Prefabricated track plate with convex blocking table and ballastless track
Through the prefabricated track plate and ballless track structure with its own convex stop, the problems of complex construction and maintenance difficulties of traditional ballless tracks are solved, and the effects of simple structure, convenient construction and easy replacement are achieved, and the stability of the track and vibration and noise reduction performance are improved.
Patent Information
- Application Number
- CN202422051968.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-23
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-23
AI Technical Summary
The traditional ballastless track has complex structures, difficult construction, and difficult quality control. The track plates and self-contained concrete layers are prone to damage, the later maintenance work is large, and the track plates are cumbersome, which is not conducive to transportation and installation.
Prefabricated track plates with their own convex stops are adopted. The track plates are pre-tensioned prestressed concrete structures. The isolation layer is attached to the bottom and the bottom of the convex stops, and the buffer layer is attached to the side. The base is made of self-contained concrete cast in place to form a limit groove. The track plate and the base are connected by pre-embedded steel bars.
The track structure is simplified, the concrete usage is reduced, the project volume and construction complexity are reduced, the construction quality and maintenance convenience are improved, and the track stability and vibration and noise reduction function are ensured.
Smart Images
Figure CN223163700U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of ballastless tracks for railways, and particularly relates to a precast track slab with a convex retaining block and a ballastless track. Background Technique
[0002] With the continuous development of railways in China, ballastless tracks are widely used in high-speed railways, intercity railways, urban rail transit, and urban rail transit. The ballastless track technology is becoming more and more mature, and the deficiencies of ballastless tracks are gradually emerging. The function of the ballastless track structure is to fix the position of the rail, provide lower support for the rail, and ensure the longitudinal, transverse, and vertical stability of the rail to ensure the smooth, safe, and comfortable operation of the train.
[0003] As one of the common track structure types of traditional high-speed railway ballastless tracks, the slab ballastless track usually consists of rails, elastic fasteners, precast track slabs, self-compacting concrete layers, reinforced concrete bases, isolation layers, and elastic cushions, etc., which is a three-layer structure system with complex structure and large engineering quantity.
[0004] It is easy to produce peeling or damage between the traditional track slab and the "composite slab" formed by self-compacting concrete. The construction of the self-compacting concrete layer is complex, and the quality control is difficult. The track structure height is relatively high, and the secondary dead load of the bridge is relatively large. The traditional slab ballastless track is a three-layer cast-in-place concrete structure system. The self-compacting concrete layer is prone to diseases, and the later replacement and maintenance workload is large and the operation is relatively difficult. The concrete in the pouring holes of the track slab is prone to diseases such as joint separation and falling off. The portal steel bars of the traditional track slab make the manufacturing of the track slab cumbersome and are not conducive to transportation, storage, and installation. Content of the Utility Model
[0005] The technical problem to be solved by the utility model is to provide a precast track slab with a convex retaining block and a ballastless track, which has a simple structure, small on-site concrete pouring volume, convenient construction, convenient maintenance, and easy replacement.
[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a precast track slab with a convex retaining block, which includes a track slab, an isolation layer, and a buffer cushion layer. Two convex retaining blocks are arranged on the back of the track slab. The convex retaining block is a frustum structure with a large upper part and a small lower part. The isolation layer is pasted at the bottom of the track slab and the bottom of the convex retaining block, and the buffer cushion layer is pasted on the side of the convex retaining block.
[0007] The track slab is precast in the factory and is a pretensioned prestressed concrete structure.
[0008] The isolation layer is a geotextile or a rubber vibration isolation pad.
[0009] The buffer cushion layer includes an inner rubber cushion plate and an outer foam board.
[0010] Both the isolation layer and the buffer cushion layer are installed in the factory.
[0011] The track slab is provided with stress-bearing steel bars longitudinally and transversely along the line. Heat-shrinkable sleeves or small insulating clips are provided at the intersections of the longitudinal and transverse stress-bearing steel bars. Earthing terminals and earthing steel bars are reserved in the precast track slab.
[0012] The convex retaining blocks are arranged before and after the center line along the length direction of the track slab.
[0013] A ballastless track includes a base and the above-mentioned precast track slab with a convex retaining block. The base is cast in situ with self-compacting concrete or fine aggregate concrete, and a limiting groove corresponding to the convex retaining block of the track slab is formed on the upper surface of the base.
[0014] The base is connected to the lower foundation of the bridge and tunnel through embedded steel bars.
[0015] The beneficial effects of the present utility model are as follows: The structure is simple. The track structure is a double-layer structure system, which is only composed of a precast track slab with a convex retaining block, a supporting geotextile isolation layer (elastic cushion layer) and a base, greatly saving the use of concrete materials and having a small amount of work. A geotextile isolation layer and a rubber vibration isolation cushion are pasted at the bottom of the track slab and the bottom of the convex retaining block, realizing good isolation from the base and facilitating later replacement and maintenance. Most of the track construction work is completed in the factory, improving the construction quality. Description of the Drawings
[0016] Figure 1 is a three-dimensional structure schematic diagram of the ballastless track of the present utility model;
[0017] Figure 2 is a cross-sectional structure schematic diagram of the ballastless track of the present utility model;
[0018] Figure 3 is a back structure schematic diagram of the precast track slab with a convex retaining block of the present utility model; Detailed Embodiments
[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model; 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.
[0020] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model 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 therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.
[0021] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "provided with", "sheathed / connected", "connection", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0022] As Figure 1 —3 shows, the precast track slab with a self - contained convex retaining platform of the present utility model includes a track slab 1, an isolation layer 2, and a buffer cushion layer 3. Two convex retaining platforms 5 are arranged on the back of the track slab 1. The convex retaining platform 5 is a frustum structure with a larger upper part and a smaller lower part. The isolation layer 2 is pasted at the bottom of the track slab and the bottom of the convex retaining platform, and the buffer cushion layer 3 is pasted on the side of the convex retaining platform 5.
[0023] The track slab 1 is precast in the factory and is a pretensioned prestressed concrete structure.
[0024] The isolation layer 2 is a geotextile or a rubber vibration isolation pad.
[0025] The buffer cushion layer 3 includes an inner rubber cushion plate and an outer foam board, that is, the foam board is arranged around the rubber cushion plate.
[0026] Both the isolation layer 2 and the buffer cushion layer 3 are installed and completed in the factory.
[0027] The track slab 1 is provided with longitudinal and transverse stress - bearing steel bars along the longitudinal and transverse directions of the line. Heat - shrinkable sleeves or small insulating clips are arranged at the intersections of the longitudinal and transverse stress - bearing steel bars. The precast track slab is provided with grounding terminals and grounding steel bars.
[0028] The convex retaining platforms 5 are arranged before and after along the center line of the length direction of the track slab 1.
[0029] A ballastless track includes a base 4 and the above - mentioned precast track slab with a self - contained convex retaining platform. The base 4 is cast - in - place with self - compacting concrete or fine - aggregate concrete. A limiting groove corresponding to the convex retaining platform 5 of the track slab is formed on the upper surface of the base 4.
[0030] The base 4 is connected to the lower foundation of the bridge and tunnel through embedded steel bars.
[0031] Specifically, the track slab 1 is a precast prestressed reinforced concrete structure in the factory, with stress-bearing steel bars arranged longitudinally and transversely, and a limiting convex retaining platform 5 protruding downward at the bottom. The convex retaining platform 5 is a frustum-shaped platform with a larger upper part and a smaller lower part. The isolation layer 2 is pasted to the bottom of the track slab 1 and the bottom of the convex retaining platform in the factory, and the buffer cushion layer 3 is pasted around the convex retaining platform 5 in the factory. The isolation layer 2 and the buffer cushion layer 3 can achieve the isolation function from the base 4, facilitating later replacement and maintenance. The base 4 is a cast-in-place reinforced concrete structure, formed by on-site casting with self-compacting concrete or fine aggregate concrete, and a limiting groove matching the convex retaining platform 5 is formed during the casting process to achieve the longitudinal and transverse limiting of the track structure.
[0032] The track slab 1 with a built-in convex retaining platform is a precast pretensioned prestressed reinforced concrete structure in the factory. Prestressed steel bars are arranged longitudinally and transversely inside the track slab 1, and heat-shrinkable sleeves or small insulating clips are provided at the intersections of the longitudinal and transverse stress-bearing steel bars. The isolation layer 2 is pasted to the bottom of the track slab 1 and the bottom of the limiting convex retaining platform 5 in the factory to achieve the isolation function from the base 4. The buffer cushion layer 3 is arranged around the convex retaining platform at the bottom of the track slab 1 to isolate the track slab from the base and ensure a certain self-adaptive adjustment function. The base is cast in place with self-compacting concrete or fine aggregate concrete, and a limiting groove matching the concrete of the convex retaining platform is formed in the base. A welded steel mesh is arranged inside the base, and the welded steel mesh is processed in the factory.
[0033] In one of the embodiments, the track slab 1 is a precast double-way prestressed reinforced concrete structure in the factory; preferably, the concrete grade used for the track slab 1 is C60. Further, the above track structure is simple in composition, a double-layer structure system, facilitating production, construction, and later replacement and maintenance, with a small amount of work. At the same time, an isolation layer 2 and a buffer cushion layer 3 are provided between the track slab 1 and the base 4, facilitating the later removal and replacement of the track slab 1. In this scheme, a limiting convex retaining platform 5 protruding downward is provided at the bottom of the track slab 1, with 2 in the unit slab. The retaining platform is a frustum-shaped platform with a larger upper part and a smaller lower part. The load borne by the track slab 1 can be better transmitted through the limiting retaining platform, maintaining the stability of the track structure.
[0034] The rail structure is installed on the rail seat through fasteners. The installation structures of the rail seat and the rail are conventional techniques in the art and will not be elaborated here.
[0035] A buffer cushion layer 3 is arranged around the limiting retaining platform at the bottom of the track slab 1 to achieve the longitudinal and transverse displacement of the track structure under the action of the load.
[0036] The utility model utilizes the convex baffles and base of the track plate for positioning, eliminating the self-compacting concrete layer of the traditional CRTS III slab ballastless track. It is a double-layer structural system that is more economical while ensuring that the structural strength meets the requirements. The gate-type steel bars of the traditional CRTS III track plate are eliminated, which facilitates the manufacture, processing, transportation, installation, and subsequent maintenance and repair of the track structure. The new structural solution is simple in structure, easy to construct, and requires little engineering work, which improves the technical and economic efficiency of the entire structure. At the same time, the bottom of the track plate is isolated from the base by geotextile, which makes maintenance and repair convenient and easy to replace. The track plate also has its own limiting bosses, which ensures the stability of the track structure and is beneficial to the safety and durability of the track structure. The track plate eliminates the pouring holes and observation holes, ensuring the integrity of the track plate and reducing weak links. The base is poured with self-compacting concrete or fine stone concrete on both sides of the track plate, which improves construction efficiency and ensures construction quality. Eliminating the self-compacting concrete layer reduces structural height, concrete usage, and weight, reducing the second-phase dead load on the bridge, alleviating weaknesses in the ballastless track system and lowering project costs. Eliminating the gate-shaped steel bars in the track slabs facilitates their production and transportation. The track structure boasts high overall structural rigidity, and the geotextile can be replaced with elastic vibration isolation pads. The urban track structure offers vibration and noise reduction capabilities, effectively controlling the transmission of structural vibrations. The base also features structural adjustment capabilities. If the lower structure deviates from construction, adjusting the base structural dimensions can mitigate the effects.
[0037] The utility model has a double-layer structure system with simple composition, convenient construction, small engineering workload, small later maintenance and repair workload, and is easy to replace. It can be widely used in high-speed railway ballastless track systems. In addition, the limiting convex baffle is set on the track plate. The interaction between the convex baffle of the track plate and the limiting groove of the base ensures the longitudinal and lateral stability of the track structure. At the same time, the self-compacting concrete layer in the traditional plate track structure is eliminated, reducing the on-site construction and later replacement and maintenance workload, eliminating the weak structural layer, reducing the height of the track structure, reducing the amount of concrete pouring, and setting an isolation layer at the bottom of the track plate and the bottom of the convex baffle, which is conducive to later replacement and maintenance. At the same time, the track system has the function of reducing vibration and noise. Most of the work of ballastless track construction is completed in the factory, the amount of concrete poured on site is reduced, the construction process is reduced, the construction time is saved, and the construction quality is improved.
[0038] In summary, the content of the present invention is not limited to the above-mentioned embodiments. People with insight in the same field can easily propose other embodiments within the technical guiding ideology of the present invention, but such embodiments are all included in the scope of the present invention.
Claims
1. A precast track slab with a built-in convex retaining platform, comprising a track slab (1), an isolation layer (2), and a buffer cushion layer (3), characterized in that, On the back of the track slab (1), two convex retaining blocks (5) are provided. The convex retaining blocks (5) are frustum structures with a larger upper part and a smaller lower part. An isolation layer (2) is pasted on the bottom of the track slab and the bottom of the convex retaining blocks, and a buffer cushion layer (3) is pasted on the side of the convex retaining blocks (5).
2. The precast track slab with a self - contained convex retaining platform according to claim 1, wherein, The track slab (1) is precast in the factory and is a pretensioned prestressed concrete structure.
3. The precast track slab with a self - contained convex retaining platform according to claim 1, characterized in that, The isolation layer (2) is a geotextile or a rubber vibration isolation pad.
4. The precast track slab with a self - contained convex retaining platform according to claim 1, wherein, The buffer cushion layer (3) includes an inner rubber cushion plate and an outer foam board.
5. The precast track slab with a self - contained convex retaining platform according to claim 1, 3 or 4, characterized in that, Both the isolation layer (2) and the buffer cushion layer (3) are installed in the factory.
6. The precast track slab with a self - contained convex retaining platform according to claim 2, wherein, The track slab (1) is provided with longitudinal and transverse stress-bearing steel bars along the line. Heat shrinkable sleeves or small insulating clips are provided at the intersections of the longitudinal and transverse stress-bearing steel bars. Grounding terminals and grounding steel bars are reserved in the precast track slab.
7. The precast track slab with a self - contained convex retaining platform according to claim 1, wherein, The convex retaining blocks (5) are arranged before and after the center line of the track slab (1) along the length direction.
8. A ballastless track, comprising a base (4) and a precast track slab with a convex retaining block according to any one of claims 1-7, characterized in that, The base (4) is cast in place with self-compacting concrete or fine aggregate concrete. A limiting groove corresponding to the convex retaining blocks (5) of the track slab is formed on the upper surface of the base (4).
9. The ballastless track according to claim 8, wherein The base (4) is connected to the lower foundations of bridges and tunnels through embedded steel bars.