Damping vibration and noise reduction type steel bar truss composite floor

Abstract

The damping vibration and noise reduction type steel bar truss composite floor comprises a prefabricated bottom plate, and a plurality of supporting units are arranged in the prefabricated bottom plate in an array mode; a damping vibration attenuation device is arranged in each supporting unit, so that the composite floor forms a periodic composite structure. Compared with other common floor slabs, the damping floor slab has better damping capacity, a damping device is installed on the middle layer, energy is dissipated through rolling of rolling mass balls and mutual friction between the rolling mass balls, meanwhile, the tuning purpose can be achieved by adjusting the sizes of the rolling mass balls, the size of a sliding face and materials, and the damping floor slab is suitable for large-scale popularization and application. The structure has good vibration and noise reduction capability; meanwhile, the top layer forms a periodic composite structure through the scattering units, the reinforcing mesh, the concrete layer and the like, the forbidden band frequency range of the structure is controlled by adjusting a structure array according to the Bragg scattering mechanism, transmission of vibration in the structure is controlled, and therefore the anti-vibration capacity of the structure is improved.

Description

Technical Field

[0001] The invention relates to the field of building vibration reduction and noise reduction, and in particular to a damping, vibration reduction and noise reduction type steel bar truss composite floor slab. Background Art

[0002] With the rise of the concept of green building, people are paying more and more attention to the comfort requirements of buildings. However, in our daily life, we suffer from many adverse effects caused by vibration and noise. For example, the environmental vibration and noise induced by rail transit affect our life, work and rest, and the vibration and noise caused by elevators and pedestrians in the building also affect our daily life. It can be seen that the requirements for vibration reduction and sound absorption and insulation performance of the floor in the building will become higher and higher. At present, the commonly used floor slabs in my country's residential buildings are cast-in-place reinforced concrete floor slabs, precast concrete hollow floor slabs, reinforced truss concrete composite floor slabs, etc. Cast-in-place reinforced concrete floor slabs refer to floor slabs made by supporting formwork, tying steel bars, pouring concrete, curing and removing formwork according to the design position on site. Precast concrete hollow floor slabs are floor slabs that form cavities in the floor slabs after placing embedded inner molds according to certain rules and pouring concrete. Reinforced truss composite floor slabs refer to a composite slab structure in which the upper and lower longitudinal force-bearing steel bars are welded with bent steel bars to form a steel truss, the external concrete is poured to form a precast layer, and the composite layer concrete is poured on the construction site. However, the several types of floor systems currently used in my country do not have good vibration and noise reduction performance, so noise nuisance incidents occur from time to time. There is an urgent need for a vibration and noise reduction floor to improve the quality of life of residents. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the prior art and provide a damping, vibration-reducing and noise-reducing steel bar truss composite floor.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: The present invention discloses a vibration-damping and noise-reducing steel bar truss composite floor, comprising a prefabricated bottom plate, wherein a plurality of supporting units are arranged in an array in the prefabricated bottom plate; A damping vibration reduction device is arranged in each supporting unit so that the composite floor slab forms a periodic composite structure.

[0005] As a preferred technical solution of the present invention, it also includes a steel mesh, the supporting unit is a steel truss, the steel mesh is horizontally arranged at the top of the steel truss, and it is welded to the top of each of the steel trusses.

[0006] As a preferred technical solution of the present invention, the precast base plate includes a second concrete layer, the top and bottom of the second concrete layer are cast with a first concrete layer, the steel mesh is buried in the first concrete layer at the top, and the upper and lower bars of the steel truss are buried in the first concrete layer at the top and the first concrete layer at the bottom respectively.

[0007] As a preferred technical solution of the present invention, a scattering unit is arranged in each mesh of the steel mesh.

[0008] As a preferred technical solution of the present invention, the scattering unit is a rubber damping ball, and is connected to the steel mesh through an adhesive liquid.

[0009] As a preferred technical solution of the present invention, the damping vibration reduction device includes a sliding surface and a blocking frame with an opening at the bottom end. The blocking frame is arranged in the steel truss, and its top end is connected to the upper chord of the steel truss. The sliding surface is arranged at the bottom opening of the blocking frame, and a closed chamber formed by the sliding surface and the blocking frame is filled with a plurality of rolling mass balls.

[0010] As a preferred technical solution of the present invention, the second concrete layer is foamed concrete.

[0011] As a preferred technical solution of the present invention, the steel mesh is a prismatic mesh structure formed by steel bars crossing at 45 degrees.

[0012] As a preferred technical solution of the present invention, the sliding surface is a curved surface, and its height is 10-20 mm, its width is 40-60 mm, and the height of the blocking frame is 40-60 mm.

[0013] As a preferred technical solution of the present invention, the rolling mass ball is made of rubber, and the diameter of the rolling mass ball is 4-8 mm.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The middle layer of the present invention is cast by lightweight concrete. Compared with cast-in-place reinforced concrete slabs and reinforced truss composite slabs, the slab structure is lighter and has better vibration reduction and noise reduction performance. In addition, the present invention utilizes the connection between the force-bearing bodies such as the reinforced trusses and the steel mesh to ensure the bearing capacity of the slab and the integrity of the structure. Compared with prefabricated hollow slabs, the present invention has better stability and earthquake resistance. The present invention has better vibration reduction capability than other commonly used floor slabs. The middle layer of the present invention is equipped with a damping vibration reduction device, which dissipates energy through the rolling of rolling mass balls and the mutual friction between the rolling mass balls. At the same time, the purpose of tuning can be achieved by adjusting the size of the rolling mass balls, the size of the sliding surface and the material, so that the structure has good vibration reduction and noise reduction capabilities. At the same time, the top layer forms a periodic composite structure through scattering units, steel mesh, concrete, etc. According to the Bragg scattering mechanism, the forbidden band frequency range of the structure is controlled by adjusting the structure array, and the propagation of vibration in the structure is controlled, thereby improving the vibration resistance of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic structural diagram of the damping vibration reduction device of the present invention; Figure 3 It is a schematic diagram of the structure of the steel mesh and the scattering unit of the present invention; Figure 4 This is one of the comparison diagrams of the vibration reduction and noise reduction effects of the present invention; Figure 5 This is the second comparison diagram of the vibration reduction and noise reduction effect of the present invention; In the figure: 1, first concrete layer; 2, steel truss; 3, second concrete layer; 4, damping vibration reduction device; 401, sliding surface; 402, rolling mass ball; 403, blocking frame; 5, steel mesh; 6, scattering unit. DETAILED DESCRIPTION

[0016] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0017] In the drawings, the same reference numerals all refer to the same components.

[0018] like Figure 1-3 As shown, the present invention provides a damping, vibration-reducing and noise-reducing steel bar truss composite floor, comprising a prefabricated bottom plate, in which a plurality of support units are arranged in an array; A damping device 4 is provided in each supporting unit so that the composite floor slab forms a periodic composite structure.

[0019] In this embodiment, the prefabricated base plate is the main body of the floor slab, and further supports it through the support units therein, and a damping vibration reduction device 4 in each support unit has the effect of reducing vibration and noise of the floor slab, and a floor slab with a periodic composite structure is formed through the above structure.

[0020] Furthermore, it also includes a steel mesh 5, the supporting unit is the steel truss 2, the steel mesh 5 is horizontally arranged at the top of the steel truss 2, and it is welded to the top of each steel truss 2.

[0021] In this embodiment, the steel trusses 2 serve as the main load-bearing members in the floor slab, and the steel mesh 5 is welded to the top of each steel truss 2 to enhance the integrity of the structure and improve the load-bearing capacity.

[0022] Furthermore, the precast base plate includes a second concrete layer 3, the top and bottom of the second concrete layer 3 are cast with a first concrete layer 1, the steel mesh 5 is buried in the first concrete layer 1 at the top, and the upper and lower bars of the steel truss 2 are buried in the first concrete layer 1 at the top and the first concrete layer 1 at the bottom, respectively.

[0023] In this embodiment, the mass of the second concrete layer 3 is lighter than the first concrete layer 1 of the upper and lower layers, so as to reduce the weight of the floor slab, reduce the deadweight of the structure and enhance the vibration reduction and noise reduction capabilities, and support the two first concrete layers 1 and the second concrete layer 3 by the steel truss 2.

[0024] Furthermore, a scattering unit 6 is provided in each mesh of the steel mesh 5 .

[0025] In this embodiment, a scattering unit 6 is provided in each mesh of the steel mesh 5 to enhance the vibration reduction capability of the floor.

[0026] Furthermore, the scattering unit 6 is a rubber damping ball, and is connected to the steel mesh 5 through an adhesive.

[0027] In this embodiment, the rubber damping balls are placed in the prismatic holes of the steel mesh, and the rubber damping balls are connected to the steel mesh by an adhesive, and form a periodic composite structure with the upper first concrete layer 1, which has a bandgap characteristic, that is, vibrations within the bandgap frequency range cannot propagate in the structure. And according to the Bragg scattering mechanism, by adjusting the array arrangement of the rubber damping balls, the bandgap frequency range of the structure can be controlled, thereby achieving the effect of controlling vibration and enhancing the vibration reduction capacity of the structure.

[0028] Furthermore, the damping vibration reduction device 4 includes a sliding surface 401 and a blocking frame 403 with an opening at the bottom end. The blocking frame 403 is arranged in the steel truss 2, and its top end is connected to the upper chord of the steel truss 2. The sliding surface 401 is arranged at the bottom opening of the blocking frame 403, and a closed chamber formed by the sliding surface 401 and the blocking frame 403 is filled with a plurality of rolling mass balls 402.

[0029] In this embodiment, the blocking frame 403 is welded under the upper reinforcement in the steel truss 2, and forms a structure with a closed chamber with the sliding surface 401, and a plurality of rolling mass balls 402 are installed in the closed chamber; When the floor slab remains stationary, the rolling mass ball 402 in the damping vibration reduction device 4 remains stationary; When the floor is subjected to external excitation, the floor vibrates first, and then drives the movement of the rolling mass balls 402 in the damping vibration reduction device 4. The rolling friction between the rolling mass balls 402 and the sliding surface 403 continuously dissipates the energy of the structure, thereby achieving the purpose of vibration reduction. At the same time, the rolling mass balls 402 will also rub against each other, making the vibration reduction effect better. Compared with the traditional external or suspended pendulum shock-absorbing devices that require the attachment of larger mass balls or mass blocks to the outside of the building, this device makes full use of the internal space of the floor, saves building space, and has excellent cost performance.

[0030] Furthermore, the second concrete layer 3 is foamed concrete.

[0031] In this embodiment, the second concrete layer 3 uses foam concrete to greatly improve the disadvantage of excessive self-weight of the floor slab. In addition, since this type of concrete has more pores, after the elastic wave propagates into the middle layer, due to the interconnected pores inside the material, the air molecules are subjected to friction and viscous resistance, causing the air to vibrate, thereby converting kinetic energy into mechanical energy, and finally converting it into heat energy due to friction and finally being absorbed. Therefore, the structure has a strong vibration reduction and noise reduction effect.

[0032] Furthermore, the steel mesh 5 is a prismatic mesh structure formed by steel bars crossing at 45 degrees.

[0033] In this embodiment, the steel mesh 5 is used to enhance the stability of the floor support.

[0034] Furthermore, the sliding surface 401 is a curved surface, and its height is 10-20 mm, its width is 40-60 mm, and the height of the blocking frame 403 is 40-60 mm.

[0035] In this embodiment, the sliding surface 401 is an arc surface to facilitate the movement of the rolling mass ball 402 thereon, and the sliding surface 401 is a damping material, wherein the damping material can be a rubber and plastic damping plate (such as butyl, acrylate, polysulfide, nitrile and silicone rubber, polyurethane, polyvinyl chloride and epoxy resin) or a high damping alloy (such as copper-zinc-aluminum, iron-chromium-molybdenum and manganese-copper alloys).

[0036] Furthermore, the rolling mass ball 402 is made of rubber, and the diameter of the rolling mass ball 402 is 4-8 mm.

[0037] In this embodiment, the rolling mass balls 402 will dissipate energy when rolling in the damping vibration reduction device 4, and the friction between the balls can also achieve the effect of vibration reduction and energy dissipation.

[0038] Specifically, the present invention proposes a damping vibration reduction and noise reduction type steel truss composite floor, which uses a damping vibration reduction device to reduce vibration and noise, and adopts a periodic composite structure composed of a steel mesh 5, a rubber damping ball and concrete to reduce vibration and noise, and through the construction of the steel truss 2, the damping vibration reduction device 4 and the concrete, it provides a certain vibration reduction and noise reduction capability while also ensuring the stress performance of the structure. The prefabricated bottom plate is formed by pouring concrete on the steel truss 2 tied in the factory, which serves as the main load-bearing and stress-bearing member; The damping vibration reduction device 4 is a rolling tuned mass damper, which achieves the effect of vibration reduction and energy consumption through the rolling of the rolling mass balls 402 in the damping vibration reduction device 4 and the mutual friction between the balls; the damping vibration reduction device 4 is installed on the upper steel bars in the steel truss 2, and then foam concrete is poured on the prefabricated bottom plate to form a second concrete layer 3, which plays a role in reducing the dead weight of the structure and enhancing the vibration reduction and noise reduction capabilities; the steel mesh 5 is connected to the steel truss 2 by welding to enhance the integrity of the structure and improve the stress performance of the structure; the scattering unit 6 is connected to the wire mesh 5 by an adhesive, and the first concrete layer 1 is poured to form the top layer of the structure, thereby forming a periodic composite structure with a bandgap characteristic to block the propagation of waves in the structure; at the same time, the rubber damping ball can also play a vibration reduction effect.

[0039] The steel truss 2 in the prefabricated base plate can be formed by welding in the factory. After the steel truss 2 is arranged, the second concrete layer 3 and the two first concrete layers 1 are poured. The strength of the first concrete layer 1 is higher than that of the second concrete layer 3 which is foam concrete. After the pouring is completed, the steel truss 2 and the two concrete layers serve as the main load-bearing components of the structure, which ensures the strength and bearing capacity of the floor slab and has the advantage of being easy and quick to construct.

[0040] The rolling mass ball 402 will dissipate energy when rolling in the damping vibration reduction device 4, and the friction between the balls can also achieve the effect of reducing vibration and consuming energy. The second concrete layer 3 is made of porous foam concrete, which can greatly improve the disadvantage of excessive self-weight of the floor slab. Moreover, since this type of concrete has many pores, after the elastic wave propagates into the middle layer, due to the interconnected pores inside the material, the air molecules are subjected to friction and viscous resistance, causing the air to vibrate, thereby converting kinetic energy into mechanical energy, which is finally converted into heat energy due to friction and is finally absorbed. Therefore, the structure has a strong vibration reduction and noise reduction effect.

[0041] The top of the composite floor in the present invention is composed of a steel mesh 5, a scattering unit 6, and a first concrete layer 1. First, the steel mesh 5 is welded to the top of the steel truss 2 by electric welding technology, and then the scattering unit 6 is placed in the prismatic cavity of the steel mesh 5. The scattering unit 6 is connected to the steel mesh 5 by an adhesive, and then the first concrete layer 1 is poured on the top to form a periodic composite structure. The structure has a bandgap characteristic, that is, vibrations within the bandgap frequency range cannot propagate in the structure. According to the Bragg scattering mechanism, the bandgap frequency range of the structure can be controlled by adjusting the array arrangement of the rubber damping balls, thereby achieving the effect of controlling vibration. At the same time, the existence of the damping balls also enhances the vibration reduction ability of the structure.

[0042] Generally, the steel truss 2 uses a triangular steel truss. When the structure is used for a two-way slab, the steel truss 2 uses a trapezoidal steel truss.

[0043] The production method of the floor slab in the present invention is as follows: the prefabricated bottom slab is prefabricated in a factory from a first concrete layer 1, a steel truss 2 and a second concrete layer 3; a damping vibration reduction device 4 is installed under the upper steel bars in the steel truss 2, the first concrete layer 1 is cast on the upper and lower ends of the steel truss 2, the lower bars of the steel truss 2 are located in the first concrete layer 1 of the lower layer, and the second concrete layer 3 is cast between the two first concrete layers 1 to form an intermediate layer, the web bars of the steel truss 2 are wrapped with concrete from bottom to top to form the first concrete layer 1, the second concrete layer 3, and the first concrete layer 1; the steel truss 2 is welded to the steel mesh 5 to form the entire steel skeleton of the floor slab, the rubber damping ball is connected to the steel mesh 5 by an adhesive, and the first concrete layer 1 is cast on the upper part to form a top layer.

[0044] In the above technical solution, the steel truss 2 is prefabricated and tied in the factory, and then ordinary concrete 1 is poured to form the structural form of the prefabricated bottom plate of the composite slab. During the pouring process, attention is paid to the vibration and compaction of the concrete, and whether the position of the steel truss 2 changes. The prefabricated bottom plate thus formed can not only meet the requirements of strength and bearing capacity, but also has the advantages of rapid construction and shortened construction period.

[0045] The damping vibration reduction device 4 is provided through a prefabricated blocking frame 403, in which a rolling mass ball 402 is loaded, and a sliding surface 401 is laid at the bottom opening of the blocking frame 403; the damping vibration reduction device 4 is then welded under the upper steel bar in the steel truss 2, and then the second concrete layer 3 is poured between the two first concrete layers 1 to form an intermediate layer, and then the steel mesh 5 is connected to the longitudinal steel bars of the steel truss 2 by welding to form a force-bearing skeleton of the floor structure, thereby ensuring the overall bearing capacity of the structure. The foam concrete in the intermediate layer has more pores and also has a strong vibration reduction and noise reduction effect. The top is composed of a periodic arrangement of steel meshes 5 and scattering units 6 in the steel meshes 5. According to the principle of local resonance, under the load excitation of a specific frequency, each single scattering unit 6 resonates and interacts with the incident wave, so that it cannot continue to propagate, thereby achieving the effect of vibration reduction and noise reduction.

[0046] like Figure 4-5 In order to verify the vibration reduction effect of the damping, vibration reduction and noise reduction steel truss composite floor proposed in the present invention, it is necessary to compare and analyze the ordinary steel truss floor and the composite floor in the present invention. Working condition 1 represents the working condition of the ordinary steel truss floor, and working condition 2 represents the working condition of the composite floor in the present invention; For the displacement response of different calculation points, the composite floor in the present invention has a smaller displacement response than that of the ordinary steel truss floor, and for the vertical vibration acceleration of the floor, the displacement response of the floor of the present invention is also smaller than that of the ordinary steel truss floor. It can be seen that the floor of the present invention has a role in reducing the vibration of different positions of the floor.

[0047] It can also be seen from the figure that at the moment of loading, the vertical vibration response in the mid-span of the floor slab is more intense, and with the passage of time, the vertical vibration acceleration gradually decays, and eventually tends to a steady-state change. The acceleration response of the composite floor slab in the present invention is smaller and decays faster than that of the ordinary floor slab. Finally, the acceleration curves of the two working conditions gradually overlap, which also reflects that the vibration of the floor slab under simple harmonic load is divided into a transient response that decays with damping and a steady-state resonant response that lasts infinitely.

[0048] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A damping, vibration reduction and noise reduction steel bar truss composite floor, characterized in that: It comprises a prefabricated bottom plate, in which a plurality of supporting units are arranged in an array; A damping vibration reduction device (4) is arranged in each supporting unit so that the composite floor slab forms a periodic composite structure.

2. The vibration-damping and noise-reducing steel bar truss composite floor slab according to claim 1 is characterized in that: It also comprises a steel mesh (5), the supporting unit is a steel truss (2), the steel mesh (5) is horizontally arranged at the top of the steel truss (2), and is welded to the top of each steel truss (2).

3. The vibration-damping and noise-reducing steel bar truss composite floor slab according to claim 2 is characterized in that: The prefabricated base plate comprises a second concrete layer (3), the first concrete layer (1) is cast on the top and bottom of the second concrete layer (3), the steel mesh (5) is buried in the first concrete layer (1) at the top, and the upper and lower bars of the steel truss (2) are buried in the first concrete layer (1) at the top and the first concrete layer (1) at the bottom, respectively.

4. A vibration-damping and noise-reducing steel bar truss composite floor according to claim 2 or 3, characterized in that: A scattering unit (6) is arranged in each mesh of the steel mesh (5).

5. The vibration-damping and noise-reducing steel bar truss composite floor slab according to claim 4 is characterized in that: The scattering unit (6) is a rubber damping ball and is connected to the steel mesh (5) via an adhesive liquid.

6. The damping, vibration reduction and noise reduction steel bar truss composite floor according to claim 3, characterized in that: The damping vibration reduction device (4) comprises a sliding surface (401) and a blocking frame (403) with an opening at the bottom end; the blocking frame (403) is arranged in the steel truss (2), and the top end thereof is connected to the upper chord of the steel truss (2); the sliding surface (401) is arranged at the bottom opening of the blocking frame (403); and a plurality of rolling mass balls (402) are filled in a closed chamber formed by the sliding surface (401) and the blocking frame (403).

7. The damping, vibration reduction and noise reduction steel bar truss composite floor according to claim 4, characterized in that: The second concrete layer (3) is foamed concrete.

8. The vibration-damping and noise-reducing steel bar truss composite floor slab according to claim 4, characterized in that: The steel mesh (5) is a prismatic mesh structure formed by steel bars crossing at 45 degrees.

9. The damping, vibration reduction and noise reduction steel bar truss composite floor according to claim 6, characterized in that: The sliding surface (401) is a curved surface, and its height is 10-20 mm, its width is 40-60 mm, and the height of the blocking frame (403) is 40-60 mm.

10. The vibration-damping and noise-reducing steel bar truss composite floor slab according to claim 6, characterized in that: The rolling mass ball (402) is made of rubber, and the diameter of the rolling mass ball (402) is 4-8 mm.

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