CN112626930A - Strip-paved periodic cushion shock-absorbing ballast bed - Google Patents
Strip-paved periodic cushion shock-absorbing ballast bed Download PDFInfo
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- CN112626930A CN112626930A CN202011523166.3A CN202011523166A CN112626930A CN 112626930 A CN112626930 A CN 112626930A CN 202011523166 A CN202011523166 A CN 202011523166A CN 112626930 A CN112626930 A CN 112626930A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B3/00—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails
- E01B3/28—Transverse or longitudinal sleepers; Other means resting directly on the ballastway for supporting rails made from concrete or from natural or artificial stone
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
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Abstract
The invention discloses a strip-paved periodic cushion shock-absorbing ballast bed which comprises a periodic composite ballast bed plate and a concrete substrate arranged below the periodic composite ballast bed plate, wherein the periodic composite ballast bed plate is formed by alternately arranging and consolidating concrete slabs and periodic cushion layers from top to bottom; the periodic cushion layer is formed by at least one strip-shaped base plate which is continuously expanded and extended along the travelling direction, the width of the base plate is smaller than that of the concrete slab, and the laying range of the base plates of the cushion layer in the same period does not exceed the concrete slab, so that a cushion layer strip laying form is formed; the projections of the periodic cushion layers positioned in the interlayer are completely overlapped, and the periodic cushion layers of the adjacent layers are aligned in the vertical direction or staggered in the transverse direction to form a one-dimensional or two-dimensional scattering periodic structure. This damping ballast bed can form the elastic wave forbidden band in vertical direction and horizontal, and vertical direction and horizontal vibration propagation are effectively controlled, through changing structure geometry and material composition, can initiatively adjust the forbidden band scope, and the controllability is strong.
Description
Technical Field
The invention relates to the field of vibration and noise reduction of rail transit, in particular to a strip-paved periodic cushion vibration-damping ballast bed.
Background
The rail vibration reduction measures widely adopted for controlling the vibration of the rail transit environment at present expose the following problems: (1) the principle of the conventional track vibration reduction is that the support rigidity is reduced or the vibration participating quality is increased, abnormal abrasion of a wheel rail can be caused by excessive vibration reduction or improper vibration reduction, so that rapid abnormal damage of equipment and parts is caused, the maintenance workload of a wheel rail system is increased, and even the stability and the safety of driving are influenced; (2) the vibration reduction section is long, the investment is high, and the cost increase caused by the vibration reduction of the track can reach 2 hundred million yuan by taking a subway with the length of 30km as an example; (3) the riding comfort of passengers in the road section paved with the steel spring floating plates is seriously damaged.
Solid physics studies have found that periodic media arranged in some manner have elastic wave bandgap characteristics, i.e. incident waves cannot propagate in the periodic medium when their frequency falls within the bandgap range. With the vigorous development of condensed state physics, the forbidden band characteristic of periodic structure is introduced into the field of acoustic vibration internationally, and the development of phononic crystal is the most rapid and typical.
At present, no innovative design for periodically designing the structure related to the rail transit by using the forbidden band characteristic of the periodic structure is provided, and the report of actively regulating and controlling the vibration is realized.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a strip-paved periodic cushion shock-absorbing ballast bed. According to the characteristics of a vibration source of rail transit and the vibration propagation attenuation rule, a periodic structure forbidden band theory is adopted to periodically design a ballast bed structure, and the geometric dimension and the material composition of the structure are changed, so that the active adjustment and control of the forbidden band and the vibration isolation frequency band are realized, the smoothness of a rail and a line is ensured, the load of a steel rail is reduced, and the occurrence of abnormal corrugation is inhibited while the expected vibration attenuation target is achieved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a bar is spread periodic cushion damping ballast bed, includes periodic composite ballast bed board and sets up the concrete basement in its below, periodic composite ballast bed board with it is spacing through limit structure between the concrete basement, prevents to take place relative displacement, wherein, periodic composite ballast bed board is formed by concrete slab and periodic cushion from top to bottom alternate arrangement consolidation, constitutes special one-dimensional or two-dimensional scattering type or local resonance type periodic composite ballast bed board, can effectively keep apart vertical and transverse vibration (vertical direction is used as, the driving direction is vertical, the level of perpendicular to driving direction is horizontal). And the projections of the concrete slabs in the vertical direction are completely overlapped; each concrete slab and the adjacent periodic cushion layer below the concrete slab form a basic unit, and the number of periodic repetitions of the basic unit in the vertical direction is not less than 2; the periodic cushion layer is composed of at least one strip-shaped base plate which is continuously expanded and extended along the travelling direction, the width of the base plate is smaller than that of the concrete slab, the laying range of the base plates of the cushion layer in the same period does not exceed the concrete slab, and a cushion layer strip laying form is formed; the projections of the base plates in the interlayer periodic cushion layers are completely overlapped, and the base plates in the adjacent periodic cushion layers are aligned or staggered in the vertical direction to form a one-dimensional or two-dimensional scattering periodic structure.
The backing plates of the cushion layer in each period are arranged symmetrically along the central axis of the circuit.
When the base plates in the adjacent periodic cushion layers are aligned in the vertical direction and only one strip-shaped base plate is symmetrically arranged in the same periodic cushion layer along the central axis of a line, the one-dimensional scattering periodic composite track bed plate is formed and has periodicity and forbidden band characteristics in the vertical direction.
When the base plates in the adjacent periodic cushion layers are aligned in the vertical direction and at least two strip-shaped base plates which are distributed equidistantly and discretely are arranged in the same periodic cushion layer, the two-dimensional scattering periodic composite roadbed slab with the rectangular lattice arrangement mode is formed, and periodicity and forbidden band characteristics are realized in the vertical direction, the transverse direction and the like.
When the base plates in the adjacent periodic cushion layers are arranged in a staggered mode in the vertical direction and at least two strip-shaped base plates which are distributed discretely and equidistantly are arranged in the same periodic cushion layer, the two-dimensional scattering periodic composite roadbed slab in a hexagonal lattice arrangement mode is formed, and periodicity and forbidden band characteristics are arranged in the vertical direction, the transverse direction and the like.
In an embodiment of the invention, a through hole is formed on the periodic composite ballast bed plate, a protrusion part penetrating through the through hole is formed on the concrete substrate, an elastic cushion layer is arranged between the protrusion part and the through hole, the protrusion part and the elastic cushion layer form the limiting structure.
In another embodiment of the invention, continuous protruding parts are formed by extending upwards along the left side and the right side of the concrete substrate, the continuous protruding parts wrap the two sides of the periodic composite ballast bed plate, an elastic cushion layer is arranged between the continuous protruding parts and the two sides of the periodic composite ballast bed plate, and the continuous protruding parts and the elastic cushion layer form the limiting structure.
The periodic cushion layer is an elastic layer, a rigid layer or a composite layer formed by compounding the elastic layer and a complex rigid layer, and the thickness of the periodic composite track bed plate is 0.3-0.54 m.
When the periodic cushion layer is an elastic layer, the sum of the thicknesses of the elastic layers of the multiple periodic cushion layers is less than or equal to 0.04 m.
In addition, the top of the periodic composite track bed plate is provided with continuous or discrete rail bearing platforms along the travelling direction, two sleeves for fixing fasteners are arranged at the positions of the rail bearing platforms corresponding to the fastener holes, and grouting holes are formed in the periodic composite track bed plate at intervals along the length direction.
And the concrete slab and the periodic cushion layer are solidified through mortar or glue seal.
Preferably, when the periodic cushion layer is used on the main track, the strip-shaped base plates which are continuously expanded and extended along the travelling direction in the periodic cushion layer can be arranged at the transverse central position when each layer of single base plate is arranged, cover more than 50% of the transverse width of the track bed plate, and the base plates of all layers are equal in width and are aligned in the vertical direction;
preferably, when the positive line is used, two or more than two strip-shaped base plates which are continuously extended and extended along the traffic direction in the periodic cushion layer are arranged symmetrically along the line central axis.
The vibration-damping obstetric table comprises a one-dimensional periodic structure formed by repeatedly arranging concrete plates and periodic cushion layers along the vertical direction, wherein the initial frequency of a first-stage complete forbidden band is reduced along with the increase of the thicknesses of the concrete plates and the periodic cushion layers, is increased along with the increase of the elastic moduli of the concrete plates and the periodic cushion layers, is reduced along with the reduction of the widths of the periodic cushion layers, and is reduced along with the increase of the impedance ratio, the bandwidth of the first-stage complete forbidden band is widened along with the increase of the thicknesses of the concrete plates, is narrowed along with the increase of the thicknesses of the periodic cushion layers, is widened along with the increase of the elastic moduli of the concrete plates and the periodic cushion layers, is widened along with the reduction of the widths of the periodic cushion layers, and is widened along with the increase of the.
When the periodic cushion layer is made of elastic materials, the width of the periodic cushion layer is reduced, the thicknesses of the concrete plate and the periodic cushion layer are increased, the elastic modulus of the concrete plate and the periodic cushion layer is reduced, the impedance ratio of the concrete plate and the periodic cushion layer is increased, the initial frequency of a first-order complete forbidden band can be effectively reduced, and a better low-frequency vibration isolation effect is generated.
When the periodic cushion layer is made of elastic materials, the width of the periodic cushion layer is reduced, the thickness of the concrete plate is increased, the thickness of the periodic cushion layer is reduced, the elastic modulus of the concrete plate and the periodic cushion layer is increased, the impedance ratio of the concrete plate and the periodic cushion layer is increased, the bandwidth of a first-order complete forbidden band can be increased, and the vibration isolation effect of a wider frequency band is generated.
Through the mode, the periodic composite track bed plate can actively regulate and control by changing the geometrical size and material composition of the concrete plate and the periodic cushion layer structure, can form multi-section forbidden band distribution within 200Hz, the lowest vibration isolation frequency can be as low as 8Hz, and the control bandwidth can be more than 120Hz at most.
The invention is switched in from the forbidden band theory of the periodic structure, innovatively designs the periodic vibration reduction ballast bed, overturns the vibration isolation thought of the traditional structure, and belongs to the category of intelligent structures (materials). Compared with the prior art, the invention has the following outstanding advantages:
(1) the vibration transmission in the vertical and horizontal directions can be effectively controlled;
(2) the bandwidth and the position of a vibration isolation frequency band can be actively adjusted through the artificial design of a periodic structure or a material, the adjustability is strong, the control frequency band can reach below 200Hz, and the control bandwidth can reach above 70 Hz;
(3) the integrated design of bearing and vibration reduction functions can be realized without additionally adding a damper and a main control device, the load of a track system is reduced, and the generation of abnormal corrugation is inhibited;
(4) the input of vibration reduction cost is saved, and the vibration reduction cost can be used as a basic vibration reduction measure for a circuit;
(5) the vibration reduction part moves downwards, so that the measure types are reduced, and the smoothness of the track is ensured.
Drawings
FIG. 1 is a top view of a first embodiment of a strip-paved periodic pad-damped track bed of the present invention;
FIG. 2 is a cross-sectional view A-A of a first embodiment of a strip-paved periodic cushion-damped track bed of the present invention;
FIG. 3 is a schematic view of a first embodiment of a strip-paved periodic cushion vibration-damped track bed of the present invention;
FIG. 4 is a top view of a second embodiment of a strip-paved periodic pad-damped track bed of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of a second embodiment of a strip-paved periodic cushion damped track bed of the present invention;
FIG. 6 is a cross-sectional view B-B of a second embodiment of a strip-paved periodic cushion damped track bed of the present invention;
FIG. 7 is a schematic perspective view of the strip-paved periodic cushion-damped track bed shown in FIGS. 1-3;
FIG. 8 is a forbidden band distribution diagram of a periodic structure in an embodiment.
In the figure:
1. 1-1 parts of periodic composite track bed board, 1-2 parts of concrete slab, 2 parts of periodic cushion layer and concrete base
2a, a limiting structure 3, an elastic cushion layer 4, a rail bearing platform 5, a sleeve 6 and a grouting hole
Detailed Description
To further clarify the technical solutions and effects of the present invention adopted to achieve the intended advantages, the following detailed description of specific embodiments, structures, characteristics and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. The particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The strip-paved periodic cushion shock absorption ballast bed comprises a periodic composite ballast bed plate 1 and a concrete base 2 arranged below the periodic composite ballast bed plate, wherein the periodic composite ballast bed plate 1 and the concrete base 2 are limited through a limiting structure 2a, so that relative displacement is prevented.
The periodic composite track bed plate 1 is formed by alternately arranging and consolidating concrete plates 1-1 and periodic cushion layers 1-2 from top to bottom, forms a special one-dimensional or two-dimensional scattering type or local resonance periodic composite track bed plate, and can effectively isolate vertical and transverse vibration. And the projections of the concrete plates 1-1 of each layer in the vertical direction are completely superposed; each concrete slab and the adjacent periodic cushion layer below the concrete slab form a basic unit, and the number of periodic repetitions of the basic unit in the vertical direction is not less than 2.
The periodic cushion layer 1-2 is composed of at least one strip-shaped base plate which is continuously expanded and extended along the travelling direction, the width of the base plate is smaller than that of the concrete slab, the laying range of the base plates of the cushion layer in the same period does not exceed the concrete slab, and a cushion layer strip laying mode is formed. The projections of the base plates in the interlayer periodic cushion layers are completely overlapped, and the base plates in the adjacent periodic cushion layers are aligned or staggered in the vertical direction to form a one-dimensional or two-dimensional scattering periodic structure
When the base plates in the adjacent periodic cushion layers are aligned in the vertical direction and only one strip-shaped base plate is arranged in the same periodic cushion layer, the one-dimensional scattering periodic composite track bed plate is formed and has periodicity and forbidden band characteristics in the vertical direction.
When the base plates in the adjacent periodic cushion layers are aligned in the vertical direction and at least two strip-shaped base plates which are distributed equidistantly and discretely are arranged in the same periodic cushion layer, the two-dimensional scattering periodic composite roadbed slab with the rectangular lattice arrangement mode is formed, and periodicity and forbidden band characteristics are realized in the vertical direction, the transverse direction and the like.
When the base plates in the adjacent periodic cushion layers are arranged in a staggered mode in the vertical direction and at least two strip-shaped base plates which are distributed discretely and equidistantly are arranged in the same periodic cushion layer, the two-dimensional scattering periodic composite roadbed slab in a hexagonal lattice arrangement mode is formed, and periodicity and forbidden band characteristics are arranged in the vertical direction, the transverse direction and the like.
Preferably, when the steel rail support is used in a positive line, two strip-shaped base plates which are continuously extended and extended along the travelling direction in the periodic cushion layer 1-2 are arranged, one base plate is respectively arranged under each of the two steel rails, and the width of each base plate is the same as or close to that of the rail support table 4.
By the mode, the effect that the periodic cushion layers 1-2 are paved below the concrete slab 1-1 is achieved, vibration energy transmitted by the concrete slab 1-1 is evenly distributed and weakened, and deformation can be coordinated. The top of the periodic composite track bed slab 1 consisting of the concrete slab 1-1 and the periodic cushion layer 1-2 is the concrete slab 1-1, so that the rigid connection and fixation with the steel rail through fasteners are realized.
As an alternative embodiment, the concrete plates 1-1 and the periodic cushion layers 1-2 are alternately and repeatedly arranged along the vertical direction, each concrete plate 1-1 and an adjacent periodic cushion layer 1-2 form a basic unit, and the whole periodic composite track bed plate 1 comprises a basic unit repetition number which can be 3. In this way, the periodic attenuation of the vibrational energy can be effectively controlled.
The backing plate in the periodic cushion layer 1-2 can be an elastic layer such as rubber and polyurethane; rigid layers such as steel plates; the composite layer formed by elastic composite rigidity also requires that the periodic cushion layer 1-2 and the concrete slab 1-1 form a larger impedance ratio. By the mode, larger impedance steps can be formed on different medium interfaces, so that vibration is greatly attenuated.
As an alternative embodiment, when the sum of the thicknesses of the plurality of basic cells is between 0.3m and 0.54m, and the periodic cushion layer 1-2 is an elastic material layer, the sum of the thicknesses of the elastic layers in the multi-layer periodic cushion layer 1-2 should not exceed 0.04 m.
Preferably, mortar or glue sealing is adopted between the concrete slab 1-1 and the periodic cushion layer 1-2, and the concrete slab and the periodic cushion layer are bonded and solidified. By the method, the strip-paved periodic cushion layer vibration reduction ballast bed can meet the requirements on building clearance and rigidity and displacement of a track system.
In the embodiments shown in fig. 1-3 and 7, a through hole is formed on the periodic composite track bed plate 1, a protrusion 2a penetrating through the through hole is formed on the concrete base 2, an elastic cushion layer 3 is arranged between the protrusion 2a and the through hole, the protrusion and the elastic cushion layer form the limiting structure. In the embodiment shown in fig. 4-6, the continuous protrusions 2a are formed by extending upwards along the left and right sides of the concrete base 2, the continuous protrusions wrap the two sides of the periodic composite track bed plate 1, the elastic cushion layer 3 is arranged between the continuous protrusions and the two sides of the periodic composite track bed plate, and the continuous protrusions and the elastic cushion layer form the limiting structure. The limiting structure not only plays a role of foundation, but also plays a role of limiting the side movement or longitudinal sliding of the periodic composite track bed board 1; the elastic cushion layer 3 can be made of rubber, polyurethane and the like, and can reduce impact force.
As an alternative embodiment, a raised rail bearing platform 4 is arranged on the top of the periodic composite track bed slab 1 along the traveling direction, the rail bearing platform 4 can be continuous or discrete, and the rail bearing platform 4 in a discrete type is adopted in the embodiments shown in fig. 1 to 6. The center distance between the adjacent rail bearing platforms 4 is 0.6 m. The rail bearing table 4 is provided with two sleeves 5 at corresponding positions of each fastener for fixing the fasteners, and the sleeves 5 are located on diagonal positions of the surface of the rail bearing table 4. Grouting holes 6 are sequentially arranged on the periodic composite track bed board 1 along the driving direction, and the holes are arranged at equal intervals.
As an optional implementation manner, the periodic composite track bed plate 1 is a two-dimensional periodic structure, and can form an elastic wave forbidden band, and vibration within the forbidden band will be greatly attenuated, that is, a vibration attenuation frequency band is formed, so that vertical and transverse vibration is effectively suppressed. When the periodic cushion layer 1-2 is an elastic cushion layer, in order to reduce the initial frequency of the first-order complete forbidden band, the width of the periodic cushion layer 1-2 can be reduced, the thicknesses of the concrete slab 1-1 and the periodic cushion layer 1-2 can be increased, and the elastic moduli of the concrete slab 1-1 and the periodic cushion layer 1-2 can be reduced; in order to increase the bandwidth of the first-order complete forbidden band, the width of the periodic cushion layer 1-2 can be reduced, the thickness of the concrete slab 1-1 can be increased, the thickness of the periodic cushion layer 1-2 can be reduced, the elastic modulus of the concrete slab 1-1 and the periodic cushion layer 1-2 can be increased, and the impedance ratio of the concrete slab 1-1 and the periodic cushion layer 1-2 can be increased.
The strip-paved periodic cushion damping ballast bed should meet the related requirements of subway design clearance, bearing capacity, displacement and durability.
Examples
The width of the concrete slab 1-1 and the width of the periodic cushion layer 1-2 are 2.2m, the thickness of the concrete slab 1-1 is 0.1m, the thickness of the periodic cushion layer 1-2 is 0.01m, the width of the periodic cushion layer is 0.4m, the concrete slab 1-1 and the periodic cushion layer 1-2 are alternately repeated from top to bottom, and the repetition is respectively carried out for 3 times, so that the periodic composite track bed plate with the thickness of 0.33m is formed. The thickness of the base of the concrete base and limiting structure 2 is 0.15m, and the height of the protrusion is 0.33 m.
In the embodiment shown in fig. 1-3, the discrete projections 2a have a cross-sectional dimension of 0.4m x 0.5m (0.5m being the dimension in the direction of travel of the line).
In the embodiment shown in FIGS. 4 to 6, the continuous protrusions 2a have a longitudinal cross-sectional dimension of 0.33 m.times.0.4 m (0.4m is a dimension perpendicular to the running direction of the road).
The elastic cushion layer 3 is made of rubber and has the thickness of 0.02 m. The base plate in each layer of periodic cushion layer 1-2 is in a strip paving mode, one base plate is arranged below each of the two steel rails, and the width of the base plate is equal to the width of the periphery of the rail bearing platform 4.
The nearest center distance of the rail bearing platform 4 arranged along the line direction is 0.6m, the nearest center distance perpendicular to the line direction is 1.513m, the nearest center distance is 0.03m higher than the top surface of the periodic composite track bed board 1, the cross section size is 0.3m multiplied by 0.2m (0.2m is the running direction of the line), and a flat slope scheme is adopted. The distance between the two sleeves 5 on the same rail bearing platform 4 along the running direction of the line is 0.125m, and the distance along the running direction of the vertical line is 0.284 m. And the grouting holes 6 are round holes with the diameter of 0.17 m. The concrete slab 1-1 is made of C60 concrete, and the concrete base and limiting structure 2 is made of C40 self-compacting concrete.
Fig. 8 is a forbidden band distribution diagram of the periodic structure corresponding to the two embodiments, where two wide-band forbidden band distributions appear in 200Hz ranges, such as 53-148 Hz and 151-200 Hz, and the vibration in the forbidden band ranges is greatly attenuated.
The vibration-damping track bed is not only suitable for a straight line section but also suitable for a curve section. For a curved road section, it is required that in the longitudinal section of the mat layer of each period, the tie plates are symmetrically arranged with respect to the center line of the rail.
The present embodiment is only for explaining the present invention, and the dimension and material setting of the strip-paved periodic cushion shock-absorbing ballast bed are multiple, and not limited to the present embodiment, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, as long as they are protected by the patent laws within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a strip pavement cycle bed course damping railway roadbed which characterized in that: comprises a periodic composite track bed plate and a concrete base arranged below the periodic composite track bed plate, wherein the periodic composite track bed plate and the concrete base are limited by a limiting structure to prevent relative displacement, wherein,
the periodic composite ballast bed plate is formed by concrete plates and periodic cushion layers which are alternatively arranged and consolidated from top to bottom, and the projections of the concrete plates in the vertical direction are completely overlapped; each concrete slab and the adjacent periodic cushion layer below the concrete slab form a basic unit, and the number of periodic repetitions of the basic unit in the vertical direction is not less than 2;
the periodic cushion layer is composed of at least one strip-shaped base plate which is continuously expanded and extended along the travelling direction, the width of the base plate is smaller than that of the concrete slab, the laying range of the base plates of the cushion layer in the same period does not exceed the concrete slab, and a cushion layer strip laying form is formed;
the projections of the base plates in the interlayer periodic cushion layers are completely overlapped, and the base plates in the adjacent periodic cushion layers are aligned or staggered in the vertical direction to form a one-dimensional or two-dimensional scattering periodic structure.
2. The strip-paved periodic cushion vibration-damped track bed according to claim 1, wherein: the base plates in the adjacent periodic cushion layers are aligned in the vertical direction, and only one strip-shaped base plate is symmetrically arranged in the same layer of periodic cushion layer along the central axis of the line to form the one-dimensional scattering periodic composite track bed plate.
3. The strip-paved periodic cushion vibration-damped track bed according to claim 1, wherein: the base plates in the adjacent periodic cushion layers are aligned in the vertical direction, and at least two strip-shaped base plates which are distributed equidistantly and discretely are arranged in the same periodic cushion layer to form the two-dimensional scattering periodic composite track bed plate in a rectangular lattice arrangement mode.
4. The strip-paved periodic cushion vibration-damped track bed according to claim 1, wherein: the base plates in the adjacent periodic cushion layers are arranged in a staggered mode in the vertical direction, and at least two strip-shaped base plates which are distributed discretely at equal intervals are arranged in the same periodic cushion layer to form the hexagonal lattice arrangement type two-dimensional scattering periodic composite ballast bed plate.
5. The strip-paved periodic cushion vibration-damped track bed according to claim 1, wherein: the periodic composite roadbed slab is provided with a through hole, a bulge passing through the through hole is formed on the concrete substrate, an elastic cushion layer is arranged between the bulge and the through hole, the bulge and the elastic cushion layer form the limiting structure.
6. The strip-paved periodic cushion vibration-damped track bed according to claim 1, wherein: the concrete foundation comprises a concrete base, a periodic composite roadbed plate, elastic cushion layers and a limiting structure, wherein the concrete base is arranged on the upper portion of the concrete base, the left side and the right side of the concrete base extend upwards to form continuous protruding portions, the continuous protruding portions wrap the two sides of the periodic composite roadbed plate, the elastic cushion layers are arranged between the continuous protruding portions and the two sides of the periodic composite roadbed plate, and the continuous protruding portions and the elastic cushion layers form the limiting structure.
7. The strip-paved periodic cushion shock-absorbing road bed according to any one of claims 1 to 6, wherein: the periodic cushion layer is an elastic layer, a rigid layer or a composite layer formed by compounding the elastic layer and a complex rigid layer, and the thickness of the periodic composite track bed plate is 0.3-0.54 m.
8. The strip-paved periodic cushion vibration-damped track bed according to claim 7, wherein: the periodic cushion layers are elastic layers, and the sum of the thicknesses of the elastic layers of the multiple periodic cushion layers is less than or equal to 0.04 m.
9. The strip-paved periodic cushion vibration-damped track bed according to claim 8, wherein: the top of the periodic composite track bed plate is provided with continuous or discrete rail bearing platforms along the travelling direction, two sleeves for fixing fasteners are arranged at the positions of the rail bearing platforms corresponding to the fastener holes, and grouting holes are formed in the periodic composite track bed plate at intervals along the length direction.
10. The strip-paved periodic cushion vibration-damped track bed according to claim 9, wherein: and the concrete slab and the periodic cushion layer are solidified through mortar or glue seal.
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| 邢俊: "基于声子晶体的地铁轨道弹性垫层波阻单元设计研究", 《工程科技Ⅱ辑》 * |
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