SMA flexible damping node device

Abstract

The utility model discloses an SMA (Shape Memory Alloy) flexible damping node device which comprises an elastic waterproof cushion block arranged in a gap between tunnel ring pieces; the omega water-stop belt is mounted below a gap between the tunnel ring pieces; the steel pressing plates are mounted on the pre-embedded steel plates between the lower portions of the tunnel ring pieces correspondingly and located on the two sides of the gap; vertical connecting steel plates are symmetrically fixed on the pair of steel pressing plates; the two ends of the SMA rod are fixed to the connecting steel plates through nuts respectively, and the SMA rod deforms under the external vibration effect through the superelastic effect and absorbs vibration energy. The shock absorption device can quickly respond and effectively absorb shock under the action of vibration or earthquake, so that the shock resistance of a tunnel structure is improved, and the service life of the tunnel structure is prolonged.

Description

Technical Field

[0001] This utility model relates to tunnel vibration reduction technology, specifically a shape memory alloy SMA flexible vibration damping node device, which can effectively achieve vibration reduction, buffering, and waterproofing functions between tunnel rings. This technology is mainly applied in tunnel engineering, improving the tunnel's seismic performance, slowing the transmission of external vibrations, and providing excellent waterproofing. Background Technology

[0002] With the advancement of urbanization, tunnel engineering is increasingly widely used in transportation, subways, underground pipelines, and other fields. Tunnels are susceptible to severe impacts when encountering earthquakes or external vibrations, especially at tunnel ring connections. Traditional tunnel vibration reduction methods mainly rely on rigid structures or conventional damping materials, which often have shortcomings in terms of damping effect, durability, and ease of installation. Common measures include the use of seismic isolation and flexible devices. Seismic isolation methods reduce the dynamic response of the tunnel lining structure by placing a certain material between the surrounding rock and the tunnel lining structure or changing the mechanical properties of the surrounding rock within a certain range outside the lining, and appropriately adjusting the stiffness of these materials. However, seismic isolation measures require enclosing the tunnel, resulting in high material costs and inconvenient construction. Summary of the Invention

[0003] This invention provides a flexible vibration damping node structure for tunnels based on shape memory alloy (SMA) material. By rationally designing the node components, the superelastic effect of SMA is utilized to achieve vibration damping and buffering functions. Combined with two effective waterproofing measures, this ensures that the device can provide good vibration damping performance, strength stability, and waterproofing effect at the tunnel ring joint.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A flexible SMA damping joint device includes:

[0006] Elastic waterproof pads are installed in the gaps between tunnel rings to provide waterproofing and have compressibility.

[0007] Ω-shaped waterstops are installed below the gaps between tunnel rings to provide waterproofing.

[0008] A pair of pressure plates are installed on the pre-embedded steel plates between the tunnel ring sections, and are located on both sides of the gap;

[0009] A pair of pressure plates are symmetrically fixed with vertical connecting steel plates, and are also provided with armhole steel plates;

[0010] The two ends of the SMA rod are fixed to the connecting steel plate with nuts. The SMA rod deforms and absorbs vibration energy under external vibration through the superelastic effect of the rod.

[0011] The pressure plate has bolt holes and is fixed to the embedded steel plate by bolts and nuts.

[0012] Embedded steel plates, pressure plates, haunch plates, and connecting steel plates form external components to provide strength, stability, and installation support. Elastic waterproof gaskets are installed in the node structure to provide good water-stopping function and a large amount of compressive deformation. An Ω-shaped waterstop is used as a second layer of waterproofing, with a maximum permissible inter-ring opening of [number] times the upper limit requirement. The Ω-shaped waterstop and the elastic waterproof gaskets work together to provide better waterproofing and allow deformation within a certain range.

[0013] SMA rods are made of shape memory alloy (SMA) material. Utilizing its superelastic effect, they undergo significant deformation under external vibrations or seismic loads, absorbing vibrational energy and thus providing damping. As a smart material, shape memory alloy (SMA) possesses the property of undergoing a phase transition and recovering its original shape upon temperature changes. In recent years, the application of SMA materials in building, bridge, and tunnel vibration damping has received increasing attention. However, existing SMA damping node structures have not yet fully realized their potential in tunnel vibration damping.

[0014] Therefore, this invention proposes a flexible damping node structure for tunnels based on SMA material, which can respond quickly and effectively dampen vibrations under vibration or seismic action, thereby improving the seismic resistance and service life of the tunnel structure. Attached Figure Description

[0015] Figure 1 This is a structural plan view of the SMA flexible damping node device of this utility model.

[0016] Figure 2 This is a structural elevation view of the SMA flexible vibration damping node device of this utility model. Detailed Implementation

[0017] The specific technical solution of this utility model is described in conjunction with the accompanying drawings.

[0018] like Figure 1 and Figure 2 A flexible vibration damping joint device for SMA includes:

[0019] The elastic waterproof pad 8 is installed in the gap between the tunnel rings 9 to provide water-stopping function and has compression deformation capacity;

[0020] Ω-waterstop 7, installed below the gap between the tunnel ring plates 9, provides waterproofing;

[0021] A pair of pressure steel plates 1 are respectively installed on the pre-embedded steel plates between the tunnel ring plates 9, and are located on both sides of the gap;

[0022] A pair of pressure steel plates 1 are symmetrically fixed with vertical connecting steel plates 3, and are provided with armhole steel plates 5;

[0023] Both ends of the SMA rod 6 are fixed to the connecting steel plate 3 by nuts 2. The SMA rod 6 deforms and absorbs vibration energy under external vibration through the superelastic effect of the SMA rod 6.

[0024] The pressure plate 1 is provided with bolt holes 4, which are fixed to the embedded steel plate by bolts and nuts.

[0025] At the first ring of the tunnel exiting the working shaft and at the end of the end reinforcement, a special steel pipe segment with SMA flexible vibration damping node is installed. Each pipe segment is equipped with 40 sets of SMA vibration damping nodes. At the same time, 56 M42 bolts are used to locally reinforce the joint bolts at the first 40m of the shield tunnel.

[0026] During shield tunnel construction, bolt connection holes and embedded steel plates are pre-drilled at locations requiring vibration damping to facilitate later positioning and installation. Then, the Ω-shaped waterstop 7 is installed. Before installation, the surface of the tunnel segment 9 needs to be cleaned to ensure there are no loose materials or other contaminants. The Ω-shaped waterstop 7 is then placed at the vibration damping nodes, and a pressure plate 1 is installed on top, secured to the surface of the tunnel segment 9 with bolts. Finally, the SMA rod 6 is secured to the connecting steel plate 3 using double nuts, completing the installation of the vibration damping device.

Claims

1. A flexible SMA damping joint device, characterized in that, include: Elastic waterproof pads (8) are installed in the gaps between tunnel rings (9) to provide waterproofing and have compressive deformation capacity; A pair of pressure steel plates (1) are respectively installed on the pre-embedded steel plates between the tunnel ring plates (9) and located on both sides of the gap; A pair of pressure plates (1) are symmetrically fixed with vertical connecting plates (3); The two ends of the SMA rod (6) are fixed to the connecting steel plate (3) by nuts (2). The SMA rod (6) deforms and absorbs vibration energy under external vibration through the superelastic effect of the SMA rod (6).

2. The SMA flexible damping joint device according to claim 1, characterized in that, It also includes an Ω-waterstop (7), installed below the gap between the tunnel rings (9), to provide waterproofing.

3. The SMA flexible damping joint device according to claim 1, characterized in that, It also includes a haunch plate (5), a connecting pressure plate (1), and a connecting plate (3).

4. The SMA flexible damping joint device according to claim 1, characterized in that, The pressure plate (1) is provided with bolt holes (4) and is fixed to the pre-embedded steel plate by bolts and nuts.

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