阅读说明：本技术 一种一体成型的低频隔振降噪复合板 (Integrated into one piece's low frequency vibration isolation composite sheet of making an uproar that falls ) 是由 马钢 高松涛 李国强 李磊 都思哲 王志勇 于 2021-11-15 设计创作，主要内容包括：本发明公开了一种一体成型的低频隔振降噪复合板,属于建筑材料技术领域；包括上层与下层的增强层,以及设置在上下增强层之间的隔振降噪复合结构层；隔振降噪复合结构层包括点阵栅格框架和均匀镶嵌于点阵栅格框架内的若干声子晶体散射体单元；声子晶体散射体单元由内部柱状核心体及包覆于核心体外层的粘弹性材料组成；本发明解决建筑楼板体系在使用过程中发生振动,以及伴随产生定频噪音的工程问题；该结构对沿板任意方向入射的特定频率范围的振动和声音均有良好的阻隔效应。(The invention discloses an integrally formed low-frequency vibration-isolation noise-reduction composite board, belonging to the technical field of building materials; the vibration isolation and noise reduction composite structure layer comprises an upper layer, a lower layer, an isolation layer and a noise reduction layer; the vibration isolation and noise reduction composite structure layer comprises a lattice grid frame and a plurality of phononic crystal scatterer units uniformly embedded in the lattice grid frame; the phonon crystal scatterer unit consists of an internal columnar core body and a viscoelastic material coated on the outer layer of the core body; the invention solves the engineering problems that the building floor system vibrates in the using process and fixed frequency noise is generated along with the vibration; the structure has good blocking effect on vibration and sound in a specific frequency range incident along any direction of the plate.)

1. An integrally formed low-frequency vibration-isolating noise-reducing composite plate is characterized by comprising an upper layer, a lower layer, an enhancement layer and a vibration-isolating noise-reducing composite structure layer, wherein the vibration-isolating noise-reducing composite structure layer is arranged between the upper layer and the lower layer; the vibration isolation and noise reduction composite structure layer comprises a lattice grid frame and a plurality of phononic crystal scatterer units uniformly embedded in the lattice grid frame; the phononic crystal scatterer unit consists of an internal columnar core body and a viscoelastic material coated on the outer layer of the core body.

2. The integrated low-frequency vibration and noise isolating composite plate according to claim 1, wherein the shape of the phononic crystal scatterer unit is a cylinder or a regular hexahedron.

3. The integrated low-frequency vibration and noise isolating composite plate according to claim 1, wherein the filling rate of the phononic crystal scatterer units in the lattice frame is 10% -78%.

4. The composite plate of any one of claims 1 to 3, wherein the lattice constant of the phononic crystal scatterer unit is 0.5 to 24 cm.

5. The composite vibration and noise reducing and vibration isolating plate as claimed in any one of claims 1 to 3, wherein the core is made of metal or nonmetal or polymer material, and the Young's modulus of the core material is 3 x 10⁸-1×10¹²Pa, density of 5000-³。

6. The composite vibration and noise reducing and low frequency composite board as claimed in any one of claims 1 to 3, wherein the viscoelastic material is rubber or resin material, and the Young's modulus of the viscoelastic material is 8 x 10³-2×10⁶Pa, density of 800-1800kg/m³。

7. The composite board of any one of claims 1 to 3, wherein the core body is formed by machining or molding, and the viscoelastic material coating layer is formed by molding through a high-temperature hot-pressing process.

8. The composite vibration and noise reducing composite board according to claim 1, wherein the lattice grid frame is made of concrete.

9. The composite plate of claim 1, wherein the reinforcement layers of the upper and lower layers are made of steel bars.

10. The integrated low-frequency vibration-isolating and noise-reducing composite board as claimed in claim 1, wherein the preparation method of the vibration-isolating and noise-reducing composite structure layer comprises: manufacturing a lattice grid frame component by adopting a steel mould with a corresponding size; arranging a corresponding number of steel lugs in a steel mould corresponding to the position of the phononic crystal scatterer unit, and fastening the steel lugs with the mould by using bolts; pouring a concrete material in the mould, curing and demoulding to prepare a lattice grid frame; and respectively embedding the phononic crystal scatterer units into reserved positions of the lattice grid framework.

Technical Field

The invention belongs to the technical field of building materials, and relates to a concrete slab, in particular to a reinforced concrete composite slab with low-frequency vibration isolation and noise reduction functions.

Background

In recent years, with the continuous development of building technology, large-span concrete floor structures are widely applied to public buildings such as industrial equipment plants, markets, large-scale venues, hospitals, subway stations, railway stations and the like, and because the quality and the damping of a floor system are smaller and smaller, the natural vibration frequency is lower and lower, and the like, in the normal use process, the building floor system is easy to vibrate, the vibration frequency is usually limited in a certain specific narrow-band range, and the comfort level of the building can be seriously influenced when the vibration reaches a certain degree. The vibration is often accompanied by constant frequency noise generated by the equipment or the vibration. Particularly, with the rapid development of the industrial transportation industry, the urbanization process is accelerated, urban expressways, rail transit and the like are generated successively, and the low-frequency noise pollution generated by vibration is increasingly serious. Due to the variety of noise sources, it is very difficult to control the generation of noise, which puts demands on the vibration damping, noise insulation and noise reduction performance of the building structure itself.

The suppression of harmful noise and vibration is a problem that needs to be solved urgently in engineering technology. The solid structure is used as a main medium for transmitting vibration and noise, and has the characteristics of capability of transmitting various waveforms, long propagation distance, small attenuation and the like, so that the isolation and control problem of elastic waves in the solid structure becomes the difficulty of vibration isolation and noise reduction in engineering, and is also a hot research subject in the field at present. As a long-span foundation member in a building structure, a reinforced concrete slab is an important subject of attention in subject fields such as architecture and mechanics, and is one of main research objects in the fields of vibration and noise. By introducing the periodic idea into the design of the plate-like structure, a plate-like structure with a vibrating band gap can be obtained, which suppresses the propagation of vibrations and noise in the band gap frequency range. Therefore, the periodic structure has potential application prospects in the aspects of sound insulation and vibration isolation, and a new idea can be provided for the existing sound insulation and noise reduction technology of buildings.

Disclosure of Invention

The invention overcomes the defects of the prior art, provides a reinforced concrete composite board with low frequency vibration isolation and noise reduction, and solves the engineering problems that the existing building floor system is easy to vibrate in the normal use process, the building comfort is seriously influenced, and the fixed frequency noise is often generated along with equipment or vibration in the vibration occasions.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an integrally formed low-frequency vibration-isolating noise-reducing composite plate comprises an upper layer, a lower layer, an enhancement layer and a vibration-isolating noise-reducing composite structure layer, wherein the vibration-isolating noise-reducing composite structure layer is arranged between the upper enhancement layer and the lower enhancement layer; the vibration isolation and noise reduction composite structure layer comprises a lattice grid frame and a plurality of phononic crystal scatterer units uniformly embedded in the lattice grid frame; the phononic crystal scatterer unit consists of an internal columnar core body and a viscoelastic material coated on the outer layer of the core body.

Preferably, the shape of the phononic crystal scatterer unit is any one of a cylinder, a cube, and a regular hexahedron.

Preferably, the filling rate of the phononic crystal scatterer units in the lattice frame is 10% -78%.

Preferably, the lattice constant of the phononic crystal scatterer unit is 0.5-24 cm.

Preferably, the core body is made of metal or nonmetal or polymer material, and the Young's modulus of the material is 3 × 10⁸-1×10¹²Pa, density of 5000-³。

Preferably, the viscoelastic material is a rubber or resin material, and the young's modulus of the viscoelastic material is 8 × 10³-2×10⁶Pa, density of 800-1800kg/m³。

Preferably, the core body is formed by machining or die forming, and the viscoelastic material coating is formed by die forming through a high-temperature hot pressing process.

Preferably, the lattice grid frame is made of concrete.

Preferably, the material of the reinforcement layer of the upper layer and the reinforcement layer of the lower layer is steel bars.

Preferably, the preparation method of the vibration isolation and noise reduction composite structure layer comprises the following steps: manufacturing a lattice grid frame component by adopting a steel mould with a corresponding size; arranging a corresponding number of steel lugs in a steel mould corresponding to the position of the phononic crystal scatterer unit, and fastening the steel lugs with the mould by using bolts; pouring a concrete material in the mould, curing and demoulding to prepare a lattice grid frame; and respectively embedding the phononic crystal scatterer units into reserved positions of the lattice grid framework.

Compared with the prior art, the invention has the following beneficial effects:

the invention is sequentially provided with three structural layers of a reinforcing steel bar enhancement layer, a periodic phonon crystal lattice layer and a reinforcing steel bar enhancement layer from top to bottom; the lattice layer is periodically embedded in a precast concrete lattice grid by phononic crystals, and an integral concrete slab is poured after upper and lower reinforcing bars are arranged. The structure has good blocking effect on vibration and sound in a specific frequency range incident along any direction of the plate.

The invention can obtain the plate structure with the vibrating band gap by introducing the periodic thought into the design of the plate structure, and the plate structure can inhibit the vibration and the noise transmission in the band gap frequency range.

Drawings

Fig. 1 is a perspective view of a reinforced concrete panel composite structure according to the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a longitudinal sectional view of fig. 1.

Fig. 4 is a structural diagram of a phononic crystal scatterer unit.

Fig. 5 is a block diagram of a concrete lattice grid frame assembly.

FIG. 6 is a schematic view of the assembly of the phononic crystal scatterer unit and the concrete lattice grid frame assembly.

FIG. 7 is a schematic view of a periodic lattice bump mold.

In the figure, 1 is an upper reinforcing steel bar layer, 2 is a lower reinforcing steel bar layer, 3 is a vibration isolation and noise reduction composite structure layer, 30 is a phonon crystal scatterer unit, 31 is a concrete lattice grid frame, 301 is a core body, 302 is a viscoelastic material, 4 is a steel mold, and 5 is a steel bump.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.

Example 1

With reference to fig. 1-3, an integrated reinforced concrete composite board with low frequency vibration isolation and noise reduction functions according to the present embodiment is described, wherein the concrete composite board is rectangular in appearance, and is molded by using a floor slab mold, and the length, width and height of the interior of the floor slab mold are greater than the length, width and height of the lattice grid frame by more than 35 mm.

The concrete composite board comprises an upper reinforcing steel bar layer 1, a lower reinforcing steel bar layer 2 and a vibration isolation and noise reduction composite structure layer 3 arranged between the upper reinforcing steel bar layer and the lower reinforcing steel bar layer; the vibration isolation and noise reduction composite structure layer 3 comprises a concrete lattice grid frame 31 and a plurality of phononic crystal scatterer units 30; a plurality of phononic crystal scatterer units 30 are transversely and longitudinally embedded on the concrete lattice grid frame 31 in a periodic manner; the phononic crystal scatterer unit 30 is composed of an inner columnar core 301 and a viscoelastic material 302 wrapping an outer layer of the core 301. The shape of the phononic crystal scatterer unit 30 may be any one of a cylinder, a cube, and a regular hexahedron, and in this embodiment, is a cylinder. The filling rate of the phononic crystal scatterer unit 30 in the concrete lattice grid frame 31 is 10% -78%, in this embodiment 78%. The phononic crystal scatterer unit 30 has a primitive cell lattice constant of 20 cm.

The concrete lattice grid frame 31 is rectangular in appearance with lattice holes, and the circular holes on the frame assembly are the same size as the phonon crystal diffuser units 30, see fig. 5. And forming the die by adopting a special steel die and a steel bump.

The core body 301 is made of metal, nonmetal or polymer material such as steel, lead or concrete, and has Young's modulus of 3 × 10⁸To 1X 10¹²Pa, density of 5000-20000kg/m³. The viscoelastic material 302 is a rubber or resin material, and a rubber material is used in this embodiment. The Young's modulus of the viscoelastic material 302 is 8 × 10³-2×10⁶Pa, density of 800-1800kg/m³. The core body 301 is formed by machining or molding, and the rubber coating layer is formed by a high-temperature hot-pressing process by using a special mold, as shown in fig. 4.

In this embodiment, the core material is low-carbon steel, the coating material is silicon rubber, and the matrix material is fiber concrete.

The specific preparation process comprises the following steps: and (3) manufacturing the fiber concrete lattice grid frame component by adopting a special steel mould 4 with a corresponding size. Corresponding to the position of the lattice grid local resonance scatterer, a corresponding number of steel lugs 5 are arranged in the special steel mould, and the steel lugs 5 and the steel mould 4 are fastened by bolts. And (3) pouring a fiber concrete material in the steel mould 4, curing for at least 7 days, and then demoulding to finish the forming of the fiber concrete lattice grid framework. And embedding the phononic crystal scatterer units into the reserved positions of the fiber concrete lattice grid framework respectively to form the vibration isolation and noise reduction composite structure layer assembly. And laying lower-layer steel bars in the floor slab die through the cushion blocks, pouring lower-layer fiber concrete, and maintaining for more than 1 day. High-strength cement mortar with the thickness of 5mm is coated on the upper surface of the hardened lower fiber concrete layer, and the positioning vibration-isolating noise-reducing composite structure layer is positioned on the upper surface of the high-strength cement mortar by adopting the cushion block. Laying upper-layer steel bars, pouring and forming the floor slab by using the same-strength fiber concrete, and curing for 28 days, see fig. 6 and 7.

Example 2

The phononic crystal scatterer unit of the present embodiment has a hexagonal columnar structure in its outer shape. The core body material adopts lead, the coating layer material adopts artificial resin, and the base material adopts high-toughness concrete.

The specific preparation process comprises the following steps: and (3) manufacturing the high-toughness concrete lattice grid frame component by adopting a special steel mould with a corresponding size. Corresponding to the position of the lattice grid local resonance scatterer, arranging a corresponding number of steel lugs in a special steel mould, and fastening the steel lugs and the special mould by using bolts. And pouring a high-toughness concrete material in the special mould, curing for at least 7 days, and then demoulding to complete the forming of the high-toughness concrete lattice grid framework. And respectively embedding the phononic crystal scatterer units into reserved positions of a high-toughness concrete lattice grid frame to form a vibration isolation and noise reduction composite structure layer assembly. And laying lower-layer steel bars in the floor slab die through the cushion blocks, pouring lower-layer high-toughness concrete, and maintaining for more than 1 day. High-strength cement mortar with the thickness of 5mm is coated on the upper surface of the hardened lower-layer high-toughness concrete, and the positioning vibration-isolating noise-reducing composite structure layer is positioned on the upper surface of the high-strength cement mortar by adopting the cushion block. Laying upper-layer reinforcing steel bars, pouring and forming the floor slab by using the same-strength high-toughness concrete, and curing for 28 days, see fig. 6 and 7.

The working process is as follows: the vibration isolation and noise reduction structure performs vibration absorption and sound absorption through the phononic crystal scatterer unit, wherein the core body and the coating layer form the multi-degree-of-freedom vibrator unit, so that the core body generates multi-degree-of-freedom vibration in the coating layer under the action of elastic waves, frequency band gaps are generated in the elastic waves in the transmission process, and the vibration excitation is attenuated in a certain frequency range, so that the vibration isolation and noise reduction function of the structure is realized.

While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.