CN110761132A - An assembled vibration isolation barrier - Google Patents

Abstract

The invention relates to the technical field of vibration isolation and discloses an assembled vibration isolation barrier. The fabricated vibration isolation barrier includes a plurality of vibration isolation modules arranged side by side in a horizontal direction, the vibration isolation modules including a plurality of web portions arranged in layers in a vertical direction and a flange portion arranged above the topmost web portion , the web part and the flange part are both hollow structures, and the two adjacent web parts are detachably connected. The web parts are detachably connected, and the web parts and flange parts can be prefabricated in the workshop and connected and assembled on site, avoiding on-site production, shortening the on-site construction time of the vibration isolation barrier, and reducing the isolation The cost of the vibration barrier; at the same time, the web part and the flange part use a hollow structure, and the hollow structure makes the vibration isolation barrier form a cavity under the condition of ensuring the structural strength of the vibration isolation barrier, and the vibration isolation effect is close to that of the trench vibration isolation barrier. , which improves the vibration isolation effect while ensuring stability.

Description

An assembled vibration isolation barrier

technical field

The invention relates to the technical field of vibration isolation, in particular to an assembled vibration isolation barrier.

Background technique

Vibration in the built environment is generated by various sources, such as industrial machinery, road and rail traffic, and these vibrations can cause sensitive equipment to fail and cause nuisances to people, so different measures are required to mitigate vibrations. According to different vibration generation and propagation conditions, people can effectively reduce the vibration level by intervening at the vibration source; also can reduce the vibration wave amplitude by applying barriers on the vibration wave propagation path.

The principle of barrier vibration isolation is based on the reflection and scattering of wave energy. Two aspects, one is the dynamic stress concentration phenomenon around the barrier; the other is the transmission change laws of wave reflection, refraction and transmission caused by the existence of the barrier. The effect of vibration isolation is measured by the amount of transmitted energy. The smaller the transmitted energy, the better the vibration isolation effect.

Among the vibration isolation barriers, the vibration isolation effect of the hollow trench vibration isolation barrier is the most obvious. The hollow trench vibration isolation barrier is filled with materials such as bentonite, geotechnical materials, wood chips, and metal high-density materials; or special concrete pipe piles, concrete retaining walls and Reinforced concrete slabs form a barrier vibration isolation structure. In order to obtain materials with high impedance, air cushions are even used abroad to isolate vibrations caused by train loads. The vibration isolation air cushions are composed of internal air cushions, middle protective mud, and external protective walls. There is no filling inside the traditional hollow trench vibration isolation barrier, and its structural stability is not good. It is not suitable for use in densely built and soft soil environments. At the same time, the hollow trench vibration isolation barrier is constructed on site, but the on-site construction is inconvenient. , and in order to ensure stability, concrete walls need to be poured, which prolongs the construction period, increases costs, and is economical.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an assembled vibration isolation barrier to solve the problems of inconvenient construction and poor economy of the hollow trench vibration isolation barrier in the prior art.

In order to achieve the above object, the present invention provides an assembled vibration isolation barrier, comprising a plurality of vibration isolation modules arranged side by side in a horizontal direction, the vibration isolation modules comprising a plurality of web parts and an arrangement arranged in layers in a vertical direction The flange portion above the topmost web portion, the web portion and the flange portion are both hollow structures, and two adjacent web portions are detachably connected.

Preferably, two adjacent web parts are connected by bolts.

Preferably, the bolts are stud bolts, the threads at both ends of the stud bolts are rotated in opposite directions, and the top surface and the bottom surface of the web portion are respectively provided with bolt holes matched with the stud bolts.

Preferably, the dimensions of each web portion are the same.

Preferably, a connecting layer is filled between two adjacent vibration isolation modules.

Preferably, the connecting layer is a pouring layer filled with a mixture of gravel and cement.

Preferably, the flange portion has a flange extending horizontally beyond the web portion.

Preferably, the material of the web portion and the flange portion is concrete.

Compared with the prior art, an assembled vibration isolation barrier according to an embodiment of the present invention has the beneficial effect that a plurality of vibration isolation modules are arranged side by side in a horizontal direction, and each vibration isolation module includes a plurality of web parts and flange parts, and the web Detachable connection between plate parts, web part and flange part can be prefabricated in the workshop as prefabricated parts and connected and assembled on site, avoiding on-site fabrication, shortening the on-site construction time of the vibration isolation barrier, and reducing vibration isolation The cost of the barrier; at the same time, the web part and the flange part adopt a hollow structure, and the hollow structure makes the vibration isolation barrier form a cavity under the condition of ensuring the structural strength of the vibration isolation barrier, and the vibration isolation effect is close to that of the hollow trench vibration isolation barrier. The vibration isolation effect is improved while ensuring stability.

Description of drawings

Fig. 1 is the structural representation of the assembled vibration isolation barrier of the present invention;

Fig. 2 is the structural schematic diagram of the web part of the assembled vibration isolation barrier of Fig. 1;

Fig. 3 is the structural schematic diagram of the flange part of the assembled vibration isolation barrier of Fig. 1;

4 is an exploded schematic view of the web portion of the fabricated vibration isolation barrier of FIG. 1;

5 is a state diagram of the assembled vibration isolation barrier of the present invention when it is installed in a groove;

Fig. 6 is the state diagram after the assembled vibration isolation barrier of the present invention is installed into the groove;

Fig. 7 is the installation flow chart of the assembled vibration isolation barrier of the present invention;

8 is a schematic diagram of load action points and observation points of the assembled vibration isolation barrier of the present invention during numerical simulation;

Fig. 9 is the vibration isolation result diagram of the assembled vibration isolation barrier of the present invention in single-layer soft soil;

FIG. 10 is a graph showing the vibration isolation result of the assembled vibration isolation barrier of the present invention in a single layer of hard soil.

In the figure, 1, the web part; 11, the bolt hole; 2, the flange part; 21, the flange; 3, the perfusion layer; 4, the stud bolt; 5, the steel hook; 6, the groove.

Detailed ways

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are intended to illustrate the present invention, but not to limit the scope of the present invention.

A preferred embodiment of an assembled vibration isolation barrier of the present invention, as shown in FIG. 1 to FIG. 6 , the fabricated vibration isolation barrier is used to be arranged in a plurality of vibration isolation modules arranged in parallel, and the vibration isolation modules are arranged in a horizontal direction. Arranged side by side, a connecting layer is filled between two adjacent vibration isolation modules, the connecting layer is a pouring layer 3 filled with gravel and cement mixture, and the pouring layer 3 can be poured into the gap between two adjacent vibration isolation modules. After solidification, each vibration isolation module can be connected as a whole to increase the structural strength and stability of the assembled vibration isolation barrier, which is suitable for use in a dense building and soft soil environment.

The vibration isolation module includes a web portion 1 and a flange portion 2. There are multiple web portions 1 and are arranged in layers in the vertical direction. The flange portion 2 is arranged above the topmost web portion 1. The flange portion 2 has Horizontally beyond the flange 21 of the web part 1, the flange 21 can increase the width of the surface of the assembled barrier, effectively block the propagation of Rayleigh waves on the surface, thereby reducing the transmitted energy, thereby enhancing the vibration isolation effect.

The material of the web part 1 and the flange part 2 is concrete, and the structural strength of concrete is high. The web part 1 and the flange part 2 are both hollow structures. Therefore, the assembled vibration isolation barrier forms a cavity, and the vibration isolation effect is close to that of the trench vibration isolation barrier, which improves the vibration isolation effect while ensuring stability.

The dimensions of each web portion 1 are the same, so that each web portion 1 can be produced by the same mold, which reduces the cost of the mold, and at the same time, each web portion 1 can be replaced with each other, which reduces the difficulty of assembly. The two adjacent web parts 1 are connected by bolts, the bolts are stud bolts 4, and the threads at both ends of the stud bolts 4 are rotated in opposite directions.

The top surface and the bottom surface of the web portion 1 are respectively provided with bolt holes 11, and four bolt holes 11 adapted to the stud bolts 4 are reserved on the top surface and the bottom surface respectively, and the bolt holes 11 are threaded with the stud bolts 4. to connect two adjacent web parts 1. In other embodiments, the bolts connecting the two adjacent web parts 1 can also be ordinary bolts, and one end of the ordinary bolts is fixed in the web part 1; the two adjacent web parts 1 can also be connected by hooks and Hanging loop hook hook connection.

The assembled vibration isolation barrier of the present invention is shown in FIG. 7 during construction, and now a trench 6 is excavated on the bottom surface, and the trench 6 is excavated to the required depth, and a flange portion 2 is reserved on the top of the trench 6 Use stud bolts 4 to assemble each web part 1. After the web part 1 is assembled to the required depth, screw the bolt head with the bolt head in the bolt hole 11 of the top web part 1. Steel hook 5, the assembled web part 1 is hoisted into the groove 6 by a hoist, and after screwing out the steel hook 5, the flange part 2 is hoisted to the top of the web part 1 to form a vibration isolation module; The vibration isolation modules are sequentially assembled in the trench 6. After completion, two adjacent vibration isolation modules are filled with a mixture of gravel and cement to form a connection layer, and the arrangement of the assembled vibration isolation barrier is completed.

Through numerical simulation technology, the vibration isolation effect of the assembled vibration isolation barrier is simulated and analyzed, which specifically includes the following steps. The first step is to determine the overall geometric parameters of the model. Specifically, the effect of the assembled vibration isolation barrier is studied by ANSYS modeling and 2.5D finite element numerical analysis method using matlab software. Since the geometry of the model extends along the direction of the vibration isolation trench 6, the vibration isolation effect of the vibration isolation trench can be obtained by calculating the response of a certain section. The finite element model is established in the Cartesian coordinate system. The schematic diagram of the size of the finite element model is shown in Figure 8. The calculation plane is a rectangle, the plane size is 40m × 20m, the depth of the soil is 20m, and there are absorption boundaries around it, which are used to simulate the soil. the infinite domain problem.

In step 2, the geometrical, physical and mechanical parameters of the assembled vibration isolation barrier are determined. The total depth of the vibration isolation groove 6 is 8m, of which the flange part is 1m deep and the web part is 7m deep. The prefabricated module is made of C50 concrete, and its material parameters are: density of 2500kg/m3, Young's modulus of 34.5GPa, and Poisson's ratio of 0.1667.

The third step is to determine the geometric, physical and mechanical parameters of the soil layer. The soil layer is divided into two types: single-layer soft soil and single-layer hard soil.

For single-layer soft soil, the soil is relatively soft and is generally silty clay. The physical and mechanical parameters of the soil layer: the density is 1800kg/m3, the Young's modulus is 108MPa, and the Poisson's ratio is 0.33.

The single-layer hard soil is mainly sandy soil, the density is 2000kg/m3, the elastic modulus is 4.8GPa, and the Poisson's ratio is 0.33.

Step 4: Determine the excitation load. The vibration load of the train is analyzed and calculated by the 2.5DPML method, and the unit force is applied at the load application point to calculate the response of the receiving point under the action of the load frequency of 0-100Hz. As shown in Figure 8, the distance from the load acting point A to the center line of the fabricated vibration isolation barrier is 3m, and the distance from the observation point B to the center line of the fabricated vibration isolation barrier is also 3m.

Step 4: Determine the calculation result.

The attenuation decibel of the assembled vibration isolation barrier in a single layer of soft soil is shown in Figure 9. In Figure 9, the abscissa is the load frequency, and the ordinate is the attenuation decibel. It can be seen from the calculation results that the vibration isolation effect of the assembled vibration isolation barrier is very obvious. Under the medium and low load frequency of 0-45Hz, the vibration isolation effect increases with the increase of frequency, and the attenuation decibel also increases, up to 30dB; for 40Hz-100Hz high frequency load, the attenuation decibel decreases with the increase of frequency.

The attenuation decibel of the assembled vibration isolation barrier in a single layer of hard soil is shown in Figure 10. In Figure 10, the abscissa is the load frequency, and the ordinate is the attenuation decibel. It can be seen from the calculation results that the vibration isolation effect of the assembled vibration isolation barrier is lower than that in the soft soil; for the low frequency load component of 1Hz-10Hz, the corresponding attenuation in decibels is negative, which means that The assembled vibration isolation barrier cannot effectively isolate the train load in this frequency band; for the intermediate frequency component of 10Hz-50Hz, the corresponding attenuation decibel amount can reach 25dB; for the high-frequency component of 40Hz-100Hz, as the frequency increases, the attenuation decibel decreases. Small.

To sum up: the vibration isolation effect of the assembled vibration isolation barrier is better in soft soil, and its vibration isolation effect is reduced in hard soil.

To sum up, the embodiments of the present invention provide an assembled vibration isolation barrier, wherein a plurality of vibration isolation modules are arranged side by side in a horizontal direction, each vibration isolation module includes a plurality of web parts and flange parts, and the web parts are detachable Connection, web part and flange part can be made in advance as prefabricated parts in the workshop and connected and assembled on site, avoiding on-site production, shortening the on-site construction time of the vibration isolation barrier, and reducing the cost of the vibration isolation barrier; at the same time, the web The plate part and the flange part adopt a hollow structure. The hollow structure makes the vibration isolation barrier form a cavity under the condition of ensuring the structural strength of the vibration isolation barrier, and the vibration isolation effect is close to that of the trench vibration isolation barrier. Improved vibration isolation.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made. These improvements and replacements It should also be regarded as the protection scope of the present invention.

Claims (8)

1. An assembled vibration isolation barrier is characterized by comprising a plurality of vibration isolation modules which are arranged in parallel along the horizontal direction, wherein each vibration isolation module comprises a plurality of web parts which are arranged in a stacked mode along the vertical direction and a flange part which is arranged above the topmost web part, the web parts and the flange parts are both hollow structures, and every two adjacent web parts are detachably connected.

2. The fabricated vibration isolation barrier of claim 1, wherein adjacent web portions are connected by bolts.

3. The fabricated vibration isolation barrier according to claim 2, wherein the bolts are studs, the threads of the studs are oppositely threaded, and the top and bottom surfaces of the web portion are respectively provided with bolt holes for engaging with the studs.

4. The fabricated vibration isolation barrier of claim 1, wherein the web portions are the same size.

5. The fabricated vibration isolation barrier of any one of claims 1 to 4, wherein a connection layer is filled between two adjacent vibration isolation modules.

6. The fabricated vibration isolation barrier of claim 5, wherein the connection layer is a poured layer poured with a gravel and cement mixture.

7. The fabricated vibration isolation barrier of any one of claims 1-4, wherein the flange portion has a flange that extends horizontally beyond the web portion.

8. The fabricated vibration isolation barrier of any one of claims 1 to 4, wherein the web portions and the flange portions are made of concrete.

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