CN114960302A - Assembled ballastless track structure of high-speed railway and construction method - Google Patents

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

A high-speed railway assembled ballastless track structure and construction method

technical field

The invention relates to the technical field of rail transportation, in particular to a high-speed railway assembled ballastless track structure and a construction method.

Background technique

As the material carrier of the train operation, the service safety of the track structure will directly affect the operation safety of the train, and its force during the service process is very complex, and it plays an important role in the safe operation of the railway.

Ballastless track structure has become the main track structure type of high-speed railway due to its advantages of high smoothness, high stability and less maintenance. At present, the ballastless track types that have been applied in our country mainly include double block type, CRTS I type slab type, CRTS II type slab type and CRTS III type slab type. This vertical multi-layered, longitudinally heterogeneous ribbon structure system has the characteristics of large differences in construction material properties, multiple structural layers, complex service environment and construction technology. Under the long-term and repeated action of multi-environment and multi-action coupling, different disease phenomena such as component damage, interface separation and slurry, and track slab arching appear. , affecting the safe service of the track structure, driving comfort and maintenance difficulties. The practice of high-speed railway shows that the disease problem of ballastless track is closely related to the form of the track structure, the "reverse method" construction technology, and a large number of wet operations on site. Therefore, it is urgent to explore the basic mechanism and laws of the ballastless track structure in the whole life cycle, and to invent a new type of ballastless track structure with high precision, less disease, long life, energy saving and environmental protection, and easy maintenance.

SUMMARY OF THE INVENTION

The invention solves the deficiencies of the prior art and provides a high-speed railway assembled ballastless track structure and a construction method with fast construction, simple and convenient construction, convenient maintenance, high quality and long service life.

In order to achieve the above purpose, the present invention first proposes an assembled ballastless track structure for a high-speed railway, which includes a ballastless track unit module, a vibration reduction and leveling layer, and a limit connecting rod; the limit connecting rod is designed along the track. The extension direction is fixed on the track support structure, the vibration reduction and leveling layer is laid on the track support structure, the ballastless track unit module is a prefabricated structure, and the ballastless track unit module is connected end to end and laid on the vibration reduction level layer, and the ballastless track unit module is fixed on the support structure through the limit connecting rod.

With the above structure, the smoothness of the top surface when the ballastless track unit module is laid is controlled by laying a vibration damping leveling layer on the track support structure, so as to realize the secondary leveling of the track on the ballastless track unit module; the ballastless track unit module is in the During prefabrication in the factory, the primary leveling of the track is realized, and the secondary fine leveling is realized on site through the pre-compressed vibration-damping leveling layer. The construction efficiency is higher, and the problem of interlayer interface disease caused by the "reverse method" construction is avoided.

In addition, the assembly of the ballastless track structure is realized by assembling and combining the prefabricated ballastless track unit modules. On the one hand, the applicability is strong, the ballastless track unit module is convenient for transportation, and the assembly method is simple and efficient. Repair and replacement, when repairing and replacing, only need to replace or repair the damaged ballastless track unit module, which can achieve rapid repair, simple replacement, low maintenance cost, short maintenance period, low labor intensity of workers, more suitable for Requirements for the maintenance of high-speed railways during the "skylight period".

In this embodiment, the vibration damping and leveling layer adopts a cement blanket. The cement blanket in this embodiment is a three-dimensional spacer fabric reinforced cement-based composite material; the cement blanket is soft, can be laid in any shape, does not require stirring and mold forming, and is filled with dry powder and hardened by watering. The vibration damping and leveling layer is used to support the ballastless track unit module, and is used to achieve fine leveling of the ballastless track by applying pre-pressure to the upper ballastless track unit module during the process from hydration to hardening.

In this embodiment, the ballastless track unit module includes a track plate and a rail support platform fixed on the track plate. In this embodiment, the ballastless track unit module is prefabricated in a factory, which is simple to process and has high manufacturing precision.

In this embodiment, the limit connecting rod includes a built-in limit boss;

The built-in limit boss includes an elastic connecting ring, a limit pressure ring, a damping connecting column and a connecting rod. The outer wall of the limit pressure ring is provided with a limit step protruding outward along the circumferential direction. The inner diameter of the pressure ring matches the outer diameter of the connecting rod, the connecting rod is connected and fixed with the embedded part of the track support structure, and the vibration reduction and leveling layer is provided with a pass through at the position corresponding to the connecting rod. The connecting rod protrudes from the top surface of the vibration damping and leveling layer through the through hole, the limit pressure ring is sleeved on the connecting rod, and the space between the limit pressure ring and the connecting rod is cast in the gap Concrete forms damping connecting columns;

The centers of the connecting ends of the two adjacent track plates are respectively provided with accommodating grooves with the same structure and oppositely arranged. After the adjacent track plates are spliced, the space enclosed by the two opposite accommodating grooves and the limit pressure ring are formed. The inner wall of the accommodating groove is provided with a positioning block, the positioning block corresponds to the upper limit step of the limit pressure ring, and the positioning block cooperates with the limit step, when two adjacent track plates are assembled , the positioning block is clamped under the limit step to limit the vertical direction of the track plate; after the adjacent track plates are spliced, the elastic material is poured in the gap between the limit pressure ring and the accommodating groove to form an elastic connecting ring .

In this embodiment, self-leveling high damping concrete is used as the concrete for pouring the damping connecting column.

In this embodiment, the elastic material adopts polyurethane, epoxy, epoxy-modified polyurethane or polyurethane-modified epoxy.

In this embodiment, the built-in limiting bosses are cylindrical, elliptical, polygonal, or girdle-shaped.

In this embodiment, the limit pressure ring is fixed by two coaxially arranged upper and lower rings. The height of the limit pressure ring matches the thickness of the track plate. The outer diameter of the upper ring is larger than the outer diameter of the lower ring, so that a limit step is formed on the outer side of the limit pressure ring at the connection between the upper ring and the lower ring.

In this embodiment, the limit connecting rod further includes an external limit fastener, and the external limit fastener includes a limit side stop column; the external limit fastener is arranged on two sides of the track plate. The bottom of the limit side block post is fixed on the support structure by the anchor bolts, the middle part of the limit side block post is pressed against the side surface of the track plate, and the top of the limit side block post is buckled on the top surface of the track plate. In this embodiment, the limiting side stopper is prepared and formed from prefabricated steel material, which is convenient to obtain materials, standardized in design, industrialized in production, simple and efficient in assembly method and efficiency, and easy to replace. The structural shape of the external limit fastener can be specifically set according to the specific installation environment of the track, load bearing conditions, and stress conditions. In this embodiment, the external limit fastener is L-shaped or Z-shaped.

The above structure adopts built-in limit bosses and external limit fasteners to limit the horizontal and vertical directions of the ballastless track unit module. External limit fasteners, the combination of the two ensures the stable connection of adjacent ballastless track unit modules. When dismantling and repairing, just remove the external limit fasteners, destroy the damping connecting column, and take out the limit pressure The ballastless track unit module can be replaced by the ring.

The present invention also includes a construction method for the assembled ballastless track of a high-speed railway, which is used for constructing the above-mentioned assembled ballastless track structure, and specifically includes the following steps:

a. First, according to the track design, the ballastless track unit module is prefabricated in the factory, the embedded parts are embedded in the support structure of the track, and the connecting rods are vertically fixed on the embedded parts;

b. Then lay a vibration-damping and leveling layer. The vibration-damping and leveling layer is made of cement blanket. Lay the cement blanket on the support structure along the track design direction, and at the same time make the upper end of the connecting rod extend from the through hole of the vibration-damping and leveling layer. Extend, then water the surface of the cement blanket to soften the cement blanket;

c. Lay the ballastless track unit modules end-to-end on the cement blanket, so that the connecting rods are placed in the accommodating groove formed by the connection of the adjacent ballastless track unit modules. Before the cement blanket hardens, according to the design requirements, the ballastless track Example of applying preload to the unit module to realize the leveling of the unit module of the ballastless track;

d. After the cement blanket is hardened, set the limit pressure ring on the connecting rod of the accommodating cavity, and use self-leveling high damping concrete to pour it into the gap between the limit pressure ring and the connecting rod to form a damping connecting column , and then use one of polyurethane, epoxy, epoxy-modified polyurethane, and polyurethane-modified epoxy materials to fill the gap between the limit pressure ring and the inner wall of the accommodating cavity to form an elastic connecting ring;

e. Arrange external limit fasteners on both sides of the ballastless track unit module,

The bottom of the limit side stop is fixed on the support structure by the anchor bolt, the middle of the limit side stop is pressed against the side of the track plate, and the top of the limit side stop is buckled on the track plate. on the top surface.

Using the above method, the ballastless track is modularized, and the construction site only needs to be assembled; the cement blanket is used as the vibration reduction and leveling layer of the assembled ballastless track structure. The surface is watered, and the cement powder in the cement blanket reacts with water to form a semi-solid. Before the cement blanket hardens, a ballastless track unit module is laid on the cement blanket, and a certain pre-pressure is applied, so as to facilitate the installation of the ballastless track unit. Precise leveling of modules; use built-in limit bosses and external limit fasteners to limit the ballastless track unit module horizontally and vertically. Specifically, built-in limit bosses are used in the composite panels of two adjacent units. , External limit fasteners are used outside, and the two are combined to ensure that the connection and fixation of adjacent ballastless track unit modules are stable. When dismantling and repairing, only remove the external limit fasteners, and at the same time destroy the damping connection column, take out The ballastless track unit module can be replaced by the limit pressure ring.

Due to the above method, the present invention has the following advantages;

1. The prefabricated ballastless track structure, vibration reduction and leveling layer and limit connecting rods all adopt standardized design, standardized factory production, and standardized on-site mechanical installation, which avoids the shortage of a large number of concrete wet operations on site, and greatly improves the overall track structure. accuracy;

2. The use of factory prefabrication, on-site assembly, and "sequential method" construction has improved the problems of many diseases and difficult quality control of cast-in-place concrete, and avoided the interlayer interface separation and damage caused by the "reverse method" construction. problems, the overall damage to the track structure is greatly reduced;

3. The cement blanket is used as the vibration reduction and leveling layer. The cement blanket has many advantages such as high strength, good tensile performance, good anti-seepage performance, good durability, convenient construction, environmental friendliness, economy, etc., and can be combined with ballastless track units. The module realizes deformation coordination, so as to achieve the vibration reduction effect of the track structure;

4. The use of standardized production, standardized assembly, and smooth construction methods greatly reduces the damage of the track structure, prolongs the life of the track, and reduces the maintenance and repair costs;

5. Adopt factory prefabrication and on-site assembly, which avoids a lot of concrete wet work on site, reduces concrete waste, and reduces environmental pollution caused by concrete on-site construction;

6. The prefabricated components are constructed by on-site assembly mode, the overall track structure and components are lighter, and the vulnerable components are easy to remove and replace.

To sum up, the prefabricated modules of the present invention are miniaturized, standardized in design, industrialized in production, simple and mechanized in installation and leveling, and have the characteristics of high precision, less disease, good vibration damping, long life, energy saving and environmental protection, and easy maintenance.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the exploded schematic diagram of Fig. 1;

Fig. 3 is the exploded schematic diagram of the ballastless track unit module and the vibration reduction leveling layer of Fig. 1;

Fig. 4 is the partial exploded schematic diagram of the built-in limit boss and the external limit fastener of the present invention;

Fig. 5 is the three-dimensional structure schematic diagram that the present invention is built on the roadbed;

Fig. 6 is the three-dimensional structure schematic diagram that the present invention is built on the bridge;

In the drawings, 1. steel rail; 2. fastener system; 3. ballastless track unit module; 301, rail bearing platform; 302, track plate; Limit boss; 701, elastic connecting ring; 702, limit pressure ring; 703, damping connecting column; 704, connecting rod; 8, external limit fastener; 801, limit side stop column; 802, anchor 9. Subgrade; 10. Box girder; 11. Support; 12. Bridge pier.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

As shown in Figure 1, this example provides a high-speed railway assembled ballastless track structure, including a ballastless track unit module 3, a vibration reduction and leveling layer 5 and a limit connecting rod;

The limit connecting rod is fixed on the track support structure along the extending direction of the track design, the vibration damping and leveling layer 5 is laid on the track support structure, the ballastless track unit module 3 is a prefabricated structure, and the There are two rows of door-shaped steel bars 6 under the bottom of the ballast track unit module 3. The ballastless track unit modules 3 are connected end to end and laid on the vibration reduction and leveling layer 5. The gate-shaped steel bars connect the ballastless track unit module 3 with the vibration reduction adjustment The leveling layer 5 is connected into an integral structure, and the ballastless track unit module 3 is fixed on the support structure through the limit connecting rod, and the vibration reduction and leveling layer 5 is further fixed;

The supporting structure in this embodiment may be the roadbed 9 (when the track is laid on the ground), or may be the box girder 10 of the bridge (when the track is laid on the bridge deck).

The vibration damping and leveling layer 5 is a cement blanket, and the cement blanket in this embodiment is a three-dimensional spacer fabric reinforced cement-based composite material; The cement blanket hardens into a solid building component within hours. It has many advantages such as high strength, good deformation performance, good anti-seepage performance, good durability, convenient construction, environmental friendliness, economy, etc. There is a disease of the track base plate, which improves the construction speed and the vibration damping performance of the track structure. The vibration damping and leveling layer 5 is used to support the ballastless track unit module 3 , and is used to apply pre-pressure to the upper ballastless track unit module 3 during the process from hydration to hardening, so as to achieve precise leveling of the ballastless track.

The ballastless track unit module 3 includes 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 rail 1 is supported on the rail bearing platform 301. And the rail 1 is locked and fixed on the rail support platform 301 through the fastener system 2 . In this embodiment, the ballastless track unit module 3 is prefabricated in a factory, which is simple to process and has high manufacturing precision. The fastener system 2 includes two groups of fasteners, and the two groups of fasteners are arranged on both sides of the steel rail 1 respectively. Since the fasteners belong to the prior art, they will not be described here.

The limit connecting rod includes a built-in limit boss 7 and an external limit fastener 8;

The built-in limit boss 7 includes an elastic connecting ring 701, a limit pressure ring 702, a damping connecting column 703 and a connecting rod 704. The limit pressure ring 702 is fixed by two coaxially arranged upper and lower rings. , the height of the limit pressure ring 702 matches the thickness of the track plate 302, and the outer diameter of the upper ring of the limit pressure ring 702 is larger than the outer diameter of the lower ring, so that the outer side of the limit pressure ring 702, A limit step is formed at the connection between the upper ring and the lower ring, the inner diameter of the limit pressure ring 702 matches the outer diameter of the connecting rod 704, and the connecting rod 704 is embedded in the track support structure The vibration-damping and leveling layer 5 is provided with a through hole at a position corresponding to the connecting rod 704, and the connecting rod 704 protrudes from the top surface of the vibration-damping and leveling layer 5 through the through hole. The limit pressure ring 702 is sleeved on the connecting rod 704, and the self-leveling high damping concrete is poured in the gap between the limit pressure ring 702 and the connecting rod 704 to form the damping connecting column 703;

The centers of the connecting ends of the two adjacent rail plates 302 are respectively provided with accommodating grooves with the same structure and oppositely arranged. The size of the pressure ring 702 is matched, and a positioning block is arranged on the inner wall of the accommodating groove. The positioning block corresponds to the upper limit step of the limit pressure ring 702. When the rail plate 302 is assembled, the positioning block is clamped under the limit step to limit the vertical direction of the rail plate 302, thereby ensuring that the two adjacent rail plates 302 are in the same horizontal plane;

After the adjacent rail plates 302 are spliced together, the elastic connecting ring 701 is formed by pouring polyurethane, epoxy, epoxy modified polyurethane or polyurethane modified epoxy in the gap between the limiting pressure ring 702 and the accommodating groove. ;

In this embodiment, the connecting rod 704 is an I-beam made of rigid material, which is convenient to obtain, easy to prepare, and has reliable connection strength; the limit pressure ring 702 is prefabricated by ultra-high performance concrete (UHPC) in the factory, and its resistance to The compressive strength is greater than 150MPa, with good crack resistance and durability;

In actual construction, firstly, the lower end of the connecting rod 704 is fixed with the embedded parts in the support structure, and then the vibration damping and leveling layer 5 is laid, and the upper end of the connecting rod 704 extends from the through hole of the vibration damping and leveling layer 5 Then lay the ballastless track unit module 3, and place the connecting rod 704 in the accommodating groove of the ballastless track unit module 3; Direction positioning, and then use self-leveling high damping concrete to pour in the gap between the limit pressure ring 702 and the connecting rod 704 to form the damping connecting column 703, and the damping connecting column 703 fixes the limit pressure ring 702 and the connecting rod 704 At the same time, it has a vibration damping effect on the upper structure of the built-in limit boss 7. The self-leveling performance ensures the construction performance and quality of the concrete, and the high damping performance ensures the vibration reduction effect of the concrete; One of modified polyurethane and polyurethane modified epoxy materials is poured to fill the gap between the limit pressure ring 702 and the inner wall of the accommodating cavity to form an elastic connecting ring 701, so that the ballastless track unit module 3 can be adjusted according to temperature, load Adaptive fine-tuning of the paving position can be carried out according to the situation.

Optionally, the structural shape of the built-in limiting boss 7 can be specifically set according to the specific installation environment of the track, load bearing conditions, stress conditions, and the like. The built-in limiting boss 7 can be one of cylindrical, elliptical, polygonal or girdle cylindrical. The shape of the accommodating cavity matches the shape of the built-in limit boss 7,

The external limiting fastener 8 includes a limiting side stopper 801 ; the external limiting fastener 8 is arranged on both sides of the track plate 302 , and the bottom of the limiting side stopper 801 is anchored by anchor bolts 802 Fixed on the support structure, the middle of the limit side stopper 801 is pressed against the side surface of the track plate 302, and the top of the limit side stopper 801 is buckled on the top surface of the track plate 302. In this embodiment Among them, the limit side stop post 801 is made of prefabricated steel material, which is convenient to obtain materials, standardized in design, industrialized in production, simple and efficient in assembly method and efficiency, and easy to replace. The structural shape of the external limit fastener 8 can be specifically set according to the specific installation environment of the track, load bearing conditions, and stress conditions. In this embodiment, the external limit fastener 8 is L-shaped or Z-shaped.

The present invention also includes a construction method for the assembled ballastless track of a high-speed railway, which is used for constructing the above-mentioned assembled ballastless track structure, and specifically includes the following steps:

a. First, according to the track design, the ballastless track unit module is prefabricated in the factory, the embedded parts are embedded in the support structure of the track, and the connecting rods are vertically fixed on the embedded parts;

b. Then lay a vibration-damping and leveling layer. The vibration-damping and leveling layer is made of cement blanket. Lay the cement blanket on the support structure along the track design direction, and at the same time make the upper end of the connecting rod extend from the through hole of the vibration-damping and leveling layer. Extend, then water the surface of the cement blanket to soften the cement blanket;

c. Lay the ballastless track unit modules end-to-end on the cement blanket, so that the connecting rods are placed in the accommodating groove formed by the connection of the adjacent ballastless track unit modules. Before the cement blanket hardens, according to the design requirements, the ballastless track Example of applying preload to the unit module to realize the leveling of the unit module of the ballastless track;

During the above-mentioned actual fine-leveling construction, machine vision measurement was used to control the elevation and settlement of the base. The set elevation of the ballastless track unit module and the measured elevation of each measuring point obtained by observation are made into data files, and the difference between the elevation of each measuring point and the design elevation, the thickness of each measuring point, and the thickness of each section are obtained through data analysis. Average value, mean square error, and representative value to guide the next adjustment and control.

d. After the cement blanket is hardened, set the limit pressure ring on the connecting rod of the accommodating cavity, and use self-leveling high damping concrete to pour it into the gap between the limit pressure ring and the connecting rod to form a damping connecting column , and then use one of polyurethane, epoxy, epoxy-modified polyurethane, and polyurethane-modified epoxy materials to fill the gap between the limit pressure ring and the inner wall of the accommodating cavity to form an elastic connecting ring;

e. Arrange external limit fasteners on both sides of the ballastless track unit module,

The bottom of the limit side stop is fixed on the support structure by the anchor bolt, the middle of the limit side stop is pressed against the side of the track plate, and the top of the limit side stop is buckled on the track plate. on the top surface.

In step a, the prefabrication process of the ballastless track unit module is as follows: first prefabricate the standard track slab (with door-shaped steel bars), then roughen the bottom of the track slab, spread the fiber material that enhances the interface bonding performance, and finally install it on the bottom of the track slab according to the design. The reinforced concrete layer is cast on the side to realize the superelevation and initial leveling of the track. The above-mentioned prefabricated modules are used to greatly improve the bond strength of the interlayer interface, avoiding the easy interface between layers caused by the "reverse method" construction of the existing track technology. The problem of separation seam reduces the disease of the track structure interface and prolongs the life of the track structure.

Through the above method, when dismantling and maintaining, it is only necessary to remove the external limit fastener, destroy the damping connecting column at the same time, and take out the limit pressure ring to replace the ballastless track unit module.

Example 1:

As shown in FIG. 5 , the vibration damping and leveling layer 5 is directly laid on the roadbed 9 of the railway, and the ballastless track unit modules are then laid on the vibration damping and leveling layer 5 .

Example 2:

As shown in FIG. 6 , the difference from Embodiment 1 is that the vibration damping and leveling layer 5 is directly laid on the box girder 10 of the support 11 on the bridge pier 12 .

The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the patent of the present invention. Under the conception of the present invention, the equivalent structural transformation made by the contents of the description and drawings of the present invention, or directly/indirectly applied to other related All technical fields are included in the scope of patent protection of the present invention.

Claims (10)

1. An assembled ballastless track structure for a high-speed railway, characterized in that it comprises a ballastless track unit module (3), a vibration reduction and leveling layer (5) and a limit connecting rod (704); the limit connection The rod (704) is fixed on the track support structure along the design extension direction of the track, the vibration damping and leveling layer (5) is laid on the track support structure, and the ballastless track unit module (3) is a prefabricated structure, so The ballastless track unit modules (3) are laid end-to-end on the vibration damping and leveling layer (5), and the ballastless track unit modules (3) are fixed on the support structure through limit connecting rods (704). 2 . The assembled ballastless track structure for a high-speed railway according to claim 1 , wherein the vibration damping and leveling layer ( 5 ) adopts a cement blanket. 3 . 3. The assembled ballastless track structure for a high-speed railway according to claim 1, wherein the ballastless track unit module (3) comprises a track plate (302) and a track plate (302) fixed on the track plate (302). Rail bearing platform (301). 4. The assembled ballastless track structure for a high-speed railway according to claim 3, wherein the limit connecting rod (704) comprises a built-in limit boss (7); The built-in limit boss (7) includes an elastic connecting ring (701), a limit pressure ring (702), a damping connecting column (703) and a connecting rod (704). The outer wall is provided with a limit step protruding outward along the circumferential direction, and the inner diameter of the limit pressure ring (702) matches the outer diameter of the connecting rod (704), and the connecting rod (704) is supported by the rail. The embedded parts in the structure are connected and fixed, and the vibration-damping and leveling layer (5) is provided with through holes at positions corresponding to the connecting rods (704), and the connecting rods (704) are adjusted from the vibration reduction through the through holes. The top surface of the flat layer (5) protrudes, the limit pressure ring (702) is sleeved on the connecting rod (704), and the space between the limit pressure ring (702) and the connecting rod (704) is within the gap pouring concrete to form damping connecting columns (703); The centers of the connecting ends of the two adjacent rail plates (302) are respectively provided with accommodating grooves with the same structure and oppositely arranged. The space matches the size of the limit pressure ring (702), and a positioning block is provided on the inner wall of the accommodating groove, the positioning block corresponds to the upper limit step of the limit pressure ring (702), and the positioning block is connected to the limit step through the positioning block. In cooperation, when two adjacent rail plates (302) are assembled, the positioning block is clamped under the limit step to limit the vertical direction of the rail plates (302); after the adjacent rail plates (302) are spliced together, An elastic connecting ring (701) is formed by pouring elastic material in the gap between the limiting pressure ring (702) and the accommodating groove. 5. The assembled ballastless track structure for a high-speed railway 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 for high-speed railway according to claim 4 , wherein the elastic material adopts polyurethane, epoxy, epoxy-modified polyurethane or polyurethane-modified epoxy. 7 . 7 . The assembled ballastless track structure for a high-speed railway according to claim 4 , wherein the built-in limiting bosses ( 7 ) are cylindrical, elliptical, polygonal, or girdle-shaped. 8 . 8. The assembled ballastless track structure for a high-speed railway according to claim 4, wherein the limiting pressure ring (702) is formed by being fixed by two coaxially arranged upper and lower rings, and the limiting pressure ring (702) is The height of the pressure-limiting ring (702) matches the thickness of the track plate (302), and the outer diameter of the upper ring of the pressure-limiting ring (702) is larger than the outer diameter of the lower ring, so that the pressure-limiting ring (702) ), a limit step is formed at the connection between the upper ring and the lower ring. 9. The assembled ballastless track structure for a high-speed railway according to claim 4, wherein the limit connecting rod (704) further comprises an external limit fastener (8), the external limit The fastener (8) includes a limit side stopper (801); the outer limiter fastener (8) is arranged on both sides of the track plate (302), and the bottom of the limit side stopper (801) passes through The anchor bolt (802) is fixed on the support structure, the middle part of the limit side stopper (801) is pressed against the side surface of the track plate (302), and the top of the limit side stopper (801) is buckled On the top surface of the track plate (302). 10. A method for constructing an assembled ballastless track for a high-speed railway, for constructing the assembled ballastless track structure according to claim 9, characterized in that it specifically comprises the following steps: a. First, according to the track design, the ballastless track unit module (3) is prefabricated in the factory, the embedded parts are embedded in the support structure of the track, and the connecting rods (704) are vertically fixed on the embedded parts; b. Then lay the vibration-damping and leveling layer (5). The vibration-damping and leveling layer (5) is made of cement blanket. The cement blanket is laid on the support structure along the track design direction, and at the same time, the upper end of the connecting rod (704) is removed from the The through holes of the vibration reduction and leveling layer (5) are extended, and then water is poured on the surface of the cement blanket to soften the cement blanket; c. Lay the ballastless track unit modules (3) end to end on the cement blanket, so that the connecting rods (704) are placed in the accommodating grooves formed by the connection of the adjacent ballastless track unit modules (3), before the cement blanket hardens , according to the design requirements, apply a preload to the ballastless track unit module (3) to achieve the leveling of the ballastless track unit module (3); d. After the cement blanket is hardened, set the limit pressure ring (702) on the connecting rod (704) of the accommodating cavity, and use self-leveling high damping concrete to pour it on the limit pressure ring (702) and the connecting rod (704). 704), a damping connecting column (703) is formed, and then one of polyurethane, epoxy, epoxy-modified polyurethane, and polyurethane-modified epoxy materials is used to cast and fill the limit pressure ring (702). ) and the inner wall of the accommodating cavity, an elastic connecting ring (701) is formed; e. Arrange external limit fasteners (8) on both sides of the ballastless track unit module (3), The bottom of the limit side stop column (801) is fixed on the support structure by the anchor bolt (802), and the middle part of the limit side stop column (801) is pressed against the side surface of the track plate (302). The top of the limiting side blocking post (801) is buckled on the top surface of the track plate (302).

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