Single steel plate concrete composite structure and its construction method

Abstract

The present invention discloses a single steel plate concrete composite structure and a construction method thereof. The single steel plate concrete composite structure includes: upper layer main reinforcement bars; a bottom steel plate located directly below the upper layer main reinforcement bars; a plurality of hook connection components respectively and fixedly arranged at intervals on the top end of the bottom steel plate; a plurality of soft connection type tie bars each having a deformation ability; the bottom end of each soft connection type tie bar is hung on a hook connection component, and the top end of each soft connection type tie bar is wound and positioned on the upper layer main reinforcement bars; a concrete layer, and the upper layer main reinforcement bars, the bottom steel plate, the hook connection components and the soft connection type tie bars are respectively poured inside the concrete layer; when the concrete layer is subjected to an external impact force, the soft connection type tie bars within the impact area are deformed to prevent the impact load from being directly transmitted to the bottom steel plate. The present invention not only meets the structural design requirements, but also can improve the impact load resistance ability of the single steel plate concrete in terms of structural layout, is convenient for on-site construction, and is suitable for modular construction.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, and particularly to a single steel plate concrete composite structure and a construction method thereof. Background Art

[0002] The single steel plate concrete composite structure can usually be used as a floor slab or a roof slab. Compared with the ordinary reinforced concrete structure, the single steel plate concrete composite structure has the following advantages: the bottom steel plate and the concrete are combined to bear the load, which can significantly improve the bearing capacity, ductility and anti-explosion impact resistance of the component; the bottom steel plate has isotropic tensile capacity and is suitable for special-shaped irregular components; the bottom steel plate can also be used as a concrete formwork, simplifying the on-site formwork support process.

[0003] For nuclear power plants, important industrial plants and civil air defense structures, the tie bars play a role in resisting the impact of flying objects while solving the out-of-plane shear resistance of the thick roof slab. The traditional single steel plate tie bar type is to weld the lower part of the existing tie bar 5 to the bottom steel plate 1 of the roof slab and hook the upper part to the upper main reinforcement 4, as Figure 1 shown. When the roof slab is relatively thick, the construction is very difficult. When constructing the upper steel bar mesh, the upper horizontal and vertical steel bars need to pass through the upper hooks of the tie bars during layout, and the upper hooks of the tie bars are arranged densely. The dense vertical tie bars make it impossible to bind the upper longitudinal steel bars of the roof slab, resulting in certain difficulties in constructing the upper steel bars and slowing down the construction progress. At the same time, under the impact of flying objects, the tie bars in the impact area will directly transfer the load to the single steel plate at the bottom of the roof slab, causing the steel plate to be broken and affecting the anti-impact ability of the entire mesh system of the roof slab. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of difficult construction and poor anti-impact ability existing in the traditional single steel plate tie bar type, so as to provide a single steel plate concrete composite structure and a construction method thereof, to improve the anti-impact load ability of the single steel plate concrete, facilitate on-site construction, and be suitable for modular construction.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0006] The single steel plate concrete composite structure includes:

[0007] Upper main reinforcements, fixedly arranged on the peripheral walls of the plant or civil air defense structure;

[0008] Bottom steel plates, located directly below the upper main reinforcements and fixedly arranged on the peripheral walls of the plant or civil air defense structure;

[0009] A plurality of hooking components, respectively and fixedly arranged at intervals on the top end of the bottom steel plate;

[0010] A number of soft-connected tension bars, each having a deformation ability; the bottom end of each said soft-connected tension bar is hooked to a hooking component, and the top end of each said soft-connected tension bar is wound and positioned on the upper main reinforcement;

[0011] A concrete layer, the upper main reinforcement, the bottom steel plate, the hooking component and the soft-connected tension bars are respectively poured inside the concrete layer; when the concrete layer is subjected to an external impact force, the soft-connected tension bars within the impact area are deformed to prevent the impact load from being directly transmitted to the bottom steel plate.

[0012] Optionally, the soft-connected tension bar is a chain-type tension bar; the chain-type tension bar includes a number of chain links that are sequentially buckled.

[0013] Optionally, the material of the chain-type tension bar is metal.

[0014] Optionally, the hooking component is an inverted J-shaped stud fixedly arranged at the top end of the bottom steel plate, and the chain link at the bottom of the chain-type tension bar is hooked to the hook of the inverted J-shaped stud.

[0015] Optionally, the upper main reinforcement includes:

[0016] A number of horizontal reinforcements, which are respectively arranged in parallel at intervals;

[0017] A number of longitudinal reinforcements, which are respectively arranged in parallel at intervals and fixedly arranged on the horizontal reinforcements; a rectangular frame is formed between two adjacent horizontal reinforcements and two adjacent longitudinal reinforcements, and the chain-type tension bar is wound around the corners of the rectangular frame.

[0018] A construction method for a single-steel-plate concrete composite structure, comprising the following steps:

[0019] S1. Factory processing stage:

[0020] Precast the upper main reinforcement, the bottom steel plate, the hooking component, and the soft-connected tension bars, and weld each hooking component to the bottom steel plate at intervals;

[0021] S2. On-site construction stage:

[0022] Fix the upper main reinforcement and the bottom steel plate to the surrounding walls of the factory building or the civil air defense structure, and make the bottom steel plate be directly below the upper main reinforcement;

[0023] Hook the bottom of each soft-connected tension bar to the hooking component, and wind and position the top to the upper main reinforcement;

[0024] Pour concrete into the assembled upper main reinforcement, bottom steel plate, hooking component, and soft-connected tension bars.

[0025] Optionally, the thickness of the underlying steel plate, the diameter of the upper main reinforcement, and the diameters, lengths, and arrangement spacings of the hook connection components and the soft-connected tie bars are determined by finite element analysis.

[0026] The technical solution of the present invention has the following advantages:

[0027] 1. The single steel plate concrete composite structure provided by the present invention is applied to nuclear power plant buildings, important industrial buildings, and civil air defense structures. It not only meets the structural design requirements but also improves the ability of the single steel plate concrete to resist impact loads in terms of structural layout. The structure is simple, the design is reasonable, it is convenient for on-site construction, and it is suitable for modular construction.

[0028] 2. In the single steel plate concrete of the single steel plate concrete composite structure provided by the present invention, soft-connected tie bars are provided, and hook connection components are welded on the underlying steel plate. Hooks are formed through the hook connection components and the soft-connected tie bars. The soft-connected tie bars do not need to be welded to the underlying steel plate, and the soft-connected tie bars are wound and connected to the upper main reinforcement for fixation. When the thickness of the single steel plate roof slab is large, it solves the interference of the traditional welded tie bars standing vertically on the upper reinforcement binding, making the upper construction simple and efficient, meeting the requirements of modular construction, and being convenient for construction. At the same time, while ensuring the rationality of the structural design, the present invention improves the impact resistance of the components. When the concrete layer of the roof slab is impacted by external flying objects, the soft-connected tie bars in the impact area are deformed, avoiding the direct transfer of the impact load of the soft-connected tie bars in the impact area to the underlying steel plate on the back, and it is not easy to cause concentrated penetration damage to the underlying steel plate, effectively improving the impact resistance of the single steel plate concrete structure.

[0029] 3. For the construction method of the single steel plate concrete composite structure provided by the present invention, the upper main reinforcement, the underlying steel plate, the hook connection components, and the soft-connected tie bars can be directly processed and prefabricated in the factory. At the installation site, only the soft-connected tie bars need to be sleeved into the inverted J-shaped studs at the bottom and then tied to the upper main reinforcement. The work difficulty can be reduced during both the factory processing and on-site construction stages, and the construction progress can be improved. Compared with the traditional construction method, the production and installation process of the present invention is more convenient, the welding process is reduced, and modular construction can also be optimized. Modular technology plays a significant role in improving construction quality, shortening the construction period, reducing labor input, and improving efficiency. Description of the Drawings

[0030] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 Schematic diagram of the structure of the traditional single steel plate tension bar type

[0032] Figure 2 Schematic diagram of the structure of the single steel plate concrete composite structure of the present invention

[0033] Figure 3 Partial schematic diagram of the structure of the single steel plate concrete composite structure of the present invention

[0034] Reference numerals: 1, bottom steel plate; 2, inverted J-shaped stud; 3, soft-connected tension bar; 4, upper main reinforcement; 5, existing tension bar Detailed implementation manners

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "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 of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance

[0037] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations

[0038] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other

[0039] As Figure 2 and Figure 3 shown, a specific implementation manner of the single steel plate concrete composite structure includes an upper main reinforcement 4, a bottom steel plate 1, a hook connection assembly, and a soft-connected tension bar 3

[0040] The upper main reinforcement bars 4 are fixedly arranged on the peripheral walls of the factory building or civil air defense structure. Specifically, both ends of the upper main reinforcement bars 4 on the ground floor are anchored into the peripheral walls of the factory building.

[0041] The bottom steel plate 1 is located directly below the upper main reinforcement bars 4 and is fixedly arranged on the peripheral walls of the factory building or civil air defense structure.

[0042] A number of hook connection components are provided and are respectively fixedly arranged at intervals on the top end of the bottom steel plate 1.

[0043] A number of soft connection type tension bars are provided, each having a certain deformation ability, that is, it can deform under the action of impact load. The bottom end of each soft connection type tension bar is hung on a hook connection component, and the top end of each soft connection type tension bar is wound and positioned on the upper main reinforcement bars 4.

[0044] The upper main reinforcement bars 4, the bottom steel plate 1, the hook connection components and the soft connection type tension bars are respectively poured inside the concrete layer.

[0045] In the above single steel plate concrete composite structure, soft connection type tension bars are arranged inside the single steel plate concrete. At the same time, hook connection components are welded on the bottom steel plate 1. The hook connection is formed between the hook connection components and the soft connection type tension bars. The soft connection type tension bars do not need to be welded to the bottom steel plate 1, and the soft connection type tension bars are wound and connected and fixed to the upper main reinforcement bars 4. When the thickness of the single steel plate roof slab is relatively large, it solves the interference of the traditional welded tension bars standing vertically upward to the binding of the upper reinforcement bars, making the upper construction simple and efficient, meeting the requirements of modular construction and being convenient for construction. At the same time, in this embodiment, while ensuring the rationality of the structural design, the impact resistance of the components is improved. When the concrete layer of the roof slab is impacted by external flying objects, the force is transmitted to the internal components. Compared with the hard connection method of steel bar hooks, when the soft connection type tension bars transmit the force, the soft connection type tension bars in the impact area deform. This soft connection method of iron chain avoids the soft connection type tension bars in the impact area directly transmitting the impact load to the back bottom steel plate, avoiding the back bottom steel plate from being broken through, and effectively improving the impact resistance of the single steel plate concrete structure.

[0046] The soft connection type tension bar is a chain type tension bar. The chain type tension bar includes a number of chain links that are sequentially buckled. The chain type tension bar in this embodiment is an implementation form of the soft connection type tension bar, and it can also be set to other forms of soft connection type tension bars according to actual needs, and it is not limited here.

[0047] The material of the chain type tension bar is metal, and iron, steel, etc. can be used. The chain type tension bar in this embodiment is an iron chain type tension bar.

[0048] The hooking component is an inverted J-shaped stud 2 fixedly arranged at the top end of the bottom steel plate 1, and the link at the bottom of the chain-shaped tension bar is hooked and arranged at the hook of the inverted J-shaped stud 2. In this embodiment, the link of the chain-shaped tension bar can be hooked with the hook of the inverted J-shaped stud 2. During installation, just hook the two, and the installation is very fast and convenient.

[0049] The upper layer main reinforcement 4 includes transverse bars and longitudinal bars, and several transverse bars and longitudinal bars are respectively arranged. Several transverse bars are arranged in parallel at intervals respectively, and several longitudinal bars are arranged in parallel at intervals respectively and fixedly arranged on the transverse bars. A rectangular frame is formed between two adjacent transverse bars and two adjacent longitudinal bars, and the chain-shaped tension bar is wound around the corner of the rectangular frame. In this embodiment, due to the mutually fixed transverse bars and longitudinal bars, the chain-shaped tension bar can be wound from the outside of the longitudinal bar into the corner of the rectangular frame. After passing through the corner, it is wound outwards again and lapped to the outside of the longitudinal bar, which is more convenient for the chain-shaped tension bar to be wound, and the wound chain-shaped tension bar is firmly connected and not easy to fall off.

[0050] The construction method of the single steel plate concrete composite structure includes the following steps:

[0051] S1. Factory processing stage:

[0052] Prefabricate the upper layer main reinforcement 4, the bottom steel plate 1, the hooking component, and the soft connection type tension bar. Weld each hooking component to the bottom steel plate 1 at intervals, and arrange inverted J-shaped studs with a spacing of 200 mm on the steel plate.

[0053] S2. On-site construction stage:

[0054] Anchorage the upper layer main reinforcement 4 into the surrounding walls of the factory building or civil air defense structure. The bottom steel plate 1 is a stressed steel plate, and both ends are connected to the surrounding walls. During construction with a large span, a construction steel beam will be erected under the steel plate. And make the bottom steel plate 1 be directly below the upper layer main reinforcement 4. Among them, the factory building is a nuclear power plant building or an important industrial factory building.

[0055] Hook the bottom of each soft connection type tension bar to the inverted J-shaped stud, that is, the bottom link of the soft connection type tension bar is sleeved on the inverted J-shaped stud, and the top of each soft connection type tension bar is wound around the upper layer main reinforcement of the single steel plate concrete and connected and fixed. In this embodiment, just wind the soft connection type tension bar tightly to ensure that it does not loosen during concrete pouring, and it forms a firm whole in the floor slab after pouring. There is no welding point between the tension bar and the bottom steel plate, and the overall structure is complete and reliable, which is convenient for on-site construction.

[0056] Pour concrete into the assembled upper layer main reinforcement 4, the bottom steel plate 1, the hooking component, and the soft connection type tension bar.

[0057] In the traditional method, the tension bars are welded to the bottom steel plate. When resisting external impacts, the axial force is transmitted to the bottom steel plate through the tension bars, causing impact damage to the bottom steel plate. In the present invention, there is no rigid connection between the tension bars and the bottom steel plate, thus effectively improving the impact resistance of the structure.

[0058] Among them, the thickness of the bottom steel plate 1, the diameter of the upper main reinforcement 4, the reinforcement scheme, as well as the diameters, lengths, and layout spacings of the inverted J-shaped stud bolts and chain-type tension bars are determined by finite element analysis. A finite element model is established, and the stress analysis is carried out according to the specific engineering conditions, and the parameters and layout schemes of each component are adjusted to meet the actual use requirements.

[0059] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. The single steel plate concrete composite structure is characterized in that Including: The upper main reinforcement bars (4) are fixedly arranged on the peripheral walls of the factory building or civil air defense structure; The bottom steel plate (1) is located directly below the upper main reinforcement bars (4) and is fixedly arranged on the peripheral walls of the factory building or civil air defense structure; A number of hook connection components are respectively and fixedly arranged at intervals on the top end of the bottom steel plate (1); A number of soft connection type tension bars (3), each having deformation ability; the bottom end of each soft connection type tension bar is hooked to a hook connection component, and the top end of each soft connection type tension bar is wound and positioned on the upper main reinforcement bars (4); A concrete layer, the upper main reinforcement bars (4), the bottom steel plate (1), the hook connection components and the soft connection type tension bars are respectively poured inside the concrete layer; when the concrete layer is subjected to an external impact force, the soft connection type tension bars in the impact area are deformed to avoid the impact load being directly transmitted to the bottom steel plate (1).

2. The single steel plate concrete composite structure according to claim 1, characterized in that The soft connection type tension bar is a chain type tension bar; the chain type tension bar includes a number of chain links that are sequentially buckled.

3. The composite structure of single steel plate and concrete according to claim 2, wherein The material of the chain type tension bar is metal.

4. The composite structure of single steel plate and concrete according to claim 2 or 3, characterized in that The hook connection component is an inverted J-shaped stud (2) fixedly arranged on the top end of the bottom steel plate (1), and the chain link at the bottom of the chain type tension bar is hooked and arranged at the hook of the inverted J-shaped stud (2).

5. The single steel plate concrete composite structure according to claim 2 or 3, characterized in that, The upper main reinforcement bars (4) include: A number of transverse bars, which are respectively arranged in parallel at intervals; A number of longitudinal bars, which are respectively arranged in parallel at intervals and fixedly arranged on the transverse bars; a rectangular frame is formed between two adjacent transverse bars and two adjacent longitudinal bars, and the chain type tension bar is wound around the corner of the rectangular frame.

6. The construction method of the single steel plate concrete composite structure according to any one of claims 1 to 5, characterized in that, Including the following steps: S1. Factory processing stage: Precast the upper main reinforcement bars (4), the bottom steel plate (1), the hook connection components, and the soft connection type tension bars, and weld each hook connection component to the bottom steel plate (1) at intervals; S2. On-site construction stage: Fix the upper main reinforcement bars (4) and the bottom steel plate (1) to the peripheral walls of the factory building or civil air defense structure, and make the bottom steel plate (1) located directly below the upper main reinforcement bars (4); Hook the bottom of each soft connection type tension bar to the hook connection component, and wind and position the top to the upper main reinforcement bars (4); Pour concrete into the assembled upper main reinforcement bars (4), the bottom steel plate (I), the hook connection components, and the soft connection type tension bars.

7. The construction method of the single steel plate concrete composite structure according to claim 6, characterized in that, The thickness of the bottom steel plate (1), the diameter of the upper main reinforcement bars (4), and the diameters, lengths, and arrangement intervals of the hook connection components and the soft connection type tension bars are calculated and determined by the finite element analysis method.

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