CN114687385A

CN114687385A - Periodic cushion layer of vibration reduction and isolation barrier of subway tunnel

Info

Publication number: CN114687385A
Application number: CN202210256831.XA
Authority: CN
Inventors: 袁宗浩; 郑钰钰; 孙宏磊; 蔡袁强; 史吏
Original assignee: Zhejiang University of Technology ZJUT
Current assignee: Zhejiang University of Technology ZJUT
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-07-01

Abstract

A subway tunnel vibration damping and isolation barrier periodic cushion comprises vibration isolation piles and vibration isolation and isolation periodic barrier cushions which are buried underground, wherein the vibration isolation and isolation periodic barrier cushion comprises rigid cushions and Triangular-level honeycomb cushions which are alternately arranged up and down, and the rigid cushions are composed of two layers of reinforced concrete layers and a concrete layer clamped between the two layers of reinforced concrete layers; the Triangular-level honeycomb cushion layer is made of a rubber material and has a Triangular-level honeycomb structure; one side of the vibration isolation and damping period barrier cushion layer close to the vibration wave propagation is provided with at least one row of vibration isolation piles, and each row of vibration isolation piles comprises a plurality of vibration isolation piles. The invention can effectively obstruct the influence caused by the vibration generated by the operation of the tunnel subway, greatly reduce the influence before the vibration influence reaches the building, and reduce the influence and loss of residents and the building.

Description

Periodic cushion layer of vibration reduction and isolation barrier of subway tunnel

Technical Field

The invention relates to the technical field of subway vibration reduction and isolation, in particular to a periodic cushion layer of a subway tunnel vibration reduction and isolation barrier.

Background

With the development of urbanization and the increase of population density, tunnel traffic is becoming an indispensable traffic mode in cities. Compared with other traffic in cities, the tunnel traffic has the advantages of large traffic volume, punctual arrival, land saving, high speed, safety, reliability and the like. The tunnel traffic brings convenience and development to big and small cities. However, with the increase of the speed per hour of the subway and the long-term use, the quality of life requirements of citizens are improved, and the environmental problems caused by the operation of the citizens are more and more prominent. Especially, under the condition that urban buildings are increasingly dense, the problems of vibration and noise pollution caused to surrounding building structures are more non-negligible.

The conventional vibration damping and isolating measures are roughly classified into three aspects, namely vibration damping from a vibration source (active vibration damping), vibration isolation of a wave propagation path (passive vibration isolation), and vibration isolation at a building structure (passive vibration isolation). The vibration reduction at the vibration source is to adopt a method on a running train and a track, for example, a vibration reduction fastener and a vibration isolator are used on the train, and a floating slab and the like are adopted on the track; the propagation path vibration isolation is to adopt vibration isolation measures on a vibration propagation path during traffic operation to prevent the vibration waves from propagating farther, such as coating vibration isolation materials on the surface of a lining, arranging vibration isolation piles, vibration isolation ditches and the like in soil mass; vibration isolation at building structures, i.e., vibration isolation measures are taken around the building to reduce the risk of vibration, such as sound absorbing walls and the like. Most of the current research is focused on taking measures from the tunnel, the propagation path, and relatively little research is done on the building structure (vibration receptor). Meanwhile, the vibration isolation trench of the tunnel device in a deep buried position is difficult to operate, and how to increase the vibration attenuation and vibration isolation effect is an important step for solving the environmental problem caused by subway vibration at the present stage.

At present, relevant scholars mostly apply honeycomb structure materials in the field of automobiles, high-quality honeycomb structures have the characteristics of light weight, high energy absorption, high stability force values and the like, and the honeycomb structure materials of composite materials as good energy absorption materials are not well developed in civil engineering.

Disclosure of Invention

In order to overcome the problems, the invention provides a periodic cushion layer of a subway tunnel vibration damping and isolating barrier, which is suitable for being used under a building.

The technical scheme adopted by the invention is as follows: a subway tunnel vibration damping and isolation barrier periodic cushion comprises vibration isolation piles and vibration isolation and isolation periodic barrier cushions which are buried underground, wherein the vibration isolation and isolation periodic barrier cushion comprises rigid cushions and Triangular-level honeycomb cushions which are alternately arranged up and down, and the rigid cushions are composed of two layers of reinforced concrete layers and a concrete layer clamped between the two layers of reinforced concrete layers; the Triangular-level honeycomb cushion is made of rubber materials, and has a Triangular-level honeycomb structure, wherein the level N is 2, and the side length ratio is 1/8; one side of the vibration isolation and damping period barrier cushion layer close to the vibration wave propagation is provided with at least one row of vibration isolation piles, and each row of vibration isolation piles comprises a plurality of vibration isolation piles.

Further, the vibration isolation piles and the vibration isolation and reduction period barrier cushion layer are arranged right below the vibrated building and are orthogonal to a propagation path of vibration waves generated by the subway tunnel.

Further, the thickness of the vibration isolation and damping period barrier cushion layer is 4.00-5.00m, and the length of the vibration isolation and damping period barrier cushion layer is larger than that of a vibrated building.

Further, the vibration isolation piles are C30 concrete piles.

The invention has the beneficial effects that:

1. the construction material is economic and environment-friendly, and causes little environmental pollution. Compared with a vibration damping ditch, the vibration isolation pile is more convenient to construct and convenient to construct at the distance of the existing subway tunnel.

2. The honeycomb structure in the vibration isolation material can effectively ensure the vibration damping and vibration isolation effect and has a certain effect on noise reduction;

3. the vibration isolation system is arranged between the subway tunnel structure and the building structure, so that the influence caused by vibration generated by the operation of the subway in the tunnel can be effectively isolated, the influence is greatly reduced before the vibration influence reaches the building, and the influence and loss of residents and the building are reduced;

4. the method is used for laying a new-stage building in the future, reduces subsequent influence caused by vibration of peripheral subway tunnels, and prevents the influence in the bud.

Drawings

Fig. 1 is a schematic view showing the arrangement of the vibration isolation barrier right under the building structure according to the present invention.

Fig. 2a is a schematic structural diagram of the Triangular layered honeycomb mat according to the present invention.

Fig. 2b is a partial enlarged view of a in fig. 2 a.

Fig. 3a is a schematic diagram of a cell in a Triangular hierarchical cell structure according to the present invention.

Fig. 3b is a schematic diagram of a hierarchical edge in the Triangular hierarchical honeycomb structure of the present invention.

Description of reference numerals: 1. urban underground traffic subways; 2. a tunnel; 3. a vibration isolation barrier cushion layer; 4. vibration isolation piles; 5. a building structure affected by vibration.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., appear based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the appearances of the terms "first," "second," and "third" are only used for descriptive purposes and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to the attached drawings, the periodic cushion of the vibration-damping and vibration-isolating barrier of the subway tunnel comprises vibration-isolating piles 4 and a periodic cushion of the vibration-isolating and vibration-isolating barrier 3 which are buried in a soil layer right below a building affected by vibration, wherein the vibration-isolating piles 4 and the periodic cushion of the vibration-isolating and vibration-isolating barrier 3 form a combined barrier in a non-continuous vibration-isolating barrier form; the length of the vibration isolation and damping period barrier cushion layer 3 is larger than that of the building, so that a good vibration isolation effect on the building is achieved. In this embodiment, the vibration source is an urban underground traffic subway 1, and the vibration receiver is a building structure 5 affected by vibration.

The vibration isolation and damping period barrier cushion layer 3 comprises three layers of rigid cushion layers 31 and two layers of Triangular level honeycomb cushion layers 32 which are alternately arranged up and down, wherein the rigid cushion layers 31 consist of two layers of reinforced concrete layers and concrete layers clamped between the two layers of reinforced concrete layers; the concrete layer is made of a new concrete material, and specifically comprises fly ash, a polyurethane composite material, ceramsite, rubber, cement and a foaming agent. The Triangular-level honeycomb cushion layer 32 is made of elastic rubber material; the total thickness of the vibration isolation and damping period barrier cushion layer 3 is 4.00-5.00 m.

The Triangular-level honeycomb mat 32 has a Triangular-level honeycomb structure, as shown in fig. 2a and b, which is a hierarchical honeycomb structure constructed by replacing the side length of the original hexagonal honeycomb with the edge with hierarchy on the basis of the conventional hexagonal honeycomb. In this embodiment, the level N is 2, the side length ratio is 1/8, and the level N is the number of complete hexagons on the side of the representative edge of the level honeycomb that is offset from the lateral symmetry axis. The side length ratio r refers to the ratio of the minimum side length in the hierarchical honeycomb to the length of the conventional hexagonal honeycomb, i.e., r is l_t/l₀In, l_tAnd l₀The specific locations indicated for the two parameters are shown in fig. 3a-b, which mainly affect the number of segments divided on average for the side length of a conventional honeycomb.

The side length ratio formula of the T-level honeycomb layer structure is defined as follows:

researches of scholars find that the honeycomb structure has excellent mechanical property, and the axial energy absorption capacity of the T-level honeycomb layer is 3 times of that of a conventional hexagonal honeycomb with the same thickness. Compared with the conventional hexagonal honeycomb structure, the single-mass energy absorption of the secondary-level honeycomb structure is improved by 186%. And the periodic structure is used as a technology applied to passively controlling the propagation of the vibration wave, and has the characteristics of good frequency dispersion characteristic and stability, obvious vibration and noise reduction effect and the like due to the specific structural advantages.

One side that vibration isolation damping cycle protective screen bed course 3 is close to the vibration wave propagation is equipped with at least one row of vibration isolation stake 4, and every row of vibration isolation stake 4 includes a plurality of vibration isolation stake 4, and vibration isolation stake 4 is C30 concrete pile, is used for realizing the vibration isolation effect of the vibration wave that closes on building structure. The vibration isolation piles 4 and the vibration isolation and reduction period barrier cushion 3 are arranged right below a target building and are orthogonal to a propagation path of vibration waves generated by the subway tunnel.

The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms set forth in the embodiments but rather by the equivalents thereof as may occur to those skilled in the art upon consideration of the present inventive concept.

Claims

1. The utility model provides a subway tunnel damping vibration isolation barrier cycle bed course which characterized in that: the vibration isolation and damping periodic barrier cushion comprises vibration isolation piles (4) and a vibration isolation and damping periodic barrier cushion (3) which are buried underground, wherein the vibration isolation and damping periodic barrier cushion (3) comprises rigid cushions (31) and Triangular-level honeycomb cushions (32) which are alternately arranged up and down, and the rigid cushion (31) consists of two layers of reinforced concrete layers and a concrete layer clamped between the two layers of reinforced concrete layers; the Triangular-level honeycomb cushion (32) is made of a rubber material, the Triangular-level honeycomb cushion (32) has a Triangular-level honeycomb structure, the level N is 2, and the side length ratio is 1/8; one side of the vibration isolation and damping period barrier cushion layer (3) close to the propagation of vibration waves is provided with at least one row of vibration isolation piles (4), and each row of vibration isolation piles (4) comprises a plurality of vibration isolation piles (4).

2. The vibration-damping and vibration-isolating barrier periodic cushion layer for the subway tunnel as claimed in claim 1, wherein: the vibration isolation piles (4) and the vibration isolation and reduction period barrier cushion layer (3) are arranged right below a vibrated building and are orthogonal to a propagation path of vibration waves generated by the subway tunnel.

3. The periodic cushion layer of the vibration-damping and vibration-isolating barrier of the subway tunnel as claimed in claim 2, wherein: the thickness of the vibration isolation and reduction period barrier cushion layer (3) is 4.00-5.00m, and the length of the vibration isolation and reduction period barrier cushion layer (3) is larger than that of a vibrated building.

4. The vibration-damping and vibration-isolating barrier periodic cushion layer for the subway tunnel as claimed in claim 1, wherein: the vibration isolation piles (4) are C30 concrete piles.