An assembled longitudinal laminated beam sleeper damping system

Abstract

The application discloses an assembled longitudinal laminated beam sleeper damping system and belongs to the technical field of rail transit. The longitudinal sleeper is a laminated beam structure and comprises an upper beam and a lower beam. A damping layer is arranged at the interface between the upper beam and the lower beam. A transverse connecting piece is transversely connected between two longitudinal sleepers. An elastic damping component is arranged at the bottom of the longitudinal sleeper. The damping layer comprises two steel plates, and rubber is arranged between the two steel plates. The assembled longitudinal laminated beam sleeper damping system solves the three technical problems of difficulty in low-frequency vibration isolation, high stress concentration and high maintenance cost in the field of rail transit damping.

Description

TECHNICAL FIELD

[0001] The present application relates to an assembled longitudinal laminated beam sleeper damping system, belonging to the technical field of rail transit. BACKGROUND

[0002] With the rapid development of urban rail transit, the track damping system is facing higher requirements, but the traditional sleeper, floating slab and longitudinal sleeper damping mode has the following problems:

[0003] 1. Stress concentration, large maintenance amount;

[0004] 2. Long cast period, slow installation operation and poor efficiency;

[0005] 3. Non-detachable, high maintenance cost;

[0006] 4. It is difficult to control the quality of cast-in-place, which affects the safety of the project;

[0007] 5. Even if the prefabricated components are used as a whole, large equipment is needed for installation due to the huge component volume, which is particularly disadvantageous for space-limited engineering construction such as subway;

[0008] 6. The existing damping sleeper and floating slab system has a natural frequency of 20-30Hz, and under the premise that the natural frequency cannot be effectively reduced, the damping effect cannot be effectively improved;

[0009] 7. The traditional longitudinal sleeper system is a whole prefabricated sleeper, which cannot be effectively fitted in the curve section, and the geometric position adjustment is difficult.

[0010] These problems have led to the fact that the existing sleeper damping system has gradually failed to meet the development of urban rail transit, and therefore, it is necessary to conduct more in-depth research on the existing sleeper damping system to solve the above problems. SUMMARY

[0011] In order to overcome the above problems, an assembled longitudinal laminated beam sleeper damping system is designed, which comprises a longitudinal sleeper, a transverse connecting piece and an elastic damping part,

[0012] The longitudinal sleeper is a laminated beam structure, comprising an upper beam and a lower beam, and a damping layer is arranged at the interface between the upper beam and the lower beam,

[0013] The transverse connecting piece is transversely connected between two longitudinal sleepers,

[0014] The elastic damping part is arranged at the bottom of the longitudinal sleeper.

[0015] In a preferred embodiment, the damping layer comprises two layers of steel plates, and rubber is arranged between the two layers of steel plates.

[0016] In a preferred embodiment, the two layers of steel plates are integrally formed with rubber vulcanization.

[0017] In a preferred embodiment, prestressed bolts are arranged on the upper part of the longitudinal sleeper for adjusting the stress between the upper beam and the lower beam.

[0018] In a preferred embodiment, the end of the transverse connecting piece is provided with an elastic pad.

[0019] In a preferred embodiment, 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.

[0020] In a preferred embodiment, the assembled longitudinal composite beam sleeper damping system is further provided with a limiting support, and the limiting support is arranged laterally on the longitudinal sleeper.

[0021] In a preferred embodiment, the limiting support is L-shaped, arranged on the side of the longitudinal sleeper, and externally attached with an elastic buffer pad.

[0022] The application also discloses a construction method of the assembled longitudinal composite beam sleeper damping system, which is performed by using the system and comprises the following steps.

[0023] S1, laying the longitudinal sleeper along the longitudinal direction of the track, and laying the elastic damping component under the longitudinal sleeper before laying the longitudinal sleeper;

[0024] S2, connecting the longitudinal sleepers transversely by using the transverse connecting piece;

[0025] S3, laterally fixing the longitudinal sleeper by using the limiting support.

[0026] In a preferred embodiment, after the longitudinal sleeper is laid in S1, the stiffness of the longitudinal sleeper is adjusted by using the prestressed bolt.

[0027] The application solves the series of problems existing in the traditional track damping system by the cooperation of the composite beam structure, the damping layer and the assembled multi-dimension, and has the beneficial effects including:

[0028] (1) The self-vibration frequency is reduced, the self-vibration frequency of the system is reduced from 20-30 Hz to 8-15 Hz, the main low-frequency vibration (5-50 Hz) of the subway train is efficiently isolated, and the problem of "low-frequency vibration isolation difficulty" existing in the field of track transportation damping is solved;

[0029] (2) The curve segment is accurately fitted, and the "curve fine adjustment" is performed, the curvature radius of the sleeper is fine adjusted by using the transverse connecting piece, the problem that the traditional integral prefabricated sleeper cannot adapt to the small radius curve is solved, the shape and position control precision can be adjusted, and the track gauge deviation can be controlled within ±1 mm;

[0030] (3) Realize the dynamic adjustment of the sleeper stiffness, dynamically adjust the sleeper stiffness by setting the size of the prestress applied by the prestressed bolt, adapt to different situations, and solve the long-standing problem of "stress concentration high" in the field of rail transit vibration reduction;

[0031] (4) Solve the industry pain points of "long cast period" and "non-dismountable", improve the construction efficiency, reduce the construction period, and solve the long-standing problem of "high maintenance cost" in the field of rail transit vibration reduction. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A front view of the assembled longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present application is shown.

[0033] Figure 2 A perspective view of the assembled longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present application is shown.

[0034] Figure 3 A schematic diagram of the damping layer structure in the assembled longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present application is shown.

[0035] Figure 4 A schematic diagram of the elastic pad structure in the assembled longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present application is shown.

[0036] Figure 5 A side view of the assembled longitudinal composite beam sleeper vibration reduction system according to a preferred embodiment of the present application is shown.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 1 - longitudinal sleeper;

[0039] 2 - transverse connecting piece;

[0040] 3 - elastic damping component;

[0041] 4 - prestressed bolt;

[0042] 11 - upper beam;

[0043] 12 - lower beam;

[0044] 13 - damping layer;

[0045] 21 - elastic pad;

[0046] 131 - steel plate;

[0047] 132 - rubber

[0048] 221 - transverse steel plate;

[0049] 222 - rubber layer. DETAILED DESCRIPTION

[0050] The application will be further described in details by the accompanying drawings and examples. The features and advantages of the application will become more apparent through these descriptions.

[0051] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations. Unless specifically indicated otherwise, the drawings are not necessarily to scale.

[0052] According to the application, a longitudinal composite beam sleeper vibration reduction system is provided, as shown in Figure 1 、 Figure 2 、 Figure 5 which comprises longitudinal sleepers 1, transverse connecting members 2 and elastic vibration reduction components 3.

[0053] The longitudinal sleeper 1 is a composite beam structure, comprising an upper beam 11 and a lower beam 12, and a damping layer 13 is arranged at the interface between the upper beam and the lower beam.

[0054] A prestressed bolt 4 is arranged at the upper part of the longitudinal sleeper, for adjusting the stress between the upper beam and the lower beam.

[0055] The transverse connecting member 2 is transversely connected between two longitudinal sleepers 1.

[0056] The elastic vibration reduction component 3 is arranged at the bottom of the longitudinal sleeper.

[0057] According to the application, the longitudinal sleeper refers to a sleeper arranged along the longitudinal direction of the track, which can be composed of prestressed concrete or other structural materials, which is not limited in the application.

[0058] The composite beam structure refers to a beam formed in two times. Generally, the lower beam is prefabricated first, and then the upper beam is poured and tamped after the completion of the lower beam, so that the upper and lower beams are connected into a whole, and the connecting position of the upper and lower beams is the interface of the composite beam. It should be noted that the composite beam structure in the application is not limited to the pouring and tamping method, and any known forming method can be used. Preferably, in the application, the upper beam and the lower beam are both prefabricated.

[0059] The existing sleeper laying generally adopts discrete transverse sleepers, which has the problem of stress concentration, resulting in a high damage rate and a large amount of maintenance. In the application, the longitudinal continuous composite beam is used to uniformly distribute the load.

[0060] According to the application, the longitudinal sleeper adopts a laminated beam structure, compared with the existing longitudinal sleeper, the original integral longitudinal sleeper is divided into two laminated beams, which can reduce the stiffness and natural frequency of the sleeper, and plays a role in expanding the vibration frequency range and increasing the damping effect.

[0061] According to the application, the damping layer arranged at the interface between the upper beam and the lower beam of the longitudinal sleeper (i.e. the interface of the laminated beam) participates in vibration when the sleeper is subjected to train load damping, increases the damping of the sleeper, and the arrangement of the damping layer adds an elastic damping measure to the sleeper, thereby realizing multi-stage damping, effectively improving the damping effect, and reducing the energy consumption of the train.

[0062] Preferably, the damping layer 13 comprises two steel plates 131, and rubber 132 is arranged between the two steel plates, as shown in the figure. Figure 3

[0063] More preferably, the loss factor η of the rubber layer is greater than or equal to 0.2, and the thickness of the steel plate is 2-5 mm. Under this parameter, the energy dissipation capacity is matched with the rail environment, which is conducive to improving the train damping effect.

[0064] More preferably, the two steel plates and the rubber therebetween are integrally formed by vulcanization. The integrally formed arrangement can improve the sealing performance, enhance the structural strength and stability, and better adapt to the complex environmental conditions of the rail.

[0065] More preferably, the vulcanization temperature is 130-200℃, the pressure is 1-20Mpa, and more preferably 4.5-5.5Mpa, for example 5MPa. This parameter can exclude the gas inside the rubber material, ensure the density and size accuracy of the product, promote heat conduction, and accelerate the vulcanization process.

[0066] According to the application, the thickness of the damping layer rubber is determined by the geometric position of the track line, the line fine adjustment data of the construction site, etc.

[0067] According to the application, by arranging a prestressed bolt on the upper part of the laminated beam of the longitudinal sleeper, vertical prestress can be applied to the laminated beam, and the overall stiffness, natural frequency and deformation of the laminated beam can be adjusted by applying the prestress.

[0068] The laminated beam structure is a structure used in the assembly floor, which is generally used in high-rise building construction, and the design purpose is to reduce the weight of the assembled components and facilitate hoisting. In the present application, the laminated beam structure is applied to the longitudinal sleeper, and in combination with the damping layer, the overall stiffness of the sleeper can be effectively reduced. Further, in combination with the arranged prestressed bolt, dynamic adjustment of the stiffness can be realized, the system natural frequency is reduced from the traditional 20-30Hz to 8-15Hz, and efficient isolation of the dominant low-frequency vibration (5-50Hz) of the subway train is realized. ​

[0069] According to the application, the prestressed bolt is fixed and prestressed at the construction site, and the prestress is determined by calculating the rigidity required for the sleeper to reduce vibration.

[0070] According to the application, the transverse connecting piece 2 serves to transversely connect the longitudinal sleepers 1 and bear certain sleeper loads and torques and vibrations.

[0071] In a preferred embodiment, the transverse connecting piece is a steel pipe concrete member or a prestressed concrete member, which bears the bending moment and transverse axial force when the sleeper vibrates and deforms, is connected with the connecting node previously arranged on the side of the longitudinal sleeper, and is integrally spliced and installed with the sleeper system at the construction site.

[0072] According to the application, the width of the transverse connecting piece is designed according to the load and rigidity requirements, and the shape can be square, circular, or I-shaped, which is not limited in the application. The number of the transverse connecting pieces between a pair of longitudinal sleepers can be 2-6 according to specific needs, which is determined by the position, environment, or the length of each pair of longitudinal sleeper units. The height of the longitudinal sleeper is higher than that of the transverse connecting piece.

[0073] In the traditional longitudinal sleeper, the large curve section needs to be pre-installed as a whole, and generally cannot be laid in a small radius (less than 300 meters) curve section.

[0074] In a preferred embodiment of the application, the transverse connecting piece end has an elastic pad 21, so that the length of the transverse connecting piece can be finely adjusted, the geometric position of the sleeper is adjusted through the elastic pad to adapt to the different requirements of the straight section and the curve section, and the vector of the curve sleeper is adjusted, thereby solving the problem that the traditional longitudinal sleeper cannot adjust the vector and perform curvature fitting in the curve section, and solving the problem that the traditional whole precast sleeper cannot adapt to the small radius curve. In addition, it also enables the sleeper of the application to be modularized and self-adapting, and the geometric position control accuracy can be adjusted on site, so that the gauge deviation is controlled within ±1mm.

[0075] According to the application, the thickness of the elastic pad 21 is determined according to the geometric position of the track line, the line fine adjustment data of the construction site, etc., and is fixed by the bolt of the transverse connecting piece at the construction site.

[0076] According to the application, the longitudinal sleepers can be connected together by the transverse connecting pieces at the construction site, so that the longitudinal sleepers and the transverse connecting pieces form a frame structure. This way makes the sleeper laying adopt the assembly type, thereby reducing the track laying period.

[0077] In a preferred embodiment, the elastic pad 21 includes a transverse steel plate 221 and a rubber layer 222, as shown in Figure 4As shown, the rubber layer 222 is connected to the longitudinal sleeper side to provide elasticity, and the lateral steel plate 221 is arranged outside the rubber layer to protect the rubber layer.

[0078] Preferably, the elastic pad 21 is fixed on the longitudinal sleeper by bolts.

[0079] The elastic damping component 3 can be installed at the bottom of the longitudinal sleeper in a spaced manner, i.e. in a point paving manner, or can be installed at the bottom of the longitudinal sleeper in a full paving manner, i.e. in a surface paving manner, which is not limited in the present application.

[0080] In the present application, the elastic damping component can be modularly replaced, and compared with the whole sleeper scrap type maintenance, the maintenance cost can be reduced by more than 50%.

[0081] In the present application, the specific structure or material of the elastic damping component is not limited, and any existing elastic damping component can be used by those skilled in the art, such as using elastic pad, rubber, polyurethane or spring as the elastic damping component.

[0082] In a preferred embodiment, the assembled longitudinal laminated beam sleeper damping system further has a limiting support, which is arranged laterally on the longitudinal sleeper to limit the geometric position and displacement of the whole longitudinal sleeper system.

[0083] In a preferred embodiment, the limiting support is L-shaped, arranged on the side of the longitudinal sleeper, and externally attached with an elastic buffer pad.

[0084] The present application also discloses a construction method of an assembled longitudinal laminated beam sleeper damping system, which is carried out by using the above-mentioned assembled longitudinal laminated beam sleeper damping system, and comprises the following steps:

[0085] S1, laying the longitudinal sleeper along the longitudinal direction of the track, and laying the elastic damping component under the longitudinal sleeper before laying the longitudinal sleeper;

[0086] S2, connecting the longitudinal sleepers laterally by using the lateral connecting member;

[0087] S3, fixing the longitudinal sleeper laterally by using the limiting support.

[0088] In S1, the damping layer is arranged above the lower beam, and the upper beam is laid on the damping layer.

[0089] Preferably, in S1, the upper beam and the lower beam are both manufactured in the prefabrication field, and after adding the damping layer in the prefabrication field, the upper beam and the lower beam are installed together and fixed by prestressed bolts to apply prestress.

[0090] Preferably, in S1, after the laying of the longitudinal sleeper, the longitudinal sleeper stiffness is adjusted by prestressed bolts, so that the system natural frequency is reduced from the traditional 20-30Hz to 8-15Hz.

[0091] In S2, the transverse connecting piece is connected with the longitudinal sleeper by bolts, and the micro-adjustment of the sleeper curvature radius is realized by selecting an elastic pad with a suitable thickness.

[0092] According to the present application, the assembly type installation method improves the track laying speed, effectively reduces the construction period, and solves the industry pain points of long cast-in-place construction period and non-dismountable.

[0093] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "back" and the like indicate the orientation or positional relationship in the working state of the present application, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", "fourth" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance.

[0094] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0095] The above describes the present application in combination with the preferred embodiments, but these embodiments are only exemplary and serve only to illustrate. On this basis, various substitutions and improvements can be made to the present application, which all fall within the scope of protection of the present application.

Claims

1. A fabricated longitudinal superposed beam sleeper vibration reduction system, characterized in that, The longitudinal sleeper, the transverse connecting piece and the elastic damping component are provided. The longitudinal sleeper is a laminated beam structure, comprising an upper beam and a lower beam, and a damping layer is arranged at the interface between the upper beam and the lower beam, the damping layer comprising two layers of steel plates with rubber arranged between the two layers of steel plates. The transverse connecting piece is transversely connected between two longitudinal sleepers. The elastic damping component is arranged at the bottom of the longitudinal sleeper. A prestressed bolt is arranged at the upper part of the longitudinal sleeper for adjusting the stress between the upper beam and the lower beam. The end of the transverse connecting piece is provided with an elastic pad, so that the length of the transverse connecting piece can be finely adjusted, the geometric position of the sleeper is adjusted by the elastic pad to adapt to different requirements of straight sections and curved sections, and the vector of the curved sleeper is adjusted.

2. The assembled longitudinal laminated beam sleeper damping system according to claim 1, wherein the two layers of steel plates and the rubber are integrally formed by vulcanization.

3. The assembled longitudinal laminated beam sleeper damping system according to claim 1, 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.

4. 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, and the limiting support is arranged laterally on the longitudinal sleeper.

5. The assembled longitudinal laminated beam sleeper damping system according to claim 4, wherein the limiting support is L-shaped, arranged on the side of the longitudinal sleeper, and externally attached with an elastic buffer pad.

6. A construction method of an assembled longitudinal laminated beam sleeper damping system, which is constructed by using the system according to any one of claims 1-5, comprising the following steps: S1. Laying the longitudinal sleeper along the longitudinal direction of the track, and laying the elastic damping component under the longitudinal sleeper before laying the longitudinal sleeper; S2. Transversely connecting the longitudinal sleepers by using the transverse connecting piece; S3. Laterally fixing the longitudinal sleeper by using the limiting support.

7. The construction method of the assembled longitudinal laminated beam sleeper damping system according to claim 6, wherein In S1, after the longitudinal sleeper is laid, the stiffness of the longitudinal sleeper is adjusted by the prestressed bolt. ​ ​ ​ ​

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