Rail embedded floating track bed

Abstract

The present application relates to a kind of steel rail embedded floating track bed, including multiple groups of track unit, each group of track unit includes two groups of steel rail, track bed, two groups of rail slot, several groups of filling material, several groups of air bag, several groups of rail pad and several groups of vibration isolation element, two groups of rail slot are symmetrically formed in track bed top, two groups of steel rail are installed in two groups of rail slot respectively, several groups of vibration isolation element are arranged in the gap between track bed and underlying bridge, tunnel foundation.This application, steel rail adjustment can be carried out after filling material is in place, avoid filling material to the steel rail in already adjusted state and interfere, steel rail adjustment can be carried out at any time, convenient and fast, solve the problem that traditional embedded track is difficult to adjust after filling material solidification forming, and the vertical adjustment of steel rail can be carried out by the height of floating track bed vibration isolation element, and the lateral adjustment of steel rail can be realized by changing the air pressure in air bag.

Description

Technical Field

[0001] This invention relates to the field of urban rail transit technology, specifically to a rail-embedded floating track bed. Background Technology

[0002] Embedded rail track differs from rail fasteners that fix rails to the surface of the track bed. Instead, the rails are embedded in pre-drilled grooves in the track bed, and then filled with material to enclose them. There are two types: with and without fasteners. Both types involve filling the space around the rails with material, which is mostly elastic. Embedded rail track is primarily used in low-speed trams.

[0003] To reduce the use of track components, simplify the construction process, and improve construction efficiency, most track types in China currently use fastener-free designs. These tracks rely mainly on the filling material around the rails to maintain their normal geometric shape.

[0004] For example, the invention patent with Chinese patent announcement number CN103352401B proposes an embedded track. Before placing the rails, the retainer needs to be glued to both sides of the rails according to certain requirements. After the rails are placed in the groove, the distance between the two rails is adjusted by a special tool. After the track gauge is adjusted, the positioning block matching the support frame is placed to fix the position of the rails. After the adjustment is in place, the adhesive is evenly sprayed in the groove. After the adhesive reaches the required level, the mixed polymer noise-reducing filler is poured into the gap in the groove. After the pouring material is cured, the entire system is locked, and the construction is completed. However, the above-mentioned embedded track has the following drawbacks: 1. In order not to excessively weaken the strength of the track bed itself, the track groove size is usually not very large, only slightly larger than the maximum width of the rail. Therefore, the space reserved for filling material after the rail is finely adjusted is very small, making operation difficult; 2. Pouring the filling material is a close-to-the-rail operation, which can easily affect the already finely adjusted rail shape and position; 3. Once rail shape and position errors occur due to the above reasons, the rail smoothness will not meet the design requirements, and it will be difficult to adjust later. This will directly affect the driving comfort after operation and the service life of the train and track. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] This invention provides a rail-embedded floating track bed, which solves the problems mentioned in the background art.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the present invention provides the following technical solution: a rail-embedded floating track bed, comprising multiple sets of track units. Each set of track units includes two sets of rails, a track bed, two sets of rail grooves, several sets of filling materials, several sets of airbags, several sets of rail pads, and several sets of vibration isolation elements. The two sets of rail grooves are symmetrically formed on the top of the track bed, and the two sets of rails are respectively installed in the two sets of rail grooves. The several sets of vibration isolation elements are disposed in the gap between the track bed and the bridge or tunnel foundation below, and the top of the several sets of vibration isolation elements is connected to the track bed, and the bottom of the several sets of vibration isolation elements is connected to the bridge or tunnel foundation, so that the track bed forms a floating track bed.

[0009] The rail groove forms multiple sets of first sub-grooves and multiple sets of second sub-grooves, which are staggered. Each set of first sub-grooves is detachably separated from the adjacent second sub-grooves by a groove partition plate. The rail passes through the first and second sub-grooves. Each set of second sub-grooves is equipped with an inflatable and deflated airbag separated by the rail, so that the rail is adjusted in the lateral position by the airbags on both sides. Each set of second sub-grooves has a rail underplate installed at the bottom, which is located below the rail to adjust the vertical position of the rail. Each set of first sub-grooves is filled with a filling material that fits the web of the rail.

[0010] Preferably, the airbag is equipped with an adjustment valve, which allows the air pressure inside the airbag to be adjusted after being connected to an external air source.

[0011] In a further preferred embodiment, the filling material is an elastic material, and is formed by casting and curing using an elastic precast block or an elastic material such as rubber or polyurethane.

[0012] In a further preferred embodiment, the width of the rail groove is greater than the width of the rail, the depth of the rail groove is less than the height of the rail, and the length of the rail groove matches the length of the rail.

[0013] In a further preferred embodiment, a ditch is formed in the middle of the surface of the bridge or tunnel foundation, and the ditch is located below the track bed.

[0014] In a further preferred embodiment, the rail is configured as an "I"-shaped rail or a channel rail.

[0015] In a further preferred embodiment, the track bed is configured as a reinforced concrete non-prestressed structure.

[0016] In a further preferred embodiment, there is a gap between the track beds in two adjacent sets of track units, and the track grooves in two adjacent sets of track units are interconnected to form a continuous structure.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a rail-embedded floating track bed, which has the following beneficial effects:

[0019] 1. In this invention, the rail adjustment can be carried out after the filling material is fixed in place, so as to avoid interfering with the already adjusted rail when filling the material.

[0020] 2. In this invention, the rail can be adjusted at any time, which is convenient and quick. This solves the problem that traditional embedded rails are difficult to adjust after the filling material has been cured and formed. Furthermore, the vertical adjustment of the rail can be made by adjusting the height of the floating track bed vibration isolation element, and the horizontal adjustment of the rail can be achieved by changing the air pressure inside the airbag.

[0021] 3. In this invention, the prefabricated filling material and airbags can be replaced, which avoids abnormal rail condition due to material failure. It also provides convenient conditions for routine flaw detection, grinding and maintenance of the rails after the line is in operation, which greatly reduces the operating cost required by traditional embedded rails.

[0022] 4. In this invention, the rails are erected in the rail grooves, so that the rails are in a continuous support state, which solves the problems such as rail corrugation caused by the fastener point support of traditional floating track beds, optimizes the track structure, improves the wheel-rail relationship, and the rail-embedded floating track bed also has the advantages of large vertical adjustment range and good vibration reduction performance of floating track beds. Attached Figure Description

[0023] Figure 1 A schematic plan of the rail-embedded floating track bed according to the implementation plan;

[0024] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at point AA;

[0025] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure at point BB;

[0026] Figure 4 This is a schematic diagram of the connection plan of the buried floating track bed according to the implementation plan.

[0027] In the diagram: 1. Rail; 2. Track bed; 3. Rail groove; 31. First sub-groove; 32. Second sub-groove; 33. Groove partition plate; 4. Filling material; 5. Airbag; 6. Rail pad; 7. Vibration isolation element; 8. Bridge and tunnel foundation; 9. Void; 10. Ditch. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on 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.

[0029] Please see Figure 1-4 A type of embedded floating track bed includes multiple sets of track units, which can be installed on bridge or tunnel foundations 8 to form a continuous track. Each track unit includes two sets of rails 1, track bed 2, two sets of rail grooves 3, several sets of filling materials 4, several sets of airbags 5, several sets of rail pads 6, and several sets of vibration isolation elements 7.

[0030] In this embodiment, the rail 1 can be an "I"-shaped rail or a channel rail commonly used in rail transit. The rail 1 is a prefabricated component, and for ease of installation and transportation, its length can be matched with the track bed. For example, the length of the rail 1 can be set to 1 / 2, 1 / 3, 1 / 4 of the track bed length, etc. During assembly, multiple sections of rail 1 can be used to form a continuous structure.

[0031] In this embodiment, the track bed 2 can be a reinforced concrete non-prestressed structure, and can be formed by on-site casting or factory prefabrication. A gap 9 exists between the track bed 2 and the bridge / tunnel foundation 8, and this gap 9 is formed after the track bed 2 is jacked up. Two sets of rail grooves 3 are symmetrically formed on the top of the track bed 2 to accommodate the installation of the rails 1, and the two sets of rails 1 are respectively installed in the two sets of rail grooves 3 on the same set of track bed 2.

[0032] In this embodiment, multiple sets of first sub-slots 31 and multiple sets of second sub-slots 32 are formed within the rail groove 3. The multiple sets of first sub-slots 31 and multiple sets of second sub-slots 32 are staggered, and the rail 1 passes through the first sub-slots 31 and second sub-slots 32 during installation. An inflatable and deflated airbag 5, separated by the rail 1, is installed in the second sub-slot 32. An adjusting valve is installed on the airbag 5, allowing it to be connected to an external air source to adjust the air pressure inside the airbag 5, thus adjusting the position of the rail 1 in the lateral direction by the force exerted by the airbags 5 on both sides. Each set of first sub-slots 31 is filled with a filling material 4, which is adhered to the rail web of the track bed 2 during construction. The filling material 4 mainly serves to support the rail 1. The left and right rails 1 maintain their gauge and geometric shape through the cured filling material 4, while effectively buffering the impact and vibration loads applied to the rails 1 by the train. Each group of first sub-slots 31 and adjacent second sub-slots 32 is detachably equipped with a slot partition 33. During installation, the slot partition 33 is inserted downwards from the top of the rail 1 between the first sub-slot 31 and the second sub-slot 32. The slot partition 33 is used to position the tooling required for pouring the filling material 4. The tooling used for pouring the filling material 4 can be inserted from the side into the space between the rail web and the inner wall of the slot partition 33 and seal it, thus ensuring that the first sub-slot 31 and the adjacent second sub-slot 32 are independently separated, preventing the poured filling material 4 from flowing into the second sub-slot 32 and affecting the use of the airbag 5. After the filling material 4 has cured, the tooling and slot partition are removed. It should be noted that the distribution and spacing of the filling material and airbags are not limited to... Figure 1 As shown, any other combination is also possible and is within the scope of protection of this invention. Each of the second sub-slots 32 has a rail pad 6 installed at its bottom. The rail pad 6 can be pressed against the inner wall of the bottom of the second sub-slot 32 by the pressure of the rail itself and the elastic material filling it. The rail pad uses an elastic pad layer, and its main function is to cooperate with the rail 1 to achieve the designed rail bottom slope. In addition, it can also assist in adjusting the precise vertical position of the rail. During construction, rail pads 6 of different thicknesses can be placed according to the measurement results.

[0033] In this embodiment, the width of the rail groove 3 should be greater than the maximum working width of the rail 1, and should provide operating space for the installation, limiting, and disassembly of the airbag and filling material. The depth of the rail groove 3 should be slightly less than the height of the rail 1. This height needs to meet the requirements of normal grinding of the rail 1 during operation and provide installation space for equipment such as transponders. The length of the rail groove 3 matches the length of the rail 1, so that it continuously supports the rail 1.

[0034] In this embodiment, the filling material 4 can be an elastic material such as rubber or polyurethane, and can be used for filling by prefabricated blocks or by casting and curing. Using prefabricated elastic units can avoid the adverse effects of on-site casting construction. The filling material 4 can also be a rigid material. When using rigid material for casting and filling, it needs to be used with tooling to ensure that there is a gap between the cured rigid filling material 4 and the inner wall of the first sub-groove 31, thereby avoiding interference with the pushing of the airbag 5 on the rail 1.

[0035] In this embodiment, several sets of vibration isolation elements 7 are disposed in the gap 9 between the track bed 2 and the bridge / tunnel foundation 8 below. The top of the sets of vibration isolation elements 7 is connected to the track bed 2, and the bottom of the sets of vibration isolation elements 7 is connected to the bridge / tunnel foundation 8, so that the track bed 2 forms a floating track bed. The vibration isolation elements 7 can be steel spring vibration isolators commonly used in the prior art, which will not be described in detail here.

[0036] In this embodiment, a ditch 10 is formed in the middle of the upper surface of the bridge and tunnel foundation 8. The ditch 10 is located below the track bed 2 so as to assist in the drainage of the track.

[0037] In this embodiment, there is a gap between the track bed 2 in two adjacent sets of track units, but the rail grooves 3 in the two adjacent sets of track units are connected to form a continuous structure. The opposing sides of the two sets of rail grooves 3 can be fixed by welding or by connecting and fixing with bolts or other fasteners. The rail grooves 3 can constrain the vertical and lateral differential movement of adjacent floating track bed ends, coordinate deformation, and can replace traditional shear hinges or reduce the number of shear hinges used.

[0038] After the bridge and tunnel foundations 8 have passed inspection and been cleaned, the track bed reinforcement and embedded parts (including the outer cylinder of the rail groove 3 and vibration isolation element 7) are installed. Next, the floating track bed is poured and cured. After the track bed 2 has solidified, a rail pad 6 of appropriate thickness and an airbag 5 are placed in the second sub-groove 32. Then, the rail 1 is inserted into the rail groove 3 for installation. After the rail 1 is placed, filling material 4 is filled into the first sub-groove 31. The track bed 2 is then lifted, and the vertical and longitudinal positions of the rail 1 are adjusted. Next, the core components of the vibration isolation element (composed of steel springs and damping agent) are installed inside the outer cylinder of the vibration isolation element 7. Finally, after re-measuring the track, the designated airbag 5 is pressurized and inflated to fine-tune the lateral position of the rail 1. After the track construction is completed, other auxiliary components required for the track are installed.

[0039] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A type of rail-embedded floating track bed, characterized in that, The track includes multiple sets of track units. Each set of track units includes two sets of rails (1), a track bed (2), two sets of rail grooves (3), several sets of filling materials (4), several sets of airbags (5), several sets of rail pads (6), and several sets of vibration isolation elements (7). The two sets of rail grooves (3) are symmetrically formed on the top of the track bed (2). The two sets of rails (1) are respectively installed in the two sets of rail grooves (3). The several sets of vibration isolation elements (7) are set in the gap (9) between the track bed (2) and the bridge / tunnel foundation (8) below. The top of the several sets of vibration isolation elements (7) is connected to the track bed (2), and the bottom of the several sets of vibration isolation elements (7) is connected to the bridge / tunnel foundation (8), so that the track bed (2) forms a floating track bed. The rail groove (3) contains multiple sets of first sub-grooves (31) and multiple sets of second sub-grooves (32), which are staggered. Each set of first sub-grooves (31) and the adjacent second sub-grooves (32) is detachably separated by a groove partition plate (33). The rail (1) passes through the first sub-grooves (31) and the second sub-grooves (32). Each set of second sub-grooves (32) contains a rail-mounted... 1) Separated and inflatable airbags (5) allow the rail (1) to be adjusted laterally by the airbags (5) on both sides. Each group of second sub-slots (32) is equipped with a rail pad (6) at the bottom. The rail pad (6) is located below the rail (1) to adjust the vertical position of the rail (1). Each group of first sub-slots (31) is filled with filling material (4), and the filling material (4) fits the web of the rail (1).

2. The rail-embedded floating track bed according to claim 1, characterized in that: An adjustment valve is installed on the airbag (5) so that the air pressure inside the airbag (5) can be adjusted after it is connected to an external air source.

3. The rail-embedded floating track bed according to claim 1, characterized in that: The filling material (4) is set as an elastic material.

4. The rail-embedded floating track bed according to claim 3, characterized in that: The filling material (4) is set as an elastic precast block.

5. The rail-embedded floating track bed according to claim 3, characterized in that: The filling material (4) is formed by casting and curing rubber or polyurethane material.

6. The rail-embedded floating track bed according to claim 1, characterized in that: The width of the rail groove (3) is greater than the width of the rail (1), the depth of the rail groove (3) is less than the height of the rail (1), and the length of the rail groove (3) matches the length of the rail (1).

7. The rail-embedded floating track bed according to claim 6, characterized in that: The rail (1) is configured as an "I" shaped rail or a channel rail.

8. The rail-embedded floating track bed according to claim 1, characterized in that: The track bed (2) is configured as a reinforced concrete non-prestressed structure.

9. The rail-embedded floating track bed according to claim 1, characterized in that: A ditch (10) is formed in the middle of the upper surface of the bridge and tunnel foundation (8), and the ditch (10) is located below the track bed (2).

10. A rail-embedded floating track bed according to any one of claims 1-9, characterized in that: There is a gap between the track bed (2) in two adjacent sets of track units, and the track groove (3) in two adjacent sets of track units are connected to each other to form a continuous structure.

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