Spliced acoustic black hole vibration reduction pile and use method

Abstract

The present application relates to the technical field of vibration reduction, and particularly relates to a spliced acoustic black hole vibration reduction pile and a use method, which comprises a composite pile body, a stepped spliced acoustic black hole module, a shock isolation support layer and a magnetic ball eddy current damping module, the composite pile body is vertically buried in the foundation, the stepped spliced acoustic black hole module is arranged in the interior of the composite pile body, the shock isolation support layer is installed on the top of the composite pile body, the magnetic ball eddy current damping module is installed on the upper portion of the shock isolation support layer, the magnetic ball eddy current damping module is used for supporting the upper building structure, the ring units with different thicknesses are welded, the overall outer contour is fitted with a power law curve, the thickness of the acoustic black hole ring is gradually thinned, the seismic wave is attenuated through the acoustic black hole ring, and the horizontal seismic force with extremely great damage is converted into vertical pressure that can be tolerated by the composite pile body and dissipated through the magnetic ball modal conversion mechanism.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, specifically to a spliced ​​acoustic black hole vibration reduction pile and its usage method. Background Technology

[0002] As the most widely used foundation form in civil engineering, the dynamic response characteristics and seismic safety of pile foundations in high-intensity earthquake areas have always been the focus of the engineering community. The acoustic black hole effect, as a cutting-edge wave control theory, provides a new approach to solving this problem. Its core mechanism is to induce a significant reduction in the flexural wave velocity and energy accumulation in a specific area through the power-law gradual change of structural impedance. At this time, only a small amount of damping material is needed to achieve efficient dissipation of vibration energy.

[0003] An ideal acoustic black hole ring requires a continuously varying smooth power-law surface, which necessitates high-precision five-axis CNC machining. This results in extremely high costs and low processing efficiency, making it difficult to achieve large-scale standardized manufacturing in construction projects. To address these issues, a spliced ​​acoustic black hole vibration damping pile and its application method are proposed. Summary of the Invention

[0004] In order to solve the technical problems existing in the prior art, the present invention provides a spliced ​​acoustic black hole vibration reduction pile and a method of using it.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a spliced ​​acoustic black hole vibration reduction pile, comprising a composite pile body, a stepped spliced ​​acoustic black hole module, a seismic isolation bearing layer and a magnetic ball eddy current damping module;

[0006] The composite pile body is vertically embedded in the foundation;

[0007] The stepped, spliced ​​acoustic black hole module is installed inside the composite pile body;

[0008] The seismic isolation bearing layer is installed on the top of the composite pile body;

[0009] The magnetic ball bearing eddy current damping module is installed on the upper part of the seismic isolation bearing layer, and the magnetic ball bearing eddy current damping module is used to support the upper building structure.

[0010] Preferably, the composite pile body includes an outer pile shell and an inner pile core arranged coaxially. Both the outer pile shell and the inner pile core are integrally cast from reinforced concrete. The stepped splicing acoustic black hole module is embedded between the outer pile shell and the inner pile core as a pre-embedded part. The two sides of the stepped splicing acoustic black hole module are respectively connected to the outer pile shell and the inner pile core.

[0011] Preferably, the stepped acoustic black hole module is composed of several ring units spliced ​​together, and the thickness of the ring units decreases in a stepped manner from bottom to top. The surface of the ring unit with the smallest thickness is coated with an elastic damping material.

[0012] Preferably, the seismic isolation bearing layer includes a steel pad, an elastic support assembly, and a vertical damper. The steel pad is embedded in the top of the composite pile body as a pre-embedded part. The steel pad is connected to both the outer pile shell and the inner pile core. The elastic support assembly is installed in the middle of the surface of the steel pad, and the vertical damper is installed at the center of the surface of the steel pad. The top of the vertical damper is on the same plane as the top of the elastic support assembly.

[0013] Preferably, the elastic support assembly includes several springs of the same specification, which are arranged in a ring at equal intervals on the surface of the steel pad.

[0014] Preferably, the magnetic ball eddy current damping module includes a lower steel plate, which is installed on the top of the elastic support assembly and the vertical damper. An upper steel plate is provided above the lower steel plate. The surface of the lower steel plate is provided with several sets of lower hemispherical grooves, and the surface of the upper steel plate is provided with several sets of upper hemispherical grooves that match the lower hemispherical grooves.

[0015] Each set of lower hemispherical grooves is provided with a set of lower hemispherical shells inside, and each set of upper hemispherical grooves is provided with a set of upper hemispherical shells that cooperate with the lower hemispherical shells inside. The lower hemispherical shells and the upper hemispherical shells form a spherical cavity, and magnetic balls are provided in the spherical cavity.

[0016] Preferably, both the upper and lower hemispherical shells are made of a good conductor of metal material, and the lower and upper hemispherical shells serve as carriers for eddy current generation.

[0017] A method for using a spliced ​​acoustic black hole vibration damping pile includes the following steps:

[0018] Step S1: Determine the specifications and dimensions of the composite pile body, and determine the specifications and dimensions of the stepped splicing acoustic black hole module based on the specifications and dimensions of the composite pile body.

[0019] Step S2: Fabricate the stepped acoustic black hole module according to the specifications and dimensions of the stepped splicing acoustic black hole module.

[0020] Step S3: When making the composite pile body, install the stepped splicing acoustic black hole module inside the composite pile body, install the seismic isolation bearing layer on the top of the composite pile body, and install the magnetic ball eddy current damping module on the top of the seismic isolation bearing layer.

[0021] Preferably, in step S2, the step of determining the size of the stepped acoustic black hole module is as follows:

[0022] Establish a power-law formula for determining the specifications of an acoustic black hole ring:

[0023] ;

[0024] in, The thickness of the acoustic black hole ring under ideal conditions. This is the truncation value. It is a constant. The power exponent. L is the total effective arc length of the acoustic black hole ring along the energy propagation path. It is the arc length of the acoustic black hole ring extending from the thickest end to the thinnest end;

[0025] In step S2, the power-law formula is discretized, and the acoustic black hole ring is divided into... Segment ring unit, the first Segmented ring unit Uniform thickness The calculation formula is:

[0026] ;

[0027] in, For the first The coordinates of the arc length of the center point of the spiral path of the ring element.

[0028] Preferably, based on the calculated first... Segmented ring unit Uniform thickness Each ring unit is manufactured individually, and the ring units are spliced ​​together to obtain a stepped spliced ​​acoustic black hole module.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] 1. This invention proposes a stepped splicing acoustic black hole module. By welding together ring units of different thicknesses, the overall outer contour conforms to a power-law curve, making the thickness of the acoustic black hole ring gradually thinner. The stepped splicing acoustic black hole module attenuates seismic waves, and uses a magnetic ball bearing mode conversion mechanism to convert the highly destructive horizontal seismic force into vertical pressure that the composite pile body can withstand and dissipate it.

[0031] 2. In this invention, the stepped structure of the stepped acoustic black hole module retains the solid thickness of each unit, ensuring the overall stiffness and bearing capacity of the composite pile body. This allows the stepped acoustic black hole module to be used directly as a load-bearing component. When introduced into pile foundation design, it can directly attenuate energy in the wave propagation path, thereby achieving the purpose of reducing seismic response and improving the seismic toughness of the foundation structure from the source. Attached Figure Description

[0032] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0033] Figure 2 This is a schematic diagram of the three-dimensional unfolded structure of the present invention;

[0034] Figure 3 This is a schematic diagram of the stepped splicing acoustic black hole module structure of the present invention;

[0035] Figure 4 This is a schematic diagram of the seismic isolation bearing layer structure of the present invention;

[0036] Figure 5 This is a schematic diagram of the structure of the magnetic ball eddy current damping module of the present invention.

[0037] The numbers in the image represent:

[0038] 1. Composite pile body; 11. Outer pile shell; 12. Inner pile core; 2. Stepped splicing acoustic black hole module; 21. Ring unit; 3. Seismic isolation bearing layer; 31. Steel pad; 32. Elastic support component; 33. Vertical damper; 4. Magnetic ball eddy current damping module; 41. Lower steel plate; 42. Upper steel plate; 43. Spherical cavity; 431. Lower hemispherical shell; 432. Upper hemispherical shell; 44. Magnetic ball. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments, which illustrate the above and other technical features and advantages of the present invention. However, the following embodiments are merely preferred embodiments of the present invention and are not exhaustive.

[0040] Example:

[0041] like Figures 1-5 As shown, the present invention provides a spliced ​​acoustic black hole vibration reduction pile, including a composite pile body 1, a stepped spliced ​​acoustic black hole module 2, a seismic isolation bearing layer 3, and a magnetic ball eddy current damping module 4.

[0042] The composite pile body 1 is vertically embedded in the foundation;

[0043] The stepped, interlocking acoustic black hole module 2 is installed inside the composite pile body 1;

[0044] Seismic isolation bearing layer 3 is installed on top of composite pile body 1;

[0045] The magnetic ball eddy current damping module 4 is installed on the upper part of the seismic isolation bearing layer 3 to support the upper building structure.

[0046] The composite pile body 1 includes an outer pile shell 11 and an inner pile core 12 arranged coaxially. Both the outer pile shell 11 and the inner pile core 12 are integrally cast from reinforced concrete. The stepped splicing acoustic black hole module 2 is embedded between the outer pile shell 11 and the inner pile core 12 as a pre-embedded part. The two sides of the stepped splicing acoustic black hole module 2 are connected to the outer pile shell 11 and the inner pile core 12 respectively. The stepped splicing acoustic black hole module 2, together with the outer pile shell 11 and the inner pile core 12, forms a waveguide channel. The waveguide channel guides the propagation and energy focusing of elastic waves, i.e. seismic waves. The waveguide channel will directionally guide the vibration energy transmitted along the composite pile body 1 into the stepped splicing acoustic black hole module 2.

[0047] The stepped acoustic black hole module 2 is composed of several ring units 21. The thickness of the ring units 21 decreases in a stepped manner from bottom to top. The surface of the ring unit 21 with the smallest thickness is coated with an elastic damping material. The stepped acoustic black hole module 2 utilizes the change in structure from thick to thin, and the wave energy flows from the thick end to the thin end. This causes the thinnest step of the ring unit 21 to generate a high-amplitude local bending vibration greater than the overall structure. As the wave propagates, the wave speed gradually decreases and the amplitude gradually increases. This effectively accumulates the wave energy at the damping layer position with the thinnest thickness, causing the damping material covering the surface to undergo violent deformation. The elastic damping material further consumes the vibration through violent deformation, while preventing the thinnest step from being damaged by vibration.

[0048] The seismic isolation bearing layer 3 includes a steel pad 31, an elastic support assembly 32, and a vertical damper 33. The steel pad 31 is embedded in the top of the composite pile body 1 as a pre-embedded part. The steel pad 31 is connected to both the outer pile shell 11 and the inner pile core 12. The elastic support assembly 32 is installed in the middle of the surface of the steel pad 31. The vertical damper 33 is installed at the center of the surface of the steel pad 31. The top of the vertical damper 33 is on the same plane as the top of the elastic support assembly 32. The elastic support assembly 32 contains several springs of the same specification. The several springs of the same specification are arranged in a ring at equal intervals on the surface of the steel pad 31.

[0049] The magnetic ball eddy current damping module 4 includes a lower steel plate 41, which is installed on the top of the elastic support component 32 and the vertical damper 33. An upper steel plate 42 is provided above the lower steel plate 41. Several sets of lower hemispherical grooves are formed on the surface of the lower steel plate 41, and several sets of upper hemispherical grooves matching the lower hemispherical grooves are formed on the surface of the upper steel plate 42.

[0050] Each set of lower hemispherical grooves is provided with a set of lower hemispherical shells 431, and each set of upper hemispherical grooves is provided with a set of upper hemispherical shells 432 that cooperate with the lower hemispherical shells 431. The lower hemispherical shells 431 and the upper hemispherical shells 432 form a spherical cavity 43. Magnetic balls 44 are provided in the spherical cavity 43. Both the lower hemispherical shells 431 and the upper hemispherical shells 432 are made of a good conductor of metal material, and the lower hemispherical shells 431 and the upper hemispherical shells 432 serve as carriers for the generation of eddy currents.

[0051] When vibration occurs, the lateral vibration causes the magnetic ball 44 to roll along the lower hemisphere shell 431. As the magnetic ball 44 rolls upward along the lower hemisphere shell 431, it converts the lateral motion into an additional vertical pressure on the bottom of the lower hemisphere shell 431. At the same time, the magnetic ball 44 cuts the lower hemisphere shell 431 during its movement, generating electromagnetic eddy current damping. The motion of the magnetic ball 44 cutting the magnetic field lines induces an eddy current magnetic field in the lower hemisphere shell 431. According to Lenz's law, the eddy current induced magnetic field opposes the relative motion between the magnetic ball 44 and the original magnetic field, generating eddy current damping. Simultaneously, the induced eddy current closed loop in the lower hemisphere shell 431 converts the vibration energy into heat energy and dissipates it through the resistance effect of the lower hemisphere shell 431, achieving the purpose of energy dissipation and vibration reduction.

[0052] A method for using a spliced ​​acoustic black hole vibration damping pile includes the following steps:

[0053] Step S1: Determine the specifications and dimensions of the composite pile body 1, and determine the specifications and dimensions of the stepped splicing acoustic black hole module 2 based on the specifications and dimensions of the composite pile body 1.

[0054] Step S2: Fabricate the stepped acoustic black hole module 2 according to its specifications and dimensions; the steps for determining the dimensions of the stepped acoustic black hole module 2 in step S2 are as follows:

[0055] Establish a power-law formula for determining the specifications of an acoustic black hole ring:

[0056] ;

[0057] in, The thickness of the acoustic black hole ring under ideal conditions. This is the truncation value. It is a constant. The power exponent. L is the total effective arc length of the acoustic black hole ring along the energy propagation path. It is the arc length of the acoustic black hole ring extending from the thickest end to the thinnest end;

[0058] In step S2, the power-law formula is discretized, and the acoustic black hole ring is divided into... Segment ring unit, the first Segmented ring unit Uniform thickness The calculation formula is:

[0059] ;

[0060] in, For the first The arc length coordinates of the center point of the spiral path of the ring element;

[0061] Step S3: When making the composite pile body 1, install the stepped splicing acoustic black hole module 2 inside the composite pile body 1, install the seismic isolation bearing layer 3 on the top of the composite pile body 1, and install the magnetic ball eddy current damping module 4 on the top of the seismic isolation bearing layer 3.

[0062] The converted vertical additional pressure and the remaining seismic waves act on the seismic isolation bearing layer 3. The elastic support component 32 and the vertical damper 33 perform final buffering and isolation through compression deformation, protecting the building structure above the seismic isolation bearing layer 3.

[0063] According to the calculated first Segmented ring unit Uniform thickness Each ring unit 21 is manufactured individually, and each group of ring units 21 is spliced ​​together to obtain a stepped spliced ​​acoustic black hole module 2.

[0064] During an earthquake, seismic waves travel up the composite pile body 1. The stepped-joint acoustic black hole module 2, together with the outer pile shell 11 and the inner pile core 12, forms a waveguide channel. The waveguide channel guides the propagation and energy focusing of the seismic waves, i.e., elastic waves. The waveguide channel directionally guides the seismic waves traveling up the composite pile body 1 into the stepped-joint acoustic black hole module 2. The stepped-joint acoustic black hole module 2 utilizes the change in structure from thick to thin. The seismic waves flow from the thick end to the thin end of the stepped-joint acoustic black hole module 2, causing the thinnest ring unit 21 in the stepped-joint acoustic black hole module 2 to generate a high-amplitude local bending vibration greater than the overall structure. As the vibration propagates, the wave velocity gradually decreases and the amplitude gradually increases. The seismic waves are effectively accumulated in the elastic damping material at the thinnest part of the stepped-joint acoustic black hole module 2, causing the elastic damping material to undergo violent deformation. The elastic damping material further consumes the vibration through violent deformation.

[0065] After passing through the primary energy dissipation and attenuation stage of the stepped-joint acoustic black hole module 2, the seismic wave reaches the top of the composite pile body 1. The magnetic ball 44 rolls along the curved surface of the lower hemisphere shell 431, converting the horizontal motion into additional vertical pressure on the bottom of the lower hemisphere shell 431. During the motion, the magnetic ball 44 cuts the lower hemisphere shell 431, generating electromagnetic eddy current damping. The magnetic ball 44 cuts the magnetic field lines, and an eddy current induced magnetic field is generated in the lower hemisphere shell 431. According to Lenz's law, the eddy current induced magnetic field hinders the relative motion between the magnetic ball 44 and the original magnetic field, that is, eddy current damping is generated. At the same time, the induced eddy current closed loop in the lower hemisphere shell 431 converts the vibration energy of the seismic wave into heat energy dissipation through the resistance effect of the lower hemisphere shell 431.

[0066] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A spliced ​​acoustic black hole vibration damping pile, characterized in that, It includes a composite pile body (1), a stepped splicing acoustic black hole module (2), a seismic isolation bearing layer (3), and a magnetic ball eddy current damping module (4). The composite pile body (1) is vertically embedded in the foundation; The stepped splicing acoustic black hole module (2) is installed inside the composite pile body (1); The seismic isolation bearing layer (3) is installed on top of the composite pile body (1); The magnetic ball eddy current damping module (4) is installed on the upper part of the seismic isolation bearing layer (3), and the magnetic ball eddy current damping module (4) is used to support the upper building structure. The composite pile body (1) includes an outer pile shell (11) and an inner pile core (12) arranged coaxially. The outer pile shell (11) and the inner pile core (12) are both integrally cast from reinforced concrete. The stepped splicing acoustic black hole module (2) is embedded between the outer pile shell (11) and the inner pile core (12) as a pre-embedded part. The stepped splicing acoustic black hole module (2) is connected to the outer pile shell (11) and the inner pile core (12) on both sides respectively. The stepped splicing acoustic black hole module (2) is composed of several ring units (21) spliced ​​together. The thickness of the several ring units (21) decreases in a stepped manner from bottom to top. The surface of the ring unit (21) with the smallest thickness is coated with an elastic damping material. The magnetic ball eddy current damping module (4) includes a lower steel plate (41), which is installed on the top of the elastic support assembly (32) and the vertical damper (33). An upper steel plate (42) is provided above the lower steel plate (41). The surface of the lower steel plate (41) is provided with several sets of lower hemispherical grooves, and the surface of the upper steel plate (42) is provided with several sets of upper hemispherical grooves that match the lower hemispherical grooves. Each set of lower hemispherical grooves is provided with a set of lower hemispherical shells (431), and each set of upper hemispherical grooves is provided with a set of upper hemispherical shells (432) that cooperate with the lower hemispherical shells (431). The lower hemispherical shells (431) and the upper hemispherical shells (432) form a spherical cavity (43), and a magnetic ball (44) is provided in the spherical cavity (43).

2. The spliced ​​acoustic black hole vibration damping pile as described in claim 1, characterized in that, The seismic isolation bearing layer (3) includes a steel pad (31), an elastic support assembly (32), and a vertical damper (33). The steel pad (31) is embedded in the top of the composite pile body (1) as a pre-embedded part. The steel pad (31) is connected to both the outer pile shell (11) and the inner pile core (12). The elastic support assembly (32) is installed in the middle of the surface of the steel pad (31). The vertical damper (33) is installed at the center of the surface of the steel pad (31). The top of the vertical damper (33) is on the same plane as the top of the elastic support assembly (32).

3. The spliced ​​acoustic black hole vibration damping pile as described in claim 2, characterized in that, The elastic support assembly (32) includes several springs of the same specification, which are arranged in a ring at equal intervals on the surface of the steel pad (31).

4. The spliced ​​acoustic black hole vibration damping pile as described in claim 1, characterized in that, The upper hemispherical shell (432) and the lower hemispherical shell (431) are both made of a good conductor metal material, and the lower hemispherical shell (431) and the upper hemispherical shell (432) serve as carriers for eddy current generation.

5. A method of using a spliced ​​acoustic black hole vibration damping pile as described in any one of claims 1-4, characterized in that, Includes the following steps: Step S1: Determine the specifications and dimensions of the composite pile body (1), and determine the specifications and dimensions of the stepped splicing acoustic black hole module (2) based on the specifications and dimensions of the composite pile body (1). Step S2: Fabricate the stepped acoustic black hole module (2) according to the specifications and dimensions of the stepped splicing acoustic black hole module (2). In step S3, when making the composite pile body (1), the stepped splicing acoustic black hole module (2) is installed inside the composite pile body (1), the seismic isolation bearing layer (3) is installed on the top of the composite pile body (1), and the magnetic ball eddy current damping module (4) is installed on the top of the seismic isolation bearing layer (3).

6. The method of using a spliced ​​acoustic black hole vibration damping pile as described in claim 5, characterized in that, In step S2, the steps for determining the size of the stepped acoustic black hole module (2) are as follows: Establish a power-law formula for determining the specifications of an acoustic black hole ring: ； in, The thickness of the acoustic black hole ring under ideal conditions. This is the truncation value. It is a constant. The power exponent, L is the total effective arc length of the acoustic black hole ring along the energy propagation path. It is the arc length of the acoustic black hole ring extending from the thickest end to the thinnest end; In step S2, the power-law formula is discretized, and the acoustic black hole ring is divided into... Segment ring unit, the first Segmented ring unit ( Uniform thickness The calculation formula is: ； in, For the first The coordinates of the arc length of the center point of the spiral path of the ring element.

7. The method of using a spliced ​​acoustic black hole vibration damping pile as described in claim 6, characterized in that, According to the calculated first Segmented ring unit ( Uniform thickness Each ring unit (21) is made individually, and each group of ring units (21) is spliced ​​together to obtain a stepped spliced ​​acoustic black hole module (2).

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