Floating type roadbed slab structure with prestress

Abstract

The floating roadbed slab structure with the prestress comprises a concrete base, a roadbed is arranged above the concrete base, an anti-vibration pad is arranged between the concrete base and the roadbed, a plurality of prestress vertical connecting devices connected with the anti-vibration pad and the roadbed into a whole are embedded in the concrete base, and a mounting groove is formed in the upper end face of the roadbed. And the upper end of the prestressed vertical connecting device is wrapped and sealed by sealant which is filled in the mounting groove and is flush with the upper end surface of the ballast bed. On the premise of transverse and longitudinal constraint of the ballast bed, the elastic constraint of the vertical displacement of the ballast bed is realized by arranging the prestressed vertical connecting device which is used for vertically and elastically connecting the concrete base with the anti-vibration pad and the ballast bed; the floating roadbed slab can reach a stable state more quickly in the process that a train wheel pair passes through and a train body or a bogie nodding, so that the floating roadbed slab can better participate in a secondary working state, the wheel-rail relation is better kept when a train passes through, and therefore the anti-vibration pad and the roadbed can better play the roles of the anti-vibration pad and the roadbed.

Description

Technical Field

[0001] The utility model belongs to the technical field of rail transit, and particularly relates to a floating track slab structure with prestress. Background Art

[0002] In the traditional floating track slab, elastic materials are inserted between the track bed and the base to achieve the effect of vibration reduction and noise reduction when the train passes through this section. In order to prevent lateral and longitudinal displacement during the train passing, limit bosses or hinges are specially set; when the train passes under the rated load or the car body or the bogie nods and rotates, the floating slab will generate an upward displacement, and this limit boss or hinge cannot play a constraining role on this vertical displacement. It is very difficult for the track slabs in this section to reach a stable state quickly after the train wheels pass at high speed. Therefore, the floating track slab will participate in the secondary working state before returning to the initial state, resulting in changes in the wheel-rail relationship and further affecting the vibration reduction effect. Therefore, in view of the above problems, it is necessary to make improvements. Content of the Utility Model

[0003] The technical problem solved by the utility model: Provide a floating track slab structure with prestress. On the premise of lateral and longitudinal constraints of the track bed, by setting prestressed vertical connection devices that vertically and elastically connect the concrete base, the damping pad and the track bed, elastic constraint on the vertical displacement of the track bed is realized, and the floating track slab can reach a stable state faster during the passing of the train wheelset and the nodding of the car body or the bogie, so as to better participate in the secondary working state and better maintain the wheel-rail relationship when the train passes, so that the damping pad and the track bed can better play their roles.

[0004] The technical solution adopted by the utility model: A floating track slab structure with prestress, including a concrete base, a track bed is arranged above the concrete base, and a damping pad is arranged between the concrete base and the track bed. A number of prestressed vertical connection devices connected to the damping pad and the track bed as a whole are pre-buried on the concrete base. An installation groove is arranged on the upper end surface of the track bed, and a sealing glue filled in the installation groove and flush with the upper end surface of the track bed wraps and seals the upper end of the prestressed vertical connection device.

[0005] Wherein, the prestressed vertical connection device includes a T-shaped embedded part, an elastic sleeve and a nut. The large head end of the T-shaped embedded part is arranged downward, and the elastic sleeve is sleeved on the small diameter section of the T-shaped embedded part. The lower ends of the T-shaped embedded part and the elastic sleeve are cast integrally with the concrete base. The upper ends of the T-shaped embedded part and the elastic sleeve extend out of the damping pad and the track bed in sequence, and the threaded part at the upper end of the T-shaped embedded part is adapted to be connected with the nut in the installation groove. A rubber washer sleeved on the T-shaped embedded part is arranged between the nut and the bottom surface of the installation groove.

[0006] Further, the sealant wraps the nut and the upper end of the T-shaped embedded part inside it.

[0007] Further, the elastic sleeve is a rubber sleeve.

[0008] Further, the roadbed includes a cast-in-place concrete roadbed, and installation grooves and through holes concentrically connected to the installation grooves are reserved on the cast-in-place concrete roadbed.

[0009] Further, the roadbed includes a precast roadbed slab, and installation grooves and through holes concentrically connected to the installation grooves are reserved on the precast roadbed slab.

[0010] Further, self-compacting concrete is provided on the upper end surface of the concrete base, and grouting holes for pouring self-compacting concrete are reserved on the precast roadbed slab, and the vibration damping pad is arranged between the self-compacting concrete and the precast roadbed slab.

[0011] Advantages of the present utility model compared with the prior art:

[0012] 1. Based on the original horizontal and vertical constraints of the roadbed, by setting a prestressed vertical connection device that vertically elastically connects the concrete base with the vibration damping pad and the roadbed, elastic constraint on the vertical displacement of the roadbed is realized, making the floating roadbed slab more reliable and stable;

[0013] 2. By sleeving an elastic sleeve on the T-shaped embedded part in this technical solution, it is beneficial to the vibration reduction and noise reduction of the roadbed, and at the same time, it is convenient for the roadbed to reset in time. During the passing of the train wheel set and the nodding of the car body or bogie, the floating roadbed slab can reach a stable state faster, so as to better participate in the secondary working state;

[0014] 3. By restricting the vertical displacement of the roadbed, the wheel-rail relationship during the passing of the train is better maintained, so that the vibration damping pad and the roadbed can better play their roles;

[0015] 4. The structure of this technical solution is simple and scientifically reasonable. The locking connection position of the T-shaped embedded part is wrapped and sealed inside by the sealant. On the one hand, it prevents water accumulation at the connection position, and on the other hand, it can judge whether the nut is loose by judging whether there are cracks in the sealant, which is convenient for inspection, replacement and later maintenance. Description of the Drawings

[0016] Figure 1 is a schematic structural diagram of the first embodiment of the present utility model;

[0017] Figure 2 is a schematic structural diagram of the second embodiment of the present utility model. Detailed Embodiment

[0018] The following will be combined with the embodiments of the present utility model Figure 1-2, the technical solutions in the embodiments of the present utility model are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] It should be noted that in this article, unless otherwise stated, it should be understood that: the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present invention. In addition, terms such as "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0020] In this article, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation. The element defined by the statement "comprising one......" does not exclude the existence of additional identical elements in the process, method, article or device comprising the said element.

[0021] The floating track slab structure with prestress includes a concrete base 1. A track bed 2 is provided above the concrete base 1, and a vibration damping pad 3 is provided between the concrete base 1 and the track bed 2. A number of prestressed vertical connecting devices connected integrally with the vibration damping pad 3 and the track bed 2 are embedded in the concrete base 1. An installation groove 9 is provided on the upper end surface of the track bed 2, and a sealant 4 filled in the installation groove 9 and flush with the upper end surface of the track bed 2 wraps and seals the upper end of the prestressed vertical connecting device. Among them, the sealant 4 is polyurethane glue; in the above structure, on the premise of the original lateral and longitudinal constraints of the track bed 2, by setting the prestressed vertical connecting device that vertically and elastically connects the concrete base 1 with the vibration damping pad 3 and the track bed 2, elastic constraint on the vertical displacement of the track bed 2 is realized, making the floating track slab more reliable and stable; by restricting the vertical displacement of the track bed 2, the wheel-rail relationship during train passing is better maintained, so that the vibration damping pad and the track bed 2 can better play their roles;

[0022] The specific structure of the prestressed vertical connection device is as follows: The prestressed vertical connection device includes a T-shaped embedded part 5, an elastic sleeve 6, and a nut 7. The large end of the T-shaped embedded part 5 is arranged downward, and the elastic sleeve 6 is sleeved on the small-diameter section of the T-shaped embedded part 5. The lower ends of the T-shaped embedded part 5 and the elastic sleeve 6 are cast integrally with the concrete base 1. The upper ends of the T-shaped embedded part 5 and the elastic sleeve 6 extend out of the vibration damping pad 3 and the track bed 2 in sequence, and the threaded part at the upper end of the T-shaped embedded part 5 is adaptively connected with the nut 7 in the installation groove 9. A rubber washer 8 sleeved on the T-shaped embedded part 5 is arranged between the nut 7 and the bottom surface of the installation groove 9; at the beginning, the sealant 4 wraps the nut 7 and the upper end of the T-shaped embedded part 5 inside it; specifically, the elastic sleeve 6 is a rubber sleeve; in the above structure, by sleeving the elastic sleeve 6 on the T-shaped embedded part 5, it is beneficial to the vibration reduction and noise reduction of the track bed 2, and at the same time, it is convenient for the track bed to reset in time. It can make the floating track bed plate reach a stable state faster during the passing of the train wheel pair and the nodding process of the car body or bogie, so as to better participate in the secondary working state;

[0023] The first embodiment is as follows Figure 1 shown. The track bed 2 includes a cast-in-place concrete track bed 2-1, and an installation groove 9 and a through hole concentrically communicating with the installation groove 9 are reserved on the cast-in-place concrete track bed 2-1; The construction steps of using the cast-in-place concrete track bed 2-1 are as follows: ① Embedding the T-shaped embedded part 5, the rubber sleeve, and pouring the concrete of the concrete base 1; ② Brushing and pasting the vibration damping pad 3; ③ Pouring the cast-in-place concrete track bed 2-1 and reserving the installation groove 9 and the through hole; ④ Pasting the vibration damping pad 3 to the bottom surface of the cast-in-place concrete track bed 2-1, and installing the cast-in-place concrete track bed 2-1 and the vibration damping pad 3 on the concrete base 1; ⑤ Installing the nut 7 and the rubber washer; ⑥ Pre-tightening the nut 7 to the designed position; ⑦ Filling the polyurethane sealant into the installation groove 9 to wrap the nut 7 inside it.

[0024] The second embodiment is as follows Figure 2As shown in the figure, the roadbed 2 includes a precast roadbed slab 2-2, and installation grooves 9 and through holes concentrically communicating with the installation grooves 9 are reserved on the precast roadbed slab 2-2; specifically, a self-compacting concrete 10 is provided on the upper end surface of the concrete base 1, and grouting holes 2-3 for pouring the self-compacting concrete 10 are reserved on the precast roadbed slab 2-2. The vibration damping pad 3 is arranged between the self-compacting concrete 10 and the precast roadbed slab 2-2. The specific implementation steps are as follows: ① The T-shaped embedded parts 5 and rubber sleeves are embedded and cast integrally with the concrete base 1; ② The precast roadbed slab 2-2 is concretely cast, the installation grooves 9 and through holes are reserved, and it is bonded with the vibration damping pad; ③ Before pre-laying, the laying position of the precast roadbed slab 2-2 is positioned, and the position of the embedded T-shaped embedded parts 5 is re-measured. If the difference between the embedded T-shaped embedded parts 5 and the through hole positions on the precast roadbed slab 2-2 is small, the embedded T-shaped embedded parts 5 can be bent to make it consistent with the hole positions on the precast roadbed slab 2-2; if the deviation is large, the embedded T-shaped embedded parts 5 can be cut and re-implanted with chemical anchor bolts; ④ When installing the precast roadbed slab 2-2, the T-shaped embedded parts 5 and rubber sleeves are passed out from the reserved through hole positions; ⑤ The rubber washers 8 under the nuts 7 are installed; ⑥ The nuts 7 are pre-tightened to the designed positions; ⑦ Polyurethane sealant is filled into the installation grooves 9 to wrap the nuts 7 inside.

[0025] In this structure, when the prestressed vertical connection device is set, the lateral spacing is 1.1 m and the longitudinal spacing is 2 m, and 6 are set for 1 standard slab (5.95 m). In this solution, the lower end of the T-shaped embedded part 5 is first embedded into the concrete base 1 to ensure the stability of the T-shaped embedded part 5. Installing a rubber sleeve on the T-shaped embedded part 5 can avoid rigid contact between the roadbed 2 and the T-shaped embedded part 5 and reduce the impact force of the roadbed 2 on the T-shaped embedded part 5; the pre-tightening force of the nut 7 can be measured by the number of exposed threads on the upper end of the T-shaped embedded part 5; finally, filling the sealant 4 can not only prevent water accumulation in the reserved hole positions but also play a role in preventing the nut 7 from loosening.

[0026] The technical solution of the present invention has a simple structure, is scientifically and reasonably designed. The locking connection position of the T-shaped embedded part 5 is wrapped and sealed inside by the sealant. On the one hand, it prevents water accumulation at the connection position, and on the other hand, it can judge whether the nut 7 is loose by judging whether there are cracks in the sealant 4, which is convenient for inspection, replacement and later maintenance.

[0027] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-mentioned exemplary embodiments, and the present utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present utility model. Any reference signs in the claims should not be construed as limiting the claims involved.

[0028] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. The floating ballast plate structure with prestress is characterized by: The invention comprises a concrete base (1), a ballast bed (2) is arranged above the concrete base (1), and a vibration-damping pad (3) is arranged between the concrete base (1) and the ballast bed (2), a plurality of prestressed vertical connection devices connected to the vibration-damping pad (3) and the ballast bed (2) are pre-buried on the concrete base (1), the upper end surface of the ballast bed (2) is provided with a mounting groove (9), and a sealant (4) filled in the mounting groove (9) and flush with the upper end surface of the ballast bed (2) wraps and seals the upper end of the prestressed vertical connection device.

2. The prestressed floating ballast plate structure according to claim 1 is characterized in that: The prestressed vertical connection device comprises a T-shaped embedded part (5), an elastic sleeve (6) and a nut (7); the large end of the T-shaped embedded part (5) is arranged downward, and the elastic sleeve (6) is sleeved on the small diameter section of the T-shaped embedded part (5); the lower ends of the T-shaped embedded part (5) and the elastic sleeve (6) are cast as a whole with the concrete base (1); the upper ends of the T-shaped embedded part (5) and the elastic sleeve (6) extend out of the vibration-damping pad (3) and the ballast (2) in turn; the upper end of the T-shaped embedded part (5) with an external thread is adapted to be connected with the nut (7) in the installation groove (9); a rubber gasket (8) sleeved on the T-shaped embedded part (5) is provided between the nut (7) and the bottom surface of the installation groove (9).

3. The prestressed floating ballast plate structure according to claim 2 is characterized in that: The sealant (4) wraps the nut (7) and the upper end of the T-shaped embedded part (5) inside.

4. The prestressed floating ballast plate structure according to claim 3 is characterized in that: The elastic sleeve (6) is a rubber sleeve.

5. The prestressed floating ballast plate structure according to any one of claims 1 to 4, characterized in that: The roadbed (2) comprises a cast-in-place concrete roadbed (2-1), and a mounting groove (9) and a through hole concentrically connected to the mounting groove (9) are reserved on the cast-in-place concrete roadbed (2-1).

6. The prestressed floating ballast plate structure according to any one of claims 1 to 4, characterized in that: The roadbed (2) comprises a prefabricated roadbed plate (2-2), and a mounting groove (9) and a through hole concentrically connected to the mounting groove (9) are reserved on the prefabricated roadbed plate (2-2).

7. The prestressed floating ballast plate structure according to claim 6 is characterized in that: The upper end surface of the concrete base (1) is provided with self-compacting concrete (10), and a grouting hole (2-3) for pouring the self-compacting concrete (10) is reserved on the prefabricated track bed plate (2-2), and the vibration-damping pad (3) is arranged between the self-compacting concrete (10) and the prefabricated track bed plate (2-2).

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