallel to the plate surface is arranged near the concrete slab surface to improve the crack resistance of the floor slab and further improve the strength and rigidity of the floor slab.

[0039] See also Figure 3 , 4 As shown, it is a three-dimensional and cross-sectional schematic diagram of a plate edge thin-walled steel section welded with a C-shaped steel bar. Two steel bars 4 are welded by an intermittent weld 9 at the junction of the thin-walled steel web 5 and the flange 6 of the C-shaped plate edge thin-walled steel section 2. By welding the steel bars, the mass of the steel section is concentrated on the side away from the neutral axis 7 of the section. The cross-sectional bearing characteristics are better, and thinner steel sections can be used. At the same time, thin-walled steel sections 2 with the same cross-sectional size or under the premise of using a certain plate thickness can be used to achieve different bearing capacity and stiffness requirements by changing steel bars 4 of different specifications.

[0040] Preferably, since the C-shaped thin-walled steel edge 2 welded with steel bars has excellent bearing capacity, the requirements for floor concrete can be reduced, and lightweight concrete can meet the requirements. Therefore, from the inherent characteristics of lightweight materials, it is known that the floor is lighter and has better thermal insulation and sound insulation properties.

[0041] See also Figure 1 , 5 As shown, a plurality of light steel and light concrete floor slabs 1 are assembled into the floor structures of each part of the house. The floor slabs 1 are connected to each other by intermittent welding through adjacent C-shaped plate edge thin-walled steel sections 2 welded with steel bars. The welding points 9 require that the thin-walled steel sections are directly welded through, and then the steel bars 4 at the edges of the two plates are welded together to ensure the effectiveness of the connection. The floor slabs or roof panels thus assembled can meet the requirements of the house structural system for the integrity of the floor structure.

[0042] See also Figure 1 , 6 As shown, a C-shaped plate edge thin-walled steel 2 with steel bars is welded to the plate edge of a light steel and light concrete composite floor 1, and welding 9 is used to penetrate the C-shaped plate edge thin-walled steel to reliably connect the plate edge steel bars 4 with the steel beams of the main structure 10 or the pre-embedded iron parts of the concrete beams to form a house structural system that meets the requirements as a whole.

[0043] See also Figure 7-9As shown, light steel and light concrete composite floors are also suitable for sandwich, hollow or grooved cross-sections.

[0044] This embodiment is a new type of light steel and light concrete composite floor system. The floor system structure has a clear force mechanism, reasonable force, reliable connection with the main structure, good seismic performance, and is based on the national standard "Technical Code for Light Steel and Light Concrete Structures". It uses lightweight concrete, has light weight, and has excellent thermal insulation, heat insulation, and sound insulation properties.

[0045] The main technical features of the composite floor system of this embodiment are as follows:

[0046] 1. Due to the combined effect of steel bars, the thin-walled steel on the edge of the plate has more effective load-bearing, saves more steel, and has a lower cost. Different steel bars can be welded together with a thin-walled steel to achieve different load-bearing requirements. The floor slab is suitable for various types of building roof panels, floor panels, and other suitable uses.

[0047] 2. If Figure 4 As shown, from general mechanics knowledge, we know that the web part of the C-shaped steel section only contributes about 20% of the bending resistance, but accounts for about 50% of the steel consumption of the section. The C-shaped steel section welded with steel bars has concentrated mass arranged on the side away from the neutral axis. Compared with the traditional thin-walled steel section, the bearing capacity of this special section can be increased several times under the premise of the same steel consumption.

[0048] 3. Professional mechanics knowledge tells us that thin-walled steel is prone to local buckling problems, so the cross section cannot effectively bear all the loads. The effective load-bearing cross section of thin-walled steel is only 60%. To more effectively increase the bearing capacity, the wall thickness can only be increased. However, welded steel bars will not have local buckling problems. From this aspect, the bearing capacity of welded steel bars will be much better than that of traditional thin-walled steel.

[0049] 4. If Figure 5 , 6 As shown, due to the thin steel plate, it is generally not easy to ensure the welding quality with the commonly used welding methods during on-site installation and connection. The thin-walled steel with welded steel bars can be welded together by directly welding through the thin-walled steel with commonly used welding methods, which can meet the structural requirements for welding.

[0050] Compared with the floor slabs in the prior art, the composite floor slab of this embodiment has the following advantages:

[0051] 1. Compared with similar existing floor slabs, a special cross-section is formed by welding steel bars and thin-walled steel. This cross-section fundamentally solves some inherent mechanical deficiencies of thin-walled steel, has a greater and more effective load-bearing capacity, can use thinner profiles, save steel, and reduce construction costs.

[0052] 2. Compared with similar existing floors, the method of adjusting the bearing capacity of the floor slab is changed from changing the wall thickness or section height of the steel section to adjusting the size of the welded steel bars. A thin-walled steel section is used to form different bearing capacities by welding different types of steel bars. The types of thin-walled steel sections are reduced, the production technology and equipment are more streamlined, the production is simpler, and it is easy to promote and apply.

[0053] 3. Compared with the existing similar floor slabs, the steel bars welded to the thin-walled steel sections are used as the welding body required for the floor slab to be connected, which solves the technical problem that the thin-walled steel sections are not suitable for welding due to their thin walls, improves the reliability of the connection, and is more convenient for construction. At the same time, it provides a new technical solution for assembling integral floor slab structures.

[0054] 4. Compared with the existing reinforced concrete floor slabs, the load-bearing body of this floor slab is a group of thin-walled steel sections containing steel bars, which is completely different from the load-bearing method of concrete. It has very low requirements on the strength of concrete and can adopt various types of lightweight concrete currently available in the industry. The floor slab is lighter and easy to industrially produce and install in an assembled manner, which is in line with the current national policy requirements for vigorously developing the modernization of the construction industry and prefabricated buildings.

[0055] 5. The floor slab has high bearing capacity, is easy to install in an assembled manner, and has strong applicability. It can be used as various roofs and floor panels in house construction and other suitable purposes.

[0056] It should be noted that the cross-sectional form of the thin-walled steel in this embodiment is not limited to the above-illustrated type. As long as the cross-sectional form can form the above-mentioned characteristics after being welded with the steel bars, it belongs to the scope of this application.

[0057] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light steel and light concrete composite floor system, characterized in that: The invention comprises a plurality of light steel and light concrete floor slabs (1), wherein the plurality of light steel and light concrete floor slabs (1) are assembled to form a light steel and light concrete composite floor slab system; wherein each light steel and light concrete floor slab (1) comprises: Two plate edge thin-walled steel sections (2), each plate edge thin-walled steel section (2) comprises a thin-walled steel web (5), the top and bottom of the thin-walled steel web (5) are fixed with flanges (6), and the intersection of the thin-walled steel web (5) and the flange (6) is fixed with steel bars (4); the two plate edge thin-walled steel sections (2) are arranged relative to each other to form a steel frame, and the portion of the steel frame corresponding to the floor slab surface is a frame structure that is closed on all sides; The thin-walled steel webs (5) and flanges (6) on both sides of the steel frame are connected to the steel bars (4) by intermittent welds (9), and the steel bars (4) are welded together to concentrate the mass of the steel frame section on the side away from the neutral axis of the section; Lightweight concrete (3) is poured in the steel frame and together with two plate edge thin-walled steel sections (2) forms a light steel and light concrete floor slab (1).

2. The light steel and light concrete composite floor system according to claim 1, characterized in that: The lightweight concrete (3) is provided with steel wires or steel mesh sheets (8) parallel to the slab surface near the two surfaces of the floor slab body.

3. The light steel and light concrete composite floor system according to claim 1, characterized in that: The diameter of the steel bar (4) is determined according to different bearing capacity and stiffness requirements.

4. The light steel and light concrete composite floor system according to claim 1, characterized in that: Adjacent light steel and light concrete floor slabs (1) are connected to each other by intermittent welding through adjacent thin-walled steel webs (5) welded with steel bars (4). The welding requires that the thin-walled steel (2) at the edge of the slab is directly welded through and then the steel bars (4) are welded together.

5. The light steel and light concrete composite floor system according to claim 1, characterized in that: The thin-walled steel sections (2) at the edges of the light steel and light concrete floor slabs (1) are reliably connected to the pre-embedded iron parts of the steel beams or concrete beams of the main structure by welding or bolts, thereby forming a building structural system that meets the requirements of integrity.

6. The light steel and light concrete composite floor system according to claim 1, characterized in that: The cross section of the light steel and light concrete floor slab (1) is a sandwich type, a hollow type or a groove type.

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