Cast-in-place floating slab damping mat track bed

Abstract

The utility model relates to rail transit vibration and noise control technical field, concretely relates to a cast-in-place floating slab damping pad ballast bed. The utility model discloses base, damping function layer and cast-in-place ballast bed slab, the steel rail is erected on the ballast bed slab, and the damping function layer includes damping pad and placeholder elastic pad, and the damping pad is strip or block, and the damping pad is set at the bottom surface of the ballast bed slab below corresponding steel rail, and the rest surface of the bottom surface of the ballast bed slab is provided with the placeholder elastic pad, and the surface stiffness of the damping pad is higher than the surface stiffness of the placeholder elastic pad. The utility model has the advantages of simple structure, overcomes the defects that the traditional technical scheme of full-paving damping pad is high in cost, difficult to replace, and the damping performance of damping pad is difficult to fully play, and the damping effect is good and more stable, and the cost performance is high, can be widely applied to the floating ballast bed vibration isolation engineering of high-speed rail, subway and other rail transit lines, and the market application prospect is very wide.

Description

Technical Field

[0001] This utility model belongs to the field of vibration and noise control in rail transit, and in particular relates to a floating plate vibration damping pad track bed for isolating wheel-rail vibration generated by the operation of rail vehicles. Background Technology

[0002] The wheel-rail vibration and noise generated during the operation of rail vehicles not only affect the health of residents, but also have an adverse impact on the comfort and structural safety of surrounding buildings. At present, floating track bed technology is the main measure to control wheel-rail vibration and noise. Existing floating slab vibration damping pad track bed technology, such as the cast-in-place floating slab with isolation membrane with Chinese patent authorization announcement number CN212247689U, mainly adopts the arrangement of full-coverage vibration damping pads, which are polyurethane elastic foam pads or rubber vibration damping pads. For rubber vibration damping pads, the main method is to rely on arrayed local elastic protrusions to provide elastic support for the track slab and achieve vibration damping. However, during use, foreign objects such as mud and sand can easily enter the gaps between the elastic protrusions. Accumulation of these foreign objects restricts the deformation space of the elastic protrusions, thus affecting the vibration damping effect. While floating slab vibration damping pads fully covered with polyurethane elastic foam pads can avoid the problem of foreign object entry and accumulation, the surface stiffness of polyurethane elastic foam pads is closely related to the foaming rate. Surface stiffness, also known as the foundation modulus, is the vertical stiffness per unit area, measured in N / mm³, and is closely related to the shape factor. The shape factor is the ratio of the area of ​​the pressure contact surface to the total free surface area of ​​the sides. The larger the shape factor, the more restricted the lateral deformation of the material, the greater the surface stiffness, the higher the natural frequency, and the worse the vibration damping effect. Therefore, the shape factor of fully covered polyurethane elastic foam pads in vibration damping pad tracks is very high, often reaching 30, and the actual natural frequency is much higher than the theoretical calculation, resulting in a poorer vibration damping effect than the theoretical calculation value. If the foaming rate is increased to make the material softer, the creep performance and water absorption rate will not meet the requirements, so the problem of full-coverage vibration damping pads has not been solved. On the other hand, full-coverage vibration damping pads require a large number of damping pads, which consumes a lot of materials and has high construction costs, which also limits the promotion and application of this technology. Utility Model Content

[0003] The purpose of this invention is to solve the above problems and provide a cast-in-place floating slab vibration damping pad track bed that is low in cost, has better and more durable vibration damping effect. The present invention relates to a cast-in-place floating slab vibration damping pad track bed, which includes a base, a vibration damping functional layer, and a cast-in-place track bed slab. A steel rail is mounted on the track bed slab. The vibration damping functional layer includes vibration damping pads and spacer elastic pads. The vibration damping pads are strip-shaped or block-shaped. The vibration damping pads are positioned on the bottom surface of the track bed slab below the steel rails. Spacer elastic pads are positioned on the remaining surface of the bottom surface of the track bed slab. The surface stiffness of the vibration damping pads is higher than that of the spacer elastic pads.

[0004] To avoid the spacer pad providing excessive stiffness and affecting the vibration damping performance of the damping pad, the surface stiffness of the damping pad should be at least twice that of the spacer pad. Furthermore, the thickness of the damping pad can be greater than that of the spacer pad. This allows a limiting groove structure to be directly formed at the corresponding position of the damping pad after the track slab has been poured and solidified, providing reliable horizontal restraint for the damping pad.

[0005] Depending on the project requirements, the vibration damping layer can extend upwards from the bottom of the track slab, at least covering part of the side of the track slab. For ease of transportation and construction, vibration damping pads and spacer elastic pads can also be glued and fixed to the base surface.

[0006] This utility model of cast-in-place floating slab vibration damping pad track bed may further include an isolation layer, which is disposed between the vibration damping functional layer and the track bed slab. The isolation layer at least covers the upper surface of the vibration damping functional layer. Of course, the specific arrangement of the isolation layer is diverse. For example, the isolation layer may extend along with the vibration damping functional layer to at least a portion of the side of the track bed slab. In addition, the isolation layer may be made of flexible film material or prefabricated rigid template. If necessary, limiting grooves may be set on the prefabricated rigid template corresponding to the vibration damping pads, and the vibration damping pads may be disposed in the limiting grooves. The isolation layer may be made of various materials, including plastic sheeting, non-woven fabric, etc., which can be selected according to project needs. In addition, the prefabricated rigid template may be prefabricated from fiber concrete or ultra-high performance concrete, or formed by stamping sheet metal from thin steel plates, or formed by molding or vacuum forming from materials such as fiberglass, acrylic sheet, PET, PVC, PS, etc.

[0007] This utility model of cast-in-place floating slab vibration damping pad track bed can also be equipped with drainage ditches on the base. Drainage ditches are also provided on the base filling layer on both sides of the precast track bed slab to meet the drainage needs during daily use. In addition, observation through holes can be provided on the track bed slab, and lifting grooves are provided on both sides of the bottom of the observation through holes. By using jacks in conjunction with the lifting grooves, the track bed slab can be easily lifted, and the vibration damping pads can be replaced from both sides of the track bed slab.

[0008] In application, the vibration-damping functional layer can be pre-placed at a designated location on the foundation, a template can be erected, and then the track slab can be poured on-site. After the concrete reaches its strength, the template can be removed and curing completed, thus obtaining the cast-in-place floating slab vibration-damping pad track bed of this utility model. This utility model of cast-in-place floating slab vibration-damping pad track bed significantly reduces the material usage of the vibration-damping pads due to the use of strip-shaped or block-shaped vibration-damping pads. Since the spacer elastic pads can be made of materials such as foam or rock wool, which are much cheaper than the vibration-damping pads, this helps to significantly reduce the project cost. With the addition of an isolation layer, the vibration-damping functional layer can be separated from the track slab. On the one hand, this prevents concrete from entering the gap between the vibration-damping pads and the spacer elastic pads during the on-site pouring of the track slab, thus affecting the vibration-damping effect of the pads. On the other hand, during use, if it is necessary to replace worn-out vibration-damping pads or to replace them with other vibration-damping pads of different vibration-damping levels, the vibration-damping pads can be easily removed after lifting the track slab, without the vibration-damping pads sticking to the track slab and becoming impossible to remove. Furthermore, this utility model's technical solution, by adding a spacer elastic pad to the vibration-damping functional layer, overcomes the shortcomings of traditional point-supported vibration-damping pad solutions, where foreign matter such as mud and sand easily enters and accumulates in the cavity formed by the vibration-damping pad and the track slab, leading to a gradual decline in vibration-damping performance. Therefore, the vibration-damping effect of this utility model's cast-in-place floating slab vibration-damping pad track bed is more stable and durable. It is particularly noteworthy that in this utility model's cast-in-place floating slab vibration-damping pad track bed, because the surface stiffness of the spacer elastic pad is significantly lower than that of the vibration-damping pad, the stiffness of the vibration isolation system is mainly controlled by the surface stiffness of the vibration-damping pad. Moreover, since the vibration-damping pad is no longer fully laid but laid in strips, its shape factor can be reduced to between 2 and 6; if laid in blocks, its shape factor can be reduced to below 3, allowing for greater freedom in lateral deformation. Its surface stiffness is significantly reduced, and the actual natural frequency is closer to the theoretical calculation value, resulting in better vibration-damping effect.

[0009] In summary, the structure of the cast-in-place floating slab vibration damping pad track bed of this utility model is simple, overcoming the shortcomings of the traditional full-lay vibration damping pad technology, which is high-cost, difficult to replace, and unable to fully utilize the vibration damping performance. It has a good vibration damping effect and is more stable, with high cost performance. It can be widely used in the vibration isolation project of floating track bed for rail transit lines such as high-speed rail and subway, and has a very broad market application prospect. Attached Figure Description

[0010] Figure 1 This is one of the structural schematic diagrams of the cast-in-place floating slab vibration damping pad track bed of this utility model.

[0011] Figure 2 for Figure 1 AA sectional view.

[0012] Figure 3 This is the second structural schematic diagram of the cast-in-place floating slab vibration damping pad track bed of this utility model.

[0013] Figure 4 This is the third structural schematic diagram of the cast-in-place floating slab vibration damping pad track bed of this utility model.

[0014] Figure 5 This is the fourth structural schematic diagram of the cast-in-place floating slab vibration damping pad track bed of this utility model.

[0015] Figure 6 for Figure 5 BB cross-sectional view.

[0016] Figure 7 for Figure 5 CC section view.

[0017] Figure 8 This is the fifth structural schematic diagram of the cast-in-place floating slab vibration damping pad track bed of this utility model.

[0018] Figure 9 for Figure 8 DD sectional view. Detailed Implementation

[0019] Example 1 like Figure 1 and Figure 2 The present invention relates to a cast-in-place floating slab vibration-damping track bed, comprising a base 1, a vibration-damping functional layer, and a cast-in-place track bed slab 4. A steel rail 5 is mounted on the track bed slab 4. The vibration-damping functional layer includes vibration-damping pads 2 and spacer elastic pads 3. Specifically, the vibration-damping pads 2 are strip-shaped rubber elastic pads of uniform thickness. The vibration-damping pads 2 are positioned on the bottom surface of the track bed slab 4, corresponding to the area below the steel rail. Spacer elastic pads 3 are positioned on the remaining surface of the bottom surface of the track bed slab 4, except for the vibration-damping pads. The surface stiffness of the spacer elastic pads 3 is lower than that of the vibration-damping pads 2; specifically, the surface stiffness of the vibration-damping pads 2 is twice that of the spacer elastic pads 3. The base 1 is cast in situ using concrete material on the surface of a foundation 6. Drainage ditches 7 are also provided on the base 1 corresponding to both sides of the track bed slab 4. In this example, the foundation 6 is specifically a tunnel wall.

[0020] In application, a base 1 is poured with concrete on the surface of foundation 6 until the concrete solidifies and is cured. Vibration damping pads 2 and spacer elastic pads 3 are placed on the base 1 according to the design drawings, forming the vibration damping functional layer. A template is erected above the vibration damping functional layer, and the track slab 4 is poured with concrete on-site. After the concrete reaches its strength, the template is removed and curing is completed, thus obtaining the cast-in-place floating slab vibration damping pad track bed of this utility model. This utility model of cast-in-place floating slab vibration damping pad track bed significantly reduces the amount of vibration damping pad material used due to the strip-shaped arrangement of the vibration damping pads. Since the spacer elastic pads can be made of materials such as foamed materials or rock wool, which are much cheaper than the vibration damping pads, it helps to significantly reduce the project cost. Furthermore, this utility model's technical solution, by adding a spacer elastic pad to the vibration-damping functional layer, overcomes the shortcomings of traditional point-supported vibration-damping pad solutions, where foreign matter such as mud and sand easily enters and accumulates in the cavity formed by the vibration-damping pad and the track slab, leading to a gradual decline in vibration-damping performance. Therefore, the vibration-damping effect of this utility model's cast-in-place floating slab vibration-damping pad track bed is more stable and durable. It is particularly noteworthy that in this utility model's cast-in-place floating slab vibration-damping pad track bed, because the surface stiffness of the spacer elastic pad is significantly lower than that of the vibration-damping pad, the stiffness of the vibration isolation system is mainly controlled by the surface stiffness of the vibration-damping pad. Moreover, since the vibration-damping pad is no longer fully laid but laid in strips, its shape factor can be reduced to between 2 and 6, allowing for more free lateral deformation. Its surface stiffness is greatly reduced, and the actual natural frequency is closer to the theoretical calculation value, resulting in better vibration-damping effect.

[0021] In summary, the structure of the cast-in-place floating slab vibration damping pad track bed of this utility model is simple, overcoming the shortcomings of the traditional full-lay vibration damping pad technology, which is high-cost, difficult to replace, and unable to fully utilize the vibration damping performance. It has a good vibration damping effect and is more stable, with high cost performance. It can be widely used in the vibration isolation project of floating track bed for rail transit lines such as high-speed rail and subway, and has a very broad market application prospect.

[0022] It should be noted that, in this utility model, in addition to rubber elastic pads, vibration damping pads made of other materials such as elastic polyurethane pads can also be used, achieving good results. The spacer elastic pad can be made of foamed materials, rock wool, etc., as long as the pad body is compressible and its surface stiffness is significantly lower than that of the vibration damping pad, effectively preventing the intrusion of concrete material from the base filling layer and providing a reliable elastic working height space for the vibration damping pad. Such pads can be used in this utility model and achieve good technical results. In this example, the surface stiffness of vibration damping pad 2 is twice that of spacer elastic pad 3. In practice, depending on the different vibration damping performance requirements, the surface stiffness of the vibration damping pad can be three, four, or even more times that of the spacer elastic pad. As long as excessive stiffness provided by the spacer elastic pad can be avoided from affecting the normal vibration damping performance of the vibration damping pad, such pads can be applied to this utility model. All the above technical solutions are simple variations based on the technical principles of this utility model and are within the protection scope claimed by this utility model.

[0023] Example 2 like Figure 3 The difference between the cast-in-place floating slab vibration damping pad track bed shown in this utility model and Embodiment 1 is that, in the vibration damping functional layer, the thickness of the vibration damping pad 2 is greater than the thickness of the spacer elastic pad 3, and the vibration damping pad 2 and the spacer elastic pad 3 are glued and fixed to the surface of the base 1.

[0024] In the technical solution described in this example, the vibration damping pad 2 and the spacer elastic pad 3 are pasted and fixed to the surface of the base 1 in advance. When the template is built and the track bed slab is poured on site in the later stage, the vibration damping pad and the spacer elastic pad are not easy to shift. Furthermore, since the thickness of the vibration damping pad 2 is greater than the thickness of the spacer elastic pad 3, when the track bed slab 4 is poured and solidified on site, a limiting groove structure can be directly formed at the bottom of the track bed slab at the position corresponding to the spacer elastic pad 3, providing reliable horizontal limiting for the vibration damping pad 2.

[0025] Example 3 like Figure 4 The difference between the cast-in-place floating slab vibration damping pad track bed shown in the present invention and Embodiment 2 is that the vibration damping pad 2 and the spacer elastic pad 3 are placed directly on the surface of the base 1; in addition, an isolation layer 8 is added, which is set between the vibration damping functional layer and the track bed slab 4, and the isolation layer 8 covers the upper surface of the vibration damping functional layer. The isolation layer is made of a flexible film material, specifically, it is made of a plastic film material.

[0026] Compared with Embodiment 2, the technical solution described in this example adds an isolation layer, which separates the vibration damping functional layer from the track slab. On the one hand, this prevents concrete from entering the gap between the vibration damping pad and the spacer elastic pad during the on-site pouring of the track slab, thus affecting the vibration damping effect of the vibration damping pad. On the other hand, it also effectively protects the vibration damping pad from damage by external objects. Thirdly, during use, if it is necessary to replace worn-out vibration damping pads or other vibration damping pads of different vibration damping levels, the vibration damping pads can be easily installed and replaced after lifting the track slab, without the situation where the vibration damping pads are stuck to the track slab and cannot be removed.

[0027] Of course, based on the technical principle of this example, in addition to plastic sheeting, non-woven fabric and other materials can also be used to make the flexible film material constituting the isolation layer, which can achieve similar technical effects and are all within the protection scope of this utility model.

[0028] Example 4 like Figure 5 , Figure 6 and Figure 7 The difference between the cast-in-place floating slab vibration damping pad track bed shown in this utility model and Embodiment 3 is that the vibration damping pad 2 is block-shaped and arranged below the track bed slab 4 corresponding to the rail. The base 1 is also provided with limiting grooves corresponding to the vibration damping pad 2, and the vibration damping pad is placed in the limiting grooves. The isolation layer 8 is composed of prefabricated rigid templates, specifically made of thin color steel plates. Corresponding to the limiting grooves on the base 1, the prefabricated rigid templates are also provided with limiting grooves. The upper and lower parts of the vibration damping pad 2 are respectively placed in the limiting grooves. In addition, the prefabricated rigid templates are directly folded into the shape of drainage ditches 7 on both sides. Furthermore, the cast-in-place track bed slab 4 is provided with observation through holes 9, and the bottom of the observation through holes 9 is also provided with lifting reserved grooves 10 on both sides.

[0029] Compared with the technical solution described in Embodiment 3, the technical solution described in this example, because the isolation layer uses a prefabricated rigid template, can completely separate the vibration damping functional layer from the track bed slab and ensure the flatness of the bottom surface of the track bed slab, which can better protect the vibration damping functional layer and help maintain the long-term stability of the system's vibration damping performance. In application, the prefabricated rigid template of the isolation layer can be used as a lost template, and even the drainage ditch can be formed in one go, which is very convenient and helps to further improve the construction speed. On the other hand, since observation through holes and lifting reserved grooves are added to the track bed slab, the track bed slab can be easily lifted through the observation through holes and with the cooperation of jacks and lifting reserved grooves. The vibration damping pads can be replaced from both sides of the track bed slab, which is convenient and quick. The replacement of vibration damping pads can be completed during the operation window, which not only greatly facilitates the daily maintenance of vibration damping pads, but also makes the vibration damping effect level of the cast-in-place floating slab vibration damping pad track bed of this utility model possible to be achieved at any time by replacing vibration damping pads with different performance, and its applicability is also significantly improved. In addition, the technical solution described in this example uses block-shaped vibration damping pads. By laying them in blocks, their shape factor can be reduced to below 3, allowing for more free lateral deformation. Their surface stiffness is greatly reduced, and their actual natural frequency is closer to the theoretical calculation value, resulting in better vibration damping effect.

[0030] It should be noted that, based on the technical principle of this example, in addition to using a prefabricated rigid template made of thin color steel plate as an isolation layer, the prefabricated rigid template can also be prefabricated from fiber concrete or ultra-high performance concrete, or formed by stamping sheet metal from thin iron plate, or formed by molding or vacuum forming from materials such as fiberglass, acrylic sheet, PET, PVC, and PS. All of these can be used as the isolation layer in this utility model. They are all simple variations based on the technical principle of this utility model and are all within the protection scope claimed by this utility model.

[0031] Example 5 like Figure 8 and Figure 9 The difference between the cast-in-place floating slab vibration damping pad track bed shown in this utility model and Embodiment 4 is that the vibration damping functional layer extends upward from the bottom of the track bed slab 4, covering part of the side of the track bed slab 4, and block-shaped vibration damping pads are also provided on the side of the track bed slab 4 to ensure that the vibration of the track bed slab must be attenuated by the vibration damping pads before it is transmitted to the base. The isolation layer 8 is made of non-woven fabric; drainage ditches are respectively provided on the base 1 corresponding to both sides of the track bed slab 4.

[0032] Compared with Embodiment 4, the technical solution described in this example has the following advantages: since the vibration damping functional layer extends upward from the bottom of the track bed slab 4 and covers a portion of the side of the track bed slab 4, the track bed slab can be embedded in the base. On the one hand, under the same rail top height, this is beneficial to increase the thickness of the track bed slab, improve the vibration participation quality, and enhance the vibration damping effect; on the other hand, the limiting of the track bed slab is more reliable and the stability is better.

[0033] Of course, based on the technical principles of this example, the vibration damping pads in the technical solutions described in this example or in the technical solutions shown in Embodiment 4 can also be arranged in strips, which can also achieve good technical effects. Correspondingly, in the technical solutions shown in Embodiments 1 to 3, the vibration damping pads can also be arranged in blocks, which can also achieve good technical effects. Here, only the text is used to describe them, and no drawings are attached. They are all within the protection scope of this utility model.

[0034] The embodiments of this utility model are mainly for the purpose of facilitating the understanding of the technical principles of this utility model, and are not limited to the contents described in the above embodiments. The technical contents described in the above embodiments can also be used interchangeably. Based on the technical principles of this utility model, those skilled in the art can recombine the technical solutions described in the above embodiments or use similar technologies to simply replace some of the components. As long as they are based on the technical principles of this utility model, they are all within the protection scope claimed by this utility model.

Claims

1. A cast-in-place floating slab vibration damping track bed, comprising a base, a vibration damping function layer and a cast-in-place track slab on which a steel rail is arranged, characterized in that, The vibration damping functional layer includes vibration damping pads and spacer elastic pads. The vibration damping pads are strip-shaped or block-shaped. The vibration damping pads are set on the bottom surface of the track bed slab corresponding to the rail. Spacer elastic pads are set on the remaining surface of the bottom surface of the track bed slab. The surface stiffness of the vibration damping pads is higher than that of the spacer elastic pads.

2. The cast-in-place floating slab vibration damping pad track bed as described in claim 1, characterized in that, The surface stiffness of the vibration damping pad is at least twice that of the surface stiffness of the occupant elastic pad.

3. The cast-in-place floating slab vibration damping pad track bed as described in claim 1, characterized in that, The thickness of the damping pad is greater than the thickness of the spacer elastic pad.

4. The cast-in-place floating slab vibration damping pad track bed as described in claim 1, characterized in that, The vibration damping layer extends upward from the bottom of the track slab, covering at least part of the side of the track slab, and the side is also provided with strip-shaped or block-shaped vibration damping pads.

5. The cast-in-place floating slab vibration damping pad track bed as described in claim 1, characterized in that, The vibration damping pad and the spacer elastic pad are adhered and fixed to the base surface.

6. The cast-in-place floating slab vibration damping pad track bed as described in claim 1 or 5, characterized in that, The cast-in-place floating slab vibration damping pad track bed also includes an isolation layer, which is disposed between the vibration damping functional layer and the track bed slab, and the isolation layer at least covers the upper surface of the vibration damping functional layer.

7. The cast-in-place floating slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer extends along with the vibration damping layer to at least a portion of the side surface of the track slab.

8. The cast-in-place floating slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer is made of flexible film material or pre-formed rigid template.

9. The cast-in-place floating slab vibration damping pad track bed as described in claim 8, characterized in that, The prefabricated rigid template has a limiting groove corresponding to the vibration damping pad, and the vibration damping pad is set in the limiting groove.

10. The cast-in-place floating slab vibration damping pad track bed as described in claim 1, characterized in that, Drainage ditches are provided on the base, and the drainage ditches are respectively located on both sides of the track bed slab.

11. The cast-in-place floating slab vibration damping pad track bed as described in claim 1, characterized in that, The track bed is provided with observation through holes, and there are also lifting reserved grooves on both sides of the bottom of the observation through holes.

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