Prefabricated track bed slab damping mat track bed

Abstract

The utility model relates to the field of vibration and noise control technology of rail transit, concretely relates to a prefabricated track bed slab damping pad track bed. The utility model discloses substrate filling layer, damping function layer and prefabricated track bed slab, the prefabricated track bed slab is erected with steel rail, and the damping function layer includes damping pad and placeholder elastic pad, the damping pad is strip or block, and the damping pad is set at the bottom surface of prefabricated track bed slab below the corresponding steel rail, and the rest surface of prefabricated track bed slab bottom is provided with placeholder elastic pad, and the surface stiffness of damping pad is higher than the surface stiffness of placeholder elastic pad. The utility model has the advantages of simple structure, more simple construction operation, faster construction speed, more easily controlled construction error, more guaranteed construction quality, good damping effect and more stable, high cost performance, can be widely applied to the floating track bed vibration isolation engineering of high speed railway, subway and other rail transit lines, and the market application prospect is very wide.

Description

Technical Field

[0001] This utility model relates to the field of vibration and noise control technology for rail transit, specifically to a prefabricated track bed slab vibration damping pad track bed. Background Technology

[0002] With social development and technological advancements, major cities are increasingly emphasizing the construction of urban rail transit, especially underground railways. However, an unavoidable problem in rail transit construction is the vibration and noise generated during vehicle operation. This vibration and noise not only affect residents' health but also negatively impact the comfort and structural safety of surrounding buildings. Therefore, installing floating slab track beds in densely populated residential areas is an important vibration isolation measure in subway track design. Common floating slab track beds include elastic pad floating slab track beds and steel spring floating slab track beds. Traditional vibration isolation floating slab track beds generally require pouring the foundation first, followed by pouring the track bed slab, involving two pouring and curing processes, resulting in a long construction cycle and high costs. In recent years, technicians have developed a precast track bed slab technology, such as Chinese Patent Publication No. CN106948227A, which discloses a slab-type easy-maintain vibration-damping pad track bed. The track bed slabs are prefabricated in a factory. By reducing the on-site maintenance of the track bed slabs, the construction cycle can be shortened, construction efficiency improved, and this technology has gained industry recognition. However, in practice, it has been found that the flatness of the pre-cast foundation often deviates, making height adjustment when used with precast slabs quite troublesome. This is especially true for curved sections, where the outer edge may be superelevated, resulting in a sloping foundation surface that makes construction errors even more difficult to control. In practice, significant errors sometimes occur, further complicating height adjustment and becoming a major obstacle to improving construction speed. Furthermore, existing elastic pad floating slab track bed technology uses polyurethane elastic foam pads or rubber vibration damping pads. For rubber vibration damping pads, they mainly 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. Existing precast slab vibration damping pads using polyurethane elastic foam pads are generally laid in a full-coverage manner, which can avoid the problem of foreign object entry and accumulation. However, for polyurethane elastic foam pads, their surface stiffness is closely related to the foaming rate. Surface stiffness, also known as the foundation modulus, is the vertical stiffness per unit area, and its unit is N / mm². 3The shape factor is closely related to the material's shape factor. The shape factor is the ratio of the area of ​​the pressure-bearing contact surface to the total free surface area of ​​the sides. A larger shape factor restricts lateral deformation, increases surface stiffness, raises the natural frequency, and reduces vibration damping. Therefore, the fully-laid polyurethane elastic foam pads in precast slab vibration-damping track beds have very high shape factors, often reaching 30, resulting in actual natural frequencies much higher than theoretical calculations and poorer vibration damping performance. Increasing the foaming rate to make the material softer fails to meet creep resistance and water absorption requirements, thus the problem of fully-laid vibration-damping pads remains unsolved, limiting the widespread application of this technology. Utility Model Content

[0003] The purpose of this invention is to solve the above problems and provide a precast track bed with vibration damping pads that allows for faster construction, easier control of engineering errors, and better vibration reduction. The present invention relates to a precast track slab vibration damping pad track bed, which is implemented as follows: it includes a base filling layer, a vibration damping functional layer, and a precast track slab. A steel rail is mounted on the precast track 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 set on the bottom surface of the precast track slab corresponding to the bottom of the steel rail. Spacer elastic pads are set on the remaining surface of the bottom surface of the precast track 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 location of the damping pad after the base filling layer has solidified, providing reliable horizontal restraint for the damping pad. Additionally, drainage ditches can be installed on the base filling layer on both sides of the precast track slab to meet drainage needs during daily operation.

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

[0006] This utility model of precast track slab vibration damping pad track bed may further include an isolation layer, which is disposed between the vibration damping functional layer and the base filling layer. The specific arrangement of the isolation layer is varied; for example, the isolation layer covers the bottom surface of the vibration damping functional layer; or, the isolation layer covers the bottom surface of the vibration damping functional layer and at least part of the side surface of the precast track slab; furthermore, the isolation layer may be made of a flexible film material, and the vibration damping pad and the spacer elastic pad are tightly bound to the precast track slab by heat shrinking or wrapping; additionally, the isolation layer may also be a precast rigid template, with a limiting groove on the precast rigid template corresponding to the vibration damping pad, and the vibration damping pad is disposed in the limiting groove. To facilitate separation of the isolation layer during later height adjustment or maintenance, preferably, the isolation layer is bonded to the precast track slab or fixedly connected by a detachable connection structure, wherein the detachable connection structure includes a fastener connection structure, a snap-fit ​​connection structure, or a rope connection structure. The isolation layer can be made of a variety of materials, including plastic sheet, non-woven fabric, thin metal sheet or engineering plastic sheet, etc., which can be selected according to the needs of the project. In addition, the molded rigid template can be prefabricated from fiber concrete or ultra-high performance concrete, or formed by stamping sheet metal from thin steel plate, or formed by molding or vacuum forming from materials such as fiberglass, acrylic sheet, PET, PVC, PS, etc.

[0007] To ensure the stability of the precast track slab vibration damping pad track bed structure of this utility model, limiting posts can be integrated into the base filling layer, and limiting holes or limiting grooves can be provided on the precast track slab corresponding to the limiting posts. In addition, for ease of construction, height-adjusting anchors for vertical height adjustment can be provided on the precast track slab; grouting through holes, and / or observation through holes, and / or hoisting connection structures can also be provided on the precast track slab, wherein the hoisting connection structure includes anchoring connectors or hoisting connection holes, and the grouting through holes and observation through holes are positioned to avoid the vibration damping pad.

[0008] In application, precast track slabs and vibration-damping layers can be pre-connected, then transported as a whole to the designated work site. After adjustment to the designed height, formwork is erected, and concrete or grout is poured into the gap formed by the formwork, vibration-damping layer, and foundation to form the base filling layer, which acts as the base. Because the precast track slabs are precisely adjusted in height on-site, and the base filling layer is poured in place, it ensures a tight fit between the base filling layer and the precast track slabs and vibration-damping layer, effectively reducing construction errors and significantly lowering construction difficulty, thus improving construction speed. After the isolation layer is added, it can separate the vibration damping functional layer from the base filling layer. On the one hand, it can prevent concrete or grout from entering the gap between the vibration damping pad and the spacer elastic pad during the pouring of the base filling layer, thus affecting the vibration damping effect of the vibration damping pad. On the other hand, during use, if it is necessary to replace the old vibration damping pad or replace it with other vibration damping pads of different vibration damping levels, the vibration damping pad can be easily installed and replaced after lifting the precast track slab, without the situation where the vibration damping pad is stuck to the base filling layer and cannot be removed. It is particularly noteworthy that during transportation and height adjustment, the vibration-damping functional layer can be pressed onto the surface of the precast track slab using an isolation layer. The vibration-damping pads and spacer elastic pads in the vibration-damping functional layer no longer need to be separately fixed to the precast track slab, reducing installation steps and further improving construction speed. Furthermore, the isolation layer, made of materials such as thin metal plates or engineering plastic plates, ensures the flatness of the base filling layer surface, preventing unevenness. Additionally, this invention offers another advantage: on the one hand, it overcomes the shortcomings of traditional full-lay vibration-damping pad solutions, such as high cost, difficulty in replacement, and limited effectiveness of the vibration-damping pads; on the other hand, it overcomes the disadvantage of traditional point-supported vibration-damping pad solutions, where the cavity formed by the vibration-damping pad and track slab easily accumulates and sediments, leading to a gradual decline in vibration-damping performance. Therefore, the vibration-damping effect of this precast track slab vibration-damping pad track bed is more stable and durable. It should be noted that in the precast track bed slab vibration damping pad track bed of this utility model, since the surface stiffness of the spacer elastic pad is much 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. Furthermore, 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 it is laid in blocks, its shape factor can be reduced to below 3. Lateral deformation is more free, its surface stiffness is greatly reduced, the actual natural frequency is closer to the theoretical calculation value, and the vibration damping effect is better.

[0009] In summary, the precast track bed vibration damping pad of this utility model has a simple structure, makes construction operations simpler and faster, makes construction errors easier to control, ensures better construction quality, and provides good and more stable vibration damping effect. It has a high cost performance and can be widely used in the vibration isolation project of floating track beds for rail transit lines such as high-speed rail and subway, with a very broad market application prospect. Attached Figure Description

[0010] Figure 1 This is one of the structural schematic diagrams of the prefabricated track bed slab vibration damping pad track bed of this utility model.

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

[0012] Figure 3 for Figure 1 BB cross-sectional view.

[0013] Figure 4 This is the second structural schematic diagram of the prefabricated track bed slab vibration damping pad track bed of this utility model.

[0014] Figure 5 This is the third schematic diagram of the prefabricated track bed slab vibration damping pad track bed of this utility model.

[0015] Figure 6 for Figure 5 CC section view.

[0016] Figure 7 for Figure 5 DD sectional view.

[0017] Figure 8 This is the fourth structural schematic diagram of the prefabricated track bed slab vibration damping pad track bed of this utility model.

[0018] Figure 9 This is the fifth schematic diagram of the prefabricated track bed slab vibration damping pad track bed of this utility model.

[0019] Figure 10 for Figure 9 EE sectional view.

[0020] Figure 11 for Figure 9 FF sectional view. Detailed Implementation

[0021] Example 1 like Figure 1 , Figure 2 and Figure 3The present invention relates to a precast track slab vibration damping pad track bed, comprising a base filling layer 1, a vibration damping functional layer, and a precast track slab 4. A steel rail 5 is mounted on the precast track 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 precast track slab 4, corresponding to the area below the steel rail 5. Spacer elastic pads 3 are positioned on the remaining surface of the bottom surface of the precast track slab 4. 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... The rigidity of the spacer elastic pad is twice that of the surface of the foundation 6; wherein, the base filling layer 1 is cast on the surface of the foundation 6 using concrete material, and drainage ditches 7 are provided on both sides of the precast track slab 4 on the base filling layer 1. In this example, the foundation 6 is specifically the tunnel wall; a limiting post 8 is integrally provided on the base filling layer 1, and a limiting hole 9 is provided on the precast track slab 4. In order to prevent the limiting post 8 from directly contacting the limiting hole 9 and causing collision damage, a buffer 10 is provided between the limiting post 8 and the limiting hole 9. The buffer 10 is made of elastic polyurethane material.

[0022] In application, vibration damping pads and spacer elastic pads are pre-attached and fixed to the bottom of the precast track slab, thus pre-connecting the precast track slab and vibration damping layer together. The entire assembly is then transported to the designated work station, adjusted to the designed height, and a formwork is erected. Concrete is then poured into the gap formed by the formwork, vibration damping layer, and foundation to form the base filling layer, which serves as the base. Because the precast track slab is precisely height-adjusted on-site, and the base filling layer is poured in situ, a tight fit between the base filling layer and the precast track slab and vibration damping layer is ensured. This effectively reduces construction errors, significantly lowers construction difficulty, and facilitates faster construction. In addition, this utility model has another advantage: on the one hand, it overcomes the shortcomings of traditional full-coverage vibration damping pads, such as high cost, difficulty in replacement, and insufficient vibration damping performance; on the other hand, it also overcomes the shortcomings of traditional point-supported vibration damping pads, such as the easy entry and deposition of foreign objects like mud and sand into the cavity formed by the vibration damping pad and the precast track slab, leading to a gradual decline in vibration damping performance. Therefore, the vibration damping effect of this utility model's precast track slab vibration damping pad track bed is more stable and durable. It should be particularly noted that in this utility model's precast track slab vibration damping pad track bed, because the surface stiffness of the occupier elastic pad is much 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. Furthermore, because the vibration damping pad is no longer fully covered 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.

[0023] In summary, the precast track bed slab vibration damping pad of this utility model has a simple structure, can be completed in one on-site pouring, makes the construction operation simpler, the construction speed faster, the construction error easier to control, and the construction quality more guaranteed. It has a high cost performance and can be widely used in the vibration isolation project of floating track bed of high-speed rail, subway and other rail transit lines. The market application prospects are very broad.

[0024] It should be noted that, in this utility model, the vibration damping pad can be made of materials other than rubber elastic pads, such as elastic polyurethane pads, and can also achieve good results; the spacer elastic pad can be made of foamed materials, rock wool materials, etc., as long as the pad body is compressible and its surface stiffness is significantly lower than that of the vibration damping pad, and can effectively prevent the intrusion of concrete materials in the base filling layer, providing a reliable elastic working height space for the vibration damping pad, it can be used in this utility model; in addition, the setting method of the limiting column on the base filling layer can also be varied. For example, in order to reduce on-site construction procedures, such as Figure 4 In the technical solution shown, the limiting post 8 can also be a precast component. During on-site construction, the limiting post 8 is positioned and then concrete is poured. After the concrete solidifies, the limiting post 8 is fixed in the base filling layer, achieving the same technical effect. Furthermore, the thickness of the vibration damping pad 2 is greater than the thickness of the spacer elastic pad 3. Thus, after the base filling layer 1 is poured and solidified, a limiting groove structure can be directly formed at the corresponding position of the vibration damping pad 2, providing reliable horizontal limiting for the vibration damping pad 2. Fourth, this example uses the case where the surface stiffness of the vibration damping pad 2 is twice that of the 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, it 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.

[0025] Example 2 like Figure 5 , Figure 6 and Figure 7The precast track slab vibration damping pad track bed of this utility model differs from Embodiment 1 in that the vibration damping pad 2 is block-shaped and arranged below the precast track slab corresponding to the rail. The precast track slab vibration damping pad track bed of this utility model also includes an isolation layer 12, which is disposed between the vibration damping functional layer and the base filling layer 1, and covers the bottom surface of the vibration damping functional layer. The isolation layer 12 is specifically made of plastic cloth. Furthermore, the precast track slab 4 is provided with four height adjustment anchors 11 for vertical height adjustment. 11 is provided with threaded connection holes; in addition, the precast track bed slab 4 is also provided with two observation through holes 13. The bottom sides of the observation through holes 13 are also provided with lifting reserved grooves 14. In this example, the observation through holes 13 also serve as grouting through holes when the base filling layer is poured on site. Correspondingly, through holes 15 for pouring concrete materials on site are provided on the occupant elastic pad 3 and the isolation layer 12 at the bottom of the observation through holes 13. It should be noted that the observation through holes 13 (i.e. grouting through holes) and through holes 15 should avoid the vibration damping pad 2.

[0026] In application, the difference from the construction method described in Example 1 is that after the vibration damping pad 2 and the spacer elastic pad 3 are pre-attached and fixed to the bottom of the precast track bed slab 4, the isolation layer 12 is attached to the outer surface of the vibration damping functional layer, and then the whole thing is transported to the designated work station. Using the threaded rod (not specifically shown in the figure) and the threaded connection hole in the height adjustment anchor 11, the precast track bed slab 4 is raised to the design height, the template is erected, and then concrete material is poured into the isolation layer 12 through the observation through hole 13 and through hole 15 and cured to form the base filling layer 1. After the concrete has solidified, the threaded rod is removed. To prevent the threaded rod from being fixed in the concrete material, grease can be applied to the surface of the threaded rod.

[0027] Compared with Embodiment 1, the advantages of the technical solution described in this example are that, with the addition of an isolation layer, the vibration damping functional layer can be separated from the base filling layer. On the one hand, this prevents concrete from entering the gap between the vibration damping pad and the spacer elastic pad during the pouring of the base filling layer, thus affecting the vibration damping effect of the vibration damping pad. On the other hand, during use, if it is necessary to replace worn-out vibration damping pads or other vibration damping pads of different vibration damping grades, a jack can be placed in the lifting reserved groove 14 at the bottom of the observation through hole 13. After lifting the precast track slab with the jack, the vibration damping pad can be easily installed and removed for replacement, without the vibration damping pad sticking to the base filling layer and becoming impossible to remove. It is particularly noteworthy that, during transportation and height adjustment, the vibration damping functional layer can be pressed onto the surface of the precast track slab using the isolation layer. The vibration damping pad and the spacer elastic pad in the vibration damping functional layer do not need to be separately fixed to the precast track slab, or only the spacer elastic pad needs to be fixedly connected to the precast track slab. This reduces installation steps, facilitates the replacement of vibration damping pads, and helps to further improve construction speed. For example, in this case, a flexible plastic film material can be used to form an isolation layer. The vibration damping pads and spacer elastic pads can be secured to the bottom surface of the precast track slab by padding or wrapping. Alternatively, the ends of the flexible film material can be glued and fixed to the sides of the precast track slab. In other words, the isolation layer covers the bottom surface of the vibration damping functional layer and part of the sides of the precast track slab, achieving a good technical effect and falling within the scope of protection claimed by this utility model. Furthermore, the technical solution described in this example uses block-shaped vibration damping pads. Laying them in blocks reduces their shape factor to below 3, allowing for greater freedom in lateral deformation. This significantly reduces surface stiffness, making the actual natural frequency closer to the theoretical calculation value, resulting in better vibration damping.

[0028] It should be noted that the base filling layer can be constructed using concrete or other materials such as grout, and the appropriate material can be selected according to the needs of the project. In addition, in this example, the observation through-hole and the grouting through-hole are achieved using the same through-hole. This technical solution can reduce the number of openings on the precast track slab, which is beneficial to ensuring the strength of the precast track slab and reducing the difficulty of processing the precast track slab. Of course, in practical applications, the observation through-hole and the grouting through-hole can also be set separately. Based on this principle, the height adjustment anchor 11 can also be used as a hoisting connection structure and connected to the lifting lug during hoisting. In addition, the isolation layer can be made of non-woven fabric or other materials besides plastic sheeting, which can also achieve similar technical effects and are all within the protection scope of this utility model.

[0029] Example 3 like Figure 8The difference between the precast track bed slab vibration damping pad track bed of this utility model and Embodiment 2 is that the isolation layer 12 is specifically composed of a precast rigid template made of thin iron plate. The precast rigid template is provided with a limiting groove, and the vibration damping pad 2 is set in the limiting groove. In addition, the precast rigid template has drainage ditch 7 folded directly on both sides.

[0030] It should be noted that through holes should also be reserved for the concrete pouring through holes of the precast rigid formwork. This will only be explained in words here, and no additional drawings will be provided. In addition, besides using precast rigid formwork made of thin iron plate as an isolation layer, precast rigid formwork can also be precast from fiber concrete or ultra-high performance concrete, or formed by stamping sheet metal from thin steel 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] Compared with Embodiment 2, the advantages of the technical solution described in this example are that the isolation layer made of materials such as metal thin plates or engineering plastic thin plates can be directly used as a lost template. When pouring the base filling layer, there is no need to set up a separate template, which greatly simplifies the on-site construction operation procedure and helps to significantly improve construction efficiency. In addition, it can also ensure the flatness of the base filling layer surface and avoid unevenness on the base filling layer surface, which helps to improve the quality of the project.

[0032] Example 4 like Figure 9 , Figure 10 and Figure 11 The precast track bed slab vibration damping pad of this utility model differs from Embodiment 3 in that a limiting post 8 is integrally set on the base filling layer 1, and limiting grooves 17 are respectively set at the ends of the precast track bed slab 4 along the longitudinal direction of the rail to cooperate with the limiting post 8. A buffer member 10 is also provided between the limiting post 8 and the limiting groove 17. The buffer member 10 is made of elastic rubber material. In addition, a hoisting connection structure is set on the precast track bed slab 4. The hoisting connection structure is specifically an anchoring connection member 16 integrally set with the precast track bed slab 4. In addition, the vibration damping functional layer is composed of the precast track bed slab 4. The bottom extends upwards, covering the side of the precast track slab 4. The vibration damping pad 2 extends between the base filling layer 1 and the side of the precast track slab 4, ensuring that the vibration of the precast track slab must be attenuated by the vibration damping pad before it is transmitted to the base filling layer. The isolation layer 12 is made of non-woven fabric and covers the bottom and two sides of the precast track slab 4. The vibration damping functional layer is fixed to the precast track slab through a detachable connection structure. The detachable connection structure is a fastener connection structure. Specifically, the end of the non-woven fabric is fixed to the top surface of the precast track slab 4 by fastening bolts 18.

[0033] Compared with Embodiment 3, the technical solution described in this example, because the vibration damping functional layer extends upward from the bottom of the precast track slab 4 and covers the side of the precast track slab 4, the precast track slab can be embedded in the base filling layer. On the one hand, under the same rail top height, it is beneficial to increase the thickness of the precast track slab, improve the vibration participation quality, and enhance the vibration damping effect. On the other hand, the limiting of the precast track slab is more reliable, which can reduce the load of the limiting column 8 or even replace the function of the limiting column 8, which is beneficial to reduce the size of the limiting column 8 or even eliminate the limiting column. In addition, the isolation layer and the precast track slab are fixedly connected by a detachable connection structure, making it more convenient and faster to disassemble the isolation layer when repairing or replacing the vibration damping pad.

[0034] It should be noted that the detachable connection structure described in this utility model, in addition to the fastener connection structure already mentioned, can also be a snap-fit ​​connection structure or a rope connection structure, etc.; in addition, the hoisting connection structure can also be a hoisting connection hole or other structures, in addition to using anchoring connectors. These are all simple variations based on the technical principle of this utility model, and are only described in words here without drawing pictures, and are all within the protection scope claimed by this utility model.

[0035] 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 precast track slab vibration damping pad track bed, comprising a base filling layer, a vibration damping functional layer, and a precast track slab, wherein steel rails are mounted on the precast track slab, 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 placed on the bottom surface of the precast track slab corresponding to the rail. Spacer elastic pads are placed on the remaining surface of the bottom surface of the precast track slab. The surface stiffness of the vibration damping pads is higher than that of the spacer elastic pads.

2. The precast track 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 precast track 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 precast track slab vibration damping pad track bed as described in claim 1, characterized in that, Drainage ditches are provided on the base filling layer on both sides of the precast track slab.

5. The precast track 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 precast track slab, covering at least part of the side surface of the precast track slab.

6. The precast track slab vibration damping pad track bed as described in claim 1 or 5, characterized in that, The precast track slab vibration damping pad track bed also includes an isolation layer, which is disposed between the vibration damping functional layer and the base filling layer.

7. The precast track slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer covers the bottom surface of the vibration damping functional layer.

8. The precast track slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer covers the bottom surface of the vibration damping functional layer and at least part of the sides of the precast track slab.

9. The precast track slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer is bonded to the precast track slab or fixedly connected by a detachable connection structure, which includes a fastener connection structure, a snap-fit ​​connection structure, or a rope connection structure.

10. The precast track slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer is made of a flexible film material, and the vibration damping pads and spacer elastic pads are bound to the precast track slab by heat shrinking or wrapping.

11. The precast track slab vibration damping pad track bed as described in claim 6, characterized in that, The isolation layer is a prefabricated rigid template, and 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.

12. The precast track slab vibration damping pad track bed as described in claim 1, characterized in that, The base filling layer is integrally provided with limiting posts, and the precast track slab is provided with limiting holes or limiting grooves corresponding to the limiting posts.

13. The precast track slab vibration damping pad track bed as described in claim 1, characterized in that, The precast track slab is equipped with height-adjusting anchors for vertical height adjustment.

14. The precast track slab vibration damping pad track bed as described in claim 1, characterized in that, The precast track slab is provided with grouting through holes, and / or observation through holes, and / or hoisting connection structures. The hoisting connection structures include anchoring connectors or hoisting connection holes. The grouting through holes and observation through holes are provided to avoid vibration damping pads.

15. The precast track slab vibration damping pad track bed as described in claim 1, characterized in that, The vibration damping pads and the spacer elastic pads are glued and fixed to the bottom surface of the precast track slab.

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