Underground vibration isolation wall and construction method thereof

Abstract

The invention relates to the technical field of vibration isolation walls, and discloses an underground vibration isolation wall and a construction method thereof.The underground vibration isolation wall comprises a wall body, vibration isolation assemblies and fasteners, and the wall body is arranged between a subway tunnel and a basement; the wall body is divided into a plurality of vibration isolation sections in the height direction of the wall body, and each vibration isolation section corresponds to a soil layer around the wall body; the vibration isolation assemblies are arranged on one side or two sides of the wall body of each vibration isolation section; each vibration isolation assembly comprises at least one rigid vibration isolation layer and at least one flexible vibration isolation layer, the rigid vibration isolation layers and the flexible vibration isolation layers are alternately arranged in the thickness direction of the wall body, and the rigid vibration isolation layers and the flexible vibration isolation layers are connected through a plurality of fasteners; and the fastener is fixedly connected with a wall body. The technical problems that in the prior art, a vibration isolation layer of an underground vibration isolation wall is single in material and unchanged in thickness, the vibration isolation effect of the underground vibration isolation wall is the same as a whole, vibration isolation cannot be conducted according to vibration propagation characteristics and vibration isolation requirements of different soil layers, and the vibration isolation effect of the underground vibration isolation wall is poor are solved.

Description

Technical Field

[0001] This invention relates to the field of vibration isolation wall technology, and in particular to an underground vibration isolation wall and its construction method. Background Technology

[0002] Currently, subways, as an efficient, convenient, and environmentally friendly mode of urban transportation, have become an important part of many large and medium-sized cities. However, subways emit vibration waves during operation, causing vibrations in surrounding buildings. Underground continuous walls, typically made of reinforced concrete, are a single material with limited vibration isolation. This is especially true in bedrock or hard soil conditions, where the wave impedance difference between the soil layer and the reinforced concrete is small, making vibration waves propagate more easily and resulting in even worse vibration isolation. This can lead to structural damage, reduced building lifespan, and even safety hazards.

[0003] To improve vibration isolation performance, existing technologies employ methods such as installing vibration isolation walls between underground buildings and subway tunnels. For example, Chinese Patent Publication No. CN220888746U discloses an underground vibration isolation wall, including a frame arranged between the subway tunnel and the building foundation. The frame comprises alternately arranged support cavities and isolation cavities, with ordinary concrete blocks placed in the support cavities and foamed concrete blocks placed in the isolation cavities. In this technical solution, ordinary concrete blocks are used to enhance the strength of the vibration isolation wall, and foamed concrete blocks are used to attenuate the propagation of subway vibration waves. However, this underground vibration isolation wall uses foamed concrete of constant thickness as the isolation layer within its height range. The isolation layer material is singular and its thickness is constant, resulting in a uniform overall vibration isolation effect. However, subway construction sites typically contain multiple different soil layers with varying vibration propagation characteristics and isolation requirements. The aforementioned underground vibration isolation wall cannot isolate vibrations according to the different vibration propagation characteristics and isolation requirements of each soil layer, leading to poor vibration isolation performance. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that the vibration isolation layer material of the underground vibration isolation wall in the prior art is uniform and the thickness is constant, and the vibration isolation effect of the underground vibration isolation wall is the same as the whole. It is impossible to isolate vibration according to the vibration propagation characteristics and vibration isolation requirements of different soil layers, resulting in poor vibration isolation effect of the underground vibration isolation wall.

[0005] To address the aforementioned technical problems, the present invention provides an underground vibration isolation wall, comprising: The wall is located between the subway tunnel and the basement; The wall is divided into multiple vibration isolation sections along its height, and each vibration isolation section corresponds to a layer of soil around the wall. Vibration isolation components are installed on one or both sides of the wall in each vibration isolation section; Each vibration isolation component includes at least one rigid vibration isolation layer and at least one flexible vibration isolation layer. The rigid vibration isolation layer and the flexible vibration isolation layer are arranged alternately along the thickness direction of the wall. The rigid vibration isolation layer and the flexible vibration isolation layer are connected by multiple fasteners. Fasteners are used to securely connect the fasteners to the wall.

[0006] Preferably, the vibration isolation section includes at least one first vibration isolation section opposite to the soft soil layer and at least one second vibration isolation section opposite to the hard soil layer; The vibration isolation assembly includes a first vibration isolation assembly disposed in a first vibration isolation section and a second vibration isolation assembly disposed in a second vibration isolation section; The first vibration isolation component includes a first flexible vibration isolation layer disposed on the wall and a first rigid vibration isolation layer disposed on the side of the first flexible vibration isolation layer away from the wall, the first flexible vibration isolation layer and the first rigid vibration isolation layer being connected by fasteners. The second vibration isolation assembly includes a second flexible vibration isolation layer disposed on the wall, a second rigid vibration isolation layer disposed on the side of the second flexible vibration isolation layer away from the wall, and a third flexible vibration isolation layer disposed on the side of the second rigid vibration isolation layer away from the wall. The second flexible vibration isolation layer, the second rigid vibration isolation layer, and the third flexible vibration isolation layer are connected by fasteners.

[0007] Preferably, the underground vibration isolation wall also includes a steel reinforcement cage, into which concrete is poured to form the wall. The fasteners connecting the first vibration isolation component and the fasteners connecting the second vibration isolation component are both fixedly connected to the reinforcing cage.

[0008] Preferably, mounting holes are provided on the first flexible vibration isolation layer, the second flexible vibration isolation layer, the third flexible vibration isolation layer, the first rigid vibration isolation layer, and the second rigid vibration isolation layer; Each fastener includes a screw inserted into a mounting hole. One end of the screw is stopped and mounted on the first rigid vibration isolation layer or the third flexible vibration isolation layer. A limit nut is provided in the middle of the screw. The stop part of the screw and the limit nut are used to position the first vibration isolation component / second vibration isolation component. The end of the screw closest to the wall is fixed to the steel cage.

[0009] Preferably, one end of the screw close to the wall overlaps the horizontal distribution bar of the reinforcing cage, and two connectors are fixedly connected to both sides of the screw, with the reinforcing cage fixedly connected to the two connectors.

[0010] Preferably, the connector includes a first plate and a second plate that are perpendicular to each other and fixedly connected. Along the extension direction of the wall, a second plate is fixedly connected to each side of the screw. The first plate, which is fixedly connected to each second plate, is fixedly connected to the reinforcing cage. The right-angle openings of the two connectors located on both sides of the screw are oriented away from each other.

[0011] Preferably, the bottom of the wall is lower than the subway tunnel, and the vertical distance between the bottom of the wall and the subway tunnel is not less than m.

[0012] Preferably, the flexible vibration isolation layer is a rubber layer or a PVC board, and the rigid vibration isolation layer is a steel plate.

[0013] This invention provides a construction method for an underground vibration isolation wall, which includes the following steps: S1. Construct the steel reinforcement cage for the wall and fix each vibration isolation group onto the steel reinforcement cage to form the vibration isolation wall frame; S2. Excavate a trench to accommodate the vibration isolation wall frame; S3. Lower the vibration isolation wall frame into the trench; S4. Pour concrete into the trench, and fill the reinforcing cage with concrete; S5. Backfill the trench.

[0014] Compared with the prior art, the underground vibration isolation wall and its construction method of this invention have the following advantages: An embodiment of the present invention discloses an underground vibration isolation wall and its construction method, which divides the wall into multiple vibration isolation sections along the height direction, and each vibration isolation section corresponds to a specific soil layer. Vibration isolation components are fixedly installed in each vibration isolation section by fasteners. The vibration isolation components are composed of alternating rigid vibration isolation layers and flexible vibration isolation layers. There is a large wave impedance difference between the rigid vibration isolation layer and the flexible vibration isolation layer. When the vibration wave passes through the contact surface between the rigid vibration isolation layer and the flexible vibration isolation layer, the wave will be reflected, scattered and attenuated, effectively attenuating the energy of the vibration wave propagation. Its vibration isolation effect is more efficient than that of a single material relying on its own damping energy absorption.

[0015] Furthermore, by using fasteners to firmly connect the vibration isolation layer to the wall, the integrity and stability of the entire composite vibration isolation system under long-term vibration environment are ensured, preventing the layers from separating or misaligning, and ensuring the stability of the vibration isolation wall.

[0016] Compared with traditional single-material or uniform-thickness vibration isolation layers, the embodiments of this invention, through zonal design, can dynamically adjust the rigidity and flexibility configuration of the vibration isolation layer according to the wave impedance and vibration frequency characteristics of different soil layers. This allows for targeted design of the vibration isolation components, enabling the vibration isolation wall to meet the blocking requirements of high-frequency vibrations in hard soil layers while adapting to the absorption requirements of low-frequency vibrations in soft soil layers. This significantly improves the comprehensive vibration isolation performance of the vibration isolation wall across the entire depth range, reduces the cumulative damage of vibration to the building structure, extends the service life of the building, and enhances safety. It solves the technical problem in the prior art where the vibration isolation layer material of underground vibration isolation walls is single and the thickness is constant, resulting in a uniform vibration isolation effect. This makes it impossible to isolate vibrations according to the vibration propagation characteristics and vibration isolation requirements of different soil layers, leading to poor vibration isolation performance of underground vibration isolation walls. Attached Figure Description

[0017] Figure 1 This is a layout diagram of the underground vibration isolation wall according to an embodiment of the present invention; Figure 2 This is a structural diagram of the underground vibration isolation wall according to an embodiment of the present invention; Figure 3 This is a structural diagram of the vibration isolation wall frame according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 3 Enlarged view of point A; Figure 5 This is a cross-sectional view of the underground vibration isolation wall according to an embodiment of the present invention.

[0018] In the diagram, 1. Wall; 2. Vibration isolation assembly; 2a. First vibration isolation assembly; 2b. Second vibration isolation assembly; 21a. First rigid vibration isolation layer; 21b. Second rigid vibration isolation layer; 22a. First flexible vibration isolation layer; 22b. Second flexible vibration isolation layer; 22c. Third flexible vibration isolation layer; 3. Fastener; 31. Screw; 32. Stop; 33. Limit nut; 4. Connector; 41. First plate; 42. Second plate; 5. Reinforcing cage; 51. Horizontal distribution reinforcement; 7. Basement; 8. Vibration isolation wall frame; 9. Vibration isolation section; 91. First vibration isolation section; 92. Second vibration isolation section; 10. Subway tunnel; 11. Soil layer; 11a. Soft soil layer; 11b. Hard soil layer. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "bottom", "inner", "outer" and other terms used in this invention to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0021] It should be understood that the terms "first," "second," etc., are used in this invention to describe various types of information, but these terms are not limited to them; they are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figures 1 to 5 As shown, a preferred embodiment of the present invention provides an underground vibration isolation wall, comprising a wall 1, vibration isolation components 2, and fasteners 3. The wall 1 is located between a subway tunnel 10 and a basement 7, and is divided into multiple vibration isolation sections 9 along its height direction. Each vibration isolation section 9 corresponds to a soil layer 11 surrounding the wall 1. The vibration isolation components 2 are disposed on one or both sides of the wall 1 in each vibration isolation section 9. Each vibration isolation component 2 includes at least one rigid vibration isolation layer and at least one flexible vibration isolation layer. The rigid vibration isolation layer and the flexible vibration isolation layer are arranged alternately along the thickness direction of the wall 1. The rigid vibration isolation layer and the flexible vibration isolation layer are connected by multiple fasteners 3, and the fasteners 3 are fixedly connected to the wall 1.

[0024] The vibration isolation component 2 of this invention is composed of alternating rigid and flexible vibration isolation layers. A significant difference in wave impedance exists between the rigid and flexible layers. When vibration waves pass through the contact surface between the rigid and flexible layers, wave reflection, scattering, and attenuation occur, effectively attenuating the propagation energy of the vibration waves. Its vibration isolation effect is more efficient than relying on the damping and energy absorption of a single material. Furthermore, the vibration isolation layers are firmly connected to the wall 1 by fasteners 3, ensuring the integrity and stability of the entire composite vibration isolation system under long-term vibration conditions, preventing separation or misalignment between layers, and guaranteeing the stability of the vibration isolation wall.

[0025] Compared with traditional single-material or uniform-thickness vibration isolation layers, the embodiments of the present invention, through zonal design, can dynamically adjust the rigidity and flexibility configuration of the vibration isolation layer according to the wave impedance and vibration frequency characteristics of different soil layers. This allows for targeted design of the vibration isolation component 2, enabling the vibration isolation wall to meet the blocking requirements of high-frequency vibrations in hard soil layers while also adapting to the absorption requirements of low-frequency vibrations in soft soil layers. This significantly improves the comprehensive vibration isolation performance of the vibration isolation wall across the entire depth range, reduces the cumulative damage of vibration to the building structure, extends the service life of the building, and enhances safety. It solves the technical problem in the prior art where the vibration isolation layer material of underground vibration isolation walls is single and the thickness is constant, resulting in a uniform vibration isolation effect. This makes it impossible to isolate vibrations according to the vibration propagation characteristics and vibration isolation requirements of different soil layers, leading to poor vibration isolation performance of underground vibration isolation walls.

[0026] Furthermore, such as Figure 1As shown, soil layer 11 consists of three layers. The first and third soil layers are both soft soil layers 11a, and the second soil layer is a hard soil layer 11b. The subway tunnel 10 is located below the hard soil layer 11b. In order to attenuate the propagation of vibration waves, the underground vibration isolation wall of this embodiment is set between the subway tunnel 10 and the basement 7. The underground vibration isolation wall extends along the direction of the subway tunnel 10. The top of the underground vibration isolation wall extends to the ground. The bottom of the wall 1 is lower than the subway tunnel 10, and the vertical distance between the bottom of the wall 1 and the subway tunnel 10 is not less than 3m. Therefore, the bottom of the underground vibration isolation wall extends into the third soil layer.

[0027] Furthermore, such as Figure 1 and Figure 2 As shown, the vibration isolation section 9 includes at least one first vibration isolation section 91 opposite to the soft soil layer 11a and at least one second vibration isolation section 92 opposite to the hard soil layer 11b. In this embodiment of the invention, the vibration isolation section 9 is divided into three vibration isolation sections 9 according to the soil layer 11. From top to bottom, the first vibration isolation section 9 and the third vibration isolation section 9 are both the first vibration isolation section 91, and the second vibration isolation section 9 is the second vibration isolation section 92.

[0028] Furthermore, such as Figure 2 As shown, the vibration isolation component 2 includes a first vibration isolation component 2a disposed in the first vibration isolation section 91 and a second vibration isolation component 2b disposed in the second vibration isolation section 92. In this embodiment of the invention, the first vibration isolation component 2a is disposed on both sides of the inner wall 1 of the first vibration isolation section 91, and the second vibration isolation component 2b is disposed on both sides of the inner wall 1 of the second vibration isolation section 92. The first vibration isolation component 2a includes a first flexible vibration isolation layer 22a disposed on the wall 1, and a first rigid vibration isolation layer 21a disposed on the side of the first flexible vibration isolation layer 22a away from the wall 1. The first flexible vibration isolation layer 22a and the first rigid vibration isolation layer 21a are connected by fasteners 3. The second vibration isolation component 2b includes a second flexible vibration isolation layer 22b disposed on the wall 1, a second rigid vibration isolation layer 21b disposed on the side of the second flexible vibration isolation layer 22b away from the wall 1, and a third flexible vibration isolation layer 22c disposed on the side of the second rigid vibration isolation layer 21b away from the wall 1. The second flexible vibration isolation layer 22b, the second rigid vibration isolation layer 21b and the third flexible vibration isolation layer 22c are connected by fasteners 3. The flexible vibration isolation layer is a rubber layer or a PVC board, and the rigid vibration isolation layer is a steel plate. In this embodiment of the invention, the first flexible vibration isolation layer 22a, the second flexible vibration isolation layer 22b and the third flexible vibration isolation layer 22c are all made of PVC board, and the first rigid vibration isolation layer 21a and the second rigid vibration isolation layer 21b are both made of steel plate.

[0029] The first vibration isolation component 2a and the second vibration isolation component 2b of this embodiment are composed of alternating rigid and flexible vibration isolation layers. In the first vibration isolation component 2a, there are significant wave impedance differences between the first rigid vibration isolation layer 21a and the soft soil layer 11a, between the first rigid vibration isolation layer 21a and the first flexible vibration isolation layer 22a, and between the first flexible vibration isolation layer 22a and the wall 1. In the second vibration isolation component 2b, there are significant wave impedance differences between the third flexible vibration isolation layer 22c and the hard soil layer 11b, between the third flexible vibration isolation layer 22c and the second rigid vibration isolation layer 21b, between the second rigid vibration isolation layer 21b and the second flexible vibration isolation layer 22b, and between the second flexible vibration isolation layer 22b and the wall 1. When the vibration wave passes through the contact surface of each of the above layers, wave reflection, scattering and attenuation will occur. After passing through multiple impedance interfaces, the vibration wave is greatly reduced, effectively attenuating the energy of the vibration wave propagation. Its vibration isolation effect is more efficient than that of a single material relying on its own damping energy absorption.

[0030] Furthermore, such as Figure 3 and Figure 4 As shown, the underground vibration isolation wall also includes a reinforcing cage 5, in which concrete 52 is poured to form a wall 1. Fasteners 3 connecting the first vibration isolation component 2a and the second vibration isolation component 2b are both fixedly connected to the reinforcing cage 5. Specifically, in this embodiment of the invention, mounting holes are provided on the first flexible vibration isolation layer 22a, the second flexible vibration isolation layer 22b, the third flexible vibration isolation layer 22c, the first rigid vibration isolation layer 21a, and the second rigid vibration isolation layer 21b. Each fastener 3 includes a screw 31 inserted into the mounting hole. One end of the screw 31 is fixed to the first rigid vibration isolation layer 21a or the third flexible vibration isolation layer 22c. A limiting nut 33 is provided in the middle of the screw 31. The stop portion 32 of the screw 31 and the limiting nut 33 are used to position the first vibration isolation component 2a / second vibration isolation component 2b. The end of the screw 31 near the wall 1 is fixed to the reinforcing cage 5. The vibration isolation layer is firmly connected to the wall 1 by fastener 3, which ensures the integrity and stability of the entire composite vibration isolation system under long-term vibration environment, prevents the layers from separating or misaligning, and ensures the stability of the vibration isolation wall.

[0031] Furthermore, such as Figure 4As shown, to strengthen the connection between the fastener 3 and the reinforcing cage 5, the end of the screw 31 near the wall 1 overlaps the horizontal distribution bar 51 of the reinforcing cage 5. Two connectors 4 are fixedly connected to both sides of the screw 31, and the reinforcing cage 5 is fixedly connected to the two connectors 4. Specifically, the connector 4 includes a first plate 41 and a second plate 42 that are perpendicular to each other and fixedly connected. Along the extension direction of the wall 1, a second plate 42 is fixedly connected to both sides of the screw 31. The first plate 41, which is fixedly connected to each of the second plates 42, is fixedly connected to the reinforcing cage 5, and the right-angle openings of the two connectors 4 located on both sides of the screw 31 are oriented away from each other. In this embodiment of the invention, the connector 4 is made of L-shaped angle steel. The web of the L-shaped angle steel is welded and fixed to the reinforcing cage 5, and the flange of the L-shaped angle steel is welded and fixed to the side wall of the screw 31. The L-shaped angle steel increases the welding area of ​​the screw 31. The screw 31 and the reinforcing cage 5 are indirectly connected by the L-shaped angle steel, which improves the connection strength between the two. Moreover, the two L-shaped angle steels arranged at intervals also limit the screw 31, preventing the fastener 3 from moving along the horizontal distribution ribs 51 of the reinforcing cage 5.

[0032] Based on the underground vibration isolation wall of the above-described embodiments, this invention provides a construction method for an underground vibration isolation wall, comprising the following steps: S1. Construct the steel cage 5 of the wall 1, and fix each vibration isolation component 2 on the steel cage 5 to form the vibration isolation wall frame 8. S2. Excavate a trench to accommodate the vibration isolation wall frame 8; In step S2, the trenching process can be selected according to different geological conditions. In this embodiment of the invention, an excavator is used in conjunction with a trenching bucket for layered construction. In addition to considering the thickness of the wall 1, the width of the trench should also include the thickness of each vibration isolation component 2 and the construction error. S3. Lower the vibration isolation wall frame 8 into the trench; In step S3, when lifting the reinforcing cage 5, a crawler crane is first used to lift it horizontally, and then the reinforcing cage 5 is lowered into the trench. When lifting the reinforcing cage 5, it should be lowered slowly in the correct position to ensure that the reinforcing cage 5 does not deform.

[0033] S4. Pour concrete into the trench, and fill the reinforcing cage 5 with concrete. S5. Backfill the trench.

[0034] In summary, this invention provides an underground vibration isolation wall and its construction method. The vibration isolation component 2 is composed of alternating rigid and flexible vibration isolation layers. A significant difference in wave impedance exists between the rigid and flexible layers. When vibration waves pass through the contact surface between the rigid and flexible layers, wave reflection, scattering, and attenuation occur, effectively attenuating the propagation energy of the vibration waves. Its vibration isolation effect is more efficient than relying on the damping and energy absorption of a single material. Furthermore, the vibration isolation layers are firmly connected to the wall 1 using fasteners 3, ensuring the integrity and stability of the entire composite vibration isolation system under long-term vibration conditions, preventing separation or misalignment between layers, and guaranteeing the stability of the vibration isolation wall.

[0035] Compared with traditional single-material or uniform-thickness vibration isolation layers, the embodiments of the present invention, through zonal design, can dynamically adjust the rigidity and flexibility configuration of the vibration isolation layer according to the wave impedance and vibration frequency characteristics of different soil layers. This allows for targeted design of the vibration isolation component 2, enabling the vibration isolation wall to meet the blocking requirements of high-frequency vibrations in hard soil layers while also adapting to the absorption requirements of low-frequency vibrations in soft soil layers. This significantly improves the comprehensive vibration isolation performance of the vibration isolation wall across the entire depth range, reduces the cumulative damage of vibration to the building structure, extends the service life of the building, and enhances safety. It solves the technical problem in the prior art where the vibration isolation layer material of underground vibration isolation walls is single and the thickness is constant, resulting in a uniform vibration isolation effect. This makes it impossible to isolate vibrations according to the vibration propagation characteristics and vibration isolation requirements of different soil layers, leading to poor vibration isolation performance of underground vibration isolation walls.

[0036] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An underground vibration isolation wall, characterized in that, include: The wall (1) is located between the subway tunnel (10) and the basement (7); The wall (1) is divided into multiple vibration isolation sections (9) along its height direction, and each vibration isolation section (9) corresponds to a layer of soil (11) around the wall (1). Vibration isolation component (2), the vibration isolation component (2) is disposed on one or both sides of the wall (1) of each vibration isolation section (9); Each of the vibration isolation components (2) includes at least one rigid vibration isolation layer and at least one flexible vibration isolation layer, the rigid vibration isolation layer and the flexible vibration isolation layer are arranged alternately along the thickness direction of the wall (1), and the rigid vibration isolation layer and the flexible vibration isolation layer are connected by a plurality of fasteners (3); The fastener (3) is fixedly connected to the wall (1).

2. The underground vibration isolation wall according to claim 1, characterized in that, The vibration isolation section (9) includes at least one first vibration isolation section (91) opposite to the soft soil layer (11a) and at least one second vibration isolation section (92) opposite to the hard soil layer (11b). The vibration isolation component (2) includes a first vibration isolation component (2a) disposed in the first vibration isolation section (91) and a second vibration isolation component (2b) disposed in the second vibration isolation section (92). The first vibration isolation component (2a) includes a first flexible vibration isolation layer (22a) disposed on the wall (1) and a first rigid vibration isolation layer (21a) disposed on the side of the first flexible vibration isolation layer (22a) away from the wall (1), and the first flexible vibration isolation layer (22a) and the first rigid vibration isolation layer (21a) are connected by the fastener (3); The second vibration isolation component (2b) includes a second flexible vibration isolation layer (22b) disposed on the wall (1), a second rigid vibration isolation layer (21b) disposed on the side of the second flexible vibration isolation layer (22b) away from the wall (1), and a third flexible vibration isolation layer (22c) disposed on the side of the second rigid vibration isolation layer (21b) away from the wall (1). The second flexible vibration isolation layer (22b), the second rigid vibration isolation layer (21b) and the third flexible vibration isolation layer (22c) are connected by the fastener (3).

3. The underground vibration isolation wall according to claim 2, characterized in that, The underground vibration isolation wall also includes a steel cage (5), and concrete is poured inside the steel cage (5) to form the wall (1). The fastener (3) connecting the first vibration isolation component (2a) and the fastener (3) connecting the second vibration isolation component (2b) are both fixedly connected to the steel cage (5).

4. The underground vibration isolation wall according to claim 3, characterized in that, Mounting holes are provided on the first flexible vibration isolation layer (22a), the second flexible vibration isolation layer (22b), the third flexible vibration isolation layer (22c), the first rigid vibration isolation layer (21a), and the second rigid vibration isolation layer (21b); Each of the fasteners (3) includes a screw (31) inserted into the mounting hole. One end of the screw (31) is stopped and mounted on the first rigid vibration isolation layer (21a) or the third flexible vibration isolation layer (22c). A limit nut (33) is provided in the middle of the screw (31). The stop part (32) of the screw (31) and the limit nut (33) are used to position the first vibration isolation component (2a) / the second vibration isolation component (2b). The end of the screw (31) near the wall (1) is fixed to the steel cage (5).

5. The underground vibration isolation wall according to claim 4, characterized in that, The end of the screw (31) near the wall (1) is attached to the horizontal distribution bar (51) of the steel cage (5). Two connectors (4) are fixedly connected to both sides of the screw (31), and the steel cage (5) is fixedly connected to the two connectors (4).

6. The underground vibration isolation wall according to claim 5, characterized in that, The connector (4) includes a first plate (41) and a second plate (42) that are perpendicular to each other and fixedly connected. Along the extension direction of the wall (1), a second plate (42) is fixedly connected to each side of the screw (31). The first plate (41) that is fixedly connected to each second plate (42) is fixedly connected to the steel cage (5), and the right-angle openings of the two connectors (4) located on both sides of the screw (31) are oriented away from each other.

7. The underground vibration isolation wall according to claim 1, characterized in that, The bottom of the wall (1) is lower than the subway tunnel (10), and the vertical distance between the bottom of the wall (1) and the subway tunnel (10) is not less than 3m.

8. The underground vibration isolation wall according to claim 1, characterized in that, The flexible vibration isolation layer is a rubber layer or a PVC board, and the rigid vibration isolation layer is a steel plate.

9. A construction method for an underground vibration isolation wall, using the underground vibration isolation wall as described in any one of claims 3 to 6, characterized in that, Includes the following steps: S1. Make the steel cage (5) of the wall (1) and fix each vibration isolation component (2) on the steel cage (5) to form the vibration isolation wall frame (8). S2. Excavate a trench to accommodate the vibration isolation wall frame (8); S3. Lower the vibration isolation wall frame (8) into the trench; S4. Pour concrete into the trench, and fill the steel cage (5) with the concrete. S5. Backfill the trench.

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