Shock absorber and subway vibration isolation trench using same

Abstract

The invention discloses a shock absorber and a subway vibration isolation trench applying the shock absorber. The shock absorber comprises an extension spring, a mass block, a supporting frame and a damper, and the extension spring is connected to the bottom of a passing plate; the mass block is connected with the extension spring; one end of the actuator is connected with the passing plate, and the other end is connected with the mass block; the support frame is mounted in the vibration isolation trench; one end of the damper is hinged with the support frame, and the other end is hinged with the mass block. The actuator applies real-time controllable braking force, vibration can be dynamically and reversely counteracted, the effective frequency band can be expanded, vibration under non-design working conditions can be restrained, the extension spring provides passive elastic restoring force, the system inherent frequency is adjusted, the main structure vibration frequency is matched, the damper dissipates kinetic energy, transient response is restrained, and therefore the resonance peak value is reduced, and vibration attenuation is accelerated. Through cooperation of the actuator, the extension spring and the damper, deep fusion of passive frequency tuning and active dynamic compensation is realized, and a broad-spectrum self-adaptive vibration control system is formed.

Description

Technical Field

[0001] This application relates to the field of vibration damping technology, and in particular to a shock absorber and a subway vibration isolation trench using the shock absorber. Background Art

[0002] When constructing a building near a subway, it is often affected by the vibration generated when a subway vehicle passes by.

[0003] Therefore, it is generally chosen to dig an isolation trench between the subway and the building to be constructed, and reduce the vibration effect by blocking the vibration wave. However, when building some buildings such as optical laboratories, such vibration isolation effect is still insufficient to meet the requirements. Summary of the Invention

[0004] The purpose of this application is to provide a shock absorber and a subway vibration isolation trench using the shock absorber to improve the problem that the high-altitude construction of the tie beam is more troublesome and has a higher potential safety hazard.

[0005] A shock absorber and a subway vibration isolation trench using the shock absorber provided by this application adopt the following technical solutions: A shock absorber is installed on a passage plate on the isolation trench, and includes a tension spring connected to the bottom of the passage plate; a mass block connected to the end of the tension spring away from the passage plate; an actuator, one end of which is connected to the passage plate and the other end is connected to the mass block; a support frame installed in the isolation trench; and a plurality of dampers. The plurality of dampers are arranged on the outer side of the mass block along the circumferential direction of the mass block. One end of the damper is hinged to the support frame, and the other end is hinged to the mass block.

[0006] By adopting the above technical solutions, the actuator applies a real-time controllable braking force, which can dynamically counteract the vibration in the reverse direction, and can expand the effective frequency band to suppress the vibration under non-designed working conditions. The tension spring provides a passive elastic restoring force to adjust the natural frequency of the system and match the vibration frequency of the main structure. The damper can dissipate kinetic energy and suppress the transient response, thereby reducing the resonance peak value and accelerating the vibration attenuation. The cooperation of the actuator, the tension spring and the damper realizes the deep integration of passive frequency tuning and active dynamic compensation, forms a wide-spectrum adaptive vibration control system, is applicable to the vibration isolation requirements of high-precision equipment, large buildings and complex working conditions, and the comprehensive performance is greatly improved compared with the traditional passive system.

[0007] Optionally, a plurality of hanging seats are threadedly connected in the passage plate. The number of the hanging seats is equal to the total number of the tension springs and the actuators. Each hanging seat corresponds to one of the tension springs or the actuators. The top of the tension spring or the actuator passes through the hanging seat and is connected with a limiting block. A hanging ring is connected to the limiting block. A hoisting groove for accommodating the limiting block and the hanging ring is provided in the hanging seat.

[0008] Through the above technical solution, the suspension seat can provide a fulcrum for the tension spring and the actuator to apply a tensile force to the mass block; at the same time, the suspension seat is detachably connected to the access plate, facilitating the overall transfer of the shock absorber.

[0009] Optionally, a storage frame is provided on the support frame, and the storage frame is located below the mass block for storing the mass block.

[0010] Through the above technical solution, the storage frame is used to store the mass block, support the mass block through the storage frame, and then stably fix the mass block through a steel cable or the like. The shock absorber can be lifted as a whole by hoisting the support frame and is convenient for transfer and transportation. At the same time, this shock absorber can not only be applied to the vibration reduction of plate-like structures, but also be used for the vibration reduction of some tower-like buildings on the construction site, such as construction platforms, etc., making the shock absorber highly versatile.

[0011] Optionally, a vibration isolation support is detachably connected below the support frame, and the vibration isolation support is installed on the bottom surface of the vibration isolation trench.

[0012] Through the above technical solution, the vibration isolation support facilitates reducing the influence of vibration on the support frame.

[0013] A subway vibration isolation trench includes a vibration isolation trench, an access plate is installed on the vibration isolation trench, and the above shock absorber is installed at the bottom of the access plate.

[0014] Optionally, a fence is provided on one side of the vibration isolation trench away from the construction area.

[0015] Through the above technical solution, setting up a fence can further isolate the vibration and sound generated by the subway.

[0016] Optionally, an installation groove for installing the access plate is provided on the vibration isolation trench, and a vibration damping rubber pad is installed on the side wall of the installation groove.

[0017] By adopting the above technical solution, the vibration damping rubber pad can effectively reduce the vibration transmitted to the access plate.

[0018] Optionally, the top of the side wall of the vibration isolation trench is inclined outward, the included angle between the side wall of the vibration isolation trench and the bottom of the vibration isolation trench is 120 to 135 degrees, and a first cement mortar layer is provided on the side wall of the vibration isolation trench.

[0019] By adopting the above technical solution, the side wall of the vibration isolation trench is inclined. The inclined side wall can utilize the self-weight of the soil to form a wedge-shaped support effect. Compared with the vertical wall surface, the equivalent lateral pressure of the inclined side wall can be effectively reduced. At the same time, the inclined wall surface changes the concentrated transfer of shear stress under the vibration load into a gradual diffusion along the wall surface. Cooperating with the first cement mortar layer, it can effectively reduce the base reaction force. In addition, the inclined side wall can change the boundary conditions, causing the incident surface wave to undergo non-specular reflection on the inclined wall surface, effectively increasing the path difference of the wave and accelerating the energy dissipation. The inclined structure can also destroy the "wave guide" path formed by the vertical side wall and inhibit the propagation of low-frequency waves (f < 10 Hz) along the length direction of the trench, which is particularly suitable for the lateral vibration isolation of continuous vibration sources such as railways or highways.

[0020] Optionally, a base layer is further provided at the bottom of the vibration isolation trench. The base layer successively includes a second cement mortar layer, a rubble concrete layer, a concrete cushion layer, and a rammed earth layer from top to bottom. The ramming coefficient of the rammed earth layer is greater than 90%.

[0021] By the above technical solution, the rammed earth layer can increase the foundation bearing capacity, eliminate the voids in the backfill soil, improve the shear strength, and reduce the settlement after construction, avoiding the formation of weak foundation zones. The concrete cushion layer can disperse the dynamic load and prevent the base from cracking. The volume ratio of the rubble in the rubble concrete layer is 30% to 40%, which can achieve a wave impedance gradient transition and block the transmission of surface waves. The second cement mortar layer can adopt M20 mortar, which can improve the layer interlocking degree, optimize the friction coefficient, and realize the adjustment of secondary stress distribution. The cooperation of the second cement mortar layer, the rubble concrete layer, the concrete cushion layer, and the rammed earth layer realizes three times of energy scattering and dissipation of the vibration energy on the propagation path through the gradual increase of the foundation bearing capacity, the wave impedance gradient transition, and the optimized distribution of the interface stress, and can greatly reduce the vibration response compared with the single-layer vibration isolation structure.

[0022] Optionally, the access plate includes a steel base plate, a concrete layer, and a rubber damping layer. The concrete layer is arranged on the top surface of the steel base plate, and the rubber damping layer is arranged on the bottom surface of the steel base plate; V-shaped grooves are provided on the bottom surface of the steel base plate, and a plurality of V-shaped grooves are arrayed along the width direction of the vibration isolation trench to form a wavy shape; a plurality of elastic bodies are provided on the top surface of the steel base plate, and the elastic bodies are embedded in the concrete layer.

[0023] By adopting the above technical solutions, the V-groove can be better combined with the rubber damping layer. At the same time, the wavy structure formed by the V-groove can direct the wave energy to the insensitive areas on both sides of the plate by means of geometric scattering; the elastomer can be set on the steel substrate in advance by bonding or pouring processes. When pouring the concrete layer, the elastomer is covered by the concrete layer, and then the elastic wave bandgap formed between different materials can be utilized to block the transmission of vibration waves. Through the coupling effect of the steel-concrete-rubber ternary material system and the wavy geometry, a multi-level damping system combining rigidity and flexibility is constructed, which can significantly reduce the vibration response compared with the traditional flat structure.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. The actuator applies a real-time controllable braking force, which can dynamically counteract vibrations in the reverse direction, can expand the effective frequency band, suppress vibrations under non-designed conditions, and the tension spring provides a passive elastic restoring force to adjust the natural frequency of the system and match the vibration frequency of the main structure. The damper can dissipate kinetic energy and suppress transient responses, thereby reducing the resonance peak and accelerating the vibration decay. The cooperation of the actuator, the tension spring and the damper realizes the deep integration of passive frequency tuning and active dynamic compensation, forms a wide-spectrum adaptive vibration control system, is applicable to the vibration isolation requirements of high-precision equipment, large buildings and complex working conditions, and the comprehensive performance is greatly improved compared with the traditional passive system; 2. The storage frame is used to store the mass block. The mass block is supported by the storage frame, and then the mass block is stably fixed by steel cables or the like. Then, the whole shock absorber can be lifted by the hoisting support frame and is convenient for transfer and transportation. At the same time, this shock absorber can not only be applied to the vibration reduction of plate-like structures, but also be used for the vibration reduction of some tower-like buildings on the construction site, such as construction platforms, etc., so that the shock absorber has high versatility; 3. The side wall of the vibration isolation trench is inclined. The inclined side wall can utilize the self-weight of the soil to form a wedge-shaped support effect. Compared with the vertical wall surface, the equivalent lateral pressure of the inclined side wall can be effectively reduced. At the same time, the inclined wall surface makes the shear stress under the vibration load change from concentrated transmission to gradual diffusion along the wall surface. Cooperating with the first cement mortar layer, the base reaction force can be effectively reduced. In addition, the inclined side wall can change the boundary conditions, prompting the incident surface wave to undergo non-specular reflection on the inclined wall surface, effectively increasing the wave path difference and accelerating the energy dissipation. The inclined structure can also destroy the "wave guide" path formed by the vertical side wall and inhibit the propagation of low-frequency waves (f < 10 Hz) along the trench length direction, which is particularly suitable for the lateral vibration isolation of continuous vibration sources such as railways or highways; 4. The rammed plain soil layer can increase the foundation bearing capacity, eliminate the voids in the backfill soil, improve the shear strength, and reduce the settlement after construction, avoiding the formation of weak foundation zones. The concrete cushion layer can disperse dynamic loads and prevent the base course from cracking. The proportion of the volume of rubble in the rubble concrete layer is 30% to 40%, which can achieve a gradient transition of wave impedance and block the transmission of surface waves. The second cement mortar layer can use M20 mortar, which can improve the interfacial interlock, optimize the friction coefficient, and achieve the adjustment of secondary stress distribution. The combination of the second cement mortar layer, the rubble concrete layer, the concrete cushion layer, and the rammed plain soil layer realizes the three - time energy scattering dissipation of vibration energy on the propagation path through the gradual increase of foundation bearing capacity, the gradient transition of wave impedance, and the optimized distribution of interfacial stress. Compared with the single - layer vibration isolation structure, the vibration response can be significantly reduced; 5. The V - shaped groove can be better combined with the rubber damping layer. At the same time, the wavy structure formed by the V - shaped groove can use geometric scattering to direct the wave energy to the insensitive areas on both sides of the plate; the elastomer can be set on the steel substrate by prior bonding or pouring process. When pouring the concrete layer, the elastomer is covered by the concrete layer, and then the elastic wave bandgap formed between different materials can be used to block the transmission of vibration waves. Through the coupling effect of the steel - concrete - rubber ternary material system and the wavy geometry, a multi - level vibration damping system combining rigidity and flexibility is constructed, and the vibration response can be significantly reduced compared with the traditional flat structure. Description of the Drawings

[0025] Figure 1 It is a schematic diagram showing the overall shock absorber in the present invention.

[0026] Figure 2 It is a schematic diagram showing the suspension seat, suspension ring, and limit block in the present invention.

[0027] Figure 3 It is a three - dimensional schematic diagram showing the rotating tooling in the present invention.

[0028] Figure 4 It is a schematic diagram showing the internal structure of the vibration isolation support in the present invention.

[0029] Figure 5 It is a schematic diagram showing the arrangement of the conical surface direction of the vibration isolation support in the present invention.

[0030] Figure 6 It is a schematic diagram showing the vibration isolation trench in the present invention.

[0031] Figure 7 It is a schematic diagram showing the access plate in the present invention.

[0032] In the figure, 1 is a tension spring; 11 is a limit block; 12 is a lifting ring; 13 is a rotating tooling, 131 is a main ring, 132 is a plug rod, 133 is a leverage rod; 2 is an actuator; 3 is a mass block; 4 is a support frame, 41 is a storage frame, 42 is a vibration isolation support, 421 is a first steel plate layer, 422 is a first natural rubber layer, 423 is a second steel plate layer, 424 is a second natural rubber layer, 425 is a third steel plate layer, 426 is a lead core, 427 is a conical surface direction; 5 is a damper; 6 is a passage plate, 61 is a suspension seat, 611 is a mating hole; 7 is a vibration isolation trench, 71 is a first cement mortar layer, 72 is a second cement mortar layer, 73 is a rubble concrete layer, 74 is a concrete cushion layer, 75 is a rammed plain soil layer, 76 is a steel base plate, 761 is a V-shaped groove, 762 is an elastomer, 77 is a concrete layer, 78 is a rubber vibration damping layer, 79 is a rubber shock pad; 8 is a fence. Detailed implementation mode

[0033] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0034] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] Embodiment 1 In the first aspect, the present application discloses a shock absorber.

[0036] A shock absorber, referring to Figures 1 to 3, including a tension spring 1, an actuator 2, a mass block 3, a support frame 4, and a damper 5. The tension spring 1 is detachably connected to the bottom of the access plate 6, and the mass block 3 is hinged to the end of the tension spring 1 away from the access plate 6. One end of the actuator 2 is connected to the access plate 6, and the other end is connected to the mass block 3. The support frame 4 is installed in the vibration isolation trench 7. There are multiple dampers 5, and the multiple dampers 5 are arranged on the outer side of the mass block 3 along the circumferential direction of the mass block 3. One end of the damper 5 is hinged to the support frame 4, and the other end is hinged to the mass block 3. The actuator 2 applies a real-time controllable braking force, which can dynamically counteract vibrations in the reverse direction, and can expand the effective frequency band, suppressing vibrations under non-design conditions. The tension spring 1 provides a passive elastic restoring force to adjust the natural frequency of the system and match the vibration frequency of the main structure. The damper 5 can dissipate kinetic energy, suppressing the self-oscillation of the mass block 3 and avoiding secondary resonance, thereby reducing the resonance peak and accelerating the vibration attenuation. The cooperation of the actuator 2, the tension spring 1, and the damper 5 realizes the deep integration of passive frequency tuning and active dynamic compensation, forming a wide-spectrum adaptive vibration control system, which is suitable for the vibration isolation requirements of high-precision equipment, large buildings, and complex working conditions, and the comprehensive performance is greatly improved compared with traditional passive systems.

[0037] A vibration sensor is respectively arranged on the mass block 3 and the access plate 6, and both vibration sensors are electrically connected to the controller, and the controller is electrically connected to the actuator 2, so as to transmit the vibration information of the mass block 3 and the access plate 6 to the actuator 2, and further facilitate the analysis of the phase difference of the vibrations between the mass block 3 and the access plate 6, facilitating the actuator 2 to apply a more accurate braking force and further improving the vibration reduction effect.

[0038] In addition, a laser vibrometer is arranged on the side of the vibration isolation trench 7 close to the vibration source to monitor the vibration mode of the boundary of the vibration isolation trench 7. The laser vibrometer is electrically connected to the controller, and at the same time the controller is also electrically connected to the damper 5, so as to adjust the damping of the damper 5 in real time according to the vibration information of the vibration isolation trench 7, the mass block 3, and the access plate 6, combined with the braking force output by the actuator 2, and further better realize vibration reduction.

[0039] Specifically, a plurality of hanging seats 61 are connected to the access plate 6 by internal threads. The number of the hanging seats 61 is equal to the total number of the tension springs 1 and the actuators 2. Each hanging seat 61 corresponds to a tension spring 1 or an actuator 2. The top of the tension spring 1 or the actuator 2 passes through the hanging seat 61 and is connected with a limiting block 11. A hanging ring 12 is fixedly connected to the limiting block 11. A hoisting groove for accommodating the limiting block 11 and the hanging ring 12 is arranged in the hanging seat 61. The hanging seat 61 can provide a fulcrum for the tension spring 1 and the actuator 2 to apply a pulling force to the mass block 3. The position of the hanging seat 61 and the actuator 2 is relatively fixed, but the hanging seat 61 can rotate relative to the actuator 2 so that the hanging seat 61 can be screwed onto the access plate 6. A plurality of matching holes 611 are formed in the top surface of the hanging seat 61 for matching with the rotating tooling 13. The rotating tooling 13 includes a main ring 131, a plug rod 132 and a leverage rod 133. The number of the plug rods 132 is equal to the number of the matching holes 611 on each hanging seat 61 and is used for inserting into the corresponding matching holes 611, and the plug rod 132 is in interference fit with the matching holes 611. The plug rod 132 and the leverage rod 133 are both fixedly connected to the main rod. When the hanging seat 61 needs to be disassembled or installed, the plug rod 132 is inserted into the corresponding matching hole 611, and then the main ring 131 is pushed to rotate through the leverage rod 133, thereby driving the hanging seat 61 to rotate, so that the hanging seat 61 is screwed to or disconnected from the access plate 6. An avoidance notch is arranged on the main ring 131 for passing through the lifting rope.

[0040] A storage frame 41 is arranged on the support frame 4. The storage frame 41 is located below the mass block 3 for storing the mass block 3. When the mass block 3 needs to be stored, a hoisting device is used to hang the hanging rings 12 of the actuator 2 and the tension spring 1, and then the hanging seat 61 is removed by the rotating tooling 13. Then the hoisting device hoists the mass block 3 below. At the same time, the damper 5 reduces the resistance until the mass block 3 falls onto the storage frame 41. At this time, the damper 5 applies a large resistance to assist in limiting the mass block 3. Both ends of the damper 5 are ball-jointed with the support frame 4 and the mass block 3, and the position where the damper 5 is hinged to the mass block 3 is close to the middle position of the mass block 3 in the vertical direction. The mass block 3 can be spherical or square. In this embodiment, the spherical shape is taken as an example.

[0041] By supporting the mass block 3 through the storage frame 41 and then stably fixing the mass block 3 by steel cables or the like, the shock absorber as a whole can be hoisted by hoisting the support frame 4 and is convenient for transfer and transportation. At the same time, such a shock absorber can not only be applied to the shock absorption of plate-like structures, but also be used for the shock absorption of some tower-like buildings on the construction site, such as construction platforms. Only the actuator 2 needs to be removed during installation. The actuator 2 can also be retained, but no braking force is actively applied.

[0042] A vibration isolation support 42 is detachably connected below the support frame 4. The vibration isolation support 42 and the support frame 4 can be fixedly connected by bolts. The vibration isolation support 42 is installed on the bottom surface of the vibration isolation trench 7, which is convenient for reducing the influence of vibration on the support frame 4. In this embodiment, there are four vibration isolation supports 42.

[0043] Specifically, referring to Figure 4 , an installation groove is provided in the vibration isolation support 42. A first steel plate layer 421, a first natural rubber layer 422, a second steel plate layer 423, a second natural rubber layer 424, and a third steel plate layer 425 are sequentially installed in the installation groove from bottom to top. The centers of the first steel plate layer 421, the first natural rubber layer 422, the second steel plate layer 423, the second natural rubber layer 424, and the third steel plate layer 425 are penetrated by the same lead core 426. The lead core 426 has a high damping energy dissipation effect, which can further enhance vibration isolation. The first steel plate layer 421 and the first natural rubber layer 422, the first natural rubber layer 422 and the second steel plate layer 423, and the second steel plate layer 423 and the second natural rubber layer 424 are all in conical surface fit. The conical surface includes two mutually inclined and braced planes, and the pressure and vibration are diffused to both sides through the conical surface. In addition, referring to Figure 5 , the conical surface directions 427 of adjacent vibration isolation supports 42 are perpendicular to each other to improve the stability of the entire vibration isolation system.

[0044] Second, the present application discloses a subway vibration isolation trench.

[0045] A subway vibration isolation trench, referring to Figure 6 and Figure 7 , includes a vibration isolation trench 7. A passage plate 6 is installed on the vibration isolation trench 7, and the above-mentioned shock absorber is installed at the bottom of the passage plate 6.

[0046] In order to further isolate the vibration and sound generated by the subway, a fence 8 is built on one side of the vibration isolation trench 7 away from the construction area, and the height of the fence 8 can be 1.5 to 2.5 meters.

[0047] In addition, an installation groove for installing the passage plate 6 is reserved on the vibration isolation trench 7, and a vibration isolation rubber pad is installed on the side wall of the installation groove to reduce the vibration transmitted to the passage plate 6.

[0048] The top of the side wall of the vibration isolation trench 7 is inclined outward. The angle between the side wall of the vibration isolation trench 7 and the bottom of the vibration isolation trench 7 is 120 to 135 degrees. A first cement mortar layer 71 is plastered on the side wall of the vibration isolation trench 7. The side wall of the vibration isolation trench 7 is inclined. The inclined side wall can utilize the self-weight of the soil to form a wedge support effect. Compared with the vertical wall surface, the equivalent lateral pressure of the inclined side wall can be effectively reduced. At the same time, the inclined wall surface makes the shear stress under the vibration load change from concentrated transmission to gradual diffusion along the wall surface. Cooperating with the first cement mortar layer 71, it can effectively reduce the base reaction force. In addition, the inclined side wall can change the boundary conditions, causing the incident surface wave to undergo non-specular reflection on the inclined wall surface, effectively increasing the path difference of the wave and accelerating the energy dissipation. The inclined structure can also destroy the "wave guide" path formed by the vertical side wall and inhibit the propagation of low-frequency waves (f < 10 Hz) along the trench length direction, which is especially suitable for the lateral vibration isolation of continuous vibration sources such as railways or highways.

[0049] A base layer is also provided at the bottom of the vibration isolation trench 7. The base layer successively includes a second cement mortar layer 72, a rubble concrete layer 73, a concrete cushion layer 74, and a rammed earth layer 75 from top to bottom. The ramming coefficient of the rammed earth layer 75 is greater than 90%. The rammed earth layer 75 can increase the foundation bearing capacity, eliminate the voids in the backfill soil, improve the shear strength, and reduce the settlement after construction to avoid the formation of a weak foundation zone. The concrete cushion layer 74 can disperse the dynamic load and prevent the base from cracking. The proportion of the volume of rubble in the rubble concrete layer 73 is 30% to 40%, which can achieve a wave impedance gradient transition and block the transmission of surface waves. The second cement mortar layer 72 can use M20 mortar, which can improve the interlayer fitting degree, optimize the friction coefficient, and realize the adjustment of the secondary stress distribution. The cooperation of the second cement mortar layer 72, the rubble concrete layer 73, the concrete cushion layer 74, and the rammed earth layer 75 realizes three energy scattering dissipations of the vibration energy on the propagation path through the gradual increase of the foundation bearing capacity, the wave impedance gradient transition, and the optimized distribution of the interface stress. Compared with the single-layer vibration isolation structure, the vibration response can be significantly reduced.

[0050] Specifically, the passing plate 6 includes a steel substrate 76, a concrete layer 77 and a rubber damping layer 78. The concrete layer 77 is disposed on the top surface of the steel substrate 76, and the rubber damping layer 78 is disposed on the bottom surface of the steel substrate 76. V-shaped grooves 761 are provided on the bottom surface of the steel substrate 76. A plurality of V-shaped grooves 761 are arranged in an array along the width direction of the vibration isolation trench 7 to form a wavy shape, so as to better combine with the rubber damping layer 78. At the same time, the wavy structure formed by the V-shaped grooves 761 can use geometric scattering to direct the wave energy to the insensitive areas on both sides of the plate. A plurality of elastic bodies 762 are provided on the top surface of the steel substrate 76, and the elastic bodies 762 are embedded in the concrete layer 77. The elastic body 762 can be butyl rubber. The elastic body 762 can be set on the steel substrate 76 by prior bonding or pouring process. When pouring the concrete layer 77, the elastic body 762 is covered by the concrete layer 77, so as to be able to use the elastic wave band gap formed between different materials to prevent the transmission of vibration waves. Through the coupling effect of the steel-concrete-rubber ternary material system and the wavy geometry, a multi-level damping system combining rigidity and flexibility is constructed, and the vibration response can be greatly reduced compared with the traditional flat plate structure.

[0051] The embodiments of the specific implementation manners are all preferred embodiments of the present application, and do not limit the protection scope of the present application accordingly. The same components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A vibration absorber, mounted on a passage plate (6) on a vibration isolation groove (7), characterized in that: include A tension spring (1) connected to the bottom of the pass plate (6); A mass block (3) connected to an end of the tension spring (1) away from the passage plate (6); An actuator (2), one end of which is connected to the pass plate (6), and the other end of which is connected to the mass block (3); A support frame (4) is installed in the vibration isolation groove (7); A plurality of dampers (5) are provided, wherein the plurality of dampers (5) are arranged on the outside of the mass block (3) along the circumference of the mass block (3), and one end of the damper (5) is hinged to the support frame (4), and the other end is hinged to the mass block (3).

2. A vibration absorber according to claim 1, characterized in that: The pass plate (6) is internally threadedly connected to a plurality of hangers (61), the number of the hangers (61) being equal to the total number of the tension springs (1) and the actuators (2), each hanger (61) corresponding to one tension spring (1) or one actuator (2), the top of the tension spring (1) or the actuator (2) passing through the hanger (61) and connected to a limit block (11), the limit block (11) being connected to a lifting ring (12), and a lifting groove for accommodating the limit block (11) and the lifting ring (12) being provided in the hanger (61).

3. A vibration absorber according to claim 2, characterized in that: The support frame (4) is provided with a storage frame (41), and the storage frame (41) is located below the mass block (3) and is used to store the mass block (3).

4. A vibration absorber according to claim 2, characterized in that: A vibration isolation support (42) is detachably connected to the bottom of the support frame (4), and the vibration isolation support (42) is installed on the bottom surface of the vibration isolation groove (7).

5. A subway vibration isolation trench, characterized in that: It comprises a vibration isolation groove (7), a passage plate (6) is installed on the vibration isolation groove (7), and the bottom of the passage plate (6) is installed with the vibration absorber according to any one of claims 1 to 4.

6. A subway vibration isolation trench according to claim 5, characterized in that: A fence (8) is provided on the side of the vibration isolation trench (7) away from the construction area.

7. A subway vibration isolation trench according to claim 6, characterized in that: The vibration isolation groove (7) is provided with a mounting groove for mounting the passage plate (6), and a vibration-damping rubber pad is mounted on the side wall of the mounting groove.

8. The subway vibration isolation trench according to claim 7, characterized in that: The top of the side wall of the vibration isolation groove (7) is arranged to be inclined outward, the angle between the side wall of the vibration isolation groove (7) and the bottom of the vibration isolation groove (7) is 120 to 135 degrees, and a first cement mortar layer (71) is provided on the side wall of the vibration isolation groove (7).

9. A subway vibration isolation trench according to claim 8, characterized in that: A foundation layer is also provided at the bottom of the vibration isolation trench (7), and the foundation layer comprises, from top to bottom, a second cement mortar layer (72), a rough stone concrete layer (73), a concrete cushion layer (74), and a plain soil ramming layer (75), wherein the ramming coefficient of the plain soil ramming layer (75) is greater than 90 percent.

10. The subway vibration isolation trench according to claim 8, characterized in that: The passage plate (6) comprises a steel base plate (76), a concrete layer (77) and a rubber vibration-damping layer (78), wherein the concrete layer (77) is arranged on the top surface of the steel base plate (76), and the rubber vibration-damping layer (78) is arranged on the bottom surface of the steel base plate (76); A V-shaped groove (761) is provided on the bottom surface of the steel base plate (76), and a plurality of the V-shaped grooves (761) are arranged in an array along the width direction of the vibration isolation groove (7) to form a wave shape; A plurality of elastic bodies (762) are provided on the top surface of the steel base plate (76), and the elastic bodies (762) are pre-buried in the concrete layer (77).

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