A precast concrete locally resonant periodic vibration-damping road slab

Abstract

The application discloses a kind of precast concrete local resonance periodicity vibration reduction road plate, including base layer, panel layer and local resonance unit array layer, the local resonance unit array layer is set between base layer and panel layer and with base layer and panel layer integrally casted to form precast road plate.The precast road plate formed by the scheme can realize engineering vibration attenuation effect on the basis of meeting the strength requirement of road plate by the laminated design of rubber concrete base layer, local resonance unit array layer and rubber concrete panel layer.Secondly, by the synergistic effect of local resonance elastic wave band gap filtering and rubber concrete damping vibration reduction, the vibration reduction performance of road plate is further enhanced, and the negative impact of vibration on human health and working environment can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of construction engineering, and in particular to a precast concrete local resonance periodic vibration damping road slab. Background Art

[0002] During the project startup phase, in order to ensure the normal transportation of materials and the normal operation of large machinery, the traditional practice is usually to harden the site through cast-in-place concrete flooring to meet construction requirements, and then promptly dismantle it after construction is completed. However, this traditional practice has the disadvantages of long concrete curing cycles, inability to be recycled, and the generation of large amounts of construction waste. It is not only time-consuming and labor-intensive, but also has a negative impact on the environment. In addition, for projects in some areas, such as photovoltaic construction in the heart of the desert and temporary photovoltaic assembly in seaports, it is not convenient or allowed to harden the site with cast-in-place concrete due to regional environmental regulations. Therefore, it is necessary to develop prefabricated and assembled concrete road slabs that are easy to install and environmentally friendly.

[0003] While traditional concrete road slabs offer high strength, rigidity, and durability, capable of withstanding heavy traffic and mechanical loads and suitable for harsh environments or temporary construction areas, their construction efficiency and turnover rate often fall short of the demands of modern engineering. After installation, prefabricated road slabs are typically subjected to the static and vibration loads of large machinery and vehicles. Since the road slabs are the only path for dynamic mechanical vibrations to propagate to the outside world, existing road slab designs typically focus solely on meeting strength requirements without implementing necessary vibration reduction measures. Engineering vibrations typically range from medium to low frequencies within 100Hz, which closely overlap with the natural frequencies of major human organs (1-80Hz), making them prone to resonance and potentially posing a significant threat to human health.

[0004] In addition, existing road slabs are usually arranged directly on the base layer. Long-term engineering vibrations can easily cause hollowing of the base plate, generating abnormal noise and vibration when heavy vehicles and large machinery pass by, accelerating the damage of the road slab and reducing the turnover rate and service life.

[0005] Therefore, the development of a precast concrete vibration-damping road slab can not only meet the site hardening requirements of engineering projects, but also attenuate the negative impact of engineering vibration on the human body and structure, and improve the turnover rate and service life of the road slab. Summary of the Invention

[0006] In response to the above-mentioned technical problems existing in existing concrete road slabs, the purpose of the present invention is to provide a precast concrete local resonance periodic vibration damping road slab. Compared with previous technologies, the vibration damping road slab proposed in this patent can dissipate the vibration energy generated by engineering vehicles and operating machinery while meeting the strength requirements of the road slab, reduce the negative impact of vibration transmission on the human body and surrounding structures, and achieve efficient installation, construction and turnover use.

[0007] In order to achieve the above-mentioned objectives, the present invention provides a precast concrete local resonance periodic vibration damping road slab, comprising a base layer, a panel layer and a local resonance unit array layer. The local resonance unit array layer is arranged between the base layer and the panel layer and is integrally cast with the base layer and the panel layer to form a precast road slab.

[0008] Furthermore, the local resonance unit array layer includes a mounting plate and a local resonance component, and the local resonance component is embedded in the mounting plate.

[0009] Furthermore, the end surface of the mounting plate is provided with a plurality of independent mounting grooves, which are distributed in a matrix form on the end surface of the mounting plate, and the size of the mounting grooves is the same as that of the local resonance component.

[0010] Furthermore, the local resonance component is composed of several local resonance parts, which are respectively composed of a steel scatterer, a rubber wrapping layer, and a concrete base. The concrete base is provided with a mounting groove. The rubber wrapping layer is wrapped around the steel scatterer and then embedded in the mounting groove of the concrete base to form an integrated structure and is installed in the corresponding mounting groove on the mounting plate.

[0011] Furthermore, a groove is reserved at the edge of the end surface of the panel layer, which is used to set a connection component. The road slab is tightened by setting the connection component and cooperating with the reserved groove.

[0012] Furthermore, the connecting assembly is composed of a connecting steel plate, an adjusting bolt, a steel gasket and a connecting sleeve. The connecting sleeve is pre-embedded in the groove. The adjusting bolt is connected to the connecting steel plate and is connected to the pre-embedded connecting sleeve to achieve a tight connection between the road plates.

[0013] Furthermore, a hoisting sleeve is pre-embedded on the panel layer, and the pre-embedded hoisting sleeve is used for hoisting and installing the precast concrete local resonance periodic vibration damping road slab.

[0014] Furthermore, the periphery of the road slab formed by assembling the base layer, the local resonance unit array layer and the panel layer is covered with a rubber pad.

[0015] The precast concrete local resonance periodic vibration damping road slab provided by the present invention can achieve engineering vibration attenuation effect while meeting the strength requirements of the road slab through a stacked design of arranging a rubber concrete base layer, a local resonance unit array layer, and a rubber concrete panel layer.

[0016] Secondly, through the synergistic effect of local resonant elastic wave bandgap filtering and rubber concrete damping vibration reduction, the vibration reduction performance of the road slab is further enhanced, which can reduce the negative impact of vibration on human health and the working environment.

[0017] In addition, the road plate design proposed in the present invention can be quickly installed and disassembled, which improves construction efficiency and turnover efficiency, can meet the needs of different construction sites and projects, reduces construction waste generated by construction, and reduces project costs. It not only meets environmental protection requirements, but also improves the economic efficiency of the project, achieving dual optimization of economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0019] Figure 1 Schematic diagram of the overall structure of the road slab in the present invention;

[0020] Figure 2 This is a schematic diagram of the exploded structure of the road slab in the present invention;

[0021] Figure 3 This is a schematic diagram of the overall structure of the local resonance component in the road slab of the present invention;

[0022] Figure 4 This is a schematic diagram of the exploded structure of the local resonance component in the road slab of the present invention;

[0023] Figure 5 Schematic diagram of the principle of the local resonance component in the road slab of the present invention;

[0024] Figure 6 Schematic diagram of the structure of the irreducible Brillouin zone in the road plate of the present invention;

[0025] Figure 7 Schematic diagram of the energy band structure in the road plate of the present invention;

[0026] Figure 8 Schematic diagram of the structure of the vibration mold platform in the road slab of the present invention;

[0027] Figure 9 This is a vibration time domain comparison diagram of the present invention and the common prefabricated road slab;

[0028] Figure 10 This is a comparison chart of the vibration spectrum of the present invention and the common prefabricated road slab;

[0029] Figure 11 Parameter analysis diagram showing the influence of the structural parameters of the local resonance components on the band gap in the road slab of the present invention;

[0030] Figure 12 Schematic diagram of the structure of the transmission function in the road plate of the present invention;

[0031] Figure 13 Schematic diagram of the transfer function calculation model in the road slab of the present invention;

[0032] Figure 14 For the vibration displacement distribution cloud chart in the road plate of the application;

[0033] Figure 15 For the exponential decreasing effect diagram of the local resonance mechanism on the vibration displacement in the road plate of the application;

[0034] Figure 16 For the overall structure schematic diagram of the panel layer in the road plate of the application.

[0035] The following is the component labeling explanation in the drawings:

[0036] 100. Road plate 110. Base layer 120. Local resonance unit array layer 121. Mounting plate 1211. Mounting groove 122. Local resonance assembly 1221. Steel scatterer 1222. Rubber wrapping layer 1223. Concrete base 130. Panel layer 131. Connection assembly 1311. Connection steel plate 1312. Adjusting bolt 1313. Steel gasket 1314. Connection sleeve 132. Hoisting sleeve 140. Rubber pad. DETAILED DESCRIPTION

[0037] In order to make the technical means, creative features, purposes and effects realized by the application easy to understand, the following further describes the application in combination with specific drawings.

[0038] In view of the technical problems existing in the existing concrete road plate, the application provides a prefabricated concrete local resonance periodic damping road plate 100, which is shown in Figures 1-2 which comprises a base layer 110, a local resonance unit array layer 120 and a panel layer 130, wherein the base layer 110, the local resonance unit array layer 120 and the panel layer 130 are sequentially stacked, and through the elastic wave band gap filtering effect of the local resonance unit array and the damping effect of the rubber concrete, the attenuation of the engineering vibration generated by the heavy vehicle and the machine is realized.

[0039] The base layer 110 is the base of the prefabricated concrete local resonance periodic damping road plate, and the rubber concrete with damping effect is preferably used for pouring, which can further improve the damping effect.

[0040] The material used for the base layer 110 is not limited as above, and one or more combinations of ordinary concrete, seawater and sea sand concrete, desert sand concrete, solid waste-based concrete, etc. can be used according to regional characteristics, low-carbon demand and cost control.

[0041] The local resonance unit array layer 120 is arranged between the base layer 110 and the panel layer 130, and is coordinated with the base layer 110 and the panel layer 130. The local resonance unit array layer 120 includes a mounting plate 121 and a local resonance component 122. The local resonance component 122 is embedded in the mounting plate 121. Through the elastic wave band gap filtering effect of the local resonance unit array and the damping and vibration reduction effect of the rubber concrete, the engineering vibration generated by heavy-loaded vehicles and machinery is attenuated.

[0042] The mounting plate 121 is a mounting body for the local resonance component. A plurality of independent mounting grooves 1211 are provided on its end surface. The plurality of mounting grooves 1211 are distributed in a matrix form on the end surface of the mounting plate 121. The size of the mounting grooves 1211 is the same as that of the local resonance component 122, so that the local resonance component 122 can be embedded in the mounting grooves 1211.

[0043] The local resonance element 122 is composed of several Figure 3 The local resonance components are composed of several local resonance components, and the several mounting grooves 1211 on the mounting plate 121 are arranged. Figure 4 The local resonance components are composed of a steel scatterer 1221, a rubber wrapping layer 1222, and a concrete matrix 1223.

[0044] The size of the concrete base 1223 matches the mounting groove 1211 on the mounting plate 121, and the concrete base 1223 can be embedded in the mounting groove 1211. At the same time, the concrete base 1223 is also provided with a mounting groove. The rubber wrapping layer 1222 is wrapped around the steel scatterer 1221 and then embedded in the mounting groove of the concrete base 1223 to form an integrated structure. Several local resonance components composed of the steel scatterer 1221, the rubber wrapping layer 1222, and the concrete base 1223 are respectively embedded in the corresponding mounting grooves 1211 on the mounting plate 121, forming a local resonance component 122 with the mounting plate 121. The local resonance component 122 can have an elastic wave band gap within a certain frequency range. The vibration wave of the target frequency passes through the local resonance unit array, resulting in energy localization and dissipation, thereby achieving a band gap filtering and vibration reduction effect.

[0045] For details, see Figures 5-6 According to the phononic crystal theory, periodically arranged local resonance units can produce local resonance band gaps. The figure is a schematic diagram of the local resonance unit and the corresponding irreducible Brillouin zone. By traversing the wave vector along the irreducible Brillouin zone, we can obtain the following: Figure 7 The band structure of the band structure, the horizontal axis is the wave vector, and the vertical axis is the frequency. The colored shaded area has no band curve passing through it, which is the local resonance band gap.

[0046] Extract the vibration modes of the band gap starting point A and the band gap cutoff point B from the energy band curve, such asFigure 8 As shown. The color indicates the relative size of the amplitude, and the arrow indicates the direction of vibration. At the band gap starting frequency, the displacement amplitude of the steel scatterer 1221 is dominant, while the concrete matrix 1223 is almost stationary. The translational vibration of the steel scatterer 1221 generates a resultant force and strongly couples with the long-wave traveling waves in the concrete matrix 1223, opening the local resonance band gap. At the cutoff frequency, the distribution characteristics of the displacement vector field show that the steel scatterer 1221 and the concrete matrix 1223 exhibit significant relative motion, while the concrete matrix 1223 maintains a relatively large displacement amplitude. Compared with the starting frequency, the movement of the steel scatterer 1221 and the concrete matrix 1223 is in opposite directions, and the two exhibit relative motion. The coupling between the steel scatterer 1221 and the concrete matrix 1223 is weakened, resulting in the closure of the local resonance band gap.

[0047] Therefore, during the entire vibration process, when the excitation frequency is in the band gap range and the elastic wave passes through the local resonance structure, the incident wave is reflected and scattered after propagating to the steel scatterer 1221, triggering the local resonance effect of the steel scatterer 1221, and a part of the wave is transmitted back to the rubber wrapping layer 1222 to be reflected and scattered again. This is repeated many times, so that the energy is confined in each resonance unit and continuously converted between kinetic energy and strain energy, resulting in energy superposition in the rubber wrapping layer 1222, forming an energy barrier to prevent the continued propagation of the elastic wave, resulting in the generation of a local resonance band gap, thereby achieving the attenuation of the elastic wave.

[0048] Secondly, several local resonance components in this scheme are preferably distributed in an array because the application of irreducible Brillouin zone and band structure analysis methods must be based on the fact that a single unit cell can characterize the entire local resonance structure. According to the Bragg theorem, only periodic structures with a specific arrangement can use the analysis results of a single unit cell to characterize the vibration reduction characteristics of the entire structure.

[0049] Furthermore, the vibration attenuation effect of the local resonance unit array layer 120 can be controlled by adjusting the material parameters and structural parameters of the local resonance unit according to the ambient vibration main frequency and the target vibration reduction level requirements to meet different engineering requirements. For details, see Figures 9-11 .

[0050] Among them, modifying the geometric dimensions of the local resonance unit can affect the distribution range and width of the band gap. Therefore, by adjusting the structural parameters, the band gap range can be controlled, and then the vibration reduction characteristics of the structure can be controlled.

[0051] The influence of material parameters on band gap is similar. The adjustment of different material parameters and structural parameters will construct local resonance units with different resonance frequencies, which will respond to vibration waves in different ranges, thus having a filtering effect on vibration waves of different frequencies.

[0052] Furthermore, by modifying the number of local resonance units, the vibration reduction effect within the frequency band can be adjusted. As the number of local resonance units increases, the vibration reduction effect gradually increases.

[0053] The vibration reduction effect of precast concrete local resonance periodic vibration reduction road slab is achieved by Figures 12-13 The transmission function is used for evaluation. The range of the transmission function curve below 0 represents the road slab's attenuation of vibration waves. Smaller transmission function values ​​indicate a stronger attenuation of vibration waves at that frequency. Therefore, the frequency response functions of different local resonance units exhibit similar development trends. Furthermore, as the number of local resonance units increases, the transmission loss in the attenuation area increases, and the attenuation effect becomes more uniform.

[0054] Since the road slab attenuates vibration waves through local resonance, see Figures 14-15 That is, when the frequency within the band gap range is transmitted into the structure, it will cause the resonance of the local resonance unit, which will lead to the localization of energy and the exponential decrease of the vibration displacement. This localization phenomenon gradually becomes significant with the increase of the propagation path, that is, increasing the number of local resonance units will enhance the vibration reduction effect of the structure.

[0055] In addition, the mounting plate area in the local resonance unit array layer is preferably cast with rubber concrete, which can give play to the synergistic effect of local resonance elastic wave band gap filtering and rubber concrete damping and vibration reduction, dissipate the vibration energy generated by engineering vehicles and operating machinery, reduce the negative impact of vibration propagation on the human body and surrounding structures, and further improve the vibration attenuation effect.

[0056] The panel layer 130 is the surface layer of the precast concrete local resonance periodic vibration damping road slab. In this solution, rubber concrete with vibration damping effect is preferably used to further improve the vibration damping effect.

[0057] This solution does not impose the above-mentioned restrictions on the materials used for the panel layer 130. One or more combinations of ordinary concrete, seawater and sea sand concrete, desert sand concrete, solid waste-based concrete, etc. can also be used according to regional characteristics and low-carbon requirements.

[0058] Further, see Figure 1 and Figure 16 A groove is reserved at the edge of the end face of the panel layer 130, which is used to set the connecting component 131. The connecting component 131 is composed of a connecting steel plate 1311, an adjusting bolt 1312, a steel gasket 1313 and a connecting sleeve 1314.

[0059] The connecting steel plate 1311 includes a first connecting plate and a second connecting plate. The first connecting plate and the second connecting plate are connected in a cooperative manner, and connecting holes are respectively provided on the first connecting plate and the second connecting plate.

[0060] The connecting holes on the first connecting plate and the second connecting plate are respectively provided with adjusting bolts 1312, one of the adjusting bolts 1312 cooperates with the steel gasket 1313 to be connected with the connecting sleeve 1314 embedded in the groove, and the tight connection effect of the road plate is achieved by setting the connection component 131 to cooperate with the reserved groove.

[0061] Since the base layer 110 , the local resonance unit array layer 130 and the panel layer 130 are cast together, the connecting sleeve 1314 only needs to be embedded in 1 / 3 of the position to provide sufficient restraint force.

[0062] After the connection component 131 is installed in the groove on the panel layer 130 and assembled, the upper surface of the connection component 131 should be kept flush with the top surface of the panel layer 130 to ensure that the heavy-loaded vehicles and operating machinery on the upper part can run smoothly.

[0063] Secondly, a hoisting sleeve 132 is pre-embedded on the panel layer 130. The pre-embedded hoisting sleeve 132 is used in conjunction with the eye screw to realize the hoisting and installation of the precast concrete local resonance periodic vibration damping road slab.

[0064] After the base layer 110, the local resonance unit array layer 120 and the panel layer 130 are assembled to form the road slab 100, the outer periphery thereof can be covered and encapsulated with rubber pads 140. This not only prevents moisture from penetrating into the foundation through the slab seams to form hollowing, but also prevents damage caused by chipping and breaking due to bumps during the installation process, thereby improving the turnover rate and service life of the road slab.

[0065] The present invention does not limit the configuration of the rubber pad 140 on the periphery of the road slab 100. For example, the entire periphery of the formed road slab 100 except for the lifting sleeve 132 and the connecting assembly 131 may be covered with the rubber pad 140, or the connecting seam of the formed road slab 100 may be covered with the rubber pad 140. The specific configuration of the rubber pad 140 may be determined according to actual conditions.

[0066] The precast concrete local resonance periodic vibration damping road slab formed by the above scheme can achieve the engineering vibration attenuation effect on the basis of meeting the strength requirements of the road slab through the stacking design of setting a rubber concrete base layer, a local resonance unit array layer, and a rubber concrete panel layer.

[0067] Secondly, through the synergistic effect of local resonant elastic wave bandgap filtering and rubber concrete damping vibration reduction, the vibration reduction performance of the road slab is further enhanced, which can reduce the negative impact of vibration on human health and the working environment.

[0068] In addition, the road plate design proposed in the present invention can be quickly installed and disassembled, which improves construction efficiency and turnover efficiency, can meet the needs of different construction sites and projects, reduces construction waste generated by construction, and reduces project costs. It not only meets environmental protection requirements, but also improves the economic efficiency of the project, achieving dual optimization of economic and environmental benefits.

[0069] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A precast concrete local resonance periodic vibration damping road slab, characterized in that: The prefabricated road slab comprises a base layer, a panel layer and a local resonance unit array layer, wherein the local resonance unit array layer is arranged between the base layer and the panel layer and is integrally cast with the base layer and the panel layer to form a prefabricated road slab; The local resonance unit array layer includes a mounting plate and a local resonance component, wherein the local resonance component is embedded in the mounting plate; The local resonance assembly is composed of a plurality of local resonance components, each of which is composed of a steel scatterer, a rubber wrapping layer, and a concrete base. The concrete base is provided with a mounting groove. The rubber wrapping layer is wrapped around the steel scatterer and then embedded in the mounting groove of the concrete base to form an integrated structure and is installed in the corresponding mounting groove on the mounting plate. A groove is reserved at the edge of the end surface of the panel layer, which is used to set the connection component. The road plate is tightly connected by setting the connection component and cooperating with the reserved groove; The connecting assembly is composed of a connecting steel plate, an adjusting bolt, a steel washer and a connecting sleeve. The connecting sleeve is pre-buried in the groove. The adjusting bolt is connected to the connecting steel plate and the steel washer is connected to the pre-buried connecting sleeve to achieve a tight connection between the road plates. The periphery of the road slab formed by assembling the base layer, the local resonance unit array layer and the panel layer is covered with a rubber pad.

2. The precast concrete local resonance periodic vibration damping road slab according to claim 1, characterized in that: The end surface of the mounting plate is provided with a plurality of independent mounting grooves, which are distributed on the end surface of the mounting plate in a matrix form. The size of the mounting grooves is the same as that of the local resonance component.

3. The precast concrete local resonance periodic vibration damping road slab according to claim 1, characterized in that: A hoisting sleeve is pre-embedded on the panel layer, and the pre-embedded hoisting sleeve is used for hoisting and installing the precast concrete local resonance periodic vibration damping road slab.

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