CN214656016U - Prefabricated track plate structure - Google Patents

Abstract

The utility model relates to a track board technical field especially relates to a prefabricated track slab structure. Above-mentioned prefabricated track slab structure is equipped with the heavy mouthful that subtracts that runs through prefabricated track board including prefabricated track board, the middle part of prefabricated track board, and the top that subtracts the heavy mouthful outwards extends in order to form the second mounting groove, and detachable installs in the second mounting groove and adds heavy piece. The utility model discloses in, prefabricated track board is provided with subtracts heavy mouthful, so prefabricated track board's weight is less, is convenient for construct; and the weighting pieces with different masses are additionally arranged in the weighting openings, so that the vibration participating mass of the prefabricated track slab can be changed, and the vibration damping performance can be adjusted, therefore, the prefabricated track slabs with uniform specifications can be adopted in the common road section and the vibration damping road section, and the application range is wider.

Description

Prefabricated track plate structure

Technical Field

The utility model relates to a track board technical field especially relates to a prefabricated track slab structure.

Background

Most ballastless track structures adopted by urban rail transit in China are cast-in-place track bed boards. The cast-in-place track bed slab has the defects of large engineering quantity, low construction speed, high noise generated by concrete vibration, poor construction precision and quality, poor maintainability and the like. For example, the ballastless track structure of the cast-in-place integral track bed with the embedded long sleeper and the embedded short sleeper, which is widely applied, has various defects of track bed plate cracking, sleeper looseness, poor track geometric shape and position and the like during operation, and the maintenance workload is increased. In order to overcome the defects, a ballastless track structure adopting the prefabricated track plate becomes the technical development direction of urban rail transit tracks.

However, urban rail transit has higher requirements on vibration reduction, and the existing rail plate used as a vibration reduction section is often larger in weight and size, inconvenient to construct and even impossible to realize the unification of the rail plate type with that of a common section; and the vibration absorption quality of the structure on the track slab is fixed, so that once the vibration absorption performance can not be adjusted, the application range is limited.

SUMMERY OF THE UTILITY MODEL

The utility model provides a promote damping performance's prefabricated track plate structure.

Above-mentioned prefabricated track slab structure is equipped with the heavy mouthful that subtracts that runs through prefabricated track board including prefabricated track board, the middle part of prefabricated track board, and the top that subtracts the heavy mouthful outwards extends in order to form the second mounting groove, and detachable installs in the second mounting groove and adds heavy piece.

Optionally, the weight part comprises a weight block and an extension plate formed by extending the top of the weight block outwards in the circumferential direction; when the weighting piece is matched with the second mounting groove, the weighting block is positioned in the weight-reducing port, and the extension plate is positioned in the second mounting groove.

Optionally, an elastic cushion plate is arranged between the bottom wall of the second mounting groove and the extension plate.

Optionally, the bottom wall of the second mounting groove is connected with the extension plate through a third bolt extending vertically.

Optionally, in the direction of the length of the prefabricated track slab, both ends of the prefabricated track slab are provided with notches which vertically penetrate through the prefabricated track slab.

Optionally, in the direction of the width of the prefabricated track slab, two side portions of the prefabricated track slab are provided with limiting blocks.

Optionally, first sleeves are embedded in the two side portions of the prefabricated track plate, first bolts are arranged in the limiting blocks in a penetrating mode, and threaded ends of the first bolts are in threaded connection with the first sleeves, so that the limiting blocks are installed on the side portions of the prefabricated track plate.

Optionally, one side of the limiting block, which faces away from the prefabricated track slab, is provided with a first mounting groove, the head of the first bolt is pressed against the bottom wall of the first mounting groove, and a sealing cover is arranged in the first mounting groove to seal the head of the first bolt.

Optionally, an elastic cushion layer is arranged between the limiting block and the prefabricated track slab.

Optionally, an elastic cushion plate is arranged at the bottom side of the limiting block.

The embodiment of the utility model provides a technical scheme compares with prior art and has following advantage:

the prefabricated track plate is provided with the weight reducing port, so that the prefabricated track plate is light in weight and convenient to construct; and the weighting pieces with different masses are additionally arranged in the weighting openings, so that the vibration participating mass of the prefabricated track slab can be changed, and the vibration damping performance can be adjusted, therefore, the prefabricated track slabs with uniform specifications can be adopted in the common road section and the vibration damping road section, and the application range is wider.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

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 for those skilled in the art that other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic view of a track structure according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;

fig. 4 is an installation schematic diagram of a limiting block in an embodiment of the present invention;

fig. 5 is a schematic view of a prefabricated track slab according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating an installation of the weight member according to an embodiment of the present invention;

fig. 7 is a schematic view illustrating an installation of a grating cover plate according to an embodiment of the present invention;

fig. 8 is an installation diagram of the connection device according to an embodiment of the present invention.

Wherein, 1, a substrate backfill layer; 2. a concrete adjustment layer; 3. secondary pouring of the layer; 4. prefabricating a track slab; 5. a limiting block; 6. a first elastic layer; 7. a drainage ditch; 8. a second elastic layer; 9. a first sleeve; 10. a first bolt; 11. a first mounting groove; 12. a sealing cover; 13. a weighting block; 14. an extension plate; 15. a notch; 16. a second sleeve; 17. a steel plate; 18. a second bolt; 19. a grid cover plate; 20. grouting holes; 21. a rail bearing platform; 22. an elastic backing plate; 23. a third bolt; 24. a third sleeve; 25. a second mounting groove; 26. a weight-reducing opening.

Detailed Description

In order that the above objects, features and advantages of the present invention may be more clearly understood, the aspects of the present invention will be further described below. It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the invention may be practiced in other ways than those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present invention, and not all of the embodiments.

As shown in fig. 1 to 3, the present invention provides a track structure, which includes a foundation backfill layer 1, a concrete adjustment layer 2 and two secondary casting layers 3 distributed at intervals transversely are disposed on the top side of the foundation backfill layer 1, and the concrete adjustment layer 2 is disposed between the two secondary casting layers 3; a prefabricated track plate 4 is arranged on the top side of the concrete adjusting layer 2, and the prefabricated track plate 4 is positioned between the two secondary pouring layers 3; two lateral parts of the prefabricated track slab 4 are provided with limiting blocks 5, and the limiting blocks 5 are embedded into the adjacent secondary pouring layers 3.

In this embodiment, the base backfill layer 1 may be an inverted arch layer, the concrete adjustment layer 2 may be a self-compacting concrete layer, the secondary casting layer 3 may be a concrete casting layer, and the precast track slab 4 may be a precast slab for a track (such as a prestressed track slab or a non-prestressed track slab), which are not described in detail in this embodiment. The limiting block 5 can be common precast concrete and is detachably connected with the precast track slab 4; the limiting block 5 can be a projection integrally formed with the prefabricated track plate 4. In addition, as is well known to those skilled in the art, the top side of the prefabricated track slab 4 is provided with a rail support platform 21, a fastener assembly, a steel rail and the like, and the description of the embodiment is omitted.

Two lateral parts of prefabricated track board 4 all are equipped with stopper 5 to stopper 5 imbeds in the adjacent secondary layer of pouring 3, so the longitudinal movement of prefabricated track board 4 is pour layer 3 by the secondary and restricts, has promoted the stability of prefabricated track board 4. And the prefabricated track slab 4 is clamped between the two secondary pouring layers 3, and the transverse movement of the prefabricated track slab 4 can be limited. Preferably, two or more limiting blocks 5 may be disposed at intervals on each side of the prefabricated track slab 4 to further improve the stability of the prefabricated track slab 4.

In addition, longitudinal refers to the direction in which the rail extends or lays, as will be understood by those skilled in the art; or the longitudinal direction means the length direction of the prefabricated rail plate 4.

Further, as shown in fig. 4, first sleeves 9 are embedded in two sides of the prefabricated track slab 4, first bolts 10 penetrate through the limiting blocks 5, and threaded ends of the first bolts 10 are in threaded connection with the first sleeves 9, so that the limiting blocks 5 are installed on the sides of the prefabricated track slab 4. The side of the limiting block 5 facing away from the prefabricated track slab 4 is provided with a first mounting groove 11, the head of the first bolt 10 is pressed against the bottom wall of the first mounting groove 11, and a sealing cover 12 is arranged in the first mounting groove 11 to seal the head of the first bolt 10.

In this embodiment, the first bolt 10 may transversely penetrate through the limiting block 5 and be threadedly connected with the first sleeve 9 in the side portion of the prefabricated track slab 4, so that the limiting block 5 is detachably connected with the prefabricated track slab 4. As will be appreciated by those skilled in the art, both sides of the prefabricated track slab 4 are generally provided with a plurality of sleeve members, i.e., first sleeves 9 in this embodiment, for hoisting the prefabricated track slab 4 and adjusting the position of the prefabricated track slab 4. Through setting up stopper 5 and prefabricated track board 4 to be connected for dismantling, prefabricated track board 4 original structure is not changed, but also utilizes the original first sleeve 9 of prefabricated track board 4, has reduced the manufacturing cost of prefabricated plate. But also can change the prefabricated section of different volumes, shape according to operating condition to promote spacing effect. Preferably, both ends of each side portion of the prefabricated track slab 4 are provided with a plurality of first sleeves 9, each side portion can be provided with two limiting blocks 5, and each limiting block 5 is fixed on the side portion of the prefabricated track slab 4 through a plurality of first bolts 10.

In addition, since the head of the first bolt 10 is positioned in the first installation groove 11 and sealed by the sealing cap 12, the head of the first bolt 10 is not submerged by concrete when the secondary casting layer 3 is cast. When it is necessary to repair the foundation backfill layer 1 or replace the prefabricated track slab 4, the first bolt 10 can be easily removed. Preferably, the first mounting groove 11 is a circular truncated cone-shaped mounting groove to facilitate mounting of the sealing cover 12.

Further, as shown in fig. 2, an elastic pad 22 is disposed at the bottom side of the stopper 5. In this embodiment, elastic backing plate 22 can make stopper 5 pour layer 3 soft contact with the secondary as the cushion layer, helps avoiding stopper 5 and secondary when receiving vibrations pour layer 3 direct collision, has prolonged stopper 5's life. The resilient pad 22 may be a foam, rubber, or polyurethane material, among others.

Further, as shown in fig. 5, the middle of the prefabricated track plate 4 is provided with a lightening hole 26 penetrating through the prefabricated track plate 4, and the top of the lightening hole 26 extends outwards to form a second mounting groove 25 for mounting a lightening member.

In this embodiment, as will be appreciated by those skilled in the art, the prefabricated track slab 4 needs to be hoisted, roughly adjusted and finely adjusted to be fixed above the foundation backfill layer 1. The weight reducing opening 26 is arranged in the middle of the prefabricated track slab 4, so that the weight of the prefabricated track slab can be reduced, the hoisting and the position adjustment are convenient, and the construction is facilitated. Alternatively, the substrate backfill layer 1 will typically have longitudinally extending gutters 7 disposed therein, and the lightening openings 26 may serve as inspection windows for the gutters 7 for inspection of the gutters 7 by maintenance personnel. Preferably, the weight-reducing openings 26 are in the shape of rounded rectangles.

In addition, the size of the top of the lightening opening 26 is larger than that of the bottom, so that the whole inside of the lightening opening 26 has a step structure. In some road sections requiring vibration reduction, a weight member may be installed on the top of the weight-reducing opening 26 to increase the weight of the prefabricated track slab 4, thereby improving the shock resistance of the prefabricated track slab 4. And the weighting piece is detachably arranged in the second mounting groove 25, so that weighting pieces with different masses can be additionally arranged in the weighting port 26, the vibration participating mass of the prefabricated track slab 4 can be changed, and the vibration damping performance can be adjusted, so that the prefabricated track slabs with uniform specifications can be adopted in the common road section and the vibration damping road section, and the application range is wider. The weight may be a slab of concrete, a block of stone or other structure that may be weighted. Of course, as shown in fig. 7, the top of the lightening opening 26 may also be fitted with a grille cover plate 19 as is common in the art.

In addition, the weight member may be detachably coupled with the second mounting groove 25 through various detachable structures. For example, a plurality of protrusions are provided on the bottom wall of the second mounting groove 25, and a plurality of grooves are provided on the bottom side of the extension plate 14, each protrusion being inserted into a corresponding one of the grooves. For another example, the bottom wall of the second mounting groove 25 is provided with a plurality of vertical holes, the extension plate 14 is provided with a plurality of through holes extending vertically, each vertical hole corresponds to one through hole, and a pin is inserted into each vertical hole and the corresponding through hole.

Further, as shown in fig. 6, the weight includes a weight 13 and an extension plate 14 formed by extending a top portion of the weight 13 circumferentially outward. When the weight member is matched with the second mounting groove 25, the weight 13 is positioned in the weight-reducing port 26, and the extension plate 14 is positioned in the second mounting groove 25.

In this embodiment, the weight-increasing member may increase the weight of the prefabricated track slab 4, so that the vibration frequency of the prefabricated track slab 4 may be increased, and the prefabricated track slab 4 may be more stable and may be suitable for a road section requiring vibration reduction. And the weighting piece is installed after the prefabricated track plate 4 is installed and fixed, the mass of the prefabricated track plate 4 is still small, the hoisting and the position adjustment of the prefabricated track plate 4 cannot be influenced, and the construction is convenient. And moreover, the weighting pieces with different masses can be replaced at any time according to actual needs so as to adjust the total weight of the prefabricated track slab 4 (namely, the vibration participating mass can be adjusted), thereby expanding the application range of the track structure. In addition, no matter in the vibration reduction section or the common section, the prefabricated track slabs 4 with uniform specifications can be adopted, so that the construction is more convenient. The weighting element is preferably a reinforced concrete structure. Of course, in a common section, no weighting member may be added.

Further, as shown in fig. 6, the bottom wall of the second mounting groove 25 is connected to the extension plate 14 by a third bolt 23 extending vertically.

In this embodiment, the weight piece is detachably connected with the second mounting groove 25 through the third bolt 23, so that the weight piece is difficult to move, and the weight piece is prevented from impacting the prefabricated track slab 4.

Preferably, a third sleeve 24 extending vertically is embedded at the bottom of the second mounting groove 25, and a third bolt 23 penetrates through the extension plate 14 and is in threaded connection with the third sleeve 24; the top side of the extension plate 14 is provided with a mounting groove for receiving the head of the third sleeve 24, and the mounting groove is provided therein with a sealing cap 12 to seal the head of the third sleeve 24; and a pad (e.g., a foam pad, a rubber pad, etc.) having elasticity may be provided on the bottom side of the extension plate 14 (i.e., between the bottom wall of the second mounting groove 25 and the extension plate 14). The weight member is elastically contacted with the prefabricated track slab 4 (i.e., the bottom wall of the second installation groove 25) to form an elastic system, which can absorb the energy of the vibration of the prefabricated track slab 4 and change the natural vibration frequency of the prefabricated track slab 4.

Further, as shown in fig. 2, a first elastic cushion layer 6 is disposed between the concrete adjusting layer 2 and the base backfill layer 1.

In this embodiment, the first elastic cushion layer 6 is used as a buffer layer between the concrete adjustment layer 2 and the foundation backfill layer 1, so as to improve the shock resistance of the track structure. The first elastic pad 6 may be made of a rubber layer material or a polyurethane material, etc. Of course, instead of the first elastic cushion layer 6, an isolation layer such as geomembrane or geotextile may be disposed between the concrete adjustment layer 2 and the foundation backfill layer 1.

Furthermore, a connecting piece is arranged in the prefabricated track plate 4, and the connecting piece extends out of the bottom side of the prefabricated track plate 4 and is poured into a whole with the concrete adjusting layer 2.

In this embodiment, the prefabricated track slab 4 and the concrete adjustment layer 2 are poured together, so that the weight of the prefabricated track slab 4 can be increased, and the shock resistance of the prefabricated track slab 4 can be improved.

Further, as shown in fig. 1 and 8, the number of the prefabricated track slabs 4 is plural, and the plurality of prefabricated track slabs 4 are sequentially laid in the longitudinal direction. The both ends of prefabricated track board 4 all are equipped with the vertical breach 15 that runs through prefabricated track board 4, are equipped with the connecting device who connects two prefabricated track boards 4 in two adjacent breachs 15.

In this embodiment, the prefabricated track slabs 4 are connected together by the connection means so that all the prefabricated track slabs 4 are integrated, which helps to enhance the stability of the prefabricated track slabs 4. And the gap 15 can reduce the weight of the prefabricated track slab 4, and is helpful for hoisting the prefabricated track slab 4 and adjusting the position of the prefabricated track slab 4.

The connecting means may be a structure capable of connecting two prefabricated rail plates 4. For example, the connecting means comprises a plurality of pieces of rebar; some of the steel bar pieces are buried in the prefabricated track plates 4 respectively and extend out of the inner sides of the gaps 15, and other steel bar pieces are connected with the steel bar pieces buried in the two prefabricated track plates 4 respectively, so that the two prefabricated track plates 4 are connected into a whole. For another example, the connecting means includes a steel plate 17, a plurality of second sleeves 16, and a plurality of second bolts 18; the second sleeve 16 is embedded in the prefabricated track plate 4, the steel plate 17 is attached to the inner sides of two adjacent notches 15, a plurality of second bolts 18 are arranged on the steel plate 17 in a penetrating mode, and the second bolts 18 are in threaded connection with the second sleeve 16 so as to fix the steel plate 17 on the inner sides of the notches 15; a cushion layer having elasticity, such as a rubber cushion layer or a polyurethane cushion layer, may be disposed between the steel plate 17 and the inner wall of the notch 15.

Further, as shown in fig. 1, a second elastic cushion layer 8 is arranged between the prefabricated track slab 4 and the secondary pouring layer 3 and between the limiting block 5 and the secondary pouring layer 3.

In this embodiment, between prefabricated track board 4 and the secondary layer of pouring 3 to and stopper 5 and the secondary layer of pouring 3 between be elastic contact, help promoting prefabricated track board 4's anti-seismic performance and life. The second elastic cushion layer 8 may be a rubber material or a polyurethane material.

On the other hand, the utility model also provides a prefabricated track plate structure, this prefabricated track plate structure includes prefabricated track board 4, and the middle part of prefabricated track board 4 is equipped with the heavy mouthful 26 that subtracts that runs through prefabricated track board, subtracts the top of heavy mouthful 26 and outwards extends in order to form second mounting groove 25, and detachable installs in the second mounting groove 25 and adds heavy piece. The weight reducing port 26 can reduce the weight of the prefabricated track slab 4, and is convenient to construct; and in addition, the weighting pieces with different masses are added in the 26 lightening openings, so that the vibration participating mass of the prefabricated track slab 4 can be changed, and the vibration damping performance can be adjusted, therefore, the prefabricated track slabs with uniform specifications can be adopted in the common road section and the vibration damping road section, and the application range is wider.

The following describes a process of constructing a track structure in conjunction with the embodiments shown in fig. 1 to 8.

Firstly, prefabricating the prefabricated track plate 4, the limiting block 5 and the weight reducing piece. Note that, the precast track slab 4 is provided with a grouting hole 20, a weight-reducing opening 26 and a gap 15; and according to actual need, pre-buried a plurality of first sleeves 9 in the both ends of every lateral part of prefabricated track board 4, pre-buried a plurality of second sleeves 16 that are level with the inside wall of breach 15 in prefabricated track board 4. And reinforcing steel bar structures can be embedded around the first sleeve 9 and the second sleeve 16 to enhance the strength of concrete around the first sleeve 9 and the second sleeve 16.

And secondly, pouring the substrate backfill layer 1. And excavating the tunnel, and pouring a reinforced concrete structure at the bottom of the tunnel to form a substrate backfill layer 1. Connecting steel bars are reserved on two sides of the top of the base backfill layer 1 so as to conveniently build the secondary pouring layer 3. In addition, a drain 7 extending longitudinally needs to be provided in the direction along the center line of the rail. And at intervals, the substrate backfill layer 1 is provided with transversely extending expansion joints.

And thirdly, laying a first elastic cushion layer 6 or an isolation layer. On the top side of the base backfill layer 1 (without gutters 7 and distribution of tie bars) a first elastic cushion 6 or spacer layer is laid.

And fourthly, mounting the prefabricated track plate 4. A mesh of steel reinforcement is laid over the isolation layer or first elastic cushion 66. The rail and clip assembly is mounted to the rail support platform 21 of the prefabricated panel. The prefabricated track plate 4 is arranged above the reinforcing mesh, and after the processes of roughly adjusting the position, finely adjusting the position and the like, the prefabricated track plate 4 is positioned through a common supporting device in the field.

And fifthly, pouring the concrete adjusting layer 2. Pouring self-compacting concrete to the steel bar net sheet through the grouting holes 20 on the precast slabs to form a concrete adjusting layer 2; the casting can be observed through the lightening opening 26 during casting. Of course, the concrete can be prevented from flowing into the drainage ditch 7 by means commonly used in the field, and the utility model is not described herein again.

And sixthly, mounting a limiting block 5. The limit block 5 is mounted to the prefabricated track slab 4 by a first bolt 10, and a sealing cover 12 is mounted in the first mounting groove 11. And an elastic cushion layer (such as a foam cushion layer, a rubber cushion layer and the like) can be arranged between the limiting block 5 and the prefabricated track plate 4, and an elastic cushion plate 22 is arranged at the bottom side of the limiting block 5.

And seventhly, pouring the secondary pouring layer 3. And (3) pouring concrete on two sides of the prefabricated track slab 4, wherein the concrete is poured together with the connecting steel bars on two sides of the top of the base backfill layer 1 to form a secondary pouring layer 3. Expansion joints can also be arranged on the secondary pouring layer 3.

Eighth, the grille cover 19 or the weight is installed, and the connecting means is installed. According to actual needs, the grid cover plate 19 or the weighting block 13 is installed on the weight-reducing port 26. And a connecting device is additionally arranged at the notch 15 of the prefabricated track plate 4 so as to connect the adjacent prefabricated track plates 4. For example, the connecting plate is fixed at the inner side walls of the two notches 15 by the cooperation of the second bolt 18 and the second sleeve 16 at the notch 15 to connect the two prefabricated track slabs 4 together.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. The prefabricated track plate structure is characterized by comprising a prefabricated track plate (4), wherein a weight reducing opening (26) penetrating through the prefabricated track plate (4) is formed in the middle of the prefabricated track plate (4), the top of the weight reducing opening (26) extends outwards to form a second installation groove (25), and a weight increasing piece is detachably installed in the second installation groove (25).

2. Prefabricated track plate structure according to claim 1, characterized in that the weight element comprises a weight element (13) and an extension plate (14) formed by a top portion of the weight element (13) extending circumferentially outwards; when the weight piece is matched with the second installation groove (25), the weight piece (13) is positioned in the weight reducing port (26), and the extension plate (14) is positioned in the second installation groove (25).

3. Prefabricated track plate structure according to claim 2, characterized in that a resilient backing plate is provided between the bottom wall of the second mounting groove (25) and the extension plate (14).

4. Prefabricated track plate structure according to claim 2, characterised in that the bottom wall of the second mounting groove (25) is connected with the extension plate (14) by means of a vertically extending third bolt (23).

5. The prefabricated track plate structure of claim 1, characterized in that, in the direction of the length of the prefabricated track plate (4), both ends of the prefabricated track plate (4) are provided with a notch (15) vertically penetrating the prefabricated track plate (4).

6. Prefabricated track plate structure according to claim 1, characterised in that both side parts of the prefabricated track plate (4) are provided with stop blocks (5) in the direction of the width of the prefabricated track plate (4).

7. The prefabricated track plate structure as claimed in claim 6, wherein a first sleeve (9) is embedded in each of two sides of the prefabricated track plate (4), a first bolt (10) is inserted into the limiting block (5), and a threaded end of the first bolt (10) is in threaded connection with the first sleeve (9) so that the limiting block (5) is installed on the side of the prefabricated track plate (4).

8. Prefabricated track plate structure according to claim 7, characterized in that the side of the stop block (5) facing away from the prefabricated track plate (4) is provided with a first mounting groove (11), the head of the first bolt (10) is pressed against the bottom wall of the first mounting groove (11), and a sealing cover (12) is provided in the first mounting groove (11) to seal the head of the first bolt (10).

9. The prefabricated track plate structure of claim 7, wherein an elastic cushion layer is arranged between the limiting block (5) and the prefabricated track plate (4).

10. Prefabricated track plate structure according to claim 6, characterised in that the bottom side of the stop blocks (5) is provided with an elastic backing plate (22).

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