A vibration reduction device for the bottom of the corridor under the track of a large shield tunnel

Abstract

The present invention belongs to the technical field of vibration reduction of rail transit structures and discloses a vibration reduction device for a large shield tunnel corridor. The device dissipates vibration energy through friction between a friction elastic vibration reduction component including an outer vibration reduction ring, an inner vibration reduction ring, and a rigid friction ring, deformation of the material, and viscoelastic damping force provided by a viscoelastic vibration reduction component including an inner guide rod, a viscoelastic damping layer, and the inner and outer walls of a cylindrical damper. Finally, the device is combined using a rigid vibration reduction shell and an annular rubber strip. The vibration reduction device for the corridor corridor provided by the present invention can effectively reduce vibration transmitted to the shield tunnel through the corridor corridor, reduce the impact on the shield tunnel, and improve the structural safety and environmental friendliness of tunnel rail transit operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of vibration reduction of rail transit structures, and in particular relates to a vibration reduction device for the bottom of a corridor under a large shield track. Background Art

[0002] As the most fundamental component of a tunnel, the sub-track corridor typically utilizes cast-in-place concrete inverts, subject to frequent vibration from trains. This vibration is directly transmitted from the sub-track corridor to the shield tunnel. The sub-track corridor often fails to provide adequate pressure dissipation, effectively mitigating the impact and pressure on the tunnel segments. This can lead to defects such as cracking and damage. These defects can negatively impact railway operations and passenger comfort, and in severe cases, even endanger driving safety. Therefore, vibration reduction in the tunnel substructure has become a significant concern during tunnel construction.

[0003] Current vibration reduction measures increase overall structural complexity and cost by modifying the corridor. Furthermore, traditional box culvert structures, lacking effective joint management and longitudinal continuity, fail to prevent vibration propagation, significantly reducing their effectiveness. Therefore, it is necessary to develop an innovative, economical, effective, and easy-to-install method to address this issue without altering the corridor's existing structure. Summary of the Invention

[0004] In order to overcome the problems existing in the related art, the present invention discloses a vibration reduction device for a corridor under a large shield tunnel. The technical solution is as follows:

[0005] The present invention is achieved by providing a large shield tunnel corridor vibration reduction device, the device comprising:

[0006] The friction elastic vibration damping assembly includes an outer vibration damping ring, an inner vibration damping ring, and a rigid friction ring. The rigid friction ring is centered, and the outer and inner vibration damping rings are symmetrically distributed on both sides of the rigid friction ring. The three rings are coaxial, and multiple sets of rings are stacked.

[0007] The viscoelastic vibration damping component includes an inner guide rod, a viscoelastic damping layer, a cylindrical damping outer wall, and a cylindrical damping inner wall. The viscoelastic damping layer and the cylindrical damping inner and outer walls are coaxially distributed.

[0008] The vibration damping housing consists of an upper rigid vibration damping housing, a lower rigid vibration damping housing, and an annular rubber strip. A gap is left between the upper and lower housings to allow for the necessary displacement for vibration reduction. The annular rubber strip fills the gap between the upper rigid vibration damping housing and the lower portion of the device.

[0009] The force-transmitting rubber pad fits tightly with the upper support plate, so that the vibration is transmitted to the vibration reduction component more evenly, preventing stress concentration from causing damage to the vibration reduction device.

[0010] Furthermore, in the friction elastic vibration damping assembly, the inner diameter D1 of the outer vibration damping ring, the outer diameter D2 of the inner vibration damping ring, and the middle diameter ((outer diameter + inner diameter) / 2) D3 of the rigid friction ring must satisfy the following relationship to prevent interference between the rings:

[0011]

[0012] Furthermore, in the friction elastic vibration damping assembly, the vibration damping ring and the rigid friction ring are tightly attached, d is the distance between two adjacent outer rings (or inner rings), h is the height of a single ring, β is the cone angle of the inner and outer rings, and the width l of the adjacent contact surfaces satisfies the following relationship:

[0013]

[0014] Furthermore, the viscoelastic damping layer in the viscoelastic vibration damping assembly is respectively located between the outer wall of the cylindrical damping and the inner wall of the cylindrical damping, and between the inner wall of the cylindrical damping and the inner guide rod.

[0015] Furthermore, the inner guide rod is matched with the opening of the upper support plate, and the radial freedom of the support plate is restricted, so that it can only slide along the inner guide rod.

[0016] Furthermore, a protrusion is provided on the top of the inner guide rod shaft, and a locking nut is engaged with the upper support plate. The locking nut on the support rod limits the displacement of the friction elastic vibration damping assembly to prevent the vibration damping structure from being damaged by tension.

[0017] Furthermore, when the friction elastic vibration damping assembly is subjected to force, the diameter of the vibration damping ring will change: the diameter of the outer ring will expand and the diameter of the inner ring will shrink, so an appropriate gap should be left between the vibration damping shell and the friction elastic vibration damping assembly.

[0018] Furthermore, the friction elastic vibration damping component is made of shape memory alloy SMA.

[0019] Furthermore, the annular rubber strip is made of low elastic modulus rubber.

[0020] Combining all the above technical solutions, the advantages and positive effects of the present invention are as follows:

[0021] Strong vibration reduction and energy dissipation capabilities: Vibration amplitude and energy transfer are effectively reduced through the combination of viscoelastic vibration reduction components and friction elastic vibration reduction components.

[0022] Highly designable: The friction-elastic vibration damping assembly of this invention can be adjusted to specific geological conditions and construction requirements. By adjusting factors such as the number of damping rings and wire diameter, the structural stiffness can be varied. This flexibility makes the structure well-suited for complex and changing working environments, providing stable vibration damping in diverse conditions.

[0023] Strong self-recovery ability: The friction elastic vibration reduction component is made of shape memory alloy SMA, which has a strong self-reset function, stable and repeatable performance, which helps to restore the structural structure after vibration and keep the vibration isolation structure in the elastic deformation stage without damage.

[0024] High material utilization rate: The energy storage capacity per unit volume of the friction elastic vibration damping component is greater than that of other types of springs, which can save the space required for the device and has good economy. It is suitable for occasions with limited space size but requiring to absorb a large amount of energy.

[0025] Good durability and long service life: The friction elastic vibration damping component consists of multiple pairs of inner and outer rings. Even if individual rings are damaged, they can continue to work without causing complete failure, which provides safety protection. At the same time, the vibration-damping shell is designed to prevent external foreign matter from invading the core vibration damping component. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure;

[0027] Figure 1 This is a front cross-sectional view of the structure of the under-rail corridor vibration reduction equipment provided by an embodiment of the present invention;

[0028] Figure 2 This is a schematic structural diagram of a vibration reduction device for a sub-track corridor provided by an embodiment of the present invention;

[0029] Figure 3 This is a cross-sectional view of a rail corridor vibration reduction device provided by an embodiment of the present invention;

[0030] Figure 4 This is a structural diagram of the friction elastic vibration damping assembly provided by an embodiment of the present invention.

[0031] Figure 5 This is a schematic diagram of the completed installation of the under-rail corridor vibration reduction device provided by an embodiment of the present invention;

[0032] In the figure: 1. Force transmission rubber pad; 2. Inner guide rod; 3. Inner wall of cylindrical damping; 4. Positioning nut; 5. Outer vibration damping ring; 6. Rigid friction ring; 7. Inner vibration damping ring; 8. Viscoelastic damping layer; 9. Upper rigid vibration damping shell; 10. Annular rubber strip; 11. Lower rigid vibration damping shell; 12. Outer wall of cylindrical damping; 13. Fixing screw hole; 14. Vibration reduction equipment for under-track corridor; 15. Under-track corridor. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] A large shield tunnel under-track corridor vibration reduction device, the device comprising:

[0035] The friction elastic vibration damping assembly includes an outer vibration damping ring, an inner vibration damping ring, and a rigid friction ring. The rigid friction ring is centered, and the outer and inner vibration damping rings are symmetrically distributed on both sides of the rigid friction ring. The three rings are coaxial, and multiple sets of rings are stacked.

[0036] The viscoelastic vibration damping component includes an inner guide rod, a viscoelastic damping layer, a cylindrical damping outer wall, and a cylindrical damping inner wall. The viscoelastic damping layer and the cylindrical damping inner and outer walls are coaxially distributed.

[0037] The vibration damping housing consists of an upper rigid vibration damping housing, a lower rigid vibration damping housing, and an annular rubber strip. A gap is left between the upper and lower housings to allow for the necessary displacement for vibration reduction. The annular rubber strip fills the gap between the upper rigid vibration damping housing and the lower portion of the device.

[0038] The force-transmitting rubber pad fits tightly with the upper support plate, so that the vibration is transmitted to the vibration reduction component more evenly, preventing stress concentration from causing damage to the vibration reduction device.

[0039] Furthermore, in the friction elastic vibration damping assembly, the inner diameter d1 of the outer vibration damping ring, the outer diameter D2 of the inner vibration damping ring, and the middle diameter ((outer diameter + inner diameter) / 2) D3 of the rigid friction ring must satisfy the following relationship to prevent interference between the rings:

[0040]

[0041] Furthermore, in the friction elastic vibration damping assembly, the vibration damping ring and the rigid friction ring are tightly attached, d is the distance between two adjacent outer rings (or inner rings), h is the height of a single ring, β is the cone angle of the inner and outer rings, and the width l of the adjacent contact surfaces satisfies the following relationship:

[0042]

[0043] Furthermore, the viscoelastic damping layer in the viscoelastic vibration damping assembly is respectively located between the outer wall of the cylindrical damping and the inner wall of the cylindrical damping, and between the inner wall of the cylindrical damping and the inner guide rod.

[0044] Furthermore, the inner guide rod is matched with the opening of the upper support plate, and the radial freedom of the support plate is restricted, so that it can only slide along the inner guide rod.

[0045] Furthermore, a protrusion is provided on the top of the inner guide rod shaft, and a locking nut is engaged with the upper support plate. The locking nut on the support rod limits the displacement of the friction elastic vibration damping assembly to prevent the vibration damping structure from being damaged by tension.

[0046] Furthermore, when the friction elastic vibration damping assembly is subjected to force, the diameter of the vibration damping ring will change: the diameter of the outer ring will expand and the diameter of the inner ring will shrink, so an appropriate gap should be left between the vibration damping shell and the friction elastic vibration damping assembly.

[0047] Furthermore, the friction elastic vibration damping component is made of shape memory alloy SMA.

[0048] Furthermore, the annular rubber strip is made of low elastic modulus rubber.

[0049] Example 1, with reference to Figure 1-4 As shown, an embodiment of the present invention provides a vibration reduction device for the bottom of a corridor under a large shield track, comprising:

[0050] The friction elastic vibration damping assembly, whose function is to support the overall structure while preventing corridor vibration waves from being transmitted to the shield tunnel, includes an outer vibration damping ring 5, an inner vibration damping ring 7, and a rigid friction ring 6. The rigid friction ring is centered, and the outer and inner vibration damping rings are symmetrically distributed on both sides of the rigid friction ring. The three rings are coaxial, and multiple groups of rings are stacked. The inner and outer vibration damping rings at the bottom are fixed to the foundation. Because the conical surfaces of the inner and outer rings are completely in contact when the upper and lower vibration damping rings are completely tightened, the entire friction elastic vibration damping assembly is equivalent to a solid structure, and the stiffness approaches infinity, which makes the vibration damping meaningless. To avoid this, the upper and lower adjacent rings should maintain a minimum spacing during the extreme use of normal operation.

[0051] The viscoelastic vibration damping assembly, designed to prevent corridor vibration waves from transmitting to the shield tunnel, comprises an inner guide rod 2, a viscoelastic damping layer 8, a cylindrical damping outer wall 12, and a cylindrical damping inner wall 3. The viscoelastic damping layer 8 and the inner and outer cylindrical damping walls are coaxially distributed and connected to the inner and outer cylindrical damping walls via a vulcanization process. This assembly leverages the hysteretic energy dissipation properties of the viscoelastic material to provide additional stiffness and damping to the structure, reducing its dynamic response and ultimately achieving vibration reduction.

[0052] When the underrail vibration damping device is subjected to an external load, the load is first evenly transferred to the upper support plate through the force-transmitting rubber pad 1, driving the upper support plate downward. Due to the support provided by the friction-elastic vibration damping assembly, the outer and inner vibration damping rings 5 ​​and 7 are subjected to forces that cause relative motion with the conical surface of the rigid friction ring 6. This generates significant friction on the contact surfaces, and the loading and unloading characteristic curves do not coincide. During loading, the vertical axial force is balanced by the pressure perpendicular to the contact surface and the friction parallel to the contact surface. This friction requires a greater axial force to compress the vibration damping rings, effectively increasing their stiffness. Simultaneously, as the upper support plate moves downward, the cylindrical damping inner wall 3, the cylindrical damping outer wall 12, and the inner guide rod 2 move relative to each other. The viscoelastic damping layer between them generates a force in the opposite direction of the loading direction, preventing further displacement. During unloading, the friction reverses, hindering the vibration damping rings' ability to recover. Unloading now requires only a smaller axial force, effectively reducing their stiffness. At this time, the vibration isolation structure maintains an elastic deformation stage without damage through the deformation recovery characteristics of the shape memory alloy SMA material and the hysteresis energy dissipation characteristics of the viscoelastic material.

[0053] Rigid vibration-damping shell: includes an upper rigid vibration-damping shell 9, a lower rigid vibration-damping shell 11 and an annular rubber strip 10. A gap is left between the upper and lower shells to allow room for the displacement required for vibration reduction, while limiting the horizontal displacement of the friction elastic vibration-damping component. The annular rubber strip 10 fills the gap between the upper rigid vibration-damping shell 9 and the lower part of the device to prevent foreign matter from invading the internal vibration-damping component, which makes it have a longer service life in harsh environments. It can protect and fix the internal vibration-damping device and improve the overall durability of the device. The final structure of the under-rail corridor vibration-damping equipment is as follows: Figure 5 shown.

[0054] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0055] The above description is only a preferred specific implementation method of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions and improvements made by any technician familiar with this technical field within the technical scope disclosed by the present invention and within the spirit and principles of the present invention should be covered by the scope of protection of the present invention.

Claims

1. A large shield tunnel corridor vibration reduction device, characterized in that: include: The vibration-damping shell includes an upper rigid vibration-damping shell, a lower rigid vibration-damping shell, and an annular rubber strip. The upper rigid vibration-damping shell and the lower rigid vibration-damping shell are cylindrical. The peripheral wall of the upper rigid vibration-damping shell is inserted into the lower rigid vibration-damping shell, and a gap is left between the upper rigid vibration-damping shell and the bottom surface of the lower rigid vibration-damping shell. The annular rubber strip fills the gap. A friction elastic vibration damping assembly is provided in the vibration damping housing and supports the upper rigid vibration damping housing and the lower rigid vibration damping housing, comprising an outer vibration damping ring, an inner vibration damping ring and a rigid friction ring, wherein the rigid friction ring is in the center, the outer vibration damping ring and the inner vibration damping ring are symmetrically distributed on both sides of the rigid friction ring, and the outer vibration damping ring, the inner vibration damping ring and the rigid friction ring are coaxial; a viscoelastic vibration damping assembly, disposed in the vibration damping housing and located inside the friction elastic vibration damping assembly, comprising an inner guide rod, a viscoelastic damping layer, a cylindrical damping outer wall, and a cylindrical damping inner wall; the inner guide rod is disposed in the lower rigid vibration damping housing; the cylindrical damping inner wall is disposed in the upper rigid vibration damping housing and surrounds the outer side of the inner guide rod; the cylindrical damping outer wall is disposed in the lower rigid vibration damping housing and surrounds the outer side of the cylindrical damping inner wall; the viscoelastic damping layer is filled between the inner guide rod, the cylindrical damping outer wall, and the cylindrical damping inner wall; A force-transmitting rubber pad, which is in close contact with the upper support plate and is provided on the top of the upper rigid vibration-damping housing; The inner guide rod is slidably provided on the upper support plate to limit the radial freedom of the support plate; the outer vibration resistance ring and the inner vibration resistance ring are both multiple in number, and the multiple outer vibration resistance rings and the inner vibration resistance rings are stacked along the axial direction of the rigid friction ring; The friction elastic vibration damping component is made of shape memory alloy SMA.

2. A large shield tunnel under-track corridor vibration reduction device according to claim 1, characterized in that: In the friction elastic vibration damping assembly, the inner diameter of the outer vibration damping ring , outer diameter of internal resistance vibration ring , rigid friction ring middle diameter , satisfying the following relations: 。 3. The large shield tunnel under-track corridor vibration reduction device according to claim 1, characterized in that: The vibration damping ring and the rigid friction ring in the friction elastic vibration damping assembly are tightly attached. is the distance between two adjacent outer vibration-blocking rings or inner vibration-blocking rings, is the height of a single ring, is the cone angle of the inner and outer rings, and the width of the adjacent contact surfaces The following relations are satisfied: 。 4. The large shield tunnel under-track corridor vibration reduction device according to claim 1, characterized in that: A protrusion is provided on the top of the inner guide rod, and the upper support plate stops the protrusion from moving toward the lower rigid vibration-damping shell.

5. The large shield tunnel under-track corridor vibration reduction device according to claim 1, characterized in that: A gap is left between the vibration-damping shell and the friction elastic vibration-damping component.

6. The large shield tunnel under-track corridor vibration reduction device according to claim 1, characterized in that: The annular rubber strip is made of low elastic modulus rubber.

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