CN112626931A - Vibration-damping roadbed with periodic cushion layer for spot paving - Google Patents
Vibration-damping roadbed with periodic cushion layer for spot paving Download PDFInfo
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- CN112626931A CN112626931A CN202011523231.2A CN202011523231A CN112626931A CN 112626931 A CN112626931 A CN 112626931A CN 202011523231 A CN202011523231 A CN 202011523231A CN 112626931 A CN112626931 A CN 112626931A
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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 provides a point-paved periodic cushion shock absorption ballast bed which comprises a periodic composite ballast bed plate and a concrete base arranged below the periodic composite ballast bed plate, wherein the periodic composite ballast bed plate and the concrete base are limited by a limiting structure to prevent relative displacement, the periodic composite ballast bed plate is formed by alternately arranging and consolidating concrete slabs and periodic cushion layers from top to bottom, 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 formed by the fact that square base plates are distributed in a scattered mode along the driving direction according to rules. The damping ballast bed forms elastic wave forbidden bands in the vertical direction, the transverse direction and the longitudinal direction, can effectively control the propagation of vibration in three directions, can actively adjust the forbidden band range by changing the structural geometric dimension and the material composition, and has strong adjustability.
Description
Technical Field
The invention relates to the field of vibration and noise reduction of rail transit, in particular to a point-paved periodic cushion vibration-damping ballast bed.
Background
At present, the rail vibration reduction measures widely adopted for rail transit environment vibration control 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 report is available for periodically designing structures involved in rail transit by using the forbidden band characteristic of a periodic structure and realizing active regulation and control of vibration.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a point-spread 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:
a point-paved periodic cushion layer vibration damping ballast bed comprises a periodic composite ballast bed plate and a concrete base arranged below the periodic composite ballast bed plate, wherein the periodic composite ballast bed plate and the concrete base are limited through a limiting structure to prevent relative displacement, the periodic composite ballast bed plate is formed by alternately arranging and solidifying concrete slabs and periodic cushion layers from top to bottom, 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 formed by the discrete distribution of square base plates along the driving direction according to a rule, and the size along the driving direction (longitudinal direction) is taken as the length, the size along the vertical direction is taken as the thickness (height), and the size along the transverse direction is taken as the width; the width of the backing plate is smaller than that of the concrete slab, one or more backing plates in the same period of backing layer are transversely arranged, the laying range does not exceed the concrete slab, and a backing layer point laying mode is formed; the projections of the periodic cushion layers on the interlayer are completely overlapped; the periodic cushion layers of the adjacent layers are aligned in the vertical direction, or are arranged in a staggered mode in the transverse direction and/or the longitudinal direction and are symmetrically arranged along the central line of the line, so that a two-dimensional scattering type or local resonance type periodic structure in a rectangular lattice arrangement mode is formed, and vertical, transverse and longitudinal vibration can be effectively isolated.
Preferably, when the positive line is used, square backing plates which are discretely distributed according to a certain rule in the periodic cushion layer along the driving direction can be arranged at the horizontal central position when being in a single row, and cover more than 50% of the transverse width of the roadbed slab, the interlayer backing plates are equal in width and ensure that the backing plates of the interlayers are aligned in the vertical direction, the backing plates of adjacent layers can be longitudinally staggered, and the backing plates of the same layer are symmetrical along the central line of the line, so that the smoothness of the line is ensured.
Preferably, when the positive line is used, when the square backing plate that the dispersion distributes according to certain law in the cycle bed course is two and more, can respectively arrange one under two rail, width, length with the rail supporting platform is the same width, the same length or meet closely, be located under backing plate rail supporting platform, also can be located under two rail supporting platform middles, the interlayer backing plate is the same width and guarantees that the interlayer is vertical to be aimed at, and adjacent layer backing plate can be along violently, vertically misplacing, and the same layer backing plate line central line symmetry ensures the circuit ride comfort.
When the adjacent periodic cushion layers are aligned in the vertical direction and only one row of square base plates in the same periodic cushion layer are arranged along the travelling direction, the periodic composite ballast bed plate is of a two-dimensional scattering type or local resonance type periodic structure in a rectangular lattice arrangement mode and has periodicity and forbidden band characteristics in the vertical direction and the longitudinal direction;
when the periodic cushion layers of the adjacent layers are not aligned in the vertical direction (longitudinally staggered) and only one row of square base plates in the periodic cushion layer of the same layer are arranged along the traveling direction, the periodic composite track bed plate is of a two-dimensional scattering type or local resonance type periodic structure in a hexagonal lattice arrangement mode and has periodicity and forbidden band characteristics in the vertical direction and the longitudinal direction;
when more than one row of square base plates are arranged in the same layer of periodic cushion layer along the traveling direction, the periodic composite track bed plate is a long) cubic lattice arrangement type three-dimensional scattering type or local resonance type periodic structure, and periodicity and forbidden band characteristics are arranged in the vertical direction, the longitudinal direction, the transverse direction and the like.
In an embodiment of the invention, a through hole is formed on the periodic composite track 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 and are used for limiting the periodic composite track bed plate to laterally move or longitudinally slide, and the elastic cushion layer is used for relieving impact force.
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 forms a larger impedance ratio with the concrete slab, and can be an elastic layer such as rubber and polyurethane; rigid layers such as steel plates; the composite layer may be a composite layer formed by combining an elastic layer and a multiple rigid layer.
It is preferable that the thickness (sum of thicknesses of a plurality of basic units) of the periodic composite track bed is 0.3m to 0.54 m.
When the periodic cushion layer is an elastic layer, the sum of the thicknesses of the elastic layers of the multi-layered periodic cushion layer should not exceed 0.04 m.
In addition, a continuous or discrete rail bearing platform is arranged at the top of the periodic composite track bed slab along the travelling direction and serves as a bearing structure of the steel rail. Two sleeves for fixing the fasteners are arranged at the positions of the fastener holes corresponding to each rail bearing platform, and grouting holes are formed in the periodic composite track bed plate at intervals along the length direction.
Preferably, the concrete slab is consolidated with the periodic underlayment by mortar or glue seals.
According to the vibration-damping ballast bed, when the periodic cushion layer is made of elastic materials, the width of the periodic cushion layer is reduced, the length of thin cushion plates in the periodic cushion layer is reduced, the distance between two adjacent thin cushion plates in the periodic cushion layer along the traveling direction is increased, 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 length of thin cushion plates in the periodic cushion layer is reduced, the distance between two adjacent thin cushion plates in the periodic cushion layer along the traveling direction 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.
The invention carries out the design of the periodic vibration reduction ballast bed based on the periodic structure forbidden band theory, overturns the traditional structure vibration isolation thought, belongs to the intelligent structure (material) category, and has the following outstanding advantages:
(1) the vibration transmission in the vertical direction, the transverse direction and the longitudinal direction can be effectively controlled;
(2) the bandwidth and the position of a vibration isolation frequency band can be actively adjusted by changing the structural geometric dimensions and the material composition of the concrete slab and the periodic cushion layer, the adjustability is strong, multi-section forbidden band distribution can be formed within 200Hz, the lowest vibration isolation frequency can be as low as 5Hz, and the control bandwidth can be up to more than 135Hz at most;
(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 point-spread periodic pad-damped track bed of the present invention;
FIG. 2 is a cross-sectional view taken along line A-A of a first embodiment of a point-spread-cycle-pad-damped ballast bed of the present invention;
FIG. 3 is a front view of a first embodiment of a point-spread periodic pad damped track bed of the present invention;
FIG. 4 is a top view of a second embodiment of a point-spread 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 point-spread-periodic-pad-damped ballast bed of the present invention;
FIG. 6 is a side cross-sectional view B-B of a second embodiment of a point-spread-cycle-pad-damped track bed of the present invention;
FIG. 7 is a top view of a third embodiment of a point-paved periodic pad-damped track bed of the present invention;
FIG. 8 is a cross-sectional view A-A of a third embodiment of a point-spread-cycle cushioned shock-absorbing ballast bed of the present invention;
FIG. 9 is a side view of a third embodiment of a point-paved periodic pad-damped track bed of the present invention;
FIG. 10 is a top view of a fourth embodiment of a point-spread periodic pad damped track bed of the present invention;
FIG. 11 is a cross-sectional view A-A of a fourth embodiment of a point-spread-cycle cushioned shock absorption track bed in accordance with the present invention;
FIG. 12 is a side cross-sectional view B-B of a fourth embodiment of a point-spread-cycle cushioned shock absorption ballast bed of the present invention;
fig. 13 is a forbidden band distribution diagram of the periodic structure in the embodiment of the invention.
In the figure:
1. a periodic compound ballast bed plate; 1-1, concrete slab; 1-2, periodic cushion layer; 2. a concrete base; 2a, a limiting structure;
3. an elastic cushion layer; 4. a rail bearing platform; 5. a sleeve; 6. 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, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, the particular features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
The point-paved periodic cushion layer vibration-damping ballast bed comprises a two-dimensional or three-dimensional scattering type or local resonance type periodic composite ballast bed plate 1 formed by alternately and repeatedly arranging concrete plates 1-1 and periodic cushion layers 1-2 in the vertical direction, and the periodic or local resonance type periodic composite ballast bed plate has periodicity and forbidden band characteristics in the vertical direction, the transverse direction and the longitudinal direction and can effectively isolate vertical vibration, transverse vibration and longitudinal vibration.
A concrete substrate 2 is arranged below the periodic composite track bed plate 1, and the periodic composite track bed plate 1 and the concrete substrate 2 are limited through a limiting structure 2a to prevent relative displacement; the upper surface of the periodic composite track bed plate 1 is provided with a track bearing platform 4 and a grouting hole 6, the track bearing platform 4 is provided with a sleeve 5, and an elastic cushion layer 3 is arranged between the periodic composite track bed plate 1 and the limiting structure 2 a.
The periodic cushion layer 1-2 is formed by discretely distributing square thin cushion plates according to a certain rule along the traveling direction, taking the size along the traveling direction (longitudinal direction) as length, the size along the vertical direction as thickness (height) degree and the width along the transverse dimension as width, the width of the thin cushion plate is smaller than the width of a concrete slab 1-1, a plurality of cushion plates can be discretely distributed along the transverse direction of the cushion layer 1-2 in the same period, the laying range does not exceed the concrete slab 1-1, and a cushion layer point laying effect is formed.
When the cushion plate is used on the main line, when square thin-layer cushion plates which are discretely distributed according to a certain rule (can be distributed at equal intervals or can be distributed discretely according to the rule) in the periodic cushion layers 1-2 along the driving direction are in a single row, the square thin-layer cushion plates can be arranged at the transverse central position and cover more than 50% of the transverse width of the ballast bed plate, the interlayer cushion plates are equal in width and ensure that the interlayer is aligned in the vertical direction, the cushion plates on adjacent layers can be longitudinally staggered, and the cushion plates on the same layer are symmetrical along the central line of the line, so that the smoothness of the line.
When the periodic cushion layer 1-2 is used on the main line, when the square thin-layer cushion plates distributed discretely according to a certain rule in the traveling direction are 2 rows or more, one row can be respectively arranged under two steel rails, the width and the length of the square thin-layer cushion plates are the same as those of the rail bearing table 4, the square thin-layer cushion plates are close to those of the rail bearing table 4, and the square thin-layer cushion plates can be positioned under the rail bearing table 4. Or just below the middle of the two rail bearing platforms 4, as shown in the two embodiments of fig. 7 to 12. The base plates of the interlayers are equal in width and the base plates of the interlayers are aligned in the vertical direction, the base plates of adjacent layers can be staggered in the transverse direction and the longitudinal direction, and the base plates of the same layer are symmetrical along the central line of the circuit so as to ensure the smoothness of the circuit. The top of the periodic composite track bed plate 1 is provided with a concrete plate 1-1, so that rigid connection and fixation with the steel rail through a fastener are realized. Each concrete slab 1-1 and an adjacent periodic bedding layer 1-2 form a basic unit, and the whole periodic composite track bed slab 1 comprises a basic unit repetition number of at least 2, and in the embodiment shown in fig. 1-12, the basic unit repetition number is 3.
By the mode, the effect that the periodic cushion layer 1-2 is 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.
In the embodiment shown in fig. 1 and 7, a through hole is formed in the periodic composite track bed plate, a protrusion 2a penetrating through the through hole is formed on the concrete substrate, an elastic cushion layer 3 is arranged between the protrusion and the through hole, the protrusion and the elastic cushion layer form the limiting structure and are used for limiting the periodic composite track bed plate to laterally move or longitudinally slide, and the elastic cushion layer is used for reducing impact force.
In the embodiment shown in fig. 4 and 10, the continuous protrusions 2a are formed by extending upwards along the left and right sides of the concrete base, the continuous protrusions wrap the two sides of the periodic composite track bed plate, an elastic cushion layer 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.
When the periodic cushion layers 1-2 of adjacent layers are aligned in the vertical direction and only one row of square cushion plates in the periodic cushion layers 1-2 of the same layer are arranged along the traveling direction, the periodic composite track bed plate 1 is a two-dimensional scattering type or local resonance type periodic structure in a rectangular lattice arrangement mode and has periodicity and forbidden band characteristics in the vertical direction and the longitudinal direction;
when the adjacent periodic cushion layers 1-2 are not aligned in the vertical direction (longitudinally staggered) and only one row of square base plates in the same periodic cushion layer 1-2 are arranged along the travelling direction, the periodic composite ballast bed plate 1 is a two-dimensional scattering type or local resonance type periodic structure in a hexagonal lattice arrangement mode and has periodicity and forbidden band characteristics in the vertical direction and the longitudinal direction;
when more than one row of square base plates are arranged in the same layer of periodic cushion layer 1-2 along the driving direction, the periodic composite track bed plate 1 is a three-dimensional scattering type or local resonance type periodic structure in a cuboid lattice arrangement mode, and has periodicity and forbidden band characteristics in the vertical direction, the longitudinal direction, the transverse direction and other three directions.
By the mode, the vibration energy can be effectively controlled through periodical attenuation.
The periodic cushion layer is an elastic layer such as rubber and polyurethane, or a rigid layer such as a steel plate, or a composite layer formed by elastic composite rigidity, and the periodic cushion layer 1-2 and the concrete slab 1-1 are required to form a larger impedance ratio.
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 includes an elastic material layer, the sum of the thicknesses of the elastic layers in the multi-layered 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 mode, the point-paved periodic cushion layer damping roadbed can meet the requirements of building clearance, rigidity of a track system and displacement.
As an optional embodiment, a raised rail bearing platform 4 is arranged on the top of the periodic composite track bed plate 1 along the traveling direction, the rail bearing platform 4 can be continuous or discrete, in the first embodiment to the fourth embodiment, a discrete type rail bearing platform 4 is adopted, the raised part can be in a shape of a thin layer cuboid, and the adjacent center distance of the rail bearing platforms 4 is 0.6 m. As an alternative embodiment, the rail bearing platform 4 is provided with two sleeves 5 at the corresponding position of each fastener for fixing the fastener, and the sleeves 5 are positioned at the diagonal positions of the surface of the rail bearing platform 4. As an optional implementation mode, grouting holes 6 are sequentially arranged on the upper surface of the periodic composite track bed board 1 along the traveling direction, and the holes are arranged at equal intervals. As alternative embodiments, the periodic cushion layer 1-2 may be an elastic layer such as rubber, 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.
The periodic composite track bed board 1 can form an elastic wave forbidden band, and vibration within the forbidden band range is greatly attenuated, namely a vibration attenuation frequency band is formed, so that vertical and transverse vibration is effectively inhibited.
As an optional embodiment, 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 thereof and generate a better low-frequency vibration isolation effect, the width of the periodic cushion layer 1-2 can be reduced, the length of a thin-layer cushion plate in the periodic cushion layer 1-2 can be reduced, the distance between two adjacent thin-layer cushion plates in the periodic cushion layer 1-2 along the direction of a traveling crane can be increased, the thicknesses of the concrete slab 1-1 and the periodic cushion layer 1-2 can be increased, the elastic moduli of the concrete slab 1-1 and the periodic cushion layer 1-2 can be reduced, the impedance ratio of the concrete slab 1-1 and the periodic cushion layer 1-2 can be increased, and the initial frequency of the first-order complete forbidden band can be effectively reduced, that is, so that a;
as an alternative embodiment, when the periodic cushion layer 1-2 is an elastic cushion layer, in order to increase the bandwidth of the first-order complete forbidden band, that is, to generate a wider-band vibration isolation effect, the width of the periodic cushion layer 1-2 may be reduced, the length of the thin-layer cushion plate in the periodic cushion layer 1-2 may be reduced, the distance between two adjacent thin-layer cushion plates in the periodic cushion layer 1-2 along the direction of the traveling vehicle may be reduced, the thickness of the concrete slab 1-1 may be increased, the thickness of the periodic cushion layer 1-2 may be reduced, the elastic modulus of the concrete slab 1-1 and the periodic cushion layer 1-2 may be increased, and the impedance ratio of the concrete slab 1-1 and the periodic cushion layer 1-2 may.
Through the mode, the periodic composite roadbed slab 1 can form multi-section forbidden band distribution within 200Hz by actively regulating and controlling the structural geometric dimension and material composition of the concrete slab 1-1 and the periodic cushion layer 1-2, the lowest vibration isolation frequency can be as low as 5Hz, and the control bandwidth can be as high as 146 Hz.
The point-spread periodic cushion layer damping track bed should meet the related requirements of subway design clearance, bearing capacity, displacement and durability.
Example one
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 0.2m, the length of the periodic cushion layer is 0.2m, and in the first embodiment and the second embodiment, the periodic cushion layer is arranged under the rail bearing platform 4; in the third and fourth embodiments, the support rail is arranged right below the middle of the two adjacent rail bearing platforms 4. The concrete slabs 1-1 and the periodic cushion layers 1-2 are alternately repeated from top to bottom for 3 times respectively to form a periodic composite ballast bed plate 1 with the thickness of 0.33 m. The thickness of the base of the concrete base and limiting structure 2 is 0.15m, the height of the protrusions is 0.33m, and in the first and third embodiments, the cross-sectional dimension of the discrete protrusions is 0.4m × 0.5m (0.5m is the dimension along the line running direction); in the second and fourth embodiments, the continuous projections have a longitudinal cross-sectional dimension of 0.33m × 0.4m (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 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. 7 is a forbidden band distribution diagram of the periodic structure corresponding to the above embodiment, where wide-band forbidden band distributions appear at 44-86 Hz and 88-234 Hz, and the vibration within the forbidden band range will be greatly attenuated.
The present embodiment is only for explaining the present invention, and the size and material setting of the spot-paving periodic cushion damping track 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 point is spread periodic cushion 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 layers are distributed in a scattered manner by square base plates along the driving direction according to a regular rule, the width of each base plate is smaller than that of the concrete slab, one or more base plates in the same periodic cushion layer are transversely arranged, the laying range does not exceed the concrete slab, and a cushion layer point laying mode is formed;
the projections of the periodic cushion layers on the interlayer are completely overlapped; the periodic cushion layers of the adjacent layers are aligned in the vertical direction, or are arranged in a staggered mode in the transverse direction and/or the longitudinal direction and are symmetrically arranged along the central line of the line, so that a two-dimensional scattering type or local resonance type periodic structure in a rectangular lattice arrangement mode is formed.
2. The point-spread periodic pad-damped ballast bed of claim 1, wherein: the periodic cushion layers of the adjacent layers are aligned in the vertical direction, and each layer of periodic cushion layer is only discretely arranged along the driving direction by one row of cushion plates to form the periodic composite track bed plate with periodicity and forbidden band characteristics in the vertical direction and the longitudinal direction.
3. The point-spread periodic pad-damped ballast bed of claim 1, wherein: the periodic cushion layers of the adjacent layers are staggered in the vertical direction, and each layer of periodic cushion layer is only discretely arranged along the traveling direction by a row of square cushion plates to form a two-dimensional scattering type or local resonance type periodic structure in a hexagonal lattice arrangement mode.
4. The point-spread periodic pad-damped ballast bed of claim 1, wherein: the periodic cushion layer of the same layer is arranged by at least two lines of square cushion plates along the travelling direction to form a three-dimensional scattering type or local resonance type periodic structure in a cuboid lattice arrangement mode.
5. The point-spread periodic pad-damped ballast bed of 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 point-spread periodic pad-damped ballast bed of 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 point-spread periodic pad-damped track 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 point-spread periodic pad-damped ballast bed of 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 point-spread periodic pad-damped ballast bed of 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 point-spread periodic pad-damped ballast bed of claim 9, wherein: and the concrete slab and the periodic cushion layer are solidified through mortar or glue seal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108119588A (en) * | 2017-12-21 | 2018-06-05 | 西北工业大学 | A kind of low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic |
| CN109961774A (en) * | 2019-04-23 | 2019-07-02 | 东南大学 | A kind of male-type periodic structure plate with graded index |
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2020
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|---|---|---|---|---|
| EP0751257A2 (en) * | 1995-05-18 | 1997-01-02 | Transformados Del Norte, S.A. | Improved pan for railway line double-block sleepers |
| CN102383343A (en) * | 2011-08-17 | 2012-03-21 | 东南大学 | Damping vibration-isolating compound track bed for metro and construction method thereof |
| KR20150125307A (en) * | 2014-04-30 | 2015-11-09 | (주)청도코퍼레이션 | floating railway track of vibration-proofing using precast panel |
| CN104594137A (en) * | 2014-12-01 | 2015-05-06 | 同济大学 | Urban rail transit shock absorption type floating slab rail system |
| CN206245139U (en) * | 2016-10-15 | 2017-06-13 | 陕西长美科技有限责任公司 | precast slab ballast bed |
| CN108119588A (en) * | 2017-12-21 | 2018-06-05 | 西北工业大学 | A kind of low frequency wideband vibration suppression structure based on binary cycle forbidden band characteristic |
| CN109961774A (en) * | 2019-04-23 | 2019-07-02 | 东南大学 | A kind of male-type periodic structure plate with graded index |
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