CN114687254A - Assembly type ballastless track based on dry connection and construction method thereof - Google Patents

Abstract

The invention relates to the technical field of railway tracks. The purpose is to provide a dry connection-based assembled ballastless track and a construction method thereof, so as to reduce the cast-in-place amount on the premise of guaranteeing the precision, improve the track laying efficiency and reduce the carbon emission. The technical scheme is as follows: the utility model provides an assembled ballastless track based on dry-type is connected which characterized in that: the ballastless track comprises a base layer, a prefabricated unit and a rail, wherein the prefabricated unit is fixed on the base layer and is longitudinally connected with the base layer; the prefabricated unit comprises a track plate, a vibration damping rubber cushion layer, an isolation layer and a base plate which are sequentially arranged from top to bottom; the base plate is fixed on the base layer through a positioning anchor rod; the track plates are fixed on the base plate through limit stops, and longitudinal weak connection between every two adjacent track plates is realized through anchoring limiters; the limit stop is fixed with the side surface of the track plate through a transverse limit anchor rod and is fixed with the top surface of the base plate through a vertical limit anchor rod; and the top surface of the track slab is provided with a track bearing platform.

Description

Assembly type ballastless track based on dry connection and construction method thereof

Technical Field

The invention relates to the technical field of railway tracks, in particular to a fully-prefabricated assembled ballastless track and a construction method thereof.

Background

The ballastless track has become the main track form of the high-speed railway and the urban track traffic in China due to the characteristics of high stability, high smoothness and less maintenance. At present, ballastless tracks can be divided into prefabricated plate type ballastless tracks and cast-in-place ballastless tracks according to the construction characteristics of track beds. The track bed board of the cast-in-place ballastless track is cast and constructed on site by adopting a mould building method. The upper structure of the prefabricated slab ballastless track is an in-site prefabricated part, has high precision and bearing capacity, and can be configured with prestress according to needs, while the lower structures of the base, the adjusting layer and the like of the prefabricated slab ballastless track are cast in situ, and still need quite large cast-in-situ amount, thus causing the defects of poor in-site operation environment, low structure precision, low efficiency, high carbon emission and the like.

At present, a partially assembled ballastless track also appears in the track traffic market, and the main form is that a track plate with direct bearing is taken as a prefabricated part, and self-compacting concrete with a certain thickness is poured below the track plate.

However, no ballastless track prefabricated by all components exists in the market at present. The factor for restricting the service performance of the partially assembled ballastless track is the self-limiting capacity of the track. In order to ensure the longitudinal and transverse stability of the structure, grooves and through holes are reserved when structures such as a base and the like are poured on the ballastless track, and the reserved grooves/through holes are filled with concrete to form a limiting structure when structures such as an adjusting layer and the like are poured in the later stage. The cast-in-place limiting structure also needs maintenance, and the construction period is prolonged to a certain extent.

In addition, although the limit structure can be embedded in the track in the construction mode, the construction mode has some defects, for example, the pouring quality under the adjusting laminated plate below the track plate is difficult to monitor in real time, and the special quality of the construction mode close to the direct bearing structure causes great influence once the quality problem occurs; on-site experience also shows that many bosses and grooves are damaged in different degrees under the influence of the expansion and contraction effect of concrete, the embedded limiting structures cannot be replaced, and the member procedures related to the cast-in-place part during later maintenance are more complicated.

Based on this, the existing partially-assembled ballastless track structure faces the problems of precision, efficiency, environmental protection and the like caused by large on-site cast-in-place quantity, and simultaneously the problem of easy maintenance of the whole structure is also required to be considered.

Disclosure of Invention

The invention aims to overcome the defects in the background art and provide an assembled ballastless track based on dry connection and a construction method thereof, so as to reduce the cast-in-place amount, improve the track laying efficiency and reduce the carbon emission on the premise of ensuring the precision.

The technical scheme of the invention is as follows:

the utility model provides an assembled ballastless track based on dry-type is connected which characterized in that: the ballastless track comprises a base layer, a prefabricated unit and a rail, wherein the prefabricated unit is fixed on the base layer and is longitudinally connected with the base layer; the prefabricated unit comprises a track plate, a vibration damping rubber cushion layer, an isolation layer and a base plate which are sequentially arranged from top to bottom; the base plate is fixed on the base layer through a positioning anchor rod; the track plates are fixed on the base plate through limit stops, and longitudinal weak connection between every two adjacent track plates is realized through anchoring limiters; the limit stop is fixed with the side surface of the track plate through a transverse limit anchor rod and is fixed with the top surface of the base plate through a vertical limit anchor rod; and the top surface of the track slab is provided with a track bearing platform for bearing a track.

Anchoring lifting lugs are fixed on two sides of the track plate; the anchoring limiting device comprises a limiting tooth block and a limiting screw rod which are connected, the limiting screw rod is fixed with the anchoring lifting lug through a limiting nut, and the limiting tooth blocks of the two anchoring limiting devices which are positioned on the same side of the adjacent track plates are meshed with each other.

The track plate and the base plate are rectangular plates made of reinforced concrete; the length of the track plate is 3.25-3.75m, the width is 2.5m, and the thickness is 0.2 m; the length of the base plate is equal to that of the track plate, the width of the base plate is 3.1m, and the thickness of the base plate is 0.2 m.

The base plate is provided with a positioning anchoring through hole and an anchoring long hole which are arranged close to the edges of the two sides; the lower part of the positioning anchor rod is embedded in the concentrated layer, the upper part of the positioning anchor rod vertically penetrates through the positioning anchoring through hole and then is meshed with the positioning nut, and the positioning anchor rod is fixed in the positioning anchoring through hole through grouting.

The left side surface and the right side surface of the track plate are provided with a short limiting hole and a long limiting hole; the anchoring lifting lug is fixed with the track plate through an anchoring bolt arranged in the limit short hole; hoisting holes for installing temporary lifting lugs are formed in the front end face and the rear end face of the base plate; and a grouting hole is formed in the middle of the base plate.

The limiting stop block is provided with a vertical through hole corresponding to the anchoring long hole and a transverse through hole corresponding to the limiting long hole; the transverse limiting anchor rod extends into the transverse through hole and the limiting long hole and is also meshed with the transverse nut; the vertical limiting anchor rod extends into the vertical through hole and the anchoring long hole and is also meshed with the vertical nut; and geotextile is arranged between the limit stop and the track plate and between the limit stop and the base plate.

Sleeves are pre-buried in the anchoring long hole, the limiting short hole, the limiting long hole, the vertical through hole, the transverse through hole and the hoisting hole; rubber gaskets are arranged between the anchoring lifting lug and the track plate and between the temporary lifting lug and the base plate; and gaskets are arranged between the transverse nut and the limit stop, between the vertical nut and the limit stop and between the positioning nut and the base plate.

A construction method of an assembled ballastless track comprises the following steps:

s1, constructing a base layer on site, embedding a positioning anchor rod during base layer construction, calibrating and leveling the verticality and height of the positioning anchor rod, and checking the flatness of the base layer after the base layer is finished; manufacturing a track plate, a base plate and a limit stop in a factory and transporting the track plate, the base plate and the limit stop to a site;

s2, laying an isolation layer on a base plate and installing temporary lifting lugs, hoisting the base plate to a base layer by using a hoisting tool, enabling positioning anchor rods to penetrate through corresponding positioning anchor through holes in the base plate, measuring and recording the length of each positioning anchor rod extending out of the positioning anchor through holes, grouting in the positioning anchor through holes, installing positioning nuts at the top ends of the positioning anchor rods, and dismantling the temporary lifting lugs and the hoisting tool;

s4, attaching a vibration damping rubber cushion layer to the bottom surface of the track slab, installing anchoring lifting lugs on two sides of the track slab, lifting the track slab by using a lifting tool, visually checking the attachment quality of the vibration damping rubber cushion layer, lifting the track slab onto a base plate, and removing the lifting tool;

s5, laying geotextile on the top surface of the base plate and the side surface of the track plate, placing the limit stop at two sides of the track plate, installing a transverse limit anchor rod to fix the limit stop with the track plate, and installing a vertical limit anchor rod to fix the limit stop with the base plate;

s6, mounting anchoring limiters on the anchoring lifting lugs to enable the track slabs to be longitudinally weakly connected;

s7, spraying antirust paint on the exposed parts of the connecting pieces, and spraying waterproof joint sealing materials on the gaps between the track plates and the gaps between the base plates;

and S8, recording the length of the positioning anchor rod on a rail bearing platform to adjust the smoothness of the pre-cushion plate, laying the rail after the smoothness is measured again, and further arranging the rail after the rail is laid.

When the base layer flatness is more than 1.5mm/1m, step S2 is: place a plurality of wooden cushion blocks in the basic unit, lay the isolation layer on the bed plate and adorn interim lug, use the instrument of lifting by crane with the bed plate hoist and mount to wooden cushion block on, make the location stock pass the location anchor through-hole that corresponds on the bed plate, build the template that the round surrounds the bed plate in the basic unit, pour concrete to the grout hole of bed plate, form the supporting layer that bears the bed plate after the concrete sets, measure and record each location stock and stretch out the length of location anchor through-hole again, slip casting in the location anchor through-hole, install set nut on location stock top.

The connecting piece comprises a transverse limiting anchor rod, a transverse nut, a vertical limiting anchor rod, a vertical nut, an anchoring lifting lug, an anchoring bolt, a positioning anchor rod, a positioning nut and an anchoring limiter.

The invention has the beneficial effects that:

the invention provides an assembled ballastless track based on dry connection and a construction method thereof, main components of the ballastless track can be prefabricated, the structure is novel, the design is reasonable, the installation can be completed only by simply assembling by using mechanized equipment on site, the quality and the precision of a bearing component are improved on the premise of ensuring the precision, the cast-in-place quantity is reduced, the track laying efficiency is improved, the carbon emission is reduced, the assembled ballastless track has the advantage of environmental friendliness, and the application prospect is wide;

in the assembled ballastless track, the main structures such as the track plate, the bed plate and the like are all changed into workshop prefabrication, so that the component precision is greatly improved, the on-site concrete pouring amount is reduced, the maintenance period and the carbon emission are further reduced, and the construction efficiency is improved; the damping rubber cushion layer is used as an adjusting layer, so that the elasticity of the track is ensured to a certain extent, the influence of vibration noise on the surrounding environment is reduced, and meanwhile, the mounting quality and the construction efficiency of the damping rubber cushion layer are also ensured by adopting a mounting mode of laminating the bottom of the track plate in advance; the prefabricated track slab and the base plate adopt a design mode of short units, and the self weight of each unit is lighter, so that the mechanized batch construction is facilitated, and the construction convenience and efficiency are improved; the integrity between the track plate and the base plate is ensured by arranging limit stops at the side edges and performing mechanical anchoring; the construction method of pre-burying the positioning anchor rod ensures the high-precision assembly of the bed plate and the anchoring capability with the base layer, and simultaneously, after grouting, the positioning anchor rod can also be used as the grounding steel bar of the bed plate, thereby achieving the effect of one object with multiple purposes; the anchoring limiting device similar to a switch tongue limiting device is used as a longitudinal anchoring device between the plates, so that longitudinal force transmission of the track plate is ensured, meanwhile, the gap design between the rubber gasket and the track plate does not cause the problem of temperature adaptability of a longitudinally-connected track, and a certain temperature stress diffusion capability can be maintained;

the ballastless track integrally adopts a dry type connecting and assembling mode mainly comprising the anchor rod, so that when the structure has problems due to disasters such as earthquake, settlement and the like, the limiting and unlocking can be easily realized by unlocking the anchor rod, and the lightweight prefabricated units are replaced, maintained and the like, so that the maintainability and the emergency recovery capability of the track are greatly improved; meanwhile, the anchor rod under the complex service environment has better durability and stability; in addition, each prefabricated part of the ballastless track is of a conventional rectangular structure, a special-shaped plate does not exist, the prefabrication is simple, and the precision is guaranteed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic diagram of the overall assembly of the assembly type ballastless track (the track is omitted) in the invention.

Fig. 2 is a front view schematically showing the structure of fig. 1.

Fig. 3 is a schematic top view of the structure of fig. 1.

Fig. 4 is a schematic layered diagram of the fabricated ballastless track of the present invention.

Fig. 5 is a schematic layered diagram of a prefabricated unit of the fabricated ballastless track of the present invention.

Fig. 6 is a schematic structural diagram of a base plate of the fabricated ballastless track of the invention.

Fig. 7 is a schematic structural diagram of a track slab of the fabricated ballastless track of the invention.

Fig. 8 is a schematic structural diagram of a limit stop of the fabricated ballastless track of the invention.

Fig. 9 is a schematic structural diagram of an anchoring stopper of the fabricated ballastless track of the present invention.

Fig. 10 is a schematic view of a connection mode of the anchoring stopper of the fabricated ballastless track according to the present invention.

Fig. 11 is a schematic view of a construction method of the fabricated ballastless track of the invention.

Fig. 12 is a second schematic view of the assembly ballastless track construction method of the invention.

Fig. 13 is a third schematic view of the construction method of the fabricated ballastless track of the invention.

Fig. 14 is a fourth schematic view of the assembly type ballastless track construction method of the invention.

Fig. 15 is a fifth schematic view of the assembly type ballastless track construction method of the invention.

Fig. 16 is a sixth schematic view of the assembly type ballastless track construction method of the invention.

Fig. 17 is a seventh schematic view of the assembly type ballastless track construction method of the invention.

Fig. 18 is an eighth schematic view of the assembly type ballastless track construction method of the invention.

Fig. 19 is a ninth schematic view of the assembly type ballastless track construction method of the invention.

Fig. 20 is a tenth schematic diagram of the construction method of the fabricated ballastless track of the present invention.

Fig. 21 is an eleventh schematic view of the assembly type ballastless track construction method according to the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 the description of the present invention, it should be noted that certain terms of orientation or positional relationship are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that "connected" is to be understood broadly, for example, it may be fixed, detachable, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings. And the examples do not constitute a limitation on the embodiments of the invention.

As shown in fig. 1-5, a fabricated ballastless track based on dry connection comprises a substrate, a prefabricated unit and a rail (omitted in the figures).

The base layer 18 is a lower foundation of the ballastless track and needs to be constructed on site. The base layer is made of reinforced concrete poured on the ground or a bridge, and the model of the concrete is C40. Be equipped with two rows of location stock 7 on the basic unit, the location stock is vertical to be arranged, and the lower part of location stock is plain noodles rod iron and pre-buried in the layer of gathering, and the upper portion of location stock is for upwards stretching out basic unit top surface and take the screwed rod iron, and the length on location stock upper portion slightly is greater than 0.25 m.

The prefabricated units are fixed on the base layer and are longitudinally connected along the length direction (the horizontal direction in figure 2) of the rail, and each prefabricated unit comprises a rail plate 1, a damping rubber cushion layer 2, an isolation layer 3 and a base plate 4 which are sequentially arranged from top to bottom.

The base plate is a rectangular plate and made of reinforced concrete, the type of the concrete is C40, the length (horizontal direction in fig. 3) of the base plate is equal to that of the track plate, the width (vertical direction in fig. 3) of the base plate is 3.1m, and the thickness (vertical direction in fig. 2) of the base plate is 0.2 m. And a grouting hole 16 (the inner diameter is 180mm) is formed in the middle of the base plate. As shown in fig. 6, the front and rear end faces of the base plate (the front and rear end faces face the other base plate and the front and rear end faces are perpendicular to the side face 4.1 of the rail) are provided with lifting holes 14, the lifting holes are used for installing temporary lifting lugs 28 by using temporary bolts (omitted in the figure) during construction, sleeves (omitted in the figure, the diameter of the sleeves is generally 26mm to match the existing lifting lug specification) are embedded in the lifting holes, rubber gaskets (omitted in the figure) need to be arranged between the temporary lifting lugs and the base plate, and each end face of the base plate shown in fig. 6 is provided with two pairs of lifting holes. The top surface of the base plate is pasted with an isolating layer. The isolation layer is made of geotextile.

The base plate is provided with two rows of through holes, as shown in fig. 6, which are respectively arranged close to the edges of both sides of the base plate (parallel to the edges of the rails). Each row of through holes comprises positioning anchoring through holes 12 and anchoring long holes 13, the positioning anchoring through holes are used for being matched with positioning anchor rods to penetrate, and the anchoring long holes are used for being matched with vertical limiting anchor rods to penetrate. Each row of through holes comprise 4 positioning anchoring through holes and 1 anchoring long hole, the positioning anchoring through holes are uniformly arranged along the edge, and the anchoring long holes are arranged in the middle of the edge. Sleeves (omitted in the figure) are embedded in the anchoring long holes.

The base plate is fixed with the positioning anchor rod of the base layer. Two rows of positioning anchor rods on the base layer respectively upwards penetrate through two rows of positioning and anchoring through holes on the base plate, the positioning nuts 19 are installed at the top ends of the positioning anchor rods, and meanwhile grouting is carried out in the positioning and anchoring through holes to fix the positioning anchor rods, so that positioning and anchoring of the base plate are completed.

The track slab is a rectangular slab and is made of reinforced concrete, the type of the concrete is C60, the top surface of the track slab is provided with two rows of track bearing platforms 9, a rail is fixed on the track bearing platforms through fasteners (omitted in the figure), the bottom surface of the track slab is adhered with a vibration reduction rubber cushion layer, the length of the track slab is 3.25-3.75m, the width of the track slab is 2.5m, and the thickness of the track slab is 0.2 m.

As shown in fig. 7, the left and right side surfaces (the side surface 1.1 parallel to the rail) of the track slab are provided with a limit short hole 10 and a limit long hole 11, the middle part of each side surface is provided with a pair of limit long holes, and both ends of each side surface in the length direction are respectively provided with a pair of limit short holes. The track plate is fixed with anchoring lifting lugs 15, the anchoring lifting lugs are respectively fixed at two ends of the left side surface and the right side surface of the track plate in the length direction, each anchoring lifting lug is fixed with the track plate through an anchoring bolt (omitted in the figure) arranged in a pair of limiting short holes, and a rubber gasket (omitted in the figure) is arranged between each anchoring lifting lug and the track plate. Sleeves (omitted in the drawing, the diameter of the sleeve is generally 26mm to match the specification of the existing lifting lug) are embedded in the limiting short holes and the limiting long holes.

The track board passes through limit stop 5 and is fixed with the bed plate, and limit stop sets up in the top of bed plate and the both sides of track board, is equipped with geotechnological cloth (omitting in the figure) between limit stop and the track board, also is equipped with geotechnological cloth (omitting in the figure) between limit stop and the bed plate. The limiting stop is provided with a vertical through hole 5.1 and a transverse through hole 5.2, the vertical through hole is vertically arranged and corresponds to the position of the anchoring long hole, and the transverse through hole is horizontally arranged and corresponds to the position of the limiting long hole. The limit stop is fixed with the side face of the track plate through a transverse limit anchor rod 6.1 and is fixed with the top face of the base plate through a vertical limit anchor rod 6.2. The transverse limiting anchor rods are horizontally arranged and perpendicular to the rails, one ends of the transverse limiting anchor rods extend into the transverse through holes and the limiting long holes, and the other ends of the transverse limiting anchor rods are meshed with the transverse nuts 23. The vertical limiting anchor rod is vertically arranged and perpendicular to the rail, one end of the vertical limiting anchor rod extends into the vertical through hole and the anchoring long hole, and the other end of the vertical limiting anchor rod is meshed with the vertical nut 24. Gaskets (omitted in the drawing) are arranged between the vertical nut and the limit stop, between the transverse nut and the limit stop and between the positioning nut and the base plate.

Sleeves (omitted in the drawing) are embedded in the vertical through holes and the transverse through holes. The transverse limiting anchor rod and the vertical limiting anchor rod are both made of deformed steel bars, the transverse limiting anchor rod is meshed with sleeve threads in the transverse through hole and the limiting long hole, and the vertical limiting anchor rod is meshed with sleeve threads in the vertical through hole and the anchoring long hole.

And the two adjacent track plates are longitudinally and weakly connected through the anchoring limiter 17. The anchoring limiting devices are fixed with the anchoring lifting lugs, and the two anchoring limiting devices arranged on the same side of the adjacent track plates are connected with each other. The anchoring limiter comprises a limiting tooth block 20 and a limiting screw rod 21, limiting teeth are formed on the limiting tooth block, and one end of the limiting screw rod is fixed with the limiting tooth block. The limit screw is fixed with the anchoring lifting lug through a pair of limit nuts 22. The limit teeth of two connected anchoring limiters are meshed with each other. And two adjacent track plates are weakly connected through two pairs of connected anchoring limiters.

A construction method of an assembled ballastless track comprises the following steps:

s1, as shown in figure 11, a base layer is constructed on site, positioning anchor rods are pre-embedded and the verticality and the height of the positioning anchor rods are calibrated and leveled during base layer construction, the base layer flatness is checked after the base layer is finished, and the base layer needs to meet the flatness requirement of 1.5mm/1 m;

manufacturing a track plate, a base plate and a limit stop in a factory and conveying the track plate, the base plate and the limit stop to the site; the length of the track plate is 3.73m, the width of the track plate is 2.5m, the front-back distance of the track bearing platform is 0.63m, and the joint distance between the plates of the track plate is 0.05m, so that the track plate can meet the requirement of laying most lines requiring fastener distance of 0.63 m;

s2, as shown in FIG. 12, temporary lifting lugs 28 are installed at the two ends of the base plate by using temporary bolts, the base plate is lifted to a base layer by using lifting tools (a crane, a lifting tool 26 and a steel wire rope 27), so that the positioning anchor rods penetrate through corresponding positioning and anchoring through holes (shown in FIG. 13) on the base plate, the length of each positioning anchor rod extending out of the positioning and anchoring through hole is measured and recorded, grouting is carried out in the positioning and anchoring through holes, positioning nuts are installed at the top ends of the positioning anchor rods, the temporary lifting lugs and the lifting tools are removed, and an isolation layer (shown in FIG. 15) is laid on the base plate;

when the difficult area can not meet the requirement of the base layer flatness (the flatness is more than 1.5mm/1m), leveling operation is required, and the step S2 is performed; as shown in fig. 14, a wood pad 29 is placed on the top surface of the base plate near each positioning anchor rod, the size of the wood pad is 200mm × 200mm × 50mm, temporary lifting lugs 28 are installed at both ends of the base plate, the base plate is lifted onto the wood pad of the base layer by using a lifting tool, so that the positioning anchor rods pass through the corresponding positioning anchor through holes on the base plate, a circle of template (omitted in the figure) surrounding the base plate is built on the base layer, self-compacting concrete (model C30) is poured into the grouting holes of the base plate, a supporting layer (omitted in the figure) of the base plate is formed after the concrete is solidified, the length of each positioning anchor rod extending out of the positioning anchor through holes is measured and recorded, grouting is performed in the positioning anchor through holes, positioning nuts are installed at the top ends of the positioning anchor rods, the temporary lifting lugs and the lifting tools are removed, and an isolating layer is laid on the base plate; the adjacent base plates need to be leveled at the same time;

when the base plate is lifted, the plate body must be kept to move horizontally slowly, and before the base plate is placed downwards, marks need to be made on a base layer to prevent position deviation;

s4, as shown in fig. 16 and 17, attaching a vibration damping rubber pad layer to the bottom surface of the track slab, installing anchoring lifting lugs on both sides of the track slab, lifting the track slab by using a lifting tool, visually checking the attachment quality of the vibration damping rubber pad layer, lifting the track slab onto a base plate, and removing the lifting tool;

when the track slab is hoisted, the slab body must be kept to move horizontally slowly, and before the track slab is put down, a mark needs to be made on the base plate to prevent position deviation;

s5, as shown in fig. 18 and 19, geotextiles are laid on the top surface of the base plate and the side surface of the track plate, the limit stops are placed on both sides of the track plate, the transverse limit anchor rods are installed to fix the limit stops with the track plate, and the vertical limit anchor rods are installed to fix the limit stops with the base plate;

s6, as shown in fig. 20 and 21, mounting an anchoring stopper on the anchoring shackle to achieve a weak longitudinal connection between the track plates;

s7, spraying antirust paint on the exposed part of the connecting piece, filling the gap between the track plates and the gap between the base plates with a polyethylene foam plastic plate, and then spraying waterproof joint sealing materials;

the connecting piece comprises a transverse limiting anchor rod, a transverse nut, a vertical limiting anchor rod, a vertical nut, an anchoring lifting lug, an anchoring bolt, a positioning anchor rod, a positioning nut and an anchoring limiter;

and S8, recording the length of the positioning anchor rod on a rail bearing platform, pre-cushioning the slab, adjusting the smoothness (pre-cushioning a height-adjusting cushion plate of a fastener on the rail bearing platform for the purpose of following a slope), laying the rail after re-measuring the smoothness, and further adjusting the rail after laying the rail (adjusting and accepting the irregularity of the rail).

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. The utility model provides an assembled ballastless track based on dry-type is connected which characterized in that: the ballastless track comprises a base layer, a plurality of prefabricated units which are fixed on the base layer (18) and are longitudinally connected, and rails which are fixed on the prefabricated units; the prefabricated unit comprises a track plate (1), a vibration reduction rubber cushion layer (2), an isolation layer (3) and a base plate (4) which are sequentially arranged from top to bottom; the base plate is fixed on the base layer through a positioning anchor rod (7); the track plates are fixed on the base plate through limit stops (5), and longitudinal weak connection between every two adjacent track plates is realized through anchoring limiters (17); the limit stop is fixed with the side surface of the track plate through a transverse limit anchor rod (6.1) and is fixed with the top surface of the base plate through a vertical limit anchor rod (6.2); and the top surface of the track plate is provided with a track bearing platform (9) for bearing a track.

2. The assembled ballastless track based on dry connection of claim 1, wherein: anchoring lifting lugs (15) are fixed on two sides of the track slab; the anchoring limiting device comprises a limiting tooth block (20) and a limiting screw rod (21) which are connected, the limiting screw rod is fixed with the anchoring lifting lug through a limiting nut (22), and the limiting tooth blocks of the two anchoring limiting devices which are positioned on the same side of the adjacent track plates are meshed with each other.

3. The assembled ballastless track based on dry connection of claim 2, wherein: the track plate and the base plate are rectangular plates made of reinforced concrete; the length of the track plate is 3.25-3.75m, the width is 2.5m, and the thickness is 0.2 m; the length of the base plate is equal to that of the track plate, the width of the base plate is 3.1m, and the thickness of the base plate is 0.2 m.

4. The assembled ballastless track based on dry connection of claim 3, wherein: the base plate is provided with a positioning anchoring through hole (12) and an anchoring long hole (13) which are arranged close to the edges of the two sides; the lower part of the positioning anchor rod is embedded in the concentrated layer, the upper part of the positioning anchor rod vertically penetrates through the positioning anchoring through hole and then is meshed with the positioning nut (19), and the positioning anchor rod is fixed in the positioning anchoring through hole through grouting.

5. The assembled ballastless track based on dry connection of claim 4, wherein: the left side surface and the right side surface of the track slab are provided with a short limiting hole (10) and a long limiting hole (11); the anchoring lifting lug is fixed with the track plate through an anchoring bolt arranged in the limit short hole; hoisting holes (14) for installing temporary lifting lugs are formed in the front end face and the rear end face of the base plate; and a grouting hole (16) is formed in the middle of the base plate.

6. The assembled ballastless track based on dry connection of claim 5, wherein: the limit stop is provided with a vertical through hole (5.1) corresponding to the anchoring long hole and a transverse through hole (5.2) corresponding to the limit long hole; the transverse limiting anchor rod extends into the transverse through hole and the limiting long hole and is also meshed with a transverse nut (23); the vertical limiting anchor rod extends into the vertical through hole and the anchoring long hole and is also meshed with a vertical nut (24); and geotextile is arranged between the limit stop and the track plate and between the limit stop and the base plate.

7. The assembled ballastless track based on dry connection of claim 6, wherein: sleeves are pre-buried in the anchoring long hole, the limiting short hole, the limiting long hole, the vertical through hole, the transverse through hole and the hoisting hole; rubber gaskets are arranged between the anchoring lifting lug and the track plate and between the temporary lifting lug and the base plate; and gaskets are arranged between the transverse nut and the limit stop, between the vertical nut and the limit stop and between the positioning nut and the base plate.

8. The construction method of the fabricated ballastless track of any one of claims 1 to 7, comprising the steps of:

s1, constructing a base layer on site, embedding a positioning anchor rod during base layer construction, calibrating and leveling the verticality and height of the positioning anchor rod, and checking the flatness of the base layer after the base layer is finished; manufacturing a track plate, a base plate and a limit stop in a factory and transporting the track plate, the base plate and the limit stop to a site;

s2, installing temporary lifting lugs on the base plate, lifting the base plate to a base layer by using a lifting tool, enabling the positioning anchor rods to penetrate through corresponding positioning anchor through holes in the base plate, measuring and recording the length of each positioning anchor rod extending out of the positioning anchor through holes, grouting in the positioning anchor through holes, installing positioning nuts at the top ends of the positioning anchor rods, removing the temporary lifting lugs and the lifting tool, and laying an isolating layer on the base plate;

s4, attaching a vibration damping rubber cushion layer to the bottom surface of the track slab, installing anchoring lifting lugs on two sides of the track slab, lifting the track slab by using a lifting tool, visually checking the attachment quality of the vibration damping rubber cushion layer, lifting the track slab onto a base plate, and removing the lifting tool;

s5, laying geotextile on the top surface of the base plate and the side surface of the track plate, placing the limit stop at two sides of the track plate, installing a transverse limit anchor rod to fix the limit stop with the track plate, and installing a vertical limit anchor rod to fix the limit stop with the base plate;

s6, mounting anchoring limiters on the anchoring lifting lugs to enable the track slabs to be longitudinally weakly connected;

s7, spraying antirust paint on the exposed part of the connecting piece, and spraying waterproof sealing materials on the gaps between the track plates and the gaps between the base plates;

and S8, recording the length of the positioning anchor rod on a rail bearing platform to adjust the smoothness of the pre-cushion plate, laying the rail after the smoothness is measured again, and further arranging the rail after the rail is laid.

9. The construction method of the fabricated ballastless track of claim 8, wherein: when the base layer flatness is more than 1.5mm/1m, step S2 is: place a plurality of wooden cushion blocks on the basic unit, install interim lug on the bed plate, use the instrument of lifting by crane with the bed plate hoist and mount on wooden cushion block, make the location stock pass the location anchor through-hole that corresponds on the bed plate, build the template that the round surrounds the bed plate in the basic unit, pour the concrete to the grout hole of bed plate, form the supporting layer that bears the weight of the bed plate after the concrete sets, measure and take notes each location stock and stretch out the length of location anchor through-hole, slip casting in the location anchor through-hole, at location stock top installation set nut, lay the isolation layer on the bed plate.

10. The construction method of the fabricated ballastless track of claim 9, wherein: the connecting piece includes horizontal spacing stock, horizontal nut, vertical spacing stock, vertical nut, anchor lug, anchor bolt, location stock, set nut, anchor stopper.

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