A ballastless track structure and method suitable for micro rail transit ground lines

Abstract

The present application relates to the field of rail transit, and particularly relates to a ballastless track structure and method suitable for micro rail transit ground line, which comprises a base; a ballastless track unit, which comprises a prefabricated sleeper plate arranged on the base, and a reserved groove on the upper part of the prefabricated sleeper plate for placing the bottom structure of a channel steel rail; further comprising two limiting blocks arranged on both sides of the channel steel rail, which laterally wrap the channel steel rail and the prefabricated sleeper plate; a concrete structure cast in situ on the side surface of the limiting blocks and integrally formed with the limiting blocks and the base through steel bars; the limiting blocks and the base are integrally formed through lapping, the channel steel rail and the prefabricated sleeper plate are wrapped therein, the channel steel rail is installed without fasteners, and sufficient stability is provided to ensure driving safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, in particular to a ballastless track structure and method suitable for micro rail transit ground line. BACKGROUND

[0002] Micro rail transit is a new type of rail transit, which is different from subway and light rail, and is a low-traffic rail transit type. It has the advantages of lightweight structure, flexible operation organization, low traffic volume and high frequency, and can fill the gap in low-traffic urban public transportation. Compared with elevated and underground interval laying methods, micro rail transit adopts ground line laying method, which is more economical, safer and more convenient for passengers. Therefore, the selection of track structure form of ground line is particularly important.

[0003] A utility model patent with the application number 201420801090X discloses a split type continuous support fastener-free track bed system, which comprises a concrete track slab and a concrete rail groove. The concrete rail groove is arranged above the concrete track slab. A steel rail, a pad and a high polymer filler are arranged in the concrete rail groove. The pad is arranged at the bottom of the steel rail and is continuously laid under the steel rail and integrally bonded with the concrete rail groove. The high polymer filler is arranged outside the steel rail. The split type continuous support fastener-free track bed system is convenient to maintain and replace, prolongs the service life of the line, and has high laying efficiency due to continuous laying.

[0004] However, since the high polymer filler is arranged outside the steel rail, the high polymer filler has limited limiting effect on the steel rail, which causes poor stability of the steel rail and affects the normal and safe use of the standard rail. Especially in the line with small turning radius, the high polymer filler is subjected to extrusion damage, and even derailment occurs when the damage is severe. SUMMARY

[0005] The present application aims to provide a ballastless track structure and method suitable for micro rail transit ground line to solve the problem of unstable limiting of the steel rail by the high polymer filler. In order to achieve the above-mentioned purpose, the present application solves the problem by the following technical scheme:

[0006] In the first aspect, the present application provides a ballastless track structure suitable for micro rail transit ground line, which comprises:

[0007] a base;

[0008] a ballastless track unit, which comprises a prefabricated sleeper slab arranged on the base, a reserved groove at the upper part of the prefabricated sleeper slab for placing the bottom structure of a channel-shaped steel rail, and two limiting blocks arranged on both sides of the channel-shaped steel rail to laterally wrap the channel-shaped steel rail and the prefabricated sleeper slab;

[0009] A concrete structure is cast in situ on the side of the limiting block and forms an integral structure by lapping with the limiting block and the base through steel bars.

[0010] In a second aspect, the present application provides a ballastless track structure suitable for micro rail transit ground line, comprising:

[0011] The base;

[0012] Two ballastless track units as described in the first aspect are provided with a transverse support beam between them.

[0013] A concrete structure is cast in situ on the side of the limiting block and forms an integral structure by lapping with the limiting block and the base through steel bars.

[0014] As a further technical solution of the first aspect or the second aspect, the groove-shaped rail is covered with an elastic sleeve on the matching surface of the limiting block and the prefabricated sleeper plate.

[0015] As a further technical solution of the first aspect or the second aspect, a cushion layer made of cement asphalt mortar is provided between the prefabricated sleeper plate and the base.

[0016] As a further technical solution of the first aspect or the second aspect, a plurality of limiting grooves are provided on both sides of the prefabricated sleeper plate, and a limiting column matched with the limiting grooves is provided on the base.

[0017] As a further technical solution of the first aspect or the second aspect, the concrete structure is cast in situ by foamed concrete.

[0018] As a further technical solution of the second aspect, the transverse support beams are arranged at intervals along the longitudinal direction of the track.

[0019] As a further technical solution of the second aspect, the inner concrete structure is arranged between the transverse support beam and the base.

[0020] In a third aspect, the present application provides a construction method of the ballastless track structure according to the first aspect, comprising the following steps:

[0021] Excavate a trapezoidal foundation pit for installing the ballastless track structure on the ground embankment, pour a reinforced concrete base, assemble a prefabricated sleeper plate, a groove-shaped rail and a limiting block, pour concrete on both sides of the overall track structure, and lap with the base and the limiting block through reserved steel bars to form a single-track ballastless track structure.

[0022] In a fourth aspect, the present application provides a construction method of the ballastless track structure according to the second aspect, characterized in that it comprises the following steps:

[0023] The trapezoidal foundation pit is excavated in the ground roadbed to install the slab track structure, the reinforced concrete base is poured, the prefabricated sleeper plate is installed, the prefabricated sleeper plate, the channel steel rail and the limiting block are assembled to form two slab track units, the concrete is poured on both sides of the whole track structure, and the concrete is poured, the transverse support beam is placed and the concrete is poured in the two slab track units to form the double-track slab track structure.

[0024] The beneficial effects of the present application are as follows:

[0025] (1) The present application sets up the slab track unit including the prefabricated sleeper plate and two limiting blocks, the concrete is cast on the side of the limiting block, and the steel bars are respectively overlapped with the limiting block and the base to form the whole structure, the channel steel rail and the prefabricated sleeper plate are wrapped inside, the channel steel rail is installed without fasteners, and enough stability is provided to ensure the smoothness and stability of driving.

[0026] (2) The elastic sleeve of the present application is arranged on both sides of the channel steel rail and between the rail and the limiting block, is fixed on the limiting block and provides elastic force for the rail to reduce the influence of vibration and play the role of absorbing noise to achieve the effect of replacing the fastener.

[0027] (3) The present application is provided with the cushion layer made of cement asphalt mortar between the prefabricated sleeper plate and the base, has good bonding performance, serves as elastic adjustment, plays the roles of leveling and buffering for the track structure. In addition, the buffering and vibration reduction of the elastic sleeve, due to the whole limiting effect of the track structure, the channel steel rail and the prefabricated sleeper plate can move within a certain space, but only within the safe and reasonable deformation range provided by the elastic material, good vibration reduction is realized, and the problems of thickness being difficult to control and bonding performance being difficult to guarantee of the interface layer are indirectly overcome.

[0028] (4) The prefabricated sleeper plate is provided with a plurality of limiting grooves on both sides, and the base is provided with limiting piers matched with the limiting grooves. The limiting grooves and the limiting piers on the base limit the longitudinal and transverse displacement of the prefabricated sleeper plate. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the description of the exemplary embodiments of the present application and the explanation thereof, explain the present application. It is to be understood that these drawings are only schematic and are not necessarily drawn to scale. The present application will now be described and explained with additional features and details by the use of the accompanying drawings in which:

[0030] Figure 1 A slab track structure schematic diagram in the first embodiment of the present application is shown;

[0031] Figure 2A schematic diagram of the ballastless track structure in Embodiment 3 of the present invention is shown;

[0032] Figure 3 A top view of the prefabricated sleeper plate structure in an embodiment of the present invention is shown.

[0033] In the diagram: 1. Base; 2. Subbase; 3. Precast sleeper slab; 4. Foamed concrete; 5. Elastic sheath; 6. Limiting block; 7. Groove rail; 8. Asphalt layer; 9. Subgrade; 10. Transverse support beam; 11. Limiting groove; 12. Limiting pier; 13. Longitudinal joint between precast sleeper slabs. Detailed Implementation

[0034] The technical solutions in typical embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0035] Example 1

[0036] like Figure 1 and Figure 3 As shown, this embodiment provides a ballastless track structure suitable for micro rail transit ground lines, including a base 1, ballastless track units, and a concrete structure.

[0037] The base 1 is a reinforced concrete structure. The concrete is poured after the steel bars are tied, or a precast reinforced concrete structure is used. At the joints of the precast sections, cast-in-place reinforced concrete is used for effective connection.

[0038] The ballastless track unit includes a prefabricated sleeper plate 3 and two limiting blocks 6. The prefabricated sleeper plate 3 is used to support and limit the track, and is set on the base 1. A groove is reserved on the upper part of the prefabricated sleeper plate 3 for placing the bottom structure of the channel rail 7. The groove is longitudinally continuous on the upper part of the prefabricated sleeper plate 3, and the bottom of the channel rail 7 is limited by the groove.

[0039] The two limiting blocks 6 are precast reinforced concrete and are located on both sides of the channel rail 7. They laterally wrap around the channel rail 7 and the precast sleeper plate 3. In order to achieve good wrapping, the limiting blocks 6 need to be adapted to the side of the channel rail 7. Therefore, the structures of the two limiting blocks are not the same. The limiting blocks 6 are attached to the upper surface and side of the precast sleeper plate 3. The limiting blocks need to extend downward to contact the base 1.

[0040] The concrete structure is cast-in-place on the sides of the limiting block 6 and is connected to the limiting block 6 and the base 1 by steel bars to form an integral structure. The concrete structure is made of foamed concrete, which is used to fill the two sides of the track structure after the limiting block 6 is installed. The filled area is a trapezoidal structure. The use of foamed concrete trapezoidal filling provides elastic adjustment while reducing noise.

[0041] The embodiment sets a ballastless track unit including a prefabricated sleeper plate and two limiting blocks, concrete is cast on the side of the limiting block 6, and is connected with the limiting block 6 and the base 1 through steel bars to form an integral structure, and the channel steel rail 7 and the prefabricated sleeper plate 3 are wrapped inside, which realizes the installation of the channel steel rail 7 without fasteners, and can provide sufficient stability.

[0042] The matching surface of the channel steel rail 7, the limiting block 6 and the prefabricated sleeper plate 3 is covered with an elastic sleeve, which is made of synthetic fiber or rubber and is used to absorb high-frequency vibration generated by the track. During construction, the sleeve can be installed on the limiting block 6 before the limiting block is installed.

[0043] The elastic sleeve is arranged on both sides of the channel steel rail 7 and between the rail and the limiting block. The elastic sleeve is fixed on the limiting block to provide elastic force for the rail, reduce the influence of vibration, absorb noise, and achieve the effect of replacing fasteners.

[0044] The application number 201420801090X Chinese utility model patent mentioned in the background art uses prefabricated concrete track plates and concrete rail grooves, and a cast-in-place concrete connecting layer is arranged between the two. Since the strength of the cast-in-place concrete is small, the thickness of the connecting layer is not easy to control during the placement of the concrete rail groove on the laid concrete track plate, which makes it difficult to guarantee the bonding performance between the two prefabricated parts, and the cracking is easy to occur under the long-term repeated impact load and vibration load of the train, which affects the normal use of the line operation and the smoothness and stability of the train.

[0045] The prefabricated sleeper plate 3 and the base 1 of the embodiment have a connecting layer therebetween, and the prefabricated sleeper plate 3 and the base 1 are provided with a cushion layer 2 formed by cement asphalt mortar pouring, which has good bonding performance and also serves as elastic adjustment to level and buffer the track structure. Although the thickness is not easy to control and the bonding performance is difficult to guarantee, the structure of the embodiment is an integral structure, the cushion layer 2 is wrapped inside the structure, the influence caused by the bonding performance problem is not great, and the cushion layer itself has elasticity to buffer the vibration. In addition, the setting of the elastic sleeve 5 at the bottom and the side of the channel steel rail 7 can not only buffer and reduce the vibration, but also provide a certain elastic movement space.

[0046] In other words, due to the overall limiting effect of the track structure, the channel steel rail 7 and the prefabricated sleeper plate 3 can move within a certain space, but only within the safe and reasonable deformation range provided by the elastic material, which realizes good vibration reduction and indirectly overcomes the problem of thickness not easy to control and bonding performance difficult to guarantee of the connecting layer.

[0047] As Figure 3As shown, the prefabricated sleeper plate 3 is provided with a plurality of vertical limiting grooves 11 on both sides, and the base 1 is provided with limiting piers 12 matched with the limiting grooves 11. The longitudinal and transverse displacement of the prefabricated sleeper plate is limited by the limiting action between the limiting grooves 11 and the limiting piers 12 on the base 1. The limiting piers 12 are made of reinforced concrete and are integrally poured with the base 1, thereby playing the role of vertical fixing support and horizontal constraint.

[0048] Embodiment Two

[0049] The embodiment provides a construction method of a ballastless track structure according to the ballastless track structure in Embodiment One, and includes the following steps:

[0050] After a trapezoidal foundation pit for installing the ballastless track structure is excavated in the ground roadbed 9 (the roadbed is the road surface and the part below after normal construction is completed), the reinforced concrete base 1 and the limiting piers 12 are poured, the cushion 2 made of cement asphalt mortar is poured as bonding and elastic adjustment, the prefabricated sleeper plate 3 is installed, the elastic sheath is installed on the side of the prefabricated sleeper plate 3 at the limiting piers 12 according to the alignment of the limiting grooves 11, the elastic sheath 5 is installed at the bottom of the channel-shaped steel rail 7, the prefabricated sleeper plate 3 is clamped at the limiting grooves 11, the longitudinal joint 13 between the prefabricated plates is filled by pouring foam concrete, the elastic sheath 5 is installed on both sides of the channel-shaped steel rail 7 at the limiting blocks 6, the foam concrete 4 of the whole track structure is poured on both sides and is respectively connected with the base 1 and the limiting blocks 6 through the reserved steel bars, and finally the asphalt layer 8 is laid on the upper part to form a single-track ballastless track structure.

[0051] Embodiment Three

[0052] As shown in the figure, the embodiment provides a ballastless track structure suitable for a micro track traffic ground line, and the difference between the track structure of the embodiment and that of Embodiment One is that the track structure of the embodiment is a double-track structure. Figure 2 The ballastless track structure includes two ballastless track units as in Embodiment One, and a transverse support beam 10 is arranged between the two ballastless track units.

[0053] The concrete structure is cast in place on the side of the limiting block 6 and is connected with the limiting block 6 and the base 1 through the steel bars to form an integral structure. The concrete structure on the outer side is the same as that in Embodiment One, and the concrete structure on the inner side is arranged between the transverse support beam 10 and the base 1 and also needs to be connected through the steel bars.

[0054] The transverse support beam 10 is arranged along the longitudinal direction of the track at intervals. The transverse support beam 10 is a prefabricated reinforced concrete structure, and after being installed and positioned on site, foam concrete is poured. The transverse support beam 10 plays the role of strengthening the rigidity of the transverse support structure, and the longitudinal placement interval is selected according to actual needs.

[0055] Embodiment Four

[0056]

[0057] ​The present embodiment provides a construction method of the ballastless track structure according to the embodiment three, comprising the following steps:

[0058] After the trapezoidal foundation pit for installing the ballastless track structure is excavated in the ground roadbed 9, the reinforced concrete base 1 is poured, the cushion 2 poured by the cement asphalt mortar is used as the bonding and elastic adjustment, the prefabricated sleeper plate 3 is installed, the elastic sleeve is installed on the side of the prefabricated sleeper plate 3 at the limiting block 6 of the groove-shaped steel rail 7, the foam concrete 4 is poured on both sides of the track structure, the foam concrete 4 is poured in sequence, the transverse support beam 10 is placed, the foam concrete 4 is poured in the middle of the two track structures, and finally the asphalt layer 8 is paved on the upper part to form the double-track ballastless track structure.

[0059] Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any person skilled in the art can make possible changes and modifications to the technical solutions of the present application by using the disclosed methods and technical contents without departing from the spirit and scope of the present application. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, which does not depart from the technical solutions of the present application, shall fall within the protection scope of the technical solutions of the present application.

Claims

1. A ballastless track structure suitable for use in a ground line of a mini-rail transit, characterized in that, The utility model relates to a double-track ballastless track structure, comprising: a base; a ballastless track unit comprising a prefabricated sleeper slab provided on the base, the prefabricated sleeper slab having a recess on the upper portion for placing the bottom structure of a channel-shaped steel rail; further comprising two limiting blocks provided on both sides of the channel-shaped steel rail, laterally wrapping the channel-shaped steel rail and the prefabricated sleeper slab; the limiting blocks are attached to the upper surface and side surface of the prefabricated sleeper slab, and the limiting blocks extend downward to contact the base; a concrete structure cast in situ on the side surface of the limiting blocks and integrally formed with the limiting blocks and the base through steel bars; a plurality of limiting grooves are provided on both sides of the prefabricated sleeper slab, and a limiting pillar is provided on the base and cooperates with the limiting grooves; a transverse support beam is provided between two ballastless track units; a concrete structure cast in situ on the side surface of the limiting blocks and integrally formed with the limiting blocks and the base through steel bars.

2. A ballastless track structure for a ground line of a mini-rail transit system according to claim 1, characterized in that, The mating surface of the channel-shaped steel rail, the limiting blocks and the prefabricated sleeper slab is covered with an elastic spacer sleeve.

3. A ballastless track structure for a ground line of a mini-rail transit system according to claim 1, characterized in that, A cushion layer made of cement asphalt mortar is provided between the prefabricated sleeper slab and the base.

4. A ballastless track structure for a ground line of a mini-rail transit system according to claim 1, characterized in that, The concrete structure is made of foamed concrete cast in situ.

5. A ballastless track structure for a ground line of a mini-rail transit system according to claim 1, characterized in that, The transverse support beam is arranged along the longitudinal direction of the track at intervals.

6. A ballastless track structure for a ground line of a mini-rail transit system according to claim 1, characterized in that, The inner concrete structure is arranged between the transverse support beam and the base.

7. A method for constructing a ballastless track structure for a ground line of a mini-track transportation system according to any one of claims 1 to 6, characterized in that The steps include: excavating a trapezoidal foundation pit for installing the ballastless track structure on the ground embankment, pouring a reinforced concrete base, installing a prefabricated sleeper slab, respectively assembling the prefabricated sleeper slab, the channel-shaped steel rail and the limiting blocks to form two ballastless track units, pouring concrete on both sides of the overall track structure, and sequentially pouring concrete, placing a transverse support beam and pouring concrete in the middle of the two ballastless track units to form a double-track ballastless track structure.

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