Double-layer sound insulation composite floor slab based on tension and compression partition design

Abstract

The invention discloses a double-layer sound insulation composite floor slab based on tension and compression partition design, which relates to the technical field of building structure sound insulation integration and comprises a nanofiber foam concrete sound insulation bottom plate, a rubber particle concrete noise reduction layer, a steel bar net rack and a cast-in-place layer. High-frequency air sound is isolated through a foam cavity of the nanofiber foam concrete sound insulation bottom plate, low-and-medium-frequency impact sound is dissipated through vibration of rubber particles of the rubber particle concrete noise reduction layer, vibration energy is further absorbed through a suspension mass damping spring system formed by all the layers and truss steel bars, and multi-cooperative noise reduction is achieved. Based on the tension and compression partition design, a bearing structure and a sound insulation system are integrated, secondary sound insulation treatment is avoided, the construction efficiency is improved, meanwhile, a fiber reinforcement mode is adopted, the sound insulation performance is improved, and meanwhile the crack resistance and durability of the bottom of the floor slab are guaranteed. According to the invention, the integrated design of acoustics, structure and durability is realized, and excellent sound insulation effect, reliable structure performance and construction convenience are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building structure sound insulation integration, and particularly relates to a double-layer sound insulation composite floor based on tensile and compressive zoning design. BACKGROUND

[0002] The concrete composite floor composed of a prefabricated bottom plate and a cast-in-place layer greatly reduces the use of on-site operations and labor as an important component in the assembly type concrete structure. The building floor, as an important load-bearing component in the building, is extremely prone to significant structural sound transmission effects under the action of random excitations such as mechanical impact, foot vibration and equipment noise.

[0003] At present, the traditional composite board mainly depends on increasing the thickness of the board and adding a sound insulation cushion layer to achieve sound insulation, which has achieved certain results, but has problems such as increased self-weight and complicated construction process, and has not achieved overall improvement of structural safety and comfort through structural function integration design. Secondly, although the existing sound insulation board can effectively block air-borne noise, the inhibitory effect on solid-borne noise caused by structural vibration is still obviously insufficient. Thirdly, the design idea of the existing composite board is mostly limited to single structural function, and cannot fully play the material characteristics by deeply integrating the concept of "tensile and compressive zoning", so as to realize the structural function integration design. SUMMARY

[0004] In order to overcome the above problems in the prior art, the present application provides a double-layer sound insulation composite floor based on tensile and compressive zoning design. The sound insulation and noise reduction bottleneck mentioned in the background technology is effectively overcome, and the design concept of "tensile and compressive zoning" is further applied to realize the key technology of the assembly type concrete sound insulation structure system based on tensile and compressive zoning design, achieve the integrated design of component load bearing and sound insulation, avoid the problem that the traditional composite floor needs to be treated twice for sound insulation, and reduce the on-site operation. In addition, the fiber reinforcement technology is adopted to improve the sound insulation performance of the composite floor and ensure the structural crack resistance and durability.

[0005] The technical scheme adopted by the present application to solve the technical problems is as follows: a double-layer sound insulation composite floor based on tensile and compressive zoning design, comprising a steel mesh frame, a combined sound insulation layer and a cast-in-place layer, the combined sound insulation layer is prefabricated as an integral structure with the steel mesh frame, the combined sound insulation layer comprises a nano-fiber foam concrete sound insulation bottom plate and a rubber particle concrete noise reduction layer, the nano-fiber foam concrete sound insulation bottom plate is integrally poured with the steel mesh frame, the rubber particle concrete noise reduction layer is poured after the nano-fiber foam concrete sound insulation bottom plate is hardened and forms an integral whole with the nano-fiber foam concrete sound insulation bottom plate and the steel mesh frame, and the cast-in-place layer is poured on the upper side of the rubber particle concrete noise reduction layer at the construction site. The steel bar frame is composed of longitudinal steel bars, transverse steel bars, truss steel bars and construction steel bars, the longitudinal steel bars are connected by binding with the transverse steel bars, the truss steel bars are fixedly connected with the longitudinal steel bars or the transverse steel bars, and the construction steel bars are fixedly connected to the upper side of the truss steel bars by binding; The nanofiber foam concrete sound insulation bottom plate is provided with foam gaps for isolating high-frequency noise and high-strength fibers for improving the bottom anti-cracking capacity. The rubber particle concrete noise reduction layer is provided with rubber particles, and based on the thermal expansion and cold shrinkage effect, a micro cavity wrapping the rubber particles is formed on the periphery of the rubber particles to dissipate low-frequency noise generated by knocking through the collision of the particles and the cavity wall.

[0006] The truss steel bars, the nanofiber foam concrete sound insulation bottom plate, the rubber particle concrete noise reduction layer and the cast-in-place layer form a suspended mass damping spring system to absorb the vibration energy of the floor caused by impact.

[0007] The nanofiber foam concrete sound insulation bottom plate specifically includes cement, water, fly ash, prefabricated foam, ultrahigh molecular weight polyethylene fiber and sand and gravel, the foam porosity is 55% to 75%, and the effective dosage of the ultrahigh molecular weight polyethylene fiber is 1% to 4%.

[0008] The rubber particle concrete noise reduction layer specifically includes cement, water, fly ash, rubber particles and sand and gravel, the diameter of the rubber particles is 3mm to 6mm, and the volume ratio is 3% to 4%.

[0009] The rubber particle concrete noise reduction layer is formed by a thermal expansion pore-forming process. The thermal expansion pore-forming process is that the noise reduction layer is heated and maintained at 45±5℃, the rubber particles in the noise reduction layer are expanded by heat, and the micro cavity wrapping the rubber particles is formed on the periphery of the rubber particles after subsequent cooling, so as to dissipate low-frequency noise transmitted by impact through the collision of the rubber particles and the cavity wall.

[0010] The thickness of the nanofiber foam concrete sound insulation bottom plate and the rubber particle concrete noise reduction layer is 0.5 (1- ξ b ) h 0, wherein ξ b is the relative limit compression zone height, h 0 is the effective cross-section height.

[0011] The beneficial effects of the present application are: 1. The present application combines rubber particle concrete and nanofiber foam concrete to construct a double-layer composite sound insulation structure. The design makes full use of the acoustic characteristics of the two materials, with rubber particle concrete focusing on impact buffering and low-frequency absorption, and nanofiber foam concrete strengthening high-frequency damping and overall sound insulation. The two work together to achieve efficient suppression of floor noise in all frequency bands, significantly widening the effective sound insulation frequency band, thereby significantly improving the overall sound insulation performance of the composite floor while ensuring lightweight structure.

[0012] 2. The present application is based on the design concept of tension and compression zoning: the tensile zone uses nanofiber foam concrete and rubber particle concrete with excellent sound insulation and tensile properties, and the compression zone uses ordinary concrete to ensure compression resistance. The design precisely matches the material properties, achieving structural efficiency while responding to green and sustainable requirements through the use of composite functional materials.

[0013] 3. The present application uses fiber reinforcement to compensate for the poor crack resistance of nanofiber foam concrete due to its porous structure, improving the overall sound insulation effect of the floor while ensuring structural crack resistance and durability, thereby achieving a deep integration of load-bearing and sound insulation functions. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the present application; Figure 2 is a schematic diagram of the present application Figure 1 A portion of the enlarged view; Figure 3 is a cross-sectional schematic diagram of the present application; Figure 4 is a schematic diagram of the present application Figure 3 B portion of the enlarged view; Figure 5 is a top view of the present application; Figure 6 is a schematic diagram of the present application suspension mass damping spring system; Figure 7 is a schematic diagram of the present application suspension mass damping spring system; 1, steel mesh frame; 1a, longitudinal reinforcement; 1b, transverse reinforcement; 1c, truss reinforcement; 1d, structural reinforcement; 2, nanofiber foam concrete sound insulation bottom plate; 3, rubber particle concrete noise reduction layer; 4, cast-in-place layer. DETAILED DESCRIPTION

[0015] To better understand the technical solutions of the present application, the present application will be described in detail below in conjunction with the drawings and specific embodiments.

[0016] As Figures 1-5As shown, the embodiment discloses a double-layer sound insulation composite floor based on tension and compression partition design, which comprises a steel mesh frame 1, a nano-fiber foam concrete sound insulation bottom plate 2, a rubber particle concrete noise reduction layer 3 and a cast-in-place layer 4.

[0017] The double-layer sound insulation composite floor based on tension and compression partition design, the longitudinal reinforcement 1a and the transverse reinforcement 1b are connected by binding, the truss reinforcement 1c is connected with the longitudinal reinforcement 1a or the transverse reinforcement 2b by welding, and the construction reinforcement 1d is fixed on the upper side of the truss reinforcement 1c by binding connection; the nano-fiber foam concrete sound insulation bottom plate 2 is prefabricated in a prefabrication factory and integrally poured with the steel mesh frame 1; the rubber particle concrete noise reduction layer 3 is poured after the nano-fiber foam concrete sound insulation bottom plate 2 is hardened and forms an integral whole with the nano-fiber foam concrete sound insulation bottom plate 2 and the steel mesh frame 1, constituting a core sound insulation system; the cast-in-place layer 4 is poured on the upper side of the rubber particle concrete noise reduction layer 3 at the construction site and forms an integral whole with the steel mesh frame 1, the nano-fiber foam concrete sound insulation bottom plate 2 and the rubber particle concrete noise reduction layer 3.

[0018] In the embodiment, the connection mode of the steel truss 1c penetrating through the nano-fiber foam concrete sound insulation bottom plate 2, the rubber particle concrete noise reduction layer 3 and the cast-in-place layer 4 greatly strengthens the shear capacity of the composite surface and ensures the collaborative working performance of the composite floor.

[0019] The double-layer sound insulation composite floor based on tension and compression partition design, the nano-fiber foam concrete sound insulation bottom plate 2 uses nano-fiber foam concrete as the main raw material, and the specific materials include cement, water, fly ash, prefabricated foam, ultrahigh molecular weight polyethylene fiber and sandstone, wherein the foam porosity is 55%~75% and the effective dosage of ultrahigh molecular weight polyethylene fiber is 1%~4%.

[0020] In the embodiment, the nano-fiber foam concrete sound insulation bottom plate 3 uses nano-fiber foam concrete, and taking a cubic test block with a side length of 40mm as an example, the soil mix ratio is cement 28g, ultrahigh molecular weight polyethylene fiber 6.55g, prefabricated foam 980ml, and the water-cement ratio is 0.35. The manufacturing process is as follows: firstly, white cement and water are added to a mortar mixer and mixed and stirred at low speed for 2min to form cement neat paste. Then, a sodium stearate nano-fiber foaming liquid is prepared into prefabricated foam by using a high-speed stirring method with a beater. Then, the prefabricated foam and the ultrahigh molecular weight polyethylene fiber are measured and added to the cement neat paste, and high-speed stirring is performed for 1min to obtain a foam concrete slurry. The nano-fiber foam concrete has the characteristics of low density, which reduces the difficulty in transportation and hoisting process of the composite floor. At the same time, the nano-fiber network optimizes the mechanical response by inhibiting crack propagation, ensuring its load-bearing function.

[0021] The double-layer sound insulation composite floor based on tension-compression zoning design, the specific materials of the rubber particle concrete noise reduction layer 3 include cement, water, fly ash, rubber particles and sandstone, wherein the diameter of the rubber particles is 3mm-6mm, and the volume ratio of the rubber particles is 3%-3.2%.

[0022] In the embodiment, the rubber particle concrete noise reduction layer 3 adopts rubber particle concrete, and the specific materials include cement, water, fly ash, rubber particles and sandstone, wherein m(cement) : m(fly ash) : m(water) : m(sand) : m(aggregate) = 1 : 0.25 : 0.50 : 1.65 : 2.475, the rubber particle content is 5%, the rubber particle size is 3mm-6mm, the polypropylene fiber content is 0.1%, and an appropriate amount of polycarboxylic acid water reducing agent is added at the same time to avoid the adverse effect of rubber particles on workability. The rubber particle concrete can significantly improve the ability of the floor to insulate impact sound and effectively compensate for the short board of the lower layer of nano-fiber foam concrete in the frequency spectrum range. The double-layer composite sound insulation system formed by the two can efficiently block and dissipate noise energy, thereby achieving more comprehensive and excellent overall sound insulation effect in a wide frequency range.

[0023] The double-layer sound insulation composite floor based on tension-compression zoning design, the rubber particle concrete noise reduction layer 3 is prepared by a thermal expansion pore-forming process. Under the condition of heating and curing (45±5℃), the rubber particles in the mixture are heated to produce volume expansion, which forms a pre-compressive stress on the surrounding concrete. After cooling, the particles shrink and form microcavities in the interface area.

[0024] The double-layer sound insulation composite floor based on tension-compression zoning design, after the noise is generated, the sound waves are scattered by the foam voids in the nano-fiber foam concrete sound insulation bottom plate 2, thereby insulating the noise; the low-frequency noise transmitted by knocking and the like is dissipated by the sliding friction between the fibers and the concrete in the nano-fiber foam concrete sound insulation bottom plate 2; the low-frequency noise transmitted by knocking and the like is dissipated by the collision between the rubber particles and the cavity wall in the rubber particle concrete noise reduction layer 3; and the floor vibration energy caused by knocking is further absorbed by the suspended mass damping spring system (as shown in Figures 6-7 In the system, the truss steel bars 1c provide springs, the nano-fiber foam concrete sound insulation bottom plate 2 provides mass, and the rubber particle concrete noise reduction layer 3 provides springs and damping as a composite structure.

[0025] The double-layer sound insulation composite floor based on tension-compression zoning design, the defect of poor crack resistance of the concrete caused by the foam porous structure of the nano-fiber foam concrete sound insulation bottom plate 3 is compensated by adding fibers in the nano-fiber foam concrete sound insulation bottom plate 3.

[0026] The double-layer sound insulation composite floor based on tension-compression zoning design, the thickness of the nano-fiber foam concrete sound insulation bottom plate 2 and the rubber particle concrete noise reduction layer 3 is 0.5 (1-ξ b )h0, wherein ξ b is the relative limit compression zone height, and h0 is the effective section height.

[0027] In the embodiment, the nano-fiber foam concrete sound insulation bottom plate 2 is 30 mm thick, and the rubber particle concrete noise reduction layer 3 is 30 mm thick, so as to play the advantages of the composite material in tension and sound insulation; the cast-in-place layer 4 is 70 mm thick, and the compressive performance is fully utilized. The thickness is determined based on the relative limit compression zone height for structural optimization, so as to realize the tension-compression zoning design of the composite floor, improve the sound insulation performance of the composite floor on the basis of ensuring the structural crack resistance and durability.

[0028] The specific construction process of the embodiment is as follows: step one: in the prefabrication workshop, a formwork of the nano-fiber foam concrete sound insulation bottom plate is pre-prepared, and longitudinal and transverse steel bars are bound according to the design requirements; a truss steel bar is arranged on the bound steel mesh, and then the nano-fiber foam concrete is poured; after the upper layer of the concrete is smoothed, roughening treatment is performed to form a rough surface; after pouring is completed, standard curing is performed for 28 days, and after the curing period is over, the formwork is removed, and the nano-fiber foam concrete sound insulation bottom plate is obtained.

[0029] Step two: after the strength of the nano-fiber foam concrete sound insulation bottom plate reaches 75% of the design strength, a formwork is erected on the basis of the bottom plate, rubber particle concrete is prepared, and the rubber particle concrete is poured into the formwork while being vibrated and tapped to ensure compactness; after pouring is completed, standard curing is performed for 28 days, and after the curing period is over, the formwork is removed, and the rubber particle concrete noise reduction layer is formed.

[0030] Step three: when the strength of the rubber particle concrete noise reduction layer reaches more than 75% of the design value, the surface of the noise reduction layer is moistened at the construction site, and a formwork of the cast-in-place layer is erected; then a construction steel mesh is laid, an ordinary concrete surface layer is poured, and the surface is smoothed and the surrounding construction environment is cleaned; after pouring is completed, standard curing is performed for 28 days, and thus the final double-layer sound insulation composite floor based on tension-compression zoning design is obtained.

[0031] The above embodiment is only an exemplary embodiment of the present application and is not used to limit the present application. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and the modification or equivalent replacement is also regarded as falling within the protection scope of the present application.

Claims

1. A double-layer sound-insulating composite floor slab based on tension-compression partitioning design, characterized in that, The system includes a steel mesh frame, a combined sound insulation layer, and a cast-in-place layer. The combined sound insulation layer and the steel mesh frame are prefabricated as an integral structure. The combined sound insulation layer includes a nanofiber foam concrete sound insulation base plate and a rubber particle concrete noise reduction layer. The nanofiber foam concrete sound insulation base plate and the steel mesh frame are cast as a whole. The rubber particle concrete noise reduction layer is cast after the nanofiber foam concrete sound insulation base plate has hardened and forms an integral whole with the nanofiber foam concrete sound insulation base plate and the steel mesh frame. The cast-in-place layer is cast on the upper side of the rubber particle concrete noise reduction layer at the construction site. The steel mesh is composed of longitudinal steel bars, transverse steel bars, truss steel bars, and structural steel bars. The longitudinal steel bars are tied to the transverse steel bars, the truss steel bars are fixedly connected to the longitudinal steel bars or the transverse steel bars, and the structural steel bars are fixed to the upper side of the truss steel bars by tying. The nanofiber foam concrete sound insulation base plate is provided with foam voids for isolating high-frequency noise and high-strength fibers for improving the bottom's crack resistance. The rubber particle concrete noise reduction layer contains rubber particles, and based on the thermal expansion and contraction effect, microscopic cavities are formed around the rubber particles to dissipate low-frequency noise generated by impact through the collision between the particles and the cavity walls.

2. The truss reinforcement, nanofiber foam concrete sound insulation base plate, rubber particle concrete noise reduction layer, and cast-in-place layer form a suspended mass damping spring system to absorb the vibration energy of the floor slab caused by impact.

3. A double-layer sound-insulating composite floor slab based on tension-compression partitioning design according to claim 1, characterized in that, The specific materials of the nanofiber foam concrete sound insulation base plate include cement, water, fly ash, precast foam, ultra-high molecular weight polyethylene fiber, and sand and gravel. The foam porosity is 55%~75%, and the effective content of ultra-high molecular weight polyethylene fiber is 1%~4%.

4. A double-layer sound-insulating composite floor slab based on tension-compression partitioning design according to claim 1, characterized in that, The specific materials of the rubber particle concrete noise reduction layer include cement, water, fly ash, rubber particles, and sand and gravel. The diameter of the rubber particles is 3mm to 6mm, and the volume ratio is 3% to 4%.

5. A double-layer sound-insulating composite floor slab based on tension-compression partitioning design according to claim 3, characterized in that, The rubber particle concrete noise reduction layer is formed by thermal expansion pore formation process. The thermal expansion pore formation process is as follows: the noise reduction layer is heated and cured at 45±5℃, so that the rubber particles in it expand due to heat, and after subsequent cooling, the micro-cavities are formed on the periphery of the particles, so as to dissipate the low-frequency noise transmitted by impact through the collision between the rubber particles and the cavity wall.

6. A double-layer sound-insulating composite floor slab based on tension-compression partitioning design according to claim 1, characterized in that, The thickness of both the nanofiber foam concrete sound insulation base plate and the rubber particle concrete noise reduction layer is 0.5 (1- ξ b ) h 0, where ξ b This refers to the relative height of the boundary pressure zone. h 0 represents the effective height of the cross section.

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