Vibration reduction device and vibration reduction system for near subway building floor slab

Abstract

The invention discloses a vibration reduction device and a vibration reduction system for a near subway building floor, the vibration reduction device comprises a shell and a damping assembly, the shell is mounted at the bottom of the floor, a first cavity is formed in the shell, the first cavity is filled with damping fluid, the damping assembly is mounted below the shell, and the damping fluid is filled with the damping fluid. The damping assembly comprises a sliding rod, a damping plate, a mass block and a spiral spring, the sliding rod penetrates through a bottom plate of the first cavity in the vertical direction, the sliding rod is connected with the damping plate and the mass block, the spiral spring is arranged between the damping plate and the bottom plate of the first cavity, an electromagnet is arranged in the spiral spring, and the electromagnet and the spiral spring form a current loop; the electromagnet can apply electromagnetic resistance to the spiral spring through a magnetic field. Through the resonance effect, floor vibration is converted into mass block vibration, vibration energy is consumed under the cooperation effect of the damping liquid and the spiral spring, vibration reduction is achieved, the electromagnet applies electromagnetic resistance to the spiral spring through a magnetic field so as to better adapt to different vibration frequencies, and the vibration reduction effect is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of subway vibration reduction systems, and in particular to a vibration reduction device and a vibration reduction system for a floor slab of a building near a subway. Background Art

[0002] The construction of urban subway networks in China is in full swing. However, the vibration caused by subway operation reduces the comfort of the overlying buildings and restricts the use of building functions, which is the main obstacle in the development of the space above the subway. Therefore, it is urgent to study the means of vibration suppression and practical vibration reduction technologies for overlying buildings of the subway. Summary of the Invention

[0003] The purpose of the present invention is to provide a vibration reduction device for a floor slab of a building near a subway to improve the vibration problem caused by the passing of subway trains.

[0004] A vibration reduction device for a floor slab of a building near a subway provided by the present invention includes a housing and a damping assembly. The housing is installed at the bottom of the floor slab. A first cavity is provided in the housing, and the first cavity is filled with damping liquid. The damping assembly is installed below the housing. The damping assembly includes a sliding rod, a damping plate, a mass block, a spiral spring, and an electromagnet. The sliding rod passes through the bottom plate of the first cavity in the vertical direction. The top of the sliding rod extends into the first cavity and is connected to the damping plate. The bottom of the sliding rod extends out of the housing and is connected to the mass block. The spiral spring is arranged between the damping plate and the bottom plate of the first cavity. An electromagnet is provided in the spiral spring. The electromagnet is connected to the damping plate. The electromagnet and the spiral spring form an electric current loop, and the electromagnet can apply an electromagnetic resistance to the spiral spring through a magnetic field.

[0005] By adopting the above technical solutions, through the resonance effect, the floor slab vibration is converted into the mass block vibration, and then the vibration energy is consumed under the combined action of the damping liquid and the spiral spring to achieve vibration reduction. At the same time, the electromagnet applies an electromagnetic damping force to the spiral spring through a magnetic field, so as to better adapt to different vibration frequencies and further improve the vibration reduction effect.

[0006] Optionally, a sliding hole for the sliding rod to pass through is provided on the bottom plate of the first cavity, and a seal is installed in the sliding hole. The sliding plate passes through the seal.

[0007] By the above technical solutions, the seal seals between the sliding rod and the housing to reduce the possibility of damping liquid leakage.

[0008] Optionally, the seal includes a sealing sleeve, a sealing ring, and a positioning ring. The sealing sleeve is fixedly connected to the side wall of the sliding hole. Both the sealing ring and the positioning ring are fixedly connected inside the sealing sleeve. The sliding rod passes through both the sealing ring and the positioning ring simultaneously. There are two sealing rings, and the two sealing rings are arranged on both sides of the positioning ring along the axial direction of the sealing sleeve.

[0009] Through the above technical solution, the sliding rod is positioned by the positioning ring, improving the positioning accuracy of the sliding rod, reducing the possibility of excessive local extrusion force on the sealing ring caused by the vibration of the sliding rod, thereby ensuring the sealing effect and extending the service life of the sealing ring.

[0010] Optionally, steel balls are provided inside the positioning ring, and a part of the steel balls extends out of the positioning ring and contacts the side wall of the sliding rod.

[0011] Through the above technical solution, the friction between the steel balls and the sliding rod is reduced, thereby reducing the impact on the vibration damping effect.

[0012] Optionally, a baffle is fixedly connected to the top surface of the top plate of the housing. The baffle extends along the circumferential direction of the housing and forms a closed cross-section. A second cavity is formed inside the baffle. The top of the second cavity is open. Embedded steel bars are provided at the bottom of the floor slab and inserted into the second cavity. A first grouting port is provided on the side wall of the baffle.

[0013] Through the above technical solution, concrete is injected into the second cavity. By the combination of the concrete and the embedded steel bars, the housing and the floor slab are integrated, improving the tightness of the connection between the housing and the floor slab. At the same time, it is convenient to fully transfer the vibration of the floor slab to the damping component.

[0014] Optionally, a connecting pipe is fixedly connected to the top surface of the bottom plate of the second cavity. The connecting pipe is arranged in the vertical direction. A connecting steel sleeve is embedded in the floor slab. A connecting groove for inserting the connecting pipe is provided inside the connecting steel sleeve. A grouting groove is opened in the connecting pipe in the vertical direction. A second grouting port is provided on the side wall of the connecting pipe. One end of the second grouting port communicates with the second cavity, and the other end communicates with the grouting groove.

[0015] By adopting the above technical solution, through the cooperation of the connecting pipe and the connecting steel sleeve, the strength and tightness of the connection between the housing and the floor slab are further improved, thereby strengthening the transfer of vibration.

[0016] Optionally, a mating hole is opened on the side wall of the connecting pipe. A plug is slidably arranged in the mating hole. An annular groove for inserting the plug is opened on the side wall of the connecting groove. When grouting in the grouting groove, the plug moves towards the annular groove under the push of the concrete, and a part of the plug is inserted into the annular groove.

[0017] By adopting the above technical solution, the pressure of the concrete during grouting is used to push the bolt to move, so that the bolt can be inserted into the annular groove to prevent the connecting pipe and the connecting steel sleeve from moving in the vertical direction.

[0018] Optionally, a mixing groove is axially formed on the side wall of the connecting pipe along the axial direction of the connecting pipe, and a grouting gap is left between the top of the connecting pipe and the connecting groove.

[0019] Through the above technical solution, after the concrete flows out from the top of the grouting groove, it enters the grouting gap and then flows into each annular groove along the mixing groove, realizing full filling and further increasing the connection strength between the connecting pipe and the connecting steel sleeve.

[0020] In addition, the present invention also provides a vibration damping system for a near-subway building floor having the vibration damping device.

[0021] A vibration damping system includes the above vibration damping device, and further includes an acceleration sensor. The acceleration sensor is arranged in a subway tunnel near the building floor. The electromagnet is connected through a controller, and the acceleration sensor is electrically connected to the controller to transmit an electrical signal to the controller and control the current supplied to the electromagnet output by the controller.

[0022] By adopting the above technical solution, the speed of the subway is detected by the acceleration sensor. The greater the speed of the subway, the greater the vibration. At this time, the current supplied to the electromagnet is increased, so that the helical spring contracts, increasing the damping, and then absorbing greater vibration. Through this self-adjusting method, the accuracy of vibration damping is improved, and the vibration damping effect is further improved.

[0023] Optionally, the housing is set to be in a cuboid shape or a cylinder shape. When the housing is set to have a rectangular bottom surface, the damping components are arranged on two diagonals on the horizontal plane of the bottom plate, respectively located at the one-half, one-fourth, and one-sixth positions on the two diagonals;

[0024] When the housing is set to have a circular bottom surface, the damping components are arranged on two mutually perpendicular diameter lines on the horizontal plane of the bottom plate, respectively located at the one-half, one-fourth, and one-sixth positions on the two diameter lines.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects:

[0026] 1. Through the resonance effect, the floor vibration is converted into the vibration of the mass block, and then the vibration energy is consumed under the combined action of the damping liquid and the helical spring to realize vibration damping. At the same time, the electromagnet applies an electromagnetic damping force to the helical spring through the magnetic field, so as to better adapt to different vibration frequencies and further improve the vibration damping effect;

[0027] 2. The seal between the sliding rod and the housing is carried out through the seal to reduce the possibility of damping liquid leakage;

[0028] 3. Position the sliding rod through the positioning ring to improve the positioning accuracy of the sliding rod, reduce the possibility of excessive local extrusion force on the sealing ring caused by the vibration of the sliding rod, thereby ensuring the sealing effect and prolonging the service life of the sealing ring. Reduce the friction between the steel ball and the sliding rod, thereby reducing the impact on the vibration damping effect;

[0029] 4. Inject concrete into the second cavity. Through the combination of the concrete and the embedded steel bars, the housing and the floor slab are integrated, improving the tightness of the connection between the housing and the floor slab, and at the same time facilitating the full transfer of the floor slab vibration to the damping component;

[0030] 5. Through the cooperation of the connecting pipe and the connecting steel sleeve, further improve the connection strength and tightness between the housing and the floor slab, thereby strengthening the transfer of vibration;

[0031] 6. Push the bolt to move through the pressure of the concrete during grouting, so that the bolt can be inserted into the annular groove to prevent the connecting pipe and the connecting steel sleeve from moving in the vertical direction;

[0032] 7. After the concrete flows out from the top of the grouting groove, it enters the grouting gap, and then flows into each annular groove along the mixing groove to achieve full filling, further increasing the connection strength between the connecting pipe and the connecting steel sleeve;

[0033] 8. As the subway train approaches, the vibration brought by the subway train to the building is getting larger and larger. When the train moves away from the building, the vibration brought to the building will get smaller and smaller. Detect the vibration brought by the train through the acceleration sensor. When the vibration is getting larger, gradually increase the current output to the electromagnet at the same time, so that the helical spring gradually contracts, increasing the damping step by step, thereby absorbing greater vibration; on the contrary, when the vibration is getting smaller, gradually reduce the current output to the electromagnet, so that the helical spring gradually relaxes. Through this self-adjusting method, improve the accuracy of vibration damping and further improve the vibration damping effect. Brief Description of the Drawings

[0034] Figure 1 is a schematic cross-sectional view showing the overall vibration damping device for the floor slab of a building near a subway in the present invention.

[0035] Figure 2 is a schematic structural view showing the distribution of the mass block on the bottom plate of the housing in the present invention.

[0036] Figure 3 is Figure 1 a partial enlarged view of part A in

[0037] Figure 4 is a schematic structural view showing the connecting pipe in the present invention.

[0038] Figure 5It is a schematic cross-sectional structure diagram showing the connection pipe and the connecting steel sleeve in the present invention.

[0039] Figure 6 It is a schematic diagram showing the installation position distribution of the damping component on the bottom surface of the housing in the present invention.

[0040] In the figure, 1 is the housing; 11 is the first cavity; 12 is the baffle; 13 is the second cavity; 14 is the connecting pipe; 141 is the grouting groove; 142 is the second grouting port; 143 is the mating hole; 144 is the pin; 145 is the mixing tank; 2 is the damping component; 21 is the sliding rod; 22 is the damping plate; 23 is the mass block; 24 is the helical spring; 25 is the electromagnet; 26 is the seal; 261 is the sealing sleeve; 262 is the sealing ring; 263 is the positioning ring; 2631 is the steel ball; 3 is the embedded steel bar; 4 is the connecting steel sleeve; 41 is the connecting groove; 42 is the annular groove; 43 is the grouting gap. Detailed implementation manners

[0041] Now, the present invention will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0042] 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 specified, 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 "coupling" 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 communication inside 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.

[0043] Embodiment 1

[0044] Refer to Figures 1 to 5, the present invention discloses a vibration damping device for a floor slab of a building near a subway, which includes a housing 1 and a damping component 2. The housing 1 is installed at the bottom of the floor slab. The housing 1 is a sealed box. A first cavity 11 is provided inside the housing 1, and the first cavity 11 is filled with a damping liquid, which can be a non-Newtonian fluid. At the same time, a damping component 2 is installed below the housing 1. The damping component 2 includes a sliding rod 21, a damping plate 22, a mass block 23, and a helical spring 24. The sliding rod 21 passes through the bottom plate of the first cavity 11 in the vertical direction. The top of the sliding rod 21 extends into the first cavity 11 and is connected to the damping plate 22. The bottom of the sliding rod 21 extends out of the housing 1 and is connected to the mass block 23. The helical spring 24 is arranged between the damping plate 22 and the bottom plate of the first cavity 11. An electromagnet 25 is provided inside the helical spring 24. The electromagnet 25 is connected to the damping plate 22, and the electromagnet 25 and the helical spring 24 form a current loop. The electromagnet 25 can apply an electromagnetic resistance to the helical spring 24 through the magnetic field. In this embodiment, the helical spring 24 can be a compression spring. Through the resonance effect, the vibration of the floor slab is converted into the vibration of the mass block 23, and then the vibration energy is consumed under the combined action of the damping liquid and the helical spring 24 to achieve vibration damping. At the same time, the electromagnet 25 applies an electromagnetic damping force to the helical spring 24 through the magnetic field, so as to better adapt to different vibration frequencies and further improve the vibration damping effect.

[0045] Specifically, a sliding hole for the sliding rod 21 to pass through is provided on the bottom plate of the first cavity 11, and a seal 26 is installed in the sliding hole. The sliding plate passes through the seal 26. The seal 26 seals between the sliding rod 21 and the housing 1 to reduce the possibility of damping liquid leakage.

[0046] More specifically, the seal 26 includes a seal sleeve 261, a sealing ring 262, and a positioning ring 263. The seal sleeve 261 is fixedly connected to the side wall of the sliding hole. The sealing ring 262 and the positioning ring 263 are both fixedly connected inside the seal sleeve 261. The sliding rod 21 passes through both the sealing ring 262 and the positioning ring 263 at the same time. There are two sealing rings 262, and the two sealing rings 262 are arranged on both sides of the positioning ring 263 along the axial direction of the seal sleeve 261. The positioning ring 263 positions the sliding rod 21 to improve the positioning accuracy of the sliding rod 21 and reduce the possibility of excessive local extrusion force on the sealing ring 262 caused by the vibration of the sliding rod 21, thereby ensuring the sealing effect and prolonging the service life of the sealing ring 262. At the same time, the two sealing rings 262 can further ensure the sealing effect. In addition, to further ensure the prevention of leakage problems, a water-absorbing member can be installed below the lower sealing ring 262 to absorb the leaked damping liquid, and the staff regularly checks the water-absorbing member. If liquid is found in the water-absorbing member, the seal 26 is replaced in time.

[0047] It should be noted that steel balls 2631 are provided inside the positioning ring 263. Part of the steel balls 2631 extends outside the positioning ring 263 and contacts the side wall of the sliding rod 21. The steel balls 2631 reduce the frictional force between the sliding rod 21, thereby reducing the impact on the damping effect.

[0048] A baffle 12 is fixedly connected to the top surface of the top plate of the housing 1. The baffle 12 extends along the circumferential direction of the housing 1 and forms a closed cross-section. A second cavity 13 is provided inside the baffle 12. The top of the second cavity 13 is open. Embedded steel bars 3 inserted into the second cavity 13 are provided at the bottom of the floor slab. A first grouting port (not shown in the figure) is provided on the side wall of the baffle 12 for injecting concrete into the second cavity 13. By injecting concrete into the second cavity 13 and through the combination of the concrete and the embedded steel bars 3, the housing 1 and the floor slab are integrated, improving the tightness of the connection between the housing 1 and the floor slab, and at the same time facilitating the full transfer of the floor slab vibration to the damping assembly 2.

[0049] Furthermore, a connecting pipe 14 is fixedly connected to the top surface of the bottom plate of the second cavity 13. The connecting pipe 14 is arranged in the vertical direction. A connecting steel sleeve 4 is embedded in the floor slab. A connecting groove 41 for inserting the connecting pipe 14 is provided inside the connecting steel sleeve 4. A grouting groove 141 is opened in the connecting pipe 14 in the vertical direction. A second grouting port 142 is provided on the side wall of the connecting pipe 14. One end of the second grouting port 142 communicates with the second cavity 13, and the other end communicates with the grouting groove 141, facilitating the concrete in the second cavity 13 to enter the grouting groove 141 from the second grouting port 142. Through the cooperation of the connecting pipe 14 and the connecting steel sleeve 4, the strength and tightness of the connection between the housing 1 and the floor slab are further improved, and thus the transfer of vibration is strengthened.

[0050] More specifically, a mating hole 143 is further provided on the side wall of the connecting pipe 14. A plug 144 slides in the mating hole 143. An annular groove 42 for inserting the plug 144 is provided on the side wall of the connecting groove 41. Each annular groove 42 is opened in a circle on the side wall of the connecting groove 41 and is annularly distributed on the side wall of the connecting groove 41. When grouting in the grouting groove 141, the plug 144 moves towards the annular groove 42 under the push of the concrete, and a part of the plug 144 is inserted into the annular groove 42. By the pressure of the concrete during grouting to push the plug 144 to move, the plug 144 can be inserted into the annular groove 42 to prevent the connecting pipe 14 and the connecting steel sleeve 4 from moving relative to each other in the vertical direction.

[0051] In addition, a mixing groove 145 is axially formed in the side wall of the connecting pipe 14 along the axial direction of the connecting pipe 14, and a grouting gap 43 is left between the top of the connecting pipe 14 and the top of the connecting groove 41. After the concrete flows out from the top of the grouting groove 141, it enters the grouting gap 43, then enters the mixing groove 145, and then flows into each annular groove 42 along the mixing groove 145. In this way, sufficient filling is achieved, and the connection strength between the connecting pipe 14 and the connecting steel sleeve 4 is further increased. A rubber strip can be installed on the top of the baffle 12 to improve the sealing performance and ensure that the concrete can flow into the annular groove 42.

[0052] In a second aspect, the present invention provides a vibration damping system having the vibration damping device.

[0053] A vibration damping system includes the above-mentioned vibration damping device for the floor slab of a building adjacent to a subway, and further includes an acceleration sensor. The acceleration sensor is arranged in the floor slab to be vibration-damped, and is used to monitor the vibration response of the floor slab in real time. The electromagnet 25 is connected through a controller, and the acceleration sensor is electrically connected to the controller to transmit an electrical signal to the controller, and the controller controls the energizing current output to the electromagnet 25.

[0054] As the subway approaches, the vibration brought by the subway to the floor slab becomes larger and larger. When the subway moves away from the building, the vibration brought by the subway to the floor slab will become smaller and smaller. By using the acceleration sensor to monitor the vibration of the floor slab caused by the subway in real time, when the vibration becomes larger and larger, the current output to the electromagnet 25 is gradually increased at the same time, and the magnetic field intensity of the electromagnet is gradually enhanced. At this time, according to Lenz's law, when the helical spring 24 undergoes axial vibration, it will be subjected to gradually enhanced electromagnetic damping, which can accelerate the absorption and consumption of the subway vibration energy and reduce the floor slab vibration. On the contrary, when the vibration becomes smaller and smaller, the current output to the electromagnet 25 is gradually decreased. At this time, the magnetic field intensity of the electromagnet is reduced, and the electromagnetic damping received by the helical spring 24 is reduced, and the absorption and consumption efficiency of the subway vibration energy is reduced. The acceleration sensor and the controller continuously work together to dynamically adjust the energizing current output to the electromagnet 25 according to the real-time vibration intensity of the floor slab, so as to actively control the vibration response of the floor slab.

[0055] In addition, with reference to Figure 6 , the housing 1 is defined as a cuboid shape, and the two diagonals of the bottom plate of the housing 1 on the horizontal plane are defined as a and b. According to the position of the third-order mode, the damping component 2 is arranged at the one-half, one-fourth, and one-sixth positions of a or b to ensure the vibration damping effect. At the same time, the first-order mode is 16 Hz and the second-order mode is 25 Hz.

[0056] In another embodiment, the housing 1 can be in a cylindrical shape. At this time, two mutually perpendicular diameter lines are selected as a and b.

[0057] The embodiments of the specific implementation manners are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention 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 invention shall be covered within the protection scope of the present invention.

Claims

1. A vibration damping device for the floor slab of a building near a subway, characterized in that, It includes a housing (1) and a damping component (2). The housing (1) is installed at the bottom of the floor slab. A first cavity (11) is provided inside the housing (1), and the first cavity (11) is filled with damping liquid. The damping component (2) is installed below the housing (1). The damping component (2) includes a sliding rod (21), a damping plate (22), a mass block (23), a helical spring (24), and an electromagnet (25). The sliding rod (21) passes through the bottom plate of the first cavity (11) in the vertical direction. The top of the sliding rod (21) extends into the first cavity (11) and is connected to the damping plate (22). The bottom of the sliding rod (21) extends out of the housing (1) and is connected to the mass block (23). The helical spring (24) is arranged between the damping plate (22) and the bottom plate of the first cavity (11). An electromagnet (25) is provided inside the helical spring (24). The electromagnet (25) is connected to the damping plate (22). The electromagnet (25) and the helical spring (24) form an electric current loop, and the electromagnet (25) can apply an electromagnetic resistance to the helical spring (24) through the magnetic field.

2. The vibration damping device according to claim 1, wherein: A sliding hole for the sliding rod (21) to pass through is provided on the bottom plate of the first cavity (11), and a seal (26) is installed in the sliding hole. The sliding rod (21) passes through the seal (26).

3. The vibration damping device according to claim 2, characterized in that: The seal (26) includes a seal sleeve (261), a sealing ring (262), and a positioning ring (263). The seal sleeve (261) is fixedly connected to the side wall of the sliding hole. Both the sealing ring (262) and the positioning ring (263) are fixedly connected inside the seal sleeve (261). The sliding rod (21) passes through both the sealing ring (262) and the positioning ring (263) at the same time. There are two sealing rings (262), and the two sealing rings (262) are arranged on both sides of the positioning ring (263) along the axial direction of the seal sleeve (261).

4. The shock absorber according to claim 3, characterized in that: Steel balls (2631) are provided inside the positioning ring (263), and part of the steel balls (2631) extends out of the positioning ring (263) and contacts the side wall of the sliding rod (21).

5. The shock absorber according to claim 1, characterized in that: A baffle (12) is fixedly connected to the top surface of the top plate of the housing (1). The baffle (12) extends along the circumference of the housing (1) and forms a closed cross-section. A second cavity (13) is formed inside the baffle (12). The top of the second cavity (13) is open. Embedded steel bars (3) inserted into the second cavity (13) are provided at the bottom of the floor slab. A first grouting port is provided on the side wall of the baffle (12).

6. The shock absorber according to claim 5, characterized in that: A connecting pipe (14) is fixedly connected to the top surface of the bottom plate of the second cavity (13). The connecting pipe (14) is arranged in the vertical direction. A connecting steel sleeve (4) is embedded in the floor slab. A connecting groove (41) for inserting the connecting pipe (14) is provided in the connecting steel sleeve (4). A grouting groove (141) is vertically formed in the connecting pipe (14). A second grouting port (142) is formed in the side wall of the connecting pipe (14). One end of the second grouting port (142) communicates with the second cavity (13), and the other end communicates with the grouting groove (141).

7. The shock absorber according to claim 6, characterized in that: A matching hole (143) is formed in the side wall of the connecting pipe (14). A plug pin (144) slides in the matching hole (143). An annular groove (42) for inserting the plug pin (144) is formed in the side wall of the connecting groove (41). When grouting in the grouting groove (141), the plug pin (144) moves towards the annular groove (42) under the push of the concrete, and a part of the plug pin (144) is inserted into the annular groove (42).

8. The vibration damping device according to claim 7, characterized in that: A mixing groove (145) is axially formed in the outer side wall of the connecting pipe (14). A grouting gap (43) is left between the top of the connecting pipe (14) and the connecting groove (41) for the concrete to flow out from the top of the grouting groove (141) and then enter the grouting gap (43), and then flow into the mixing groove (145) and flow along the mixing groove (145) into each annular groove (42).

9. A vibration damping system for the floor slab of a building near a subway, characterized in that: Comprising the vibration damping device according to any one of claims 1-8, further comprising an acceleration sensor. The acceleration sensor is arranged in a subway tunnel near a building floor slab. The electromagnet (25) is connected through a controller. The acceleration sensor is electrically connected to the controller to transmit an electrical signal to the controller, and the controller controls the output of the energizing current to the electromagnet (25).

10. A vibration damping system according to claim 9, characterized in that: The housing (1) is set to be in a cuboid shape or a cylinder shape. When the housing (1) is set to have a rectangular bottom surface, the damping assemblies (2) are arranged on two diagonals on the horizontal plane of the bottom plate, respectively located at the one-half, one-quarter, and one-sixth positions on the two diagonals; When the housing (1) is set to have a circular bottom surface, the damping assemblies (2) are arranged on two mutually perpendicular diameter lines on the horizontal plane of the bottom plate, respectively located at the one-half, one-quarter, and one-sixth positions on the two diameter lines.

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