Assembly type longitudinal superposed beam sleeper vibration reduction system

Abstract

The invention discloses an assembly type longitudinal superposed beam sleeper vibration reduction system, and belongs to the technical field of rail transit, the assembly type longitudinal superposed beam sleeper vibration reduction system comprises a longitudinal sleeper, a transverse connecting piece and an elastic vibration reduction component, the longitudinal sleeper is of a superposed beam structure and comprises an upper beam and a lower beam, and a damping layer is arranged on a middle interface of the upper beam and the lower beam; the transverse connecting piece is transversely connected between the two longitudinal sleepers, and the elastic vibration reduction parts are arranged at the bottoms of the longitudinal sleepers. The damping layer comprises two layers of steel plates, and rubber is arranged between the two layers of steel plates. The fabricated longitudinal superposed beam sleeper vibration reduction system solves the three technical problems of difficult low-frequency vibration isolation, high stress concentration and high maintenance cost existing in the field of rail traffic vibration reduction for a long time.

Description

Technical Field

[0001] This invention relates to a prefabricated longitudinal composite beam sleeper vibration reduction system, belonging to the field of rail transit technology. Background Technology

[0002] With the rapid development of urban rail transit, track vibration reduction systems face higher requirements. However, traditional vibration reduction methods such as sleepers, floating slabs, and longitudinal sleepers have several problems: 1. Stress concentration leads to a large amount of maintenance; 2. Cast-in-place construction has a long construction period, and the installation work is slow and inefficient; 3. Not disassembled, resulting in high maintenance costs; 4. The quality of cast-in-place concrete is difficult to control, which affects the safety of the project; 5. Even if prefabricated components are used as the whole, the large size of the components requires the use of large equipment for installation, which is particularly disadvantageous for construction projects with limited space, such as subways. 6. Existing vibration-damping sleepers, floating slabs, and other systems have a natural frequency of 20~30Hz. Without effectively reducing their natural frequency, their vibration reduction effect cannot be significantly improved. 7. Traditional longitudinal sleeper systems are prefabricated sleepers that cannot be effectively fitted on curved sections, making geometric adjustment difficult.

[0003] These problems have led to the existing sleeper vibration reduction system gradually becoming unable to meet the development needs of urban rail transit. Therefore, it is necessary to conduct more in-depth research on the existing sleeper vibration reduction system in order to solve the above problems. Summary of the Invention

[0004] To overcome the above problems, in-depth research was conducted, and a prefabricated longitudinal composite beam sleeper vibration reduction system was designed, including longitudinal sleepers, transverse connectors, and elastic vibration damping components. The longitudinal sleeper is a composite beam structure, including an upper beam and a lower beam, with a damping layer provided at the interface between the upper and lower beams. The transverse connector is transversely connected between the two longitudinal sleepers. The elastic damping component is installed at the bottom of the longitudinal sleeper.

[0005] In a preferred embodiment, the damping layer comprises two steel plates with rubber disposed between the two steel plates.

[0006] In a preferred embodiment, the two steel plates are integrally molded with the rubber through vulcanization.

[0007] In a preferred embodiment, prestressed bolts are provided on the upper part of the longitudinal sleeper to adjust the stress between the upper and lower beams.

[0008] In a preferred embodiment, the end of the lateral connector has an elastic pad.

[0009] In a preferred embodiment, the elastic pad includes a transverse steel plate and a rubber layer, the rubber layer being connected to the side of the longitudinal sleeper, and the transverse steel plate being disposed outside the rubber layer.

[0010] In a preferred embodiment, the prefabricated longitudinal composite beam sleeper vibration reduction system further includes a limiting support, which is disposed on the side of the longitudinal sleeper.

[0011] In a preferred embodiment, the limiting support is L-shaped and is disposed on the side of the longitudinal sleeper, with an elastic buffer pad attached to the outside.

[0012] This invention also discloses a construction method for a prefabricated longitudinal composite beam sleeper vibration reduction system, which uses the above-mentioned system and includes the following steps: S1. Lay longitudinal sleepers along the longitudinal direction of the track, and lay elastic vibration damping components under the longitudinal sleepers before laying them; S2. Transverse connectors are used to connect longitudinal sleepers laterally. S3. The longitudinal sleeper is laterally fixed by the limiting support.

[0013] In a preferred embodiment, in S1, after the longitudinal sleepers are laid, the stiffness of the longitudinal sleepers is adjusted by prestressed bolts.

[0014] This invention solves a series of problems existing in traditional track vibration reduction systems through multi-dimensional synergy of composite beam structure, damping layer and prefabricated construction, and its beneficial effects include: (1) The natural frequency is reduced. The natural frequency of the system is reduced from the traditional 20-30Hz to 8-15Hz, which realizes efficient isolation of the low-frequency vibration (5-50Hz) dominated by the subway train and solves the long-standing problem of "difficulty in low-frequency vibration isolation" in the field of rail transit vibration reduction. (2) Achieve precise fitting of curve segments and perform “curve fine-tuning”. By fine-tuning the curvature radius of the sleepers through the transverse connecting parts, the problem that traditional prefabricated sleepers cannot adapt to small-radius curves can be solved. The accuracy of form and position control can be adjusted so that the track gauge deviation is controlled within ±1mm. (3) Realize dynamic adjustment of sleeper stiffness. By setting the magnitude of the prestress applied by the prestressing bolts, the sleeper stiffness can be dynamically adjusted to adapt to different scenarios, thus solving the long-standing problem of "high stress concentration" in the field of vibration reduction of rail transit. (4) It solves the industry pain points such as "long construction period of cast-in-place" and "non-removable", improves construction efficiency, reduces construction period, and solves the long-standing problem of "high maintenance cost" in the field of vibration reduction of rail transit. Attached Figure Description

[0015] Figure 1 A front view of a prefabricated longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present invention is shown; Figure 2 A perspective view of a prefabricated longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present invention is shown. Figure 3 A schematic diagram of the damping layer structure in a prefabricated longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present invention is shown. Figure 4 A schematic diagram of the elastic pad structure in a prefabricated longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present invention is shown. Figure 5 A side view of a prefabricated longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present invention is shown.

[0016] Explanation of icon numbers: 1-Longitudinal sleepers; 2- Lateral connectors; 3-Elastic vibration damping components; 4-Prestressed bolts; 11-Raising the main beam; 12-Lower beam; 13-Damping layer; 21-Elastic pad; 131-steel plate; 132-Rubber 221 - Horizontal steel plate; 222 - Rubber layer. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Through these descriptions, the features and advantages of the present invention will become clearer and more apparent.

[0018] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments. Although various aspects of embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless specifically indicated otherwise.

[0019] According to the present invention, a prefabricated longitudinal composite beam sleeper vibration reduction system is provided, such as... Figure 1 , Figure 2 , Figure 5 As shown, it includes a longitudinal sleeper 1, a transverse connecting member 2, and an elastic vibration damping component 3. The longitudinal sleeper 1 is a composite beam structure, including an upper beam 11 and a lower beam 12, with a damping layer 13 provided at the interface between the upper and lower beams. Prestressed bolts 4 are installed on the upper part of the longitudinal sleeper to adjust the stress between the upper beam and the lower beam; The transverse connector 2 is transversely connected between the two longitudinal sleepers 1. The elastic damping component 3 is installed at the bottom of the longitudinal sleeper.

[0020] According to the present invention, the longitudinal sleeper refers to a sleeper arranged along the longitudinal direction of the track. The longitudinal sleeper may be made of prestressed concrete or other structural materials, and there is no limitation in the present invention.

[0021] A composite beam structure refers to a beam formed in two stages. Generally, the lower beam is precast first, and then the upper beam is poured after the lower beam is completed, connecting the upper and lower beams into a whole. The connection point between the upper and lower beams is the middle interface of the composite beam. It should be noted that the composite beam structure in this invention is not limited to the pouring method and can adopt any known forming method. Preferably, in this invention, both the upper and lower beams are precast.

[0022] Existing sleeper laying generally uses discrete transverse sleepers, which have stress concentration problems, resulting in a high damage rate and a large amount of maintenance. In this invention, a longitudinal continuous composite beam is used to distribute the load evenly.

[0023] According to the present invention, the longitudinal sleeper adopts a composite beam structure. Compared with the existing longitudinal sleeper, the original integral longitudinal sleeper is divided into two composite beams, which can reduce the stiffness and natural frequency of the sleeper, thereby expanding the vibration reduction frequency band and increasing the vibration reduction effect.

[0024] According to the present invention, the damping layer provided at the middle interface between the upper and lower beams of the longitudinal sleeper (i.e., the middle interface of the composite beam) participates in the vibration when the sleeper is subjected to train load vibration reduction, thereby increasing the damping of the sleeper. The setting of the damping layer adds an elastic vibration reduction measure to the sleeper, thereby realizing multi-level vibration reduction, which can effectively improve the vibration reduction effect and reduce the energy consumption of the train.

[0025] Preferably, the damping layer 13 comprises two steel plates 131, with rubber 132 disposed between the two steel plates, such as... Figure 3 As shown.

[0026] More preferably, the rubber layer loss factor η ≥ 0.2 and the steel plate thickness is 2-5 mm. Under these parameters, the energy dissipation capacity matches the rail environment, which is beneficial to improving the vibration reduction effect of the train.

[0027] More preferably, the rubber between the two steel plates is integrally vulcanized. This integral molding design improves sealing performance, enhances structural strength and stability, and better adapts to the complex environmental conditions of railway tracks.

[0028] More preferably, the vulcanization temperature is 130℃-200℃, and the pressure is 1-20 MPa, more preferably 4.5-5.5 MPa, for example 5 MPa. These parameters can eliminate gas inside the rubber compound, ensure the compactness and dimensional accuracy of the product, promote heat conduction, and accelerate the vulcanization process.

[0029] According to the present invention, the thickness of the damping layer rubber is determined by the geometry of the track line, the fine-tuning data of the track at the construction site, etc.

[0030] According to the present invention, by setting prestressed bolts on the upper part of the composite beam of the longitudinal sleeper, vertical prestress can be applied to the composite beam, and the overall stiffness, natural frequency and deformation of the composite beam can be adjusted by applying the prestress.

[0031] Composite beam structures are used in prefabricated floor slab construction, typically in high-rise building construction. Their design aims to reduce the weight of assembled components and facilitate hoisting. In this invention, the composite beam structure is applied to longitudinal sleepers. Combined with the aforementioned damping layer, the overall stiffness of the sleepers can be effectively reduced. Furthermore, with the addition of prestressed bolts, dynamic adjustment of stiffness can be achieved, reducing the system's natural frequency from the traditional 20-30Hz to 8-15Hz, thus achieving efficient isolation of the dominant low-frequency vibrations (5-50Hz) of subway trains.

[0032] According to the present invention, the prestressed bolts are fixed and prestressed at the construction site, and the magnitude of the prestress is determined by calculating the stiffness required for the sleeper vibration reduction.

[0033] According to the present invention, the transverse connecting member 2 serves to connect the longitudinal sleeper 1 laterally and bear a certain sleeper load, torque, and vibration.

[0034] In a preferred embodiment, the transverse connector is a steel-concrete composite member or a prestressed concrete member, which bears the bending moment and transverse axial force when the sleeper vibrates and deforms; it is connected to the connection node pre-set on the side of the longitudinal sleeper, and the entire sleeper system is spliced ​​and installed on the construction site.

[0035] According to the present invention, the width of the transverse connector is designed according to the load and stiffness requirements, and its shape can be square, circular, or I-shaped, etc., without limitation in the present invention. The number of transverse connectors between a pair of longitudinal sleepers can be 2 to 6 depending on specific needs, and the number is determined by the location, environment, or length of each pair of longitudinal sleeper units. The height of the longitudinal sleeper is higher than the height of the transverse connector.

[0036] In traditional longitudinal sleepers, large curve sections need to be pre-laid as a whole, and it is generally not possible to lay small radius (radius less than 300 meters) curve sections.

[0037] In a preferred embodiment of the present invention, the end of the transverse connector has an elastic pad 21, allowing for fine-tuning of the length of the transverse connector. The elastic pad adjusts the geometry of the sleeper to adapt to different requirements of straight and curved sections, and also adjusts the vector of the curved sleeper. This solves the problem that traditional longitudinal sleepers cannot adjust vectors or perform curvature fitting on curved sections, and also addresses the problem that traditional prefabricated sleepers cannot adapt to small-radius curves. Furthermore, it enables the sleeper of the present invention to be modularly adaptive, allowing for on-site adjustment of shape and position control precision, ensuring that the gauge deviation is controlled within ±1mm.

[0038] According to the present invention, the thickness of the elastic pad 21 is determined based on the geometry of the track line, the fine-tuning data of the line at the construction site, etc., and it is fixed at the construction site by the bolts of the transverse connecting member.

[0039] According to the present invention, longitudinal sleepers can be connected together on the construction site by transverse connectors, so that the longitudinal sleepers and transverse connectors form a frame structure. This method allows the sleeper laying to be carried out in a prefabricated manner, thereby reducing the track laying period.

[0040] In a preferred embodiment, the elastic pad 21 includes a transverse steel plate 221 and a rubber layer 222, such as Figure 4 As shown, elasticity is provided by a rubber layer 222, which is connected to the longitudinal side of the sleeper. The transverse steel plate 221 is disposed on the outside of the rubber layer to protect it.

[0041] Preferably, the elastic pad 21 is fixed to the longitudinal sleeper by bolts.

[0042] The elastic vibration damping component 3 can be installed at intervals on the bottom of the longitudinal sleeper, i.e., in a spot-laying manner; or it can be fully installed on the bottom of the longitudinal sleeper, i.e., in a surface-laying manner. In this invention, no limitation is made.

[0043] In this invention, the elastic vibration damping component can be replaced in a modular fashion, which can reduce maintenance costs by more than 50% compared to the overall sleeper scrapping repair method.

[0044] In this invention, the specific structure or material of the elastic damping component is not limited. Those skilled in the art can use any existing elastic damping component, such as an elastic pad, rubber, polyurethane or a spring.

[0045] In a preferred embodiment, the prefabricated longitudinal composite beam sleeper vibration reduction system further includes a limiting support, which is disposed on the side of the longitudinal sleeper to limit the geometric position and displacement of the overall longitudinal sleeper system.

[0046] In a preferred embodiment, the limiting support is L-shaped and is disposed on the side of the longitudinal sleeper, with an elastic buffer pad attached to the outside.

[0047] This invention also discloses a construction method for a prefabricated longitudinal composite beam sleeper vibration reduction system, which uses the aforementioned prefabricated longitudinal composite beam sleeper vibration reduction system and includes the following steps: S1. Lay longitudinal sleepers along the longitudinal direction of the track, and lay elastic vibration damping components under the longitudinal sleepers before laying them; S2. Transverse connectors are used to connect longitudinal sleepers laterally. S3. The longitudinal sleeper is laterally fixed by the limiting support.

[0048] In S1, a damping layer is installed above the lower beam, and the upper beam is laid on the damping layer.

[0049] Preferably, in S1, both the upper beam and the lower beam are fabricated in the prefabrication yard. After adding a damping layer in the prefabrication yard, the upper beam and the lower beam are installed together and fixed with prestressed bolts to apply prestress.

[0050] Preferably, in S1, after the longitudinal sleepers are laid, the stiffness of the longitudinal sleepers is adjusted by prestressed bolts, reducing the system's natural frequency from the traditional 20-30Hz to 8-15Hz.

[0051] In S2, the transverse connecting parts and the longitudinal sleepers are connected by bolts, and the curvature radius of the sleepers can be finely adjusted by selecting elastic pads of appropriate thickness.

[0052] According to the present invention, the prefabricated installation method improves the track laying speed, effectively reduces the construction period, and solves industry pain points such as "long construction period for cast-in-place" and "non-removable".

[0053] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship in the working state of this invention, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The present invention has been described above with reference to preferred embodiments; however, these embodiments are merely exemplary and illustrative. Various substitutions and modifications can be made to the present invention based on these embodiments, all of which fall within the scope of protection of the present invention.

Claims

1. A fabricated longitudinal superposed beam sleeper vibration reduction system, characterized in that, The system comprises longitudinal sleepers, transverse connecting pieces and elastic damping components, The longitudinal sleepers are of a laminated beam structure, comprising upper and lower beams, and a damping layer is arranged at the interface between the upper and lower beams, The transverse connecting pieces are transversely connected between two longitudinal sleepers, The elastic damping components are arranged at the bottom of the longitudinal sleepers.

2. The assembled longitudinal laminated beam sleeper damping system according to claim 1, wherein The damping layer comprises two steel plates with rubber arranged therebetween.

3. The assembled longitudinal laminated beam sleeper damping system according to claim 2, wherein The two steel plates are integrally formed with the rubber by vulcanization.

4. The assembled longitudinal laminated beam sleeper damping system according to claim 1, wherein Prestressed bolts are arranged at the upper part of the longitudinal sleepers for adjusting the stress between the upper and lower beams.

5. The assembled longitudinal laminated beam sleeper damping system according to claim 1, wherein The end of the transverse connecting piece is provided with an elastic pad.

6. The assembled longitudinal laminated beam sleeper damping system according to claim 5, wherein The elastic pad comprises a transverse steel plate and a rubber layer, the rubber layer is connected to the side of the longitudinal sleeper, and the transverse steel plate is arranged outside the rubber layer.

7. The assembled longitudinal laminated beam sleeper damping system according to claim 1, wherein The assembled longitudinal laminated beam sleeper damping system further comprises a limiting support, which is arranged laterally to the longitudinal sleeper.

8. The assembled longitudinal laminated beam sleeper damping system according to claim 7, wherein The limiting support is L-shaped, arranged at the side of the longitudinal sleeper, and externally attached with an elastic buffer pad.

9. A construction method of an assembled longitudinal laminated beam sleeper damping system, which is constructed by using the system of any one of claims 1-8, comprising the following steps: S1. Laying longitudinal sleepers along the longitudinal direction of the track, and laying elastic damping components under the longitudinal sleepers before laying the longitudinal sleepers; S2. Transversely connecting the longitudinal sleepers by using transverse connecting pieces; S3. Laterally fixing the longitudinal sleepers by using limiting supports.

10. The construction method of the assembled longitudinal laminated beam sleeper damping system according to claim 9, wherein In S1, after the longitudinal sleepers are laid, the stiffness of the longitudinal sleepers is adjusted by using prestressed bolts.

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