阅读说明：本技术 一种复合型浮置板轨道隔振器 (Composite floating slab track vibration isolator ) 是由 刘林芽 崔巍涛 左志远 秦佳良 于 2020-05-28 设计创作，主要内容包括：本发明公开了一种复合型浮置板轨道隔振器,它包括上盖板、弹簧、阻尼器、质量块和外套筒构成的第一部分与调节垫板、橡胶金属弹簧、内套筒、限位芯轴和底座板构成的第二部分；在列车经过时,第一部分的弹簧、阻尼器和质量块构成调谐质量阻尼器,控制低频振动,抑制浮置板结构在固有频率附近振动放大的不利影响；第二部分采用橡胶金属弹簧,起到有效减振和支撑浮置板道床的作用；该减振器结构简单,调谐质量阻尼器置于密闭腔室中,安装、更换方便,解决了现有浮置板轨道对低频控制不足、隔振元件更换困难的问题,经济性好,减振效果好。(The invention discloses a composite floating slab track vibration isolator which comprises a first part and a second part, wherein the first part is composed of an upper cover plate, a spring, a damper, a mass block and an outer sleeve, and the second part is composed of an adjusting base plate, a rubber metal spring, an inner sleeve, a limiting mandrel and a base plate; when a train passes by, the spring, the damper and the mass block of the first part form a tuned mass damper to control low-frequency vibration and inhibit the adverse effect of vibration amplification of the floating plate structure near the natural frequency; the second part adopts a rubber metal spring to play the roles of effectively damping vibration and supporting the floating slab track bed; the vibration absorber is simple in structure, the tuned mass damper is arranged in the closed cavity, the installation and the replacement are convenient, the problems that the existing floating slab track is insufficient in low-frequency control and the vibration isolation element is difficult to replace are solved, the economy is good, and the vibration absorbing effect is good.)

1. A composite floating plate track vibration isolator comprises a first part consisting of an upper cover plate (411), a spring (412), a damper (413), a mass block (414) and an outer sleeve (415), and a second part consisting of an adjusting base plate (421), a rubber metal spring (422), an inner sleeve (423), a limiting mandrel (424) and a base plate (425), wherein the outer sleeve (415) and a concrete floating plate (3) are poured together;

the first part is a closed cavity formed by an upper cover plate (411), an outer sleeve (415) and a concrete floating plate (3), and a spring (412), a damper (413) and a mass block (414) are arranged in the cavity;

the second part is that a limiting mandrel (424) is arranged on a base plate (425), a rubber metal spring (422) is placed between an inner sleeve (423) and the limiting mandrel (424), and an adjusting cushion plate (421) is positioned above the rubber metal spring (422).

2. The hybrid floating plate rail isolator of claim 1, wherein: the upper cover plate (411) is in threaded connection with the outer sleeve (415).

3. The hybrid floating plate rail isolator of claim 1, wherein: the spring (412) and damper (413) are circumferentially spaced 180 degrees apart.

4. The hybrid floating plate rail isolator of claim 1, wherein: the mass block (414), the spring (412) and the damper (413) are in bolt connection, and the mass block (414) is of a circular ring structure with a certain thickness.

5. The hybrid floating plate rail isolator of claim 1, wherein: and the external welding thread steel bars of the outer sleeve (415) are poured with the concrete floating plate (3).

6. The hybrid floating plate rail isolator of claim 1, wherein: the adjusting backing plate (421) is a triangular backing plate with different thicknesses, a circular bulge is arranged in the middle of the upper surface of the backing plate, and grooves with the same size are arranged in the middle of the lower surface of the backing plate.

7. The hybrid floating plate rail isolator of claim 1, wherein: the rubber metal spring (422) and the contacted adjusting cushion plate (421) are integrated with vulcanization.

8. The hybrid floating plate rail isolator of claim 1, wherein: the base plate (425), the inner sleeve (423) and the restraining mandrel (424) are welded together.

Technical Field

The invention relates to the field of vibration and noise control of urban rail transit, in particular to a composite floating plate rail vibration isolator.

Background

At present, a floating slab track structure of urban rail transit mainly adopts a steel spring vibration isolator and a rubber vibration isolator, and the vibration isolation frequency of the rubber floating slab track structure is narrow, the transverse rigidity is low, and the requirement on the transverse stability of a track bed cannot be met; the rubber supporting block is hidden under the floating plate, so that the leveling, the overhaul and the replacement are difficult; the requirement on rubber materials and processes is high, the rubber is easy to age, the replacement of the rubber supporting block has great influence on train operation and citizens' trip, and the cost of later-period maintenance is increased.

The first-order natural frequency of the steel spring floating plate track structure is near 10 Hz, theoretically, low-frequency vibration components above 14 Hz can be attenuated, vibration components which are required to be isolated by precision instruments and the like and have the frequency of 5-15 Hz cannot be attenuated, and vibration components in the frequency range can be amplified instead of being resonated due to the fact that the vibration excitation frequency is near the natural frequency, so that fatigue damage is caused to the building structure, the working precision of the precision instruments and meters along the line is lost, the working precision of electric parts is affected, and the production and life of surrounding personnel are affected, and the usually adopted mode is that the mass of the track structure is increased or the rigidity of the track structure is reduced; but because railways have clear regulatory requirements for the boundaries of building structures, the effect of increasing the quality of the track structure is very limited; and the rigidity of the track structure is reduced, so that the displacement of the track structure is increased, and the driving safety is influenced.

Disclosure of Invention

In order to overcome the problems in the background art, the invention provides a composite floating plate track vibration isolator, wherein a tuned mass damper is arranged in a reserved space among an upper cover plate, an outer sleeve and a concrete floating plate in the first part, and is composed of a spring, a damper and a mass block, so that the rigidity and damping parameters are reasonably designed, the low-frequency vibration can be controlled, and the adverse effect of vibration amplification of the floating plate structure near the natural frequency is inhibited; tuned mass dampers for controlling different frequency bands can be arranged, the targeted control on the sensitive vibration frequency of different areas is realized, the vibration reduction frequency range is wide, and the vibration reduction effect is good; adjusting shim plate, rubber metal spring, inner skleeve, spacing dabber and bed plate constitute the second part, and rubber metal spring plays the effect of damping and support, and spacing dabber increases system lateral stability and security, convenient maintenance and change, and the damping is effectual.

In order to achieve the above object, the present invention adopts the following technical solutions.

A composite floating slab track vibration isolator comprises a first part and a second part, wherein the first part is composed of an upper cover plate, a spring, a damper, a mass block and an outer sleeve, the second part is composed of an adjusting base plate, a rubber metal spring, an inner sleeve, a limiting core shaft and a base plate, and the outer sleeve and a concrete floating slab are poured together. The first part is a closed cavity formed by an upper cover plate, an outer sleeve and a concrete floating plate, and the spring, the damper and the mass block are arranged in the cavity; the second part is that the bed plate is provided with a limiting mandrel, the rubber metal spring is arranged between the inner sleeve and the limiting mandrel, and the adjusting base plate is positioned above the rubber metal spring.

In a preferred design, the outer sleeve is welded with a threaded steel bar.

In a preferred design, the upper cover plate is in threaded connection with the outer sleeve.

As a preferable design scheme, the spring is an extension spring, the upper ends of the extension spring and the damper are connected with the upper cover plate, and the lower ends of the extension spring and the damper are connected with the mass block; as the preferred design scheme, the spring is a compression spring, the lower ends of the compression spring and the damper are connected with the bottom of the outer sleeve, and the upper end of the compression spring and the damper are connected with the mass block.

In a preferred embodiment, the mass is made of cast iron or a material with a higher density.

In a preferred embodiment, the rubber-metal spring is vulcanized as a single piece with the contact adjusting shim plate.

As the preferred design scheme, the limiting mandrel is welded and fixed in the middle of the base plate.

As a preferable design scheme, the adjusting shim plate is a steel plate gasket with different thicknesses.

Compared with the prior art, the invention has the following beneficial effects: (1) the tuned mass damper of the first part can enable the track structure to realize the vibration phase opposition of the mass block and the floating plate on the natural frequency section by designing the rigidity and the damping parameters, reduce the action of the low-frequency vibration component of the floating plate structure and inhibit the adverse effect of vibration amplification of the floating plate structure near the natural frequency; tuned mass dampers for controlling different frequency bands can be arranged, the targeted control on the sensitive vibration frequency of different areas is realized, the vibration reduction frequency range is wide, and the vibration reduction effect is good.

(2) The upper cover plate, the outer sleeve and the concrete floating plate form a closed cavity, so that the service life of the element is long; the outer sleeve and the upper cover plate are in threaded connection, can be freely disassembled and assembled, facilitates replacement of internal tuning mass damper elements, and is reasonable in structure.

(3) The adjusting base plates with different thicknesses solve the problem of irregularity of the floating plate caused by uneven settlement, construction and the like in different areas, and the installation is also very convenient.

The composite floating slab track vibration isolator has the advantages of vibration isolation, long service life, convenience in replacement and the like; the vibration damping device has a good effect on low-frequency vibration and certain sensitive frequencies, is simple in structure and easy to implement, and can be widely applied to special vibration damping sections in urban rail transit.

Drawings

Fig. 1 is one of the structural principles and schematic diagrams of the composite floating slab track vibration isolator provided by the invention.

Fig. 2 is a second schematic structural diagram of the composite floating slab track vibration isolator according to the present invention.

Fig. 3 is a structural plan view of the composite floating slab track vibration isolator provided by the invention.

Fig. 4 is a cross-sectional view of a structure of the composite floating plate vibration isolator for track installation on a track according to the present invention.

Fig. 5 is a structural plan view of the composite floating plate vibration isolator for track mounted on a track according to the present invention.

In the figure, 1 is a steel rail, 2 is a fastener, 3 is a concrete floating plate, 4 is a vibration isolator, 411 is an upper cover plate, 412 is a spring, 413 is a damper, 414 is a mass block, 415 is an outer sleeve, 421 is an adjusting base plate, 422 is a rubber metal spring, 423 is an inner sleeve, 424 is a limiting mandrel, 425 is a base plate, 5 is a rubber water stop, 6 is a transverse limiter, 7 is a drainage ditch, 8 is a concrete foundation, and 9 is a shield segment.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples, without thereby limiting the scope of the invention.

As shown in fig. 1-3, the composite floating slab track vibration isolator adopted in this example comprises two parts, wherein the first part is formed by an upper cover plate 411, an outer sleeve 415 and a concrete floating slab 3 to form a closed cavity, a tuned mass damper is arranged in the cavity, the tuned mass damper is formed by a spring 412, a damper 413 and a mass block 414, the rigidity and damping parameters are reasonably designed, the low-frequency vibration can be controlled, and the adverse effect of vibration amplification of the floating slab structure near the natural frequency is inhibited; the closed chamber can effectively isolate the contact between the tuned mass damper element and air and water, the service life is prolonged, the upper cover plate 411 is easy to open, the tuned mass damper element is convenient to replace, tuned mass dampers for controlling different frequency bands are arranged on a circuit at the same time, the specific treatment of sensitive vibration frequencies in different areas can be realized, the vibration reduction frequency range is wide, and the vibration reduction effect is good.

Meanwhile, the second part is composed of an adjusting cushion plate 421, a rubber metal spring 422, an inner sleeve 423, a limiting mandrel 424 and a base plate 425; wherein the rubber metal spring 422 is arranged between the base plate 425 and the adjusting backing plate 421, one end of the rubber metal spring 422 is vulcanized with the contacting adjusting backing plate 421 into a whole, and the rubber metal spring 422 surrounds the limiting mandrel 424; the adjusting backing plate 421 is a triangular backing plate with different thicknesses, passes through a reserved opening of the outer sleeve 415 and is buckled and pressed on the rubber metal spring 422, so that the integral height of the concrete floating plate 3 is ensured to be consistent; the limiting mandrel 424 is welded and fixed on the base plate 425; its simple structure is compact, and rubber metal spring 422 can be dismantled, can conveniently and change the rubber metal spring 422 that goes wrong fast, and save time improves maintenance efficiency.

In fig. 2, the difference from fig. 1 is that a spring 412 and a damper 413 are placed at the bottom between the closed chambers, in this case, the spring 412 is a compression spring, and a mass 414 is supported by the spring 412 and the damper 413.

As shown in fig. 4-5, during construction, a waterproof layer is firstly laid inside the shield segment 9, then a concrete foundation 8 is poured, a drainage ditch 7 is reserved, a base plate 425 and an inner sleeve 423 are fixed on the concrete foundation 8, a limiting mandrel 424 is installed in the middle of the base plate 425, an outer sleeve 415 and a concrete floating plate 3 are laid on a line in a prefabricated mode, and a threaded steel bar is arranged on the outer sleeve 415 to enhance the connection firmness; then, installing a rubber metal spring 422 and an adjusting backing plate 421 to realize the jacking of the concrete floating plate 3; finally, the spring 412, the damper 413 and the mass block 414 are put into the reserved space between the outer sleeve 415 and the concrete floating plate 3, and the upper cover plate 411 is covered, thereby completing the installation.

The steel rail 1 is fixed on the concrete floating slab 3 through a fastener 2, a vibration isolator 4 is embedded into the concrete floating slab 3, rubber water stops 5 are arranged on two sides of the concrete floating slab 3, a transverse limiting device 6 is arranged between the rubber water stops 5 and a shield segment 9, the lower part of the vibration isolator 4 is a concrete foundation 8, and a drainage ditch 7 is arranged in the middle of the concrete foundation 8.

The working principle of the invention is as follows: when an urban rail passes through, the vibration of the concrete floating slab 3 can be caused, the vibration isolator 4 can generate vertical vibration along with the vibration, the first part of the vibration isolator 4 plays a role, and the tuned mass damper consisting of the spring 412, the damper 413 and the mass block 414 enables the vibration phase of the mass block 414 and the concrete floating slab 3 to be opposite on the natural frequency section of the rail structure, and the energy is consumed through the damper 413, so that the effect of low-frequency vibration components of the floating slab structure is reduced, the transmission of the energy to the concrete foundation 8 is reduced, and the influence on the surrounding environment is also reduced; the second part mainly plays a role in vibration isolation and support by the rubber metal spring 422, the limiting mandrel 424 increases the transverse stability and safety of the system, and the adjusting cushion plate 421 can be used for adjusting uneven sinking of the track structure. The device has the advantages of simple structure, convenient assembly and disassembly, good economical efficiency and good vibration damping effect.

It is to be understood that the foregoing is only illustrative of some of the principles of the composite floating plate track isolator of the present invention and is not intended to limit the invention to the exact construction and applications shown and described, and accordingly all modifications and equivalents that may be resorted to are intended to fall within the scope of the invention.