Roadbed double-block type ballastless track structure

Abstract

The utility model belongs to the technical field of ballastless tracks, and particularly relates to a roadbed double-block type ballastless track structure. Comprising a steel rail, a fastener, a double-block sleeper, a roadbed slab and a base plate, the base plate is divided into a plurality of base units, each base unit is provided with integer roadbed slabs, and expansion joints are reserved between the base units; closed-cell polyethylene plastic foam board caulking is arranged in the expansion joint, and caulking material sealing layers are arranged on the top face and the two sides of the expansion joint. A dowel bar is arranged at the expansion joint between the adjacent base units, the dowel bar is divided into a fixed section and a sliding section, the fixed section is fixedly connected with the base unit on one side of the expansion joint, and the sliding section can be inserted into a guide hole of the base unit on the other side of the expansion joint in a sliding mode; the roadbed double-block type ballastless track structure is simple in structural form and clear in stress, the independent base unit and the roadbed slab structure are arranged in the longitudinal direction of the roadbed, and deformation, cracking and damage of the roadbed slab caused by differential settlement of the roadbed can be effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of ballastless track, and in particular relates to a roadbed double-block ballastless track structure. Background Art

[0002] With the vigorous development of my country's railway construction, double-block ballastless track has been widely promoted and used due to its simple structure, good integrity, convenient construction, and high linear accuracy. At present, the design of long roadbeds with a length greater than 150m adopts a longitudinal ballastless track structure, and the design of short roadbeds less than or equal to 150m adopts a unit ballastless track structure. However, the longitudinal ballastless track is relatively greatly affected by temperature, and the continuous roadbed is prone to cracks, and the disease occurs more frequently and is not easy to replace; the unit ballastless track roadbed and the base are connected by steel bars, which are not stable and prone to longitudinal displacement. This adds a lot of workload to the operation and maintenance of the ballastless track, and it is difficult to ensure the design service life of the ballastless track structure, and sometimes even affects the normal operation of railway trains.

[0003] Therefore, reducing the deformation and cracking of the ballastless track structure in the roadbed section and the workload of operation and maintenance, and ensuring the normal use of the ballastless track and the normal operation of the trains is an urgent problem that the majority of railway builders need to solve. Utility Model Content

[0004] The utility model is designed to solve the problem of deformation, cracking and damage of the roadbed plate caused by uneven settlement of the roadbed.

[0005] The utility model provides the following technical solutions: a roadbed double-block ballastless track structure, comprising rails, fasteners, double-block sleepers, a ballast plate and a base plate;

[0006] The base plate is divided into several base units, each base unit is provided with an integer number of ballast plates, and expansion joints are reserved between the base units; closed-cell polyethylene plastic foam boards are provided in the expansion joints to fill the joints, and a sealing layer of caulking material is provided on the top surface and both sides of the expansion joints; force transfer rods are provided at the expansion joints between adjacent base units, the force transfer rods are smooth straight rods, the force transfer rods are parallel to the length direction of the base plate, and the force transfer rods are divided into a fixed section and a sliding section, the fixed section is fixedly connected to the base unit on one side of the expansion joint, and the sliding section can be slidably inserted into the guide hole of the base unit on the other side of the expansion joint.

[0007] Furthermore, the force transmission rod is arranged in the middle of the cross section of the base unit, the fixed section and the sliding section of the force transmission rod are of equal length, and the fixed section and the sliding section of the force transmission rod on the same base unit are arranged alternately one by one.

[0008] Furthermore, the fixed section of the force transmission rod is connected to the concrete casting of the base unit, the sliding section of the force transmission rod is coated with grease, and the sliding section of the force transmission rod is provided with a polyethylene material heat-sealed condensation plastic sealing structure; a metal sleeve with a bottom is nested at the bottom of the guide hole of the base unit, and a buffer filler is provided at the bottom of the metal sleeve; the end of the sliding section of the force transmission rod extends into the metal sleeve.

[0009] Furthermore, the bottom surface of the track bed plate is provided with two limiting bosses protruding toward the base unit, and the limiting bosses are distributed along the length direction of the track bed plate. The top surface of the base unit is provided with two limiting grooves corresponding to each track bed plate. The limiting bosses are in the shape of a quadrangular pyramid in the height direction, and the limiting grooves are consistent with the limiting bosses. An isolation layer is provided between the bottom surface of the track bed plate and the top surface of the base unit, and an elastic cushion layer is laid on the side of the limiting groove.

[0010] Furthermore, a water collection well is arranged between the lines of the double-block ballastless track structure of the roadbed, and a transverse drainage slope is arranged on the top surface of the roadbed slab in the straight section.

[0011] Furthermore, the width of the expansion joint between the base units is 20 mm, the length of the dowel rod is 700 mm, the diameter of the dowel rod is 32 mm, and the lateral spacing of the dowel rods is 300 mm.

[0012] Furthermore, three or four track bed plates are arranged on each base unit.

[0013] Compared with the prior art, the advantages of the present invention are:

[0014] The utility model provides a double-block ballastless track structure with a simple structure and clear force. Independent base units and roadbed plate structures are arranged along the longitudinal direction of the roadbed, which can effectively avoid deformation, cracking and damage of the roadbed plate caused by uneven settlement of the roadbed, thereby increasing the service life of the ballastless track structure, reducing the workload of railway operation and maintenance, and ensuring the normal operation of railway trains. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the cross-section diagram of the double-block ballastless track on the roadbed;

[0016] Figure 2 This is the plan layout of the double-block ballastless track on the roadbed;

[0017] Figure 3 This is the longitudinal section of the double-block ballastless track on the roadbed;

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] In the figure: 1-rail; 2-water collection well; 3-double-block sleeper; 4-ballast plate; 5-base unit; 6-expansion joint; 7-closed-cell polyethylene plastic foam board; 8-sealing layer of caulking material; 9-force transfer rod; 9.1-fixed section; 9.2-sliding section; 10-metal sleeve; 11-limiting boss; 12-limiting groove. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] like Figure 1 , Figure 2 Shown is a roadbed double-block ballastless track structure, comprising rails 1, fasteners, double-block sleepers 3, a ballast plate 4 and a base plate.

[0022] The base plate is divided into a number of base units 5, each of which is provided with an integer number of ballast plates 4, and expansion joints 6 are reserved between the base units 5, which serve as deformation spaces when the base units 5 expand and contract due to heat; closed-cell polyethylene plastic foam boards 7 are provided in the expansion joints 6 for filling, and sealing layers 8 of caulking materials are provided on the top surface and both sides of the expansion joints 6; force transmission rods 9 are provided at the expansion joints 6 between adjacent base units 5, and the force transmission rods 9 are smooth straight rods, which are parallel to the length direction of the base plate, and serve as guiding structures when the base units 5 expand and contract due to heat, and the force transmission rods 9 are divided into fixed sections 9.1 and sliding sections 9.2, the fixed sections 9.1 are fixedly connected to the base unit 5 on one side of the expansion joint 6, and the sliding sections 9.2 can be slidably inserted into the guide holes of the base unit 5 on the other side of the expansion joint 6.

[0023] The roadbed slab 4 is cast in blocks on site. The length of the block roadbed slab is generally 5 to 7 m. Three or four roadbed slabs 4 are arranged on each base unit 5 .

[0024] like Figure 3 , Figure 4 As shown: the surface of the force transmission rod 9 is treated with phosphate and zinc oxide plating for rust prevention; the force transmission rod 9 is arranged in the middle of the cross section of the base unit 5, the fixed section 9.1 and the sliding section 9.2 of the force transmission rod 9 are of equal length, and the fixed section 9.1 and the sliding section 9.2 of the force transmission rod 9 on the same base unit 5 are arranged alternately one by one.

[0025] The fixed section 9.1 of the force transmission rod 9 is connected to the concrete casting of the base unit 5, the sliding section 9.2 of the force transmission rod 9 is coated with grease, and the sliding section 9.2 of the force transmission rod 9 is provided with a polyethylene material heat-sealed condensation plastic sealing structure; a metal sleeve 10 with a bottom is nested at the bottom of the guide hole of the base unit 5, the metal sleeve 10 is a 100mm long stainless steel sleeve, and a buffer filler is provided at the bottom of the metal sleeve 10, and the buffer filler is foam plastic; the end of the sliding section 9.2 of the force transmission rod 9 extends into the metal sleeve 10.

[0026] The width of the expansion joint 6 between the base units 5 is 20 mm, the length of the force transfer rod 9 is 700 mm, the force transfer rod 9 adopts Φ32 mm smooth steel bars, and the lateral spacing of the force transfer rods 9 is 300 mm.

[0027] The roadbed plate 4 and the base unit 5 can also be relatively displaced, that is, the roadbed plate 4 will not be deformed, cracked, damaged, etc. even if it is subjected to thermal expansion and contraction. The bottom surface of the roadbed plate 4 is provided with two limit bosses 11 protruding toward the base unit 5. The limit bosses 11 are distributed along the length direction of the roadbed plate 4. The top surface of the base unit 5 is provided with two limit grooves 12 corresponding to each roadbed plate 4. The limit bosses 11 are in the shape of a quadrangular pyramid in the height direction. The limit grooves 12 are consistent with the limit bosses 11. The limit bosses 11 cooperate with the limit grooves 12 to stabilize the position of the roadbed plate 4 on the base unit 5. An isolation layer is provided between the bottom surface of the roadbed plate 4 and the top surface of the base unit 5. The isolation layer is a 4mm thick polypropylene non-woven geotextile. The side of the limit groove 12 is paved with an elastic cushion layer. When the concrete strength of the base unit 5 reaches 75% of the design strength, an isolation layer and an elastic cushion layer are laid; the isolation layer and the elastic cushion layer enable slight displacement between the track bed slab 4 and the base unit 5 .

[0028] The longitudinal and transverse reinforcements of the base unit 5 are made of steel mesh processed in the factory. The vertical reinforcements, U-shaped reinforcements, connecting reinforcements, etc. are processed centrally by the reinforcement processing plant and transported to the construction site for standby use. Before installing the reinforcements of the base unit 5, the protective layer pads are placed in a plum blossom shape according to the requirement of no less than 4 per square meter. In order to prevent the corners of the limit groove 12 from being chipped and falling off during demolding and to reduce the cracking of the concrete at the four corners of the limit groove 12 due to stress concentration, the four corners of the limit groove 12 are reinforced with anti-cracking steel wire mesh.

[0029] The double-block ballastless track structure of the roadbed is provided with a water collection well 2 between the lines, and a transverse drainage slope is provided on the top surface of the roadbed slab 4 in the straight section to prevent water accumulation on the surface of the roadbed slab 4.

[0030] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A roadbed double-block ballastless track structure, comprising a rail (1), a fastener, a double-block sleeper (3), a ballast plate (4) and a base plate; Features: The base plate is divided into a plurality of base units (5), each base unit (5) is provided with an integral number of ballast plates (4), and expansion joints (6) are reserved between the base units (5); a closed-cell polyethylene plastic foam board (7) is provided in the expansion joint (6) to fill the joint, and a sealing layer (8) of caulking material is provided on the top surface and both sides of the expansion joint (6); a force transmission rod (9) is provided at the expansion joint (6) between adjacent base units (5), the force transmission rod (9) is a smooth straight rod, the force transmission rod (9) is parallel to the length direction of the base plate, and the force transmission rod (9) is divided into a fixed section (9.1) and a sliding section (9.2), the fixed section (9.1) is fixedly connected to the base unit (5) on one side of the expansion joint (6), and the sliding section (9.2) can be slidably inserted into the guide hole of the base unit (5) on the other side of the expansion joint (6).

2. The double-block ballastless track structure for roadbed according to claim 1, characterized in that: The force transmission rod (9) is arranged in the middle of the cross section of the base unit (5); the fixed section (9.1) and the sliding section (9.2) of the force transmission rod (9) are of equal length; the fixed section (9.1) and the sliding section (9.2) of the force transmission rod (9) on the same base unit (5) are arranged alternately.

3. The double-block ballastless track structure for roadbed according to claim 2, characterized in that: The fixed section (9.1) of the force transmission rod (9) is connected to the concrete pouring of the base unit (5), the sliding section (9.2) of the force transmission rod (9) is coated with grease, and the sliding section (9.2) of the force transmission rod (9) is provided with a polyethylene material heat-sealed condensation plastic sealing structure; a metal sleeve (10) with a bottom is embedded at the bottom of the guide hole of the base unit (5), and a buffer filler is provided at the bottom of the metal sleeve (10); the end of the sliding section (9.2) of the force transmission rod (9) extends into the metal sleeve (10).

4. A roadbed double-block ballastless track structure according to any one of claims 1 to 3, characterized in that: The bottom surface of the ballast plate (4) is provided with two limiting bosses (11) protruding toward the base unit (5), and the limiting bosses (11) are distributed along the length direction of the ballast plate (4). The top surface of the base unit (5) is provided with two limiting grooves (12) corresponding to each ballast plate (4), and the limiting bosses (11) are in the shape of a quadrangular pyramid in the height direction, and the limiting grooves (12) are consistent with the limiting bosses (11). An isolation layer is provided between the bottom surface of the ballast plate (4) and the top surface of the base unit (5), and an elastic cushion layer is laid on the side of the limiting grooves (12).

5. A roadbed double-block ballastless track structure according to claim 4, characterized in that: The roadbed double-block ballastless track structure is provided with a water collection well (2) between the lines, and a transverse drainage slope is provided on the top surface of the roadbed plate (4) in the straight section.

6. The double-block ballastless track structure for roadbed according to claim 2, characterized in that: The width of the expansion joint (6) between the base units (5) is 20 mm, the length of the force transmission rod (9) is 700 mm, the diameter of the force transmission rod (9) is 32 mm, and the lateral spacing of the force transmission rod (9) is 300 mm.

7. The double-block ballastless track structure for roadbed according to claim 1, characterized in that: Three or four track bed plates (4) are arranged on each base unit (5).

Images