CN216238664U - Pier/pile foundation column shell vibration isolation structure based on local resonance mechanism - Google Patents
Pier/pile foundation column shell vibration isolation structure based on local resonance mechanism Download PDFInfo
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- CN216238664U CN216238664U CN202122767883.7U CN202122767883U CN216238664U CN 216238664 U CN216238664 U CN 216238664U CN 202122767883 U CN202122767883 U CN 202122767883U CN 216238664 U CN216238664 U CN 216238664U
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Abstract
A pier/pile foundation column shell vibration isolation structure based on a local resonance mechanism comprises a concrete outer protective layer (1), a concrete cover plate (5), a concrete base (6) and a local resonance type vibration isolation component; the vibration isolation structure is a circular cylindrical shell structure tightly wrapped outside the bridge pier or the pile foundation (2). A local resonance type vibration isolation component is arranged in the circular cylindrical shell structure; the local resonance type vibration isolation component comprises a rubber base body (4) and a metal columnar body (3) embedded in the base body; the rubber matrix 4 is filled by mincing waste rubber products. The vibration isolation assembly is simple in structure and easy to obtain materials, and waste tires can be selected as rubber base materials; the metal scatterer can be made of waste steel by post-processing, and the vibration isolation effect is obvious. The maximum vibration isolation effect of the utility model can reach about 15 dB. The vibration isolation structure is bidirectional vibration isolation, can weaken the propagation of the vibration of the bridge pier/pile foundation to the surrounding soil body, and can also reduce the influence of the vibration of the soil body on the bridge pier.
Description
Technical Field
The utility model relates to a pier/pile foundation column shell vibration isolation structure based on a local resonance mechanism, and belongs to the technical field of vibration isolation of bridge pile bodies.
Background
With the rapid development of the overhead rail transit, the problems of bridge structure vibration and noise caused by train load excitation become more prominent day by day. Especially, when the viaduct passes through residential areas and urban areas, the environmental vibration and noise pollution caused by the viaduct have adverse effects on the working and living health of neighboring residents along the line, the normal use of neighboring buildings and precise instruments, and the like, and become the most representative environmental problems.
The local resonance mechanism belongs to a phononic crystal theory, namely, an elastic wave band gap can be generated by enabling a material structure to present a certain periodicity, and an elastic wave signal in an elastic wave forbidden band frequency range cannot pass through the elastic wave band gap, so that the local resonance mechanism is gradually applied to the field of vibration isolation and noise reduction in recent years.
Through designing different material component collocation and periodic structure forms, the vibration signal in a certain frequency band can be effectively isolated, so that the phononic crystal has wide application prospect in the field of vibration isolation and noise reduction.
Disclosure of Invention
The utility model aims to solve the problems of bridge structure vibration and noise caused by train load excitation, and discloses a pier/pile foundation column shell vibration isolation structure based on a local resonance mechanism.
The technical scheme of the utility model is that the pier/pile foundation column shell vibration isolation structure based on the local resonance mechanism comprises a concrete outer protective layer, a concrete cover plate, a concrete base and a local resonance type vibration isolation component; the vibration isolation structure is a circular cylindrical shell structure tightly wrapped outside the bridge pier or the pile foundation; a local resonance type vibration isolation component is arranged in the circular cylindrical shell structure; the upper part of the circular cylindrical shell structure is provided with a concrete cover plate, the lower part of the circular cylindrical shell structure is provided with a concrete base, the circumference of the circular cylindrical shell structure is provided with a concrete outer protective layer, and the circular cylindrical shell structure, the concrete cover plate, the concrete base and the concrete outer protective layer are connected in a seamless mode.
The local resonance type vibration isolation component comprises a rubber substrate and a scatterer embedded in the substrate; the rubber matrix is filled with waste rubber products in a grinding mode; the scatterers are metal columnar bodies, are perpendicular to the concrete base and are uniformly distributed between the concrete cover plate and the concrete base.
The metal columnar body is a cylinder, a quadrangular prism or a polygonal prism.
The metal cylindrical bodies are distributed in the vertical direction of the inner circumference of the circular cylindrical shell structure; the metal columnar bodies are uniformly distributed outside the bridge pier or the pile foundation to form a concentric circumference surrounding the bridge pier or the pile foundation, the metal columnar bodies are distributed at least two circles, and the number of the metal columnar bodies uniformly distributed on the inner circumference and the outer circumference is the same; the connecting line of the centers of the two adjacent circles of metal cylindrical bodies on the same cross section is in the same straight line with the center of the pier or the pile foundation; the shapes of the metal cylinders uniformly distributed on the same circle are the same; the shapes of the metal cylinders distributed on two adjacent circles on the same cross section are the same, but the diameter of the cross section is larger than that of the inner circle.
The number of the metal columns uniformly distributed on the circumference can be equal to 360 degrees on the circumference.
The thickness of the concrete protective layer is 150 mm; and C20 concrete is used for pouring.
The concrete protective layer comprises a concrete outer protective layer, a concrete cover plate and a concrete base.
The working principle of the utility model is as follows: the local resonance mechanism belongs to a phononic crystal theory, namely, an elastic wave band gap can be generated by enabling a material structure to present certain periodicity, and an elastic wave signal in an elastic wave forbidden band frequency range cannot pass through the elastic wave band gap. When the vibration of the pile foundation or the pier is transversely transmitted to the vibration isolation assembly, the surface vibration deformation of the phononic crystal base body (namely the rubber material filling layer) is reduced; the maximum deformation occurs near the scatterer, i.e. the metal cylinder, i.e. the resonance of the scatterer replaces the motion of the substrate surface, and the vibration energy is consumed by the local resonance of the scatterer.
When the metal columnar bodies with different cross-sectional areas are adopted, different mass forms different filling ratios of the scatterers and different local resonance frequencies (as shown in fig. 5), so that the vibration isolation capability covering low frequency and medium-high frequency can be realized. Compared with the filling ratio of a single scatterer (as shown in figure 1), the vibration isolation device has wider frequency isolation capability.
The utility model has the advantages that the transmission of the vibration of the axle to the surrounding environment can be effectively blocked based on the local resonance phononic crystal theory and the vibration damping effect of the rubber material, and the adjustment of the vibration isolation frequency can be realized by adjusting the periodic structural form of the phononic crystal, so that the vibration isolation requirement of civil engineering can be better met.
The vibration isolation assembly is simple in structure and easy to obtain materials, the rubber base material can be obtained by post-processing of waste tires and the like, the metal scatterer can be manufactured by post-processing of waste steel, and the vibration isolation effect is obvious. Through numerical simulation calculation, the maximum vibration isolation effect of the vibration isolator can reach about 15 dB.
The vibration isolation structure is bidirectional vibration isolation, so that the propagation of the vibration of the pier/pile foundation to the surrounding soil body can be weakened, and the influence of the vibration of the soil body on the pier can be reduced.
Drawings
FIG. 1 is a cross-sectional view of a column casing vibration isolation structure;
FIG. 2 is a sectional view taken along the vertical section A-A of the vibration isolation structure of the column housing;
FIG. 3 is a schematic cross-sectional view of a metal cylinder of a cylindrical shell vibration isolation structure being a quadrangular prism;
FIG. 4 is a schematic cross-sectional view of lattice constant II;
FIG. 5 is a schematic cross-sectional view of fill ratio II;
in the figure, 1 is a concrete outer protective layer; 2 is a bridge pier or a pile foundation; 3 is a metal column (cylindrical); 4 is a rubber matrix; 5 is a concrete cover plate; 6 is a concrete base; the reference numeral 7 denotes a metal columnar body (quadrangular prism shape).
Detailed Description
The embodiments of the present invention are shown in fig. 1 to 5.
As shown in fig. 2, the vibration isolation structure for a pier/pile foundation shell based on a local resonance mechanism in the present embodiment includes a concrete outer protective layer 1, a concrete cover plate 5, a concrete base 6, and a local resonance type vibration isolation assembly.
The vibration isolation structure of the embodiment is a circular cylindrical shell structure which is tightly wrapped outside the bridge pier or the pile foundation 2; a local resonance type vibration isolation component is arranged in the circular cylindrical shell structure; the upper part of the circular cylindrical shell structure is provided with a concrete cover plate 5, the lower part of the circular cylindrical shell structure is provided with a concrete base 6, the circumference of the circular cylindrical shell structure is provided with a concrete outer protective layer 1, and the circular cylindrical shell structure, the concrete cover plate and the concrete base are connected in a seamless mode.
The local resonance type vibration isolation component comprises a rubber base 4 and a scatterer embedded in the base; the rubber matrix 4 is filled by mincing waste rubber products; the scatterers are metal columnar bodies 3 and 7, are perpendicular to the concrete base 6, and are uniformly distributed between the concrete cover plate 5 and the concrete base 6.
The metal columnar body is a cylinder, a quadrangular prism or a polygonal prism.
Each metal cylinder 3 or 7 and the rubber matrix 4 constitute a typical "mass-spring" system. The concrete outer protective layer 1, the concrete cover plate 5 and the concrete base 6 protect the internal rubber matrix 4 material to prevent rubber oxidation.
The metal cylinders of this embodiment are distributed in the vertical direction of the inner circumference of the cylindrical shell structure, as shown in fig. 2. The metal columnar bodies are uniformly distributed outside the bridge pier or the pile foundation to form a concentric circumference surrounding the bridge pier or the pile foundation, the metal columnar bodies are distributed at least two times, and the number of the metal columnar bodies uniformly distributed on the inner circumference and the outer circumference is the same, as shown in fig. 3-5; the connecting line of the centers of the two adjacent circles of metal cylindrical bodies on the same cross section is in the same straight line with the center of the pier or the pile foundation; the shapes of the metal cylinders uniformly distributed on the same circle are the same, as shown in fig. 3 and 4; the metal cylinders distributed on two adjacent circles on the same cross section have the same shape, but the cross section diameter is the same, and the outer circle is larger than the inner circle, as shown in fig. 5.
When the metal columnar bodies with different cross-sectional areas are adopted, different mass forms different filling ratios of the scatterers and different local resonance frequencies (as shown in fig. 5), so that the vibration isolation capability covering low frequency and medium-high frequency can be realized. Compared with the filling ratio of a single scatterer (as shown in figure 1), the vibration isolation device has wider frequency isolation capability.
By designing different lattice coefficients and lattice shapes, the vibration isolation bandwidth expansion of medium and high frequency bands can be realized. As shown by comparing fig. 1 and fig. 4, different lattice coefficients d1 and d2 produce different vibration isolation frequency bands. The forbidden frequency has a certain relationship with the lattice coefficient: wavelength (corresponding to center frequency) =1/2 × lattice coefficient.
Wherein the lattice coefficient is the distance between the centers of adjacent phononic crystal unit cells. Therefore, by adopting a plurality of lattice coefficients, the bandwidth can be effectively increased, and larger and wider frequency band vibration absorption capacity is provided.
The parameters such as the size of the scatterer, the lattice coefficient and the like are designed according to engineering requirements.
Example 1
The local resonance type vibration isolation assembly of the present embodiment employs a cylindrical metal cylindrical body 3, and the cross section of the pier/pile shell vibration isolation structure of the present embodiment is shown in fig. 1.
In the embodiment, two circles of cylindrical metal columnar bodies 3 are arranged between the pier/pile foundation 2 and the concrete outer protective layer 1, and 12 cylindrical metal columnar bodies 3 with equal cross section diameters are arranged in the circumferential direction of each circle; from the center of the pier/pile foundation 2, on the cross section, the extension line of the connecting line of the centers of the two adjacent circles of the metal columnar bodies 3 passes through the center.
Example 2
The local resonance type vibration isolation assembly of the present embodiment uses a quadrangular prism-shaped metal columnar body 7, and the cross section of the pier/pile foundation shell vibration isolation structure of the present embodiment is shown in fig. 3.
In the embodiment, two circles of quadrangular cylindrical metal bodies 7 are arranged between the pier/pile foundation 2 and the concrete outer protective layer 1, and 12 quadrangular cylindrical metal bodies 7 with the same cross section diameter are arranged in the circumferential direction of each circle; from the center of the pier/pile foundation 2, on the cross section, an extension line of a connecting line of the centers of two adjacent quadrangular cylindrical metal bodies 7 passes through the center.
Example 3
The local resonance type vibration isolation assembly of the present embodiment employs a cylindrical metal cylindrical body 3, and the cross-section of the pier/pile shell vibration isolation structure of the present embodiment is shown in fig. 4.
In the embodiment, three circles of cylindrical metal cylindrical bodies 3 are arranged between the pier/pile foundation 2 and the concrete outer protective layer 1, and 6 cylindrical metal cylindrical bodies 3 with equal cross section diameters are arranged in the circumferential direction of each circle; from the center of the pier/pile foundation 2, on the cross section, the extension line of the connecting line of the centers of the three adjacent metal cylindrical bodies 3 passes through the center.
Example 4
The local resonance type vibration isolation assembly of the present embodiment employs a cylindrical metal cylindrical body 3, and the cross-section of the pier/pile shell vibration isolation structure of the present embodiment is shown in fig. 5.
In the embodiment, two circles of cylindrical metal columnar bodies 3 are arranged between the pier/pile foundation 2 and the concrete outer protective layer 1, and 12 cylindrical metal columnar bodies 3 with equal cross section diameters are arranged in the same circle in the circumferential direction; the diameter of the cross section of the cylindrical metal cylindrical body 3 of the outer ring is larger than that of the cross section of the cylindrical metal cylindrical body 3 of the inner ring; from the center of the pier/pile foundation 2, on the cross section, the extension line of the connecting line of the centers of the two adjacent circles of the metal columnar bodies 3 passes through the center.
Claims (6)
1. A pier/pile foundation column shell vibration isolation structure based on a local resonance mechanism is characterized in that the vibration isolation structure comprises a concrete outer protective layer, a concrete cover plate, a concrete base and a local resonance type vibration isolation assembly; the vibration isolation structure is a circular cylindrical shell structure tightly wrapped outside the bridge pier or the pile foundation; a local resonance type vibration isolation component is arranged in the circular cylindrical shell structure; the upper part of the circular cylindrical shell structure is provided with a concrete cover plate, the lower part of the circular cylindrical shell structure is provided with a concrete base, the circumference of the circular cylindrical shell structure is provided with a concrete outer protective layer, and the circular cylindrical shell structure, the concrete cover plate, the concrete base and the concrete outer protective layer are connected in a seamless mode.
2. The pier/pile foundation column shell vibration isolation structure based on the local resonance mechanism of claim 1, wherein the local resonance type vibration isolation assembly comprises a rubber matrix and a diffuser embedded in the matrix; the rubber matrix is filled with waste rubber products in a grinding mode; the scatterers are metal columnar bodies, are perpendicular to the concrete base and are uniformly distributed between the concrete cover plate and the concrete base.
3. The pier/pile foundation shell vibration isolation structure based on the local resonance mechanism of claim 2, wherein the metal cylinder is a cylinder or a polygonal cylinder.
4. The pier/pile foundation column shell vibration isolation structure based on the local resonance mechanism of claim 2, wherein the metal columns are distributed in a vertical direction of the inner circumference of the circular column shell structure; the metal columnar bodies are uniformly distributed outside the bridge pier or the pile foundation to form a concentric circumference surrounding the bridge pier or the pile foundation, the metal columnar bodies are distributed at least two circles, and the number of the metal columnar bodies uniformly distributed on the inner circumference and the outer circumference is the same; the connecting line of the centers of the two adjacent circles of metal cylindrical bodies on the same cross section is in the same straight line with the center of the pier or the pile foundation; the shapes of the metal cylinders uniformly distributed on the same circle are the same; the shapes of the metal cylinders distributed on two adjacent circles on the same cross section are the same, but the diameter of the cross section is larger than that of the inner circle.
5. The pier/pile foundation column shell vibration isolation structure based on the local resonance mechanism as claimed in claim 4, wherein the number of the metal columns uniformly distributed on the circumference is equal to 360 ° of the circumference.
6. The pier/pile foundation column shell vibration isolation structure based on the local resonance mechanism of claim 1, wherein the thickness of the concrete outer protective layer is 150 mm; and C20 concrete is used for pouring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122767883.7U CN216238664U (en) | 2021-11-12 | 2021-11-12 | Pier/pile foundation column shell vibration isolation structure based on local resonance mechanism |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122767883.7U CN216238664U (en) | 2021-11-12 | 2021-11-12 | Pier/pile foundation column shell vibration isolation structure based on local resonance mechanism |
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| CN216238664U true CN216238664U (en) | 2022-04-08 |
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| CN202122767883.7U Active CN216238664U (en) | 2021-11-12 | 2021-11-12 | Pier/pile foundation column shell vibration isolation structure based on local resonance mechanism |
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2021
- 2021-11-12 CN CN202122767883.7U patent/CN216238664U/en active Active
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