CN114960302A - Assembled ballastless track structure of high-speed railway and construction method - Google Patents
Assembled ballastless track structure of high-speed railway and construction method Download PDFInfo
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- CN114960302A CN114960302A CN202210421450.2A CN202210421450A CN114960302A CN 114960302 A CN114960302 A CN 114960302A CN 202210421450 A CN202210421450 A CN 202210421450A CN 114960302 A CN114960302 A CN 114960302A
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- ballastless track
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
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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
- E01B9/00—Fastening rails on sleepers, or the like
- E01B9/68—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
- E01B9/681—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by the material
- E01B9/683—Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by the material layered or composite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Railway Tracks (AREA)
- Vibration Prevention Devices (AREA)
Abstract
A high-speed railway assembled ballastless track structure and a construction method thereof comprise ballastless track unit modules, vibration damping leveling layers and limiting connecting rods; the ballastless track unit modules are of prefabricated structures and are laid on the vibration-damping leveling layer in an end-to-end connection mode, and the ballastless track unit modules are fixed on the supporting structure through the limiting connecting rods. The prefabricated module is miniaturized, standardized in design, industrialized in production, simple and mechanized in installation and leveling, and has the characteristics of high precision, few diseases, good vibration reduction, long service life, energy conservation, environmental friendliness, easiness in maintenance and the like.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a fabricated ballastless track structure of a high-speed railway and a construction method.
Background
The rail structure is used as a material carrier for train operation, the service safety of the rail structure directly influences the operation safety of the train, the stress of the rail structure in the service process is very complex, and the rail structure has an important position in the railway safety operation.
The ballastless track structure has become the main track structure type of the high-speed railway due to the advantages of high smoothness, high stability, less maintenance and the like. The ballastless track types applied in China at present mainly comprise double-block type, CRTS I type plate type, CRTS II type plate type and CRTS III type plate type and other structural forms, and the common structural form comprises a track plate, a filling layer, a concrete base or a supporting layer. The vertical multi-layer and longitudinal heterogeneous belt-shaped structure system has the characteristics of large difference of building material attributes, multiple structural layers, complex service environment and building process and the like. Under the long-term repeated action of multi-environment and multi-action coupling, different disease phenomena such as component damage, interface crack slurry leakage, track slab arching and the like occur, and the disease presents the characteristics of mass outburst, burst, repeated outburst and the like along with the lengthening of operation time, so that the safe service, the driving comfort and the maintenance difficulty of the track structure are influenced. The practice of high-speed railways shows that the problem of diseases of ballastless tracks is closely related to factors such as the form of track structures, reverse construction process, large-scale wet operation on site and the like. Therefore, the basic mechanism and the rule of a ballastless track structure in a whole life cycle need to be explored urgently, and a novel ballastless track structure which is high in precision, less in diseases, long in service life, energy-saving, environment-friendly and easy to maintain is invented.
Disclosure of Invention
The invention provides the assembled ballastless track structure of the high-speed railway and the construction method thereof, which solve the defects of the prior art, and have the advantages of quick construction, simple and convenient construction, convenient maintenance, high quality and long service life.
In order to achieve the purpose, the invention firstly provides an assembled ballastless track structure of a high-speed railway, which comprises ballastless track unit modules, a vibration-damping leveling layer and a limiting connecting rod piece; the ballastless track unit modules are of prefabricated structures and are laid on the vibration-damping leveling layer in an end-to-end connection mode, and the ballastless track unit modules are fixed on the supporting structure through the limiting connecting rods.
By adopting the structure, the top surface smoothness is controlled by paving the vibration reduction leveling layer on the track supporting structure when the ballastless track unit module is paved, and the secondary leveling of the track on the ballastless track unit module is realized; the ballastless track unit module realizes primary leveling of the track when being prefabricated in a factory, realizes secondary fine leveling on site through the prepressing vibration attenuation leveling layer, has higher construction efficiency, and avoids the problem of interlayer interface diseases caused by 'reverse construction method' construction.
In addition, the assembly of the ballastless track structure is realized through the assembly and combination of prefabricated ballastless track unit modules, on one hand, the applicability is strong, the ballastless track unit modules are convenient to transport, the assembly method is simple and efficient, on the other hand, the maintenance and the replacement are convenient when the track structure is damaged, only the damaged ballastless track unit modules need to be replaced or maintained during the maintenance and the replacement, the rapid repair can be realized, the replacement is simple, the maintenance cost is low, the period required by the maintenance is short, the labor intensity of workers is low, and the assembly method is more suitable for the requirement of the maintenance of the high-speed railway in the skylight period.
In this embodiment, the vibration damping leveling layer is a cement blanket. The cement blanket in the embodiment is a three-dimensional space fabric reinforced cement-based composite material; the cement blanket is soft in material, can be laid into any shape, does not need stirring and mould forming, and is hardened by dry powder filling and water spraying. The vibration reduction leveling layer is used for supporting the ballastless track unit module and is used for applying pre-pressure to the upper ballastless track unit module in the hydration to hardening process to realize fine leveling of the ballastless track.
In this embodiment, the ballastless track unit module includes a track slab and a track supporting platform fixed on the track slab. In the embodiment, the ballastless track unit module is prefabricated and molded by a factory, the processing is simple, and the manufacturing precision is high.
In this embodiment, the limit connecting rod piece comprises a built-in limit boss;
the built-in limiting boss comprises an elastic connecting ring, a limiting compression ring, a damping connecting column and a connecting rod piece, wherein a limiting step protruding outwards is arranged on the outer wall of the limiting compression ring along the circumferential direction, the inner diameter of the limiting compression ring is matched with the outer diameter of the connecting rod piece, the connecting rod piece is fixedly connected with an embedded part in the track supporting structure, a through hole is formed in the position, corresponding to the connecting rod piece, of the vibration damping leveling layer, the connecting rod piece extends out of the top surface of the vibration damping leveling layer through the through hole, the limiting compression ring is sleeved on the connecting rod piece, and concrete is poured in a gap between the limiting compression ring and the connecting rod piece to form the damping connecting column;
the centers of the connecting ends of two adjacent track plates are respectively provided with accommodating grooves which have the same structure and are oppositely arranged, after the adjacent track plates are spliced, the space formed by enclosing the two opposite accommodating grooves is matched with the size of the limiting pressure ring, the inner wall of each accommodating groove is provided with a positioning block, each positioning block corresponds to a limiting step on the limiting pressure ring, and is matched with the limiting step through the positioning block; and after the track plates are spliced, pouring an elastic material in a gap between the limiting compression ring and the accommodating groove to form an elastic connection ring.
In the embodiment, the concrete for pouring the damping connecting column is self-leveling high-damping concrete.
In the present embodiment, the elastic material is polyurethane, epoxy-modified polyurethane, or urethane-modified epoxy.
In this embodiment, the built-in limiting boss is cylindrical, elliptic cylindrical, polygonal column-shaped or kidney column-shaped.
In this embodiment, spacing clamping ring is fixed by two upper and lower coaxial rings of laying and forms, the height and the track plate thickness phase-match of spacing clamping ring, the last ring external diameter of spacing clamping ring is greater than ring external diameter down, makes the outside of spacing clamping ring, last ring and ring junction form a spacing step down.
In this embodiment, the limiting connection rod piece further comprises an external limiting fastener, and the external limiting fastener comprises a limiting side stop pillar; the external limiting fasteners are arranged on two sides of the track plate, the bottom of the limiting side retaining column is fixed on the supporting structure through the anchoring studs, the middle of the limiting side retaining column is pressed on the side face of the track plate, and the top of the limiting side retaining column is buckled on the top face of the track plate. In the embodiment, the limiting side retaining column is made of the prefabricated steel material, materials are convenient to obtain, the design is standardized, the production is industrialized, the assembling method and the assembling efficiency are simple and efficient, and the limiting side retaining column is easy to replace. The structural shape of external limiting fastener can be according to orbital concrete installation environment and the specific setting of the condition, atress situation of accepting of load, and external limiting fastener is L type or Z type in this embodiment.
Above-mentioned structure, it is spacing to ballastless track unit module level and vertical direction to take built-in spacing boss and external spacing fastener, particularly, adopt built-in spacing boss in two adjacent unit composite sheets, adopt external spacing fastener outward, both combine together to guarantee that adjacent ballastless track unit module connects fixedly stably, when dismantling the maintenance, only need remove external spacing fastener, destroy the damping spliced pole simultaneously, take out spacing clamping ring and can change ballastless track unit module.
The invention also comprises a construction method of the assembled ballastless track of the high-speed railway, which is used for constructing the assembled ballastless track structure and specifically comprises the following steps:
a. firstly, according to the design of a track, prefabricating ballastless track unit modules in a factory, embedding an embedded part in a supporting structure of the track, and vertically fixing a connecting rod piece on the embedded part;
b. then laying a vibration damping leveling layer, wherein the vibration damping leveling layer adopts a cement blanket, the cement blanket is laid on the supporting structure along the track design direction, the upper end of the connecting rod piece extends out of the through hole of the vibration damping leveling layer, and then watering is carried out on the surface of the cement blanket to soften the cement blanket;
c. connecting the ballastless track unit modules end to end on a cement blanket, enabling a connecting rod piece to be arranged in a containing groove formed by connecting adjacent ballastless track unit modules, and applying a prepressing example to the ballastless track unit modules according to design requirements before the cement blanket is hardened to realize leveling of the ballastless track unit modules;
d. after the cement blanket is hardened, sleeving the limiting compression ring on the connecting rod piece of the accommodating cavity, pouring self-leveling high-damping concrete into a gap between the limiting compression ring and the connecting rod piece to form a damping connecting column, and pouring and filling one of polyurethane, epoxy modified polyurethane and polyurethane modified epoxy materials into the gap between the limiting compression ring and the inner wall of the accommodating cavity to form an elastic connecting ring;
e. external limiting fasteners are arranged on two sides of the ballastless track unit module,
the bottom of the limiting side blocking column is fixed on the supporting structure through an anchoring stud, the middle of the limiting side blocking column is pressed against the side face of the track plate, and the top of the limiting side blocking column is buckled on the top face of the track plate.
By adopting the method, the ballastless track is modularized, and the construction site only needs to be assembled; the cement blanket is used as a vibration reduction leveling layer of the assembled ballastless track structure, when in use, the cement blanket is directly laid on a supporting structure, then the surface of the supporting structure is watered, cement powder in the cement blanket and water are subjected to hydration reaction to form semisolid, a ballastless track unit module is laid on the cement blanket before the cement blanket is hardened, and certain pre-pressure is applied, so that the ballastless track unit module can be accurately leveled conveniently; adopt built-in spacing boss and external spacing fastener to ballastless track unit module level and vertical direction spacing, particularly, adopt built-in spacing boss in two adjacent unit composite sheets, adopt external spacing fastener outward, both combine together to guarantee that adjacent ballastless track unit module connects fixedly stably, when dismantling the maintenance, only need remove external spacing fastener, destroy the damping spliced pole simultaneously, take out spacing clamping ring and can change ballastless track unit module.
By adopting the method, the invention has the following advantages;
1. the assembled ballastless track structure, the vibration-damping leveling layer and the limiting connecting rod piece are all in standardized design, standardized factory production and standardized on-site mechanical installation, so that the defect of on-site mass concrete wet operation is avoided, and the precision of the track structure is integrally and greatly improved;
2. by adopting the processes of factory prefabrication, field assembly, construction by a 'forward method' and the like, the problems of more defects, difficult quality control and the like of cast-in-place concrete are solved, the problems of interlayer interface crack separation, damage and the like caused by construction by a 'reverse method' are avoided, and the defects of a track structure are greatly reduced integrally;
3. the cement blanket is used as a vibration damping leveling layer, has the advantages of high strength, good tensile property, good seepage-proofing property, good durability, convenient construction, environmental friendliness, economy and the like, and can realize deformation coordination with a ballastless track unit module, thereby achieving the vibration damping effect of a track structure;
4. the technology of standardized production, standardized assembly, sequential construction method construction and the like is adopted, so that the damage of the track structure is greatly reduced, the service life of the track is prolonged, and the maintenance cost is reduced;
5. the factory prefabrication and the field assembly are adopted, so that a large amount of concrete wet operation on the field is avoided, the concrete waste is reduced, and the pollution of the concrete field construction to the environment is reduced;
6. the prefabricated part adopts the construction of on-the-spot mode of assembling, and track structure is whole and the part is lighter, and easy the component of easily damaging is easily removed and is changed.
In conclusion, the prefabricated module is miniaturized, standardized in design, industrialized in production, simple and mechanized in installation and leveling, and has the characteristics of high precision, few diseases, good vibration attenuation, long service life, energy conservation, environmental friendliness, easiness in maintenance and the like.
Drawings
FIG. 1 is a schematic three-dimensional structure of the present invention;
FIG. 2 is an exploded view of FIG. 1;
FIG. 3 is an exploded schematic view of the ballastless track unit module and the vibration-damping leveling layer of FIG. 1;
FIG. 4 is a partially exploded view of the internal limiting boss and external limiting fastener of the present invention;
FIG. 5 is a schematic diagram of a three-dimensional structure of the present invention built on a roadbed;
FIG. 6 is a schematic diagram of a three-dimensional structure constructed on a bridge according to the present invention;
in the attached drawings, 1, a steel rail; 2. a fastener system; 3. a ballastless track unit module; 301. a rail bearing platform; 302. a track plate; 5. a vibration damping leveling layer; 6. door-shaped steel bars; 7. a limit boss is arranged in the groove; 701. an elastic connecting ring; 702. limiting a compression ring; 703. a damping connecting column; 704. connecting rod pieces; 8. an external limit fastener; 801. limiting side retaining columns; 802. anchoring the stud; 9. a roadbed; 10. a box girder; 11. a support; 12. and (6) bridge pier.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides an assembled ballastless track structure of a high-speed railway, which includes ballastless track unit modules 3, a vibration damping leveling layer 5, and a limiting connection rod;
the limiting connecting rod piece is fixed on a track supporting structure along the designed extending direction of a track, the vibration damping leveling layer 5 is laid on the track supporting structure, the ballastless track unit module 3 is a prefabricated structure, two rows of door-shaped steel bars 6 are arranged below the bottom of the ballastless track unit module 3, the ballastless track unit module 3 is laid on the vibration damping leveling layer 5 in an end-to-end connection mode, the door-shaped steel bars connect the ballastless track unit module 3 and the vibration damping leveling layer 5 into an integral structure, the ballastless track unit module 3 is fixed on the supporting structure through the limiting connecting rod piece, and the vibration damping leveling layer 5 is further fixed;
the support structure in this embodiment may be a roadbed 9 (when the track is laid on the ground) or a box girder 10 of a bridge (when the track is laid on a bridge deck).
The vibration-damping leveling layer 5 adopts a cement blanket, and the cement blanket in the embodiment is a three-dimensional space fabric reinforced cement-based composite material; the cement blanket is soft in material, after being laid, the cement blanket is subjected to hydration reaction through watering, and the cement blanket is hardened into a firm building component within a plurality of hours. The vibration damping leveling layer 5 is used for supporting the ballastless track unit module 3 and is used for applying pre-pressure to the upper ballastless track unit module 3 in the process from hydration to hardening so as to realize fine leveling of the ballastless track.
The ballastless track unit module 3 comprises a track plate 302 and a rail bearing platform 301 fixed on the track plate 302, after the ballastless track unit module 3 is laid, the steel rail 1 is supported on the rail bearing platform 301, and the steel rail 1 is locked and fixed on the rail bearing platform 301 through a fastener system 2. In the embodiment, the ballastless track unit module 3 is prefabricated and molded by a factory, and is simple to process and high in manufacturing precision. The fastener system 2 includes two sets of fasteners, which are respectively disposed on two sides of the steel rail 1, and since the fasteners belong to the prior art, they will not be described herein.
The limiting connecting rod piece comprises an internal limiting boss 7 and an external limiting fastener 8;
the built-in limiting boss 7 comprises an elastic connecting ring 701, a limiting pressing ring 702, a damping connecting column 703 and a connecting rod piece 704, wherein the limiting pressing ring 702 is formed by fixing an upper ring and a lower ring which are coaxially arranged, the height of the limiting pressing ring 702 is matched with the thickness of the track plate 302, the outer diameter of the upper ring of the limiting pressing ring 702 is larger than the outer diameter of the lower ring, so that a limiting step is formed at the joint of the upper ring and the lower ring outside the limiting pressing ring 702, the inner diameter of the limiting pressing ring 702 is matched with the outer diameter of the connecting rod piece 704, the connecting rod piece 704 is fixedly connected with an embedded part in a track supporting structure, a through hole is formed in the position, corresponding to the connecting rod piece 704, on the vibration damping leveling layer 5, the connecting rod piece 704 extends out of the top surface of the vibration leveling layer 5 through the through hole, the limiting pressing ring 702 is sleeved on the connecting rod piece 704, and self-leveling high-damping concrete is poured in a gap between the limiting pressing ring 702 and the connecting rod piece 704 to form the damping connecting column 703;
the centers of the connecting ends of two adjacent track plates 302 are respectively provided with accommodating grooves which have the same structure and are oppositely arranged, after the two adjacent track plates 302 are spliced, the space formed by enclosing the two opposite accommodating grooves is matched with the size of the limiting pressure ring 702, the inner wall of each accommodating groove is provided with a positioning block, the positioning block corresponds to the limiting step on the limiting pressure ring 702, and is matched with the limiting step through the positioning block, when the two adjacent track plates 302 are spliced, the positioning block is clamped below the limiting step to limit the track plates 302 in the vertical direction, so that the two adjacent track plates 302 are ensured to be positioned on the same horizontal plane;
after the adjacent track plates 302 are spliced, polyurethane, epoxy modified polyurethane or polyurethane modified epoxy is poured into a gap between the limiting compression ring 702 and the accommodating groove to form an elastic connection ring 701;
in this embodiment, the connection rod 704 is an i-steel made of rigid material, which is easy to obtain, easy to manufacture, and reliable in connection strength; the limiting compression ring 702 is prefabricated and molded by Ultra High Performance Concrete (UHPC) in a factory, the compressive strength of the limiting compression ring is more than 150MPa, and the limiting compression ring has good crack resistance and durability;
during actual construction, firstly fixing the lower end of a connecting rod piece 704 with an embedded part in a supporting structure, then laying a vibration damping leveling layer 5, extending the upper end of the connecting rod piece 704 out of a through hole of the vibration damping leveling layer 5, then laying a ballastless track unit module 3, and placing the connecting rod piece 704 in a containing groove of the ballastless track unit module 3; then the limiting pressure ring 702 is sleeved in the accommodating cavity, so that the track plate 302 is positioned in the vertical direction, self-leveling high-damping concrete is poured in a gap between the limiting pressure ring 702 and the connecting rod piece 704 to form a damping connecting column 703, the limiting pressure ring 702 and the connecting rod piece 704 are fixed by the damping connecting column 703, and meanwhile, the damping effect is exerted on the upper structure of the built-in limiting boss 7, the self-leveling performance ensures the construction performance and quality of concrete, and the high-damping performance ensures the damping effect of the concrete; and then, one of polyurethane, epoxy modified polyurethane and polyurethane modified epoxy materials is adopted to pour and fill the gap between the limiting compression ring 702 and the inner wall of the accommodating cavity to form an elastic connection ring 701, so that the ballastless track unit module 3 can be subjected to adaptive fine adjustment of a paving position according to the temperature and load conditions.
Optionally, the structural shape of the built-in limiting boss 7 can be specifically set according to the specific installation environment, the load bearing condition, the stress condition and the like of the track. The built-in limit boss 7 can be one of a cylinder type, an elliptic cylinder type, a polygonal column type or a kidney-shaped column type. The shape of the containing cavity is matched with the shape of the built-in limiting boss 7,
the external limiting fastener 8 comprises a limiting side retaining column 801; the external limiting fasteners 8 are arranged on two sides of the track plate 302, the bottom of the limiting side retaining column 801 is fixed on a supporting structure through the anchoring studs 802, the middle of the limiting side retaining column 801 is pressed on the side face of the track plate 302 in a supporting mode, the top of the limiting side retaining column 801 is buckled on the top face of the track plate 302, in the embodiment, the limiting side retaining column 801 is made of prefabricated steel materials, materials are convenient to obtain, design is standardized, production is industrialized, the assembling method and the assembling efficiency are simple and efficient, and the replacement is easy. The structural shape of the external limiting fastener 8 can be specifically set according to the specific installation environment and load bearing condition of the track and the stress condition, and the external limiting fastener 8 is L-shaped or Z-shaped in the embodiment.
The invention also comprises a construction method of the assembled ballastless track of the high-speed railway, which is used for constructing the assembled ballastless track structure and specifically comprises the following steps:
a. firstly, prefabricating ballastless track unit modules in a factory according to track design, embedding embedded parts in a supporting structure of a track, and vertically fixing a connecting rod piece on the embedded parts;
b. then laying a vibration damping leveling layer, wherein the vibration damping leveling layer adopts a cement blanket, the cement blanket is laid on the supporting structure along the track design direction, meanwhile, the upper end of the connecting rod piece extends out of the through hole of the vibration damping leveling layer, and then watering is carried out on the surface of the cement blanket to soften the cement blanket;
c. connecting the ballastless track unit modules end to end on a cement blanket, enabling a connecting rod piece to be arranged in a containing groove formed by connecting adjacent ballastless track unit modules, and applying a prepressing example to the ballastless track unit modules according to design requirements before the cement blanket is hardened to realize leveling of the ballastless track unit modules;
in the actual fine leveling construction, the elevation and the settlement of a base layer are measured and controlled by adopting machine vision, in order to reduce errors of elevation and thickness control and calculation workload, an electronic computer is adopted to measure a plurality of measuring points which are sequentially arranged on each section at intervals, the set elevation of the ballastless track unit module obtained by observation and the measured elevation of each measuring point are made into a data file, the difference value between the elevation of each measuring point and the design elevation, the thickness of each measuring point, the thickness average value, the mean value and the representative value of each paragraph are obtained by data analysis, and the next adjustment and control are guided.
d. After the cement blanket is hardened, sleeving the limiting compression ring on the connecting rod piece of the accommodating cavity, pouring self-leveling high-damping concrete into a gap between the limiting compression ring and the connecting rod piece to form a damping connecting column, and pouring and filling one of polyurethane, epoxy modified polyurethane and polyurethane modified epoxy materials into the gap between the limiting compression ring and the inner wall of the accommodating cavity to form an elastic connecting ring;
e. external limiting fasteners are arranged on two sides of the ballastless track unit module,
the bottom of the limiting side retaining column is fixed on the supporting structure through an anchoring stud, the middle of the limiting side retaining column is pressed against the side face of the track plate, and the top of the limiting side retaining column is buckled on the top face of the track plate.
In the step a, the prefabricating process of the ballastless track unit module comprises the following steps: the method comprises the steps of prefabricating a standard track plate (with door-shaped steel bars), galling the bottom of the track plate, spreading fiber materials for enhancing the interface bonding performance, and finally pouring a reinforced concrete layer on the upper side of the bottom of the track plate according to design.
By the method, when the ballastless track unit module is disassembled and maintained, the ballastless track unit module can be replaced only by removing the external limiting fastener, destroying the damping connecting column and taking out the limiting compression ring.
Example 1:
as shown in fig. 5, the vibration damping leveling layer 5 is directly laid on the roadbed 9 of the railway, and the ballastless track unit modules are further laid on the vibration damping leveling layer 5.
Example 2:
as shown in fig. 6, the difference from embodiment 1 is that the vibration damping leveling layer 5 is directly laid on the box girder 10 of the abutment 11 on the pier 12.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The assembled ballastless track structure of the high-speed railway is characterized by comprising ballastless track unit modules (3), a vibration damping leveling layer (5) and a limiting connecting rod piece (704); the ballastless track unit module is characterized in that the limiting connecting rod piece (704) is fixed on a track supporting structure along the design extending direction of a track, the vibration damping leveling layer (5) is laid on the track supporting structure, the ballastless track unit module (3) is of a prefabricated structure, the ballastless track unit module (3) is laid on the vibration damping leveling layer (5) in a head-to-tail connection mode, and the ballastless track unit module (3) is fixed on the supporting structure through the limiting connecting rod piece (704).
2. The assembled ballastless track structure of the high-speed railway of claim 1, wherein: the vibration-damping leveling layer (5) is made of a cement blanket.
3. The assembled ballastless track structure of the high-speed railway of claim 1, wherein: the ballastless track unit module (3) comprises a track plate (302) and a track bearing platform (301) fixed on the track plate (302).
4. The assembled ballastless track structure of the high-speed railway of claim 3, wherein: the limiting connecting rod piece (704) comprises a built-in limiting boss (7);
the built-in limiting boss (7) comprises an elastic connecting ring (701), a limiting pressing ring (702), a damping connecting column (703) and a connecting rod piece (704), wherein the outer wall of the limiting pressing ring (702) is provided with limiting steps protruding outwards along the circumferential direction, the inner diameter of the limiting pressing ring (702) is matched with the outer diameter of the connecting rod piece (704), the connecting rod piece (704) is fixedly connected with an embedded part in the track supporting structure, a through hole is formed in the position, corresponding to the connecting rod piece (704), on the vibration damping leveling layer (5), the connecting rod piece (704) extends out of the top surface of the vibration damping leveling layer (5) through the through hole, the limiting pressing ring (702) is sleeved on the connecting rod piece (704), and concrete is poured in a gap between the limiting pressing ring (702) and the connecting rod piece (704) to form the damping connecting column (703);
the centers of the connecting ends of two adjacent track plates (302) are respectively provided with containing grooves which are identical in structure and are oppositely arranged, after the adjacent track plates (302) are spliced, the space formed by enclosing the two opposite containing grooves is matched with the size of the limiting pressure ring (702), the inner wall of each containing groove is provided with a positioning block, each positioning block corresponds to the limiting step on the limiting pressure ring (702), the positioning blocks are matched with the limiting steps, and when the two adjacent track plates (302) are spliced, the positioning blocks are clamped below the limiting steps to limit the track plates (302) in the vertical direction; and after the adjacent track plates (302) are spliced, pouring an elastic material in a gap between the limiting compression ring (702) and the accommodating groove to form an elastic connecting ring (701).
5. The ballastless track structure of high-speed railway assembled type, according to claim 4, wherein: the concrete for pouring the damping connecting column (703) adopts self-leveling high-damping concrete.
6. The assembled ballastless track structure of the high-speed railway of claim 4, wherein: the elastic material is polyurethane, epoxy modified polyurethane or polyurethane modified epoxy.
7. The assembled ballastless track structure of the high-speed railway of claim 4, wherein: the built-in limiting boss (7) is cylindrical, elliptic cylindrical, polygonal column or kidney column.
8. The assembled ballastless track structure of the high-speed railway of claim 4, wherein: spacing clamping ring (702) are formed by the ring of upper and lower two coaxial laying fixed, the height of spacing clamping ring (702) and the thickness phase-match of track board (302), the last ring external diameter of spacing clamping ring (702) is greater than ring external diameter down, makes the outside of spacing clamping ring (702), last ring and lower ring junction form a spacing step.
9. The assembled ballastless track structure of the high-speed railway of claim 4, wherein: the limiting connecting rod piece (704) further comprises an external limiting fastener (8), and the external limiting fastener (8) comprises a limiting side retaining column (801); the external limiting fastener (8) is arranged on two sides of the track plate (302), the bottom of the limiting side retaining column (801) is fixed on a supporting structure through an anchoring stud (802), the middle of the limiting side retaining column (801) is pressed against the side face of the track plate (302), and the top of the limiting side retaining column (801) is buckled on the top face of the track plate (302).
10. A construction method of a fabricated ballastless track of a high-speed railway is used for constructing the fabricated ballastless track structure of claim 9, and is characterized by comprising the following steps:
a. firstly, prefabricating a ballastless track unit module (3) in a factory according to track design, embedding an embedded part in a supporting structure of a track, and vertically fixing a connecting rod piece (704) on the embedded part;
b. then paving a vibration damping leveling layer (5), wherein the vibration damping leveling layer (5) adopts a cement blanket, the cement blanket is paved on the supporting structure along the track design direction, meanwhile, the upper end of a connecting rod piece (704) extends out of a through hole of the vibration damping leveling layer (5), and then, watering is carried out on the surface of the cement blanket to soften the cement blanket;
c. connecting the ballastless track unit modules (3) end to end and paving the cement blankets, so that the connecting rod piece (704) is arranged in a containing groove formed by connecting the adjacent ballastless track unit modules (3), and applying a prepressing example to the ballastless track unit modules (3) according to design requirements before the cement blankets are hardened to realize the leveling of the ballastless track unit modules (3);
d. after the cement blanket is hardened, sleeving the limiting pressure ring (702) on a connecting rod piece (704) of the accommodating cavity, pouring self-leveling high-damping concrete into a gap between the limiting pressure ring (702) and the connecting rod piece (704) to form a damping connecting column (703), and pouring one of polyurethane, epoxy modified polyurethane and polyurethane modified epoxy materials to fill the gap between the limiting pressure ring (702) and the inner wall of the accommodating cavity to form an elastic connecting ring (701);
e. external limiting fasteners (8) are arranged on two sides of the ballastless track unit module (3),
the bottom of a limiting side blocking column (801) is fixed on a supporting structure through an anchoring stud (802), the middle of the limiting side blocking column (801) is pressed against the side face of the track plate (302), and the top of the limiting side blocking column (801) is buckled on the top face of the track plate (302).
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