Fabricated CRTS III slab track structure and construction method

Abstract

The application discloses an assembled CRTS III slab-type ballastless track structure and a construction method, and relates to the field of track structures.The assembled CRTS III slab-type ballastless track structure comprises a roadbed layer, a base plate, a damping layer, a track plate and a steel rail, the roadbed layer is a prefabricated concrete structure, and a positioning piece is embedded in the roadbed layer, the positioning piece is composed of a positioning seat and a positioning column, a primary pin shaft hole is formed in the positioning column, the base plate is installed on the upper surface of the roadbed layer, the damping layer is laid on the upper surface of the base plate, the track plate is laid on the upper surface of the damping layer, and the steel rail is positioned and installed on the track plate through a steel rail fastener; the assembled CRTS III slab-type ballastless track structure composed of the roadbed layer, the base plate, the damping layer, the track plate and the steel rail is arranged, so that the components of the track structure can be prefabricated in a factory, and then combined and assembled on site, and the on-site construction efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of track construction, in particular to a prefabricated CRTS III slab-type ballastless track structure and a construction method. BACKGROUND

[0002] The CRTS III slab-type ballastless track structure is widely used in passenger high-speed railway engineering. The traditional CRTS III slab-type ballastless track structure can only be constructed after the deformation of the subgrade settlement is stable. The settlement evaluation period cannot be effectively utilized. The construction process of the reinforced concrete base adopts cast-in-place base plate and site pouring of self-compacting concrete. The construction quality and structure size correction of the concrete are difficult to control. The external formwork is erected, the embedded parts and reserved holes are set, and the fixing during the vibrating process also causes construction efficiency reduction due to the complex process operation. After the base plate concrete is completed, the maintenance period is long, and rapid sequence and continuous construction cannot be carried out. SUMMARY

[0003] The present application aims to provide a prefabricated CRTS III slab-type ballastless track structure and a construction method to solve the problems in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a prefabricated CRTS III slab-type ballastless track structure, comprising:

[0005] A subgrade layer, which is a prefabricated concrete structure, and a positioning part is embedded in the subgrade layer, the positioning part is composed of a positioning seat and a positioning column, and a primary pin shaft hole is formed in the positioning column;

[0006] A base plate, which is installed on the upper surface of the subgrade layer;

[0007] A shock absorption layer, which is laid on the upper surface of the base plate;

[0008] A track slab, which is laid on the upper surface of the shock absorption layer;

[0009] A rail, which is positioned and installed on the track slab by a rail fastener.

[0010] Preferably, the positioning seat is completely poured in the subgrade layer, and the positioning seat is in a stepped seat structure. The positioning column is exposed outside the subgrade layer, and the surface of the subgrade layer is coated with an asphalt concrete sealing waterproof layer.

[0011] Preferably, a second pin hole and a first positioning hole are arranged on the base plate, the first positioning hole is arranged corresponding to the positioning column, and the positioning column is embedded in the first positioning hole during actual installation; the second pin hole is arranged corresponding to the first pin hole, and the second pin hole is arranged in communication with the first positioning hole; and the base plate and the positioning column are positioned by the pin.

[0012] Preferably, a rectangular groove is arranged at the end of the second pin hole, the second pin hole does not penetrate the base plate, and a through hole is arranged at the bottom of the second pin hole; a limiting piece is welded in the rectangular groove; and the pin is limited by the limiting piece.

[0013] Preferably, a third pin hole is arranged on the limiting piece, the third pin hole is arranged corresponding to the second pin hole, an annular groove is arranged at the inner side of the third pin hole, guide grooves and limiting grooves are arranged on the side wall of the third pin hole, the guide grooves and the limiting grooves are symmetrically arranged in one group, the cross-sectional dimensions of the guide grooves and the limiting grooves are matched, and the guide grooves and the limiting grooves are arranged in a cross shape.

[0014] Preferably, the pin is composed of a pin rod, a supporting spring and a top head, the two ends of the supporting spring are connected with the pin rod and the top head respectively, a limiting block is integrally formed on the side wall of the pin rod, the limiting blocks are symmetrically arranged in one group, the dimensions of the limiting blocks are matched with the dimensions of the limiting grooves, and the supporting spring is in a compressed state when the limiting blocks are embedded in the limiting grooves.

[0015] Preferably, an inner hexagonal notch is arranged at the end of the pin rod, and a mark groove is arranged on the end face of the pin rod, the mark grooves are symmetrically arranged in one group, and the arrangement direction of the mark grooves is the same as that of the limiting blocks.

[0016] Preferably, a threaded seat is welded on the upper surface of the base plate, a threaded hole is arranged on the threaded seat, an installation hole is arranged on the track plate, an installation groove and a positioning groove are arranged at the upper and lower side of the installation hole respectively, the positioning groove is arranged corresponding to the threaded seat, the threaded seat is embedded in the positioning groove during actual installation of the track plate, and the track plate is positioned by the fastening bolt.

[0017] Preferably, the lower surface of the bolt head of the fastening bolt is provided with a meshing tooth groove, the mounting groove is a slot structure with a regular hexagonal cross section, and a limiting component is installed in the mounting groove. The limiting component is composed of an elastic rubber plate, a movable seat and meshing teeth. The meshing tooth groove and the meshing teeth are evenly arranged in a circle. The meshing tooth groove is a slot structure with an isosceles triangular cross section, and the meshing teeth are a protrusion structure with an isosceles triangular cross section. The meshing tooth groove and the meshing teeth are correspondingly arranged, and when the fastening bolt is actually tightened, its meshing teeth are embedded in the meshing tooth groove.

[0018] A construction method for a prefabricated CRTSⅢ slab track structure includes the following steps:

[0019] Step 1: The road base layer laying process involves transporting the prefabricated road base layer slabs to the designated location and then laying them.

[0020] Step 2: The process of laying the base plate involves laying the base plate on the road base layer and positioning it using pins.

[0021] Step 3: The process of laying the damping layer;

[0022] Step 4: The installation process of the track slabs and rails, and after the laying is completed, the overall structure is inspected and accepted.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. By setting up a prefabricated CRTSⅢ slab track structure composed of road base, base plate, shock absorption layer, track slab and rail, the various components of the track structure can be prefabricated in the factory and then assembled on site, which greatly improves the efficiency of on-site construction.

[0025] 2. A rectangular groove is opened at the end of the secondary pin hole on the base plate, and a limiting component is welded into the rectangular groove. A tertiary pin hole, an annular groove, a guide groove, and a limiting groove are opened on the limiting component. The pin is configured to be composed of a pin rod, a support spring, and a top head. A limiting block is set on the side wall of the pin rod, so that the limiting block is embedded into the limiting groove, thereby improving the overall positioning stability of the pin. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a half-sectional view of the track slab of the present invention;

[0028] Figure 3This is a half-sectional view of the base plate of the present invention;

[0029] Figure 4 This is a schematic diagram of the positioning component structure of the present invention;

[0030] Figure 5 This is a half-sectional view of the limiting component of the present invention;

[0031] Figure 6 This is a schematic diagram of the pin structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the fastening bolt structure of the present invention.

[0033] In the diagram: 1. Road base layer; 2. Base plate; 3. Vibration damping layer; 4. Track slab; 5. Rail; 7. Positioning seat; 8. Positioning post; 9. Primary pin hole; 10. Secondary pin hole; 11. Primary positioning hole; 12. Threaded seat; 13. Pin; 14. Mounting hole; 15. Fastening bolt; 16. Rectangular groove; 17. Through hole; 18. Limiting component; 19. Tertiary pin hole; 20. Annular groove; 21. Guide groove; 22. Limiting groove; 23. Pin rod; 24. Support spring; 25. Top head; 26. Limiting block; 27. Hexagonal socket; 28. Marking groove; 29. ​​Meshing tooth groove; 30. Positioning groove; 31. Mounting groove; 32. Elastic rubber plate; 33. Movable seat; 34. Meshing teeth. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit the embodiments of the present invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0037] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0038] Please see Figures 1-7 The present invention provides the following four preferred embodiments.

[0039] Example 1

[0040] A prefabricated CRTSⅢ slab track structure includes a road base 1, a base plate 2, a damping layer 3, a track slab 4, and rails 5. The road base 1 is a precast concrete structure, and positioning components are embedded in the road base 1. The positioning components are composed of positioning seats 7 and positioning posts 8, and the positioning posts 8 have primary pin holes 9. The base plate 2 is installed on the upper surface of the road base 1, the damping layer 3 is laid on the upper surface of the base plate 2, the track slab 4 is laid on the upper surface of the damping layer 3, and the rails 5 are positioned and installed on the track slab 4 by rail fasteners. By setting up a prefabricated CRTSⅢ slab track structure composed of road base 1, base plate 2, damping layer 3, track slab 4, and rails 5, the various components of the track structure can be prefabricated in the factory and then assembled on site, thereby greatly improving the on-site construction efficiency.

[0041] The positioning seat 7 is completely cast into the road base 1, and the positioning seat 7 has a stepped seat structure. The positioning column 8 is exposed on the outside of the road base 1, and the surface of the road base 1 is coated with an asphalt concrete sealing waterproof layer.

[0042] Example 2

[0043] Based on Embodiment 1, the base plate 2 is provided with a secondary pin hole 10 and a primary positioning hole 11. The primary positioning hole 11 is correspondingly provided with the positioning post 8. When the base plate 2 is actually installed, its positioning post 8 is embedded in the primary positioning hole 11. The secondary pin hole 10 is correspondingly provided with the primary pin hole 9. The secondary pin hole 10 is connected to the primary positioning hole 11. The base plate 2 and the positioning post 8 are positioned by a pin 13.

[0044] A rectangular groove 16 is provided at the end of the secondary pin hole 10, and the secondary pin hole 10 does not penetrate the base plate 2. A through hole 17 is provided at the bottom of the secondary pin hole 10. A limiting member 18 is welded and installed in the rectangular groove 16, and the pin 13 is limited by the limiting member 18.

[0045] The limiting member 18 has a three-stage pin hole 19, which is corresponding to the two-stage pin hole 10. An annular groove 20 is provided at the inner end of the three-stage pin hole 19. A guide groove 21 and a limiting groove 22 are provided on the side wall of the three-stage pin hole 19. A set of guide grooves 21 and limiting grooves 22 are symmetrically arranged. The cross-sectional dimensions of guide grooves 21 and limiting grooves 22 match, and they are arranged in a cross shape.

[0046] The pin 13 is composed of a pin rod 23, a support spring 24, and a top head 25. Both ends of the support spring 24 are connected to the pin rod 23 and the top head 25, respectively. A limiting block 26 is integrally formed on the side wall of the pin rod 23. A set of limiting blocks 26 are symmetrically arranged, and the size of the limiting block 26 matches the size of the limiting groove 22. When the limiting block 26 is embedded in the limiting groove 22, its support spring 24 is under pressure, passing through the secondary pin hole in the base plate 2. A rectangular groove 16 is provided at the end of the 10, and a limiting member 18 is welded and connected in the rectangular groove 16. A three-stage pin hole 19, an annular groove 20, a guide groove 21 and a limiting groove 22 are provided on the limiting member 18. The pin 13 is configured to be composed of a pin rod 23, a support spring 24 and a top head 25. A limiting block 26 is provided on the side wall of the pin rod 23, so that the limiting block 26 is embedded into the limiting groove 22, thereby improving the overall positioning stability of the pin 13.

[0047] The end of the pin 23 is provided with an internal hexagonal slot 27, and the end face of the pin 23 is provided with a mark groove 28. A set of mark grooves 28 are symmetrically arranged, and the direction of the mark grooves 28 is the same as the direction of the limit block 26, which facilitates the determination of the position of the limit block 26.

[0048] Example 3

[0049] Based on Embodiment 2, a threaded seat 12 is welded to the upper surface of the base plate 2. The threaded seat 12 has a threaded hole. The track plate 4 has a mounting hole 14. The upper and lower ports of the mounting hole 14 are respectively provided with mounting grooves 31 and positioning grooves 30. The positioning grooves 30 are correspondingly provided with the threaded seat 12. When the track plate 4 is actually installed, its threaded seat 12 is embedded in the positioning groove 30, and the track plate 4 is positioned by fastening bolts 15.

[0050] The lower surface of the bolt head of the fastening bolt 15 is provided with a meshing tooth groove 29. The mounting groove 31 is a groove structure with a regular hexagonal cross section, and a limiting component is installed in the mounting groove 31. The limiting component is composed of an elastic rubber plate 32, a movable seat 33, and a meshing tooth 34. The meshing tooth groove 29 and the meshing tooth 34 are evenly arranged in a circle. The meshing tooth groove 29 is a groove structure with an isosceles triangular cross section, and the meshing tooth 34 is a protrusion structure with an isosceles triangular cross section. The meshing tooth groove 29 and the meshing tooth 34 are correspondingly arranged. When the fastening bolt 15 is actually tightened, its meshing tooth 34 is embedded in the meshing tooth groove 29. Through the meshing action of the meshing tooth 34 and the meshing tooth groove 29, the fastening bolt 15 is prevented from loosening, thereby ensuring the fixing stability of the fastening bolt 15.

[0051] Example 4

[0052] Based on Example 3, a construction method for a prefabricated CRTSⅢ slab track structure is provided, which includes the following steps:

[0053] Step 1: The road base layer paving process involves transporting the prefabricated road base layer 1 slabs to the designated location and then laying them.

[0054] Step 2: The process of laying the base plate involves laying the base plate 2 on the road base layer 1 and positioning the base plate 2 using the pin 13.

[0055] Step 3: The process of laying the damping layer;

[0056] Step 4: The installation process of the track slabs and rails, and after the laying is completed, the overall structure is inspected and accepted.

[0057] Although the illustrative specific embodiments of this application have been described above to enable those skilled in the art to understand this application, this application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications utilizing the concept of this application are protected as long as various variations are within the spirit and scope of this application as defined and determined by the appended claims.

Claims

1. A prefabricated CRTSⅢ slab track structure, characterized in that: The assembled CRTSⅢ slab track structure includes: The road base (1) is a precast concrete structure, and a positioning component is embedded in the road base (1). The positioning component is composed of a positioning seat (7) and a positioning column (8), and a primary pin hole (9) is provided on the positioning column (8). Base plate (2), said base plate (2) is installed on the upper surface of the road base layer (1); A shock-absorbing layer (3) is laid on the upper surface of the base plate (2); Track slab (4), which is laid on the upper surface of the damping layer (3); The rail (5) is positioned and installed on the track plate (4) by rail fasteners; The base plate (2) is provided with a secondary pin hole (10) and a primary positioning hole (11). The primary positioning hole (11) is correspondingly set with the positioning post (8). When the base plate (2) is actually installed, its positioning post (8) is embedded in the primary positioning hole (11). The secondary pin hole (10) is correspondingly set with the primary pin hole (9). The secondary pin hole (10) is connected with the primary positioning hole (11). The base plate (2) and the positioning post (8) are positioned by a pin (13). The end of the secondary pin hole (10) is provided with a rectangular groove (16), and the secondary pin hole (10) does not penetrate the base plate (2), and the bottom of the secondary pin hole (10) is provided with a through hole (17). A limiting member (18) is welded and installed in the rectangular groove (16), and the pin (13) is limited by the limiting member (18). The limiting member (18) is provided with a three-stage pin hole (19), which is corresponding to the two-stage pin hole (10). An annular groove (20) is provided at the inner port of the three-stage pin hole (19). A guide groove (21) and a limiting groove (22) are provided on the side wall of the three-stage pin hole (19). A set of guide grooves (21) and limiting grooves (22) are symmetrically arranged. The cross-sectional dimensions of guide grooves (21) and limiting grooves (22) match. The guide grooves (21) and limiting grooves (22) are arranged in a cross shape. The pin (13) is composed of a pin rod (23), a support spring (24) and a top (25). The two ends of the support spring (24) are connected to the pin rod (23) and the top (25) respectively. A limiting block (26) is integrally formed on the side wall of the pin rod (23). A set of limiting blocks (26) are symmetrically arranged. The size of the limiting block (26) matches the size of the limiting groove (22). When the limiting block (26) is embedded in the limiting groove (22), its support spring (24) is under pressure.

2. The prefabricated CRTSⅢ slab track structure according to claim 1, characterized in that: The positioning seat (7) is completely cast into the road base (1), and the positioning seat (7) has a stepped seat structure. The positioning column (8) is exposed on the outside of the road base (1), and the surface of the road base (1) is coated with an asphalt concrete sealing waterproof layer.

3. The prefabricated CRTSⅢ slab track structure according to claim 2, characterized in that: The end of the pin (23) is provided with an internal hexagonal groove (27), and the end face of the pin (23) is provided with a mark groove (28). A set of mark grooves (28) are symmetrically arranged, and the direction of the mark grooves (28) is the same as the direction of the limit block (26).

4. The prefabricated CRTSⅢ slab track structure according to claim 3, characterized in that: The upper surface of the base plate (2) is welded with a threaded seat (12), the threaded seat (12) is provided with a threaded hole, the track plate (4) is provided with an installation hole (14), the upper and lower side ports of the installation hole (14) are respectively provided with an installation groove (31) and a positioning groove (30), the positioning groove (30) is provided correspondingly to the threaded seat (12), and when the track plate (4) is actually installed, its threaded seat (12) is embedded into the positioning groove (30), and the track plate (4) is positioned by fastening bolts (15).

5. The prefabricated CRTSⅢ slab track structure according to claim 4, characterized in that: The bolt head of the fastening bolt (15) has a meshing tooth groove (29) on its lower surface. The mounting groove (31) is a slot structure with a regular hexagonal cross section. A limiting member is installed in the mounting groove (31). The limiting member is composed of an elastic rubber plate (32), a movable seat (33), and a meshing tooth (34). The meshing tooth groove (29) and the meshing tooth (34) are evenly arranged in a circle. The meshing tooth groove (29) is a slot structure with an isosceles triangle cross section. The meshing tooth (34) is a protruding structure with an isosceles triangle cross section. The meshing tooth groove (29) and the meshing tooth (34) are correspondingly arranged. When the fastening bolt (15) is actually tightened, its meshing tooth (34) is embedded in the meshing tooth groove (29).

6. A construction method for a prefabricated CRTSⅢ slab track structure as described in any one of claims 1-5, characterized in that: The construction method for this prefabricated CRTSⅢ slab track structure includes the following steps: Step 1: The process of laying the road base layer involves transporting the prefabricated road base layer (1) slabs to the designated location and then laying them. Step 2: The process of laying the base plate is to lay the base plate (2) on the road base layer (1) and position the base plate (2) by means of the pin (13); Step 3: The process of laying the damping layer; Step 4: The installation process of the track slabs and rails, and after the laying is completed, the overall structure is inspected and accepted.

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