A prefabricated and assembled detachable concave-convex groove connection track structure

Abstract

The present invention discloses a prefabricated, assembled, detachable concave-convex groove connection type track structure, wherein the prefabricated track beam is connected to the prefabricated base beam via a cast-in-place connection; the prefabricated track beam comprises a track beam longitudinal beam, a track beam transverse beam, a track beam support platform, a track beam boss, and an isolation layer covering the lower end of the track beam boss; the prefabricated base beam comprises a base beam longitudinal beam, a base beam transverse beam, and a base beam groove; the base beam grooves are arranged at intervals on the base beam longitudinal beam, and when the base beam grooves and the track beam bosses are installed, they are in a corresponding upper and lower position state. The track beam boss at the lower end of the prefabricated track beam is inserted into the base beam groove, and then a strength connection is performed through a cast-in-place construction method, thereby improving the assembly rate of the track structure and reducing the workload of on-site casting; according to different vibration reduction requirements, the track beam boss is wrapped with a vibration reduction pad or a vibration reduction pad is added, which can be applied to areas without vibration reduction or with different vibration reduction requirements, reducing the types of track structures, and facilitating the adjustment of the vibration reduction level during the operation phase.

Description

Technical Field

[0001] The present invention relates to the technical field of rail transportation, and in particular to a prefabricated and assembled detachable concave-convex groove connection type rail structure. Background Art

[0002] Tracks are structures that guide rolling stock, directly bear the loads from trains, and transmit these loads to the roadbed, bridges, or tunnels. They are a crucial component of rail transit. Track structures are primarily categorized as ballasted and ballastless. Ballastless track subgrades are divided into cast-in-place monolithic subgrades and precast monolithic subgrades. Currently, precast track in my country primarily includes CRTS I, CRTS II, and CRTS III slab ballastless track, as well as various derived urban rail slab ballastless track types, trapezoidal sleeper ballastless track, and other precast slab track structures with vibration damping.

[0003] Slab track generally adopts a layered structure, which generally includes: prefabricated slabs, filling layers, bases or supporting layers. Trapezoidal sleeper ballastless tracks generally include: prefabricated trapezoidal sleepers, filling layers or vibration-damping pads, and bases. First, the base or supporting layer and the slab track filling layer are all cast-in-place, and the cast-in-place roadbed accounts for a large proportion of the roadbed, generally greater than 50%. Secondly, the filling layer is generally used as a connecting layer, located under the slab, and is poured after the slab adjustment is completed. The workability requirements of the filling layer are high, which increases the cost; the filling layer is a weak part of the roadbed structure and is prone to peeling; the filling layer is located under the slab and is not easy to be found, which poses a safety hazard and brings certain difficulties to maintenance and repair. Thirdly, prefabricated slabs are generally of integral or frame type, and the slabs are large in size, which is not convenient for adapting to complex line shapes. Summary of the Invention

[0004] The invention provides a prefabricated and assembled separable concave-convex groove connection type track structure.

[0005] The present invention is achieved through the following technical solutions:

[0006] A prefabricated and separable concave-convex groove connection track structure comprises a prefabricated track beam, a prefabricated base beam, and a cast-in-place connection portion, wherein the prefabricated track beam is connected to the prefabricated base beam via the cast-in-place connection portion;

[0007] The prefabricated track beam comprises a track beam longitudinal beam, a track beam cross beam, a track beam rail support platform and a track beam convex column, wherein the track beam cross beam is located between the track beam longitudinal beams, the track beam rail support platform is installed on the track beam longitudinal beam, the track beam rail support platform is fixed to the rail by fasteners, and the track beam convex column is arranged in a point shape at the lower end of the track beam longitudinal beam, and the lower end of the track beam convex column is covered with an isolation layer;

[0008] The prefabricated base beam includes a base beam longitudinal beam, a base beam transverse beam and a base beam groove. The two base beam longitudinal beams are connected by two base beam transverse beams. The base beam grooves are arranged at intervals on the base beam longitudinal beam. When the base beam grooves are installed with the track beam bosses, they are in a corresponding upper and lower position.

[0009] Optionally, the width and length of the base beam groove are both greater than the width and length of the track beam boss, the upper surface area of ​​the base beam groove is greater than the bottom area of ​​the track beam boss, and the base beam groove and the track beam boss are mortise-jointed through the cast-in-place connection.

[0010] Optionally, during on-site casting construction, a portion of the lower end of the track beam boss is cast into the base beam groove, and a reserved adjustment amount is provided between the track beam boss 204 and the base beam groove 403 .

[0011] Optionally, the prefabricated track beams and prefabricated base beams are prefabricated frame structures, and the prefabricated track beams and prefabricated base beams are prestressed structures.

[0012] Optionally, according to vibration reduction requirements, a vibration reduction pad can be added inside the isolation layer.

[0013] Optionally, according to different vibration reduction requirements, the material of the isolation layer can be a common isolation material or a vibration reduction material.

[0014] Optionally, the vibration-damping pad and the vibration-damping isolation layer are made of vibration-damping material.

[0015] Optionally, a plurality of prefabricated track beams and the prefabricated base beams are arranged in a longitudinal arrangement.

[0016] Optionally, the track beam longitudinal beam, the track beam cross beam and the track beam boss in the prefabricated track beam are connected by internal steel bars, and the base beam longitudinal beam, the base beam cross beam and the base beam groove in the prefabricated base beam are connected by internal steel bars.

[0017] The prefabricated track beam is 3.5m long, and the prefabricated base beam is 10.7m long. 52% to 63% of the lower end of the track beam boss is cast within the base beam groove. The position of the track beam boss within the base beam groove can be adjusted by no less than 40mm, and the height of the track beam boss within the base beam groove can be adjusted by no less than 30mm. At least two groups of track beam bosses are symmetrically arranged along the longitudinal direction of each prefabricated track beam, with the two groups spaced 3 / 5 the length of the prefabricated track beam. This optimized dimensional design achieves a more efficient balance between load-bearing capacity, adjustability, and complex line requirements.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1) In this technical solution, a prefabricated base beam and a prefabricated track beam are provided. The prefabricated base beam and the prefabricated track beam are connected by a cast-in-place connection part, and a groove is provided on the prefabricated base beam to facilitate the insertion of the boss at the lower end of the prefabricated track beam into the groove, and then the strength connection is achieved through a cast-in-place construction method. Among them, the prefabricated base beam and the prefabricated track beam are both prefabricated in the factory, and only the groove of the prefabricated base beam is cast on-site as a connection part, so that the prefabricated structure accounts for no less than 75% of the track structure, thereby improving the assembly rate of the track structure, reducing the workload of on-site casting, simplifying the construction process, improving construction efficiency, reducing labor, and reducing construction costs.

[0020] 2) In this technical solution, an isolation layer is set under the convex column of the prefabricated track beam. Vibration-damping pads are added inside the isolation layer or vibration-damping materials are used in the isolation layer as needed. This can be applied to areas without vibration damping or areas with different vibration damping requirements, reducing the type of track structure and facilitating the adjustment of vibration damping levels during the operation phase. At the same time, the setting of the isolation layer ensures the convenience of replacing prefabricated panels, thereby facilitating maintenance and repair.

[0021] 3) The track structure described in this technical solution is an assembled frame type, in which the prefabricated track beam and the prefabricated base beam are connected by a convex-concave groove structure of a convex column and a groove. The three directions of the prefabricated track beam are limited in the lower convex column, and the structure of the prefabricated track beam and the prefabricated base beam is clear and the force is simple.

[0022] 4) In this technical solution, the on-site connection part is installed inside the base beam groove of the prefabricated base beam, without the need for supporting formwork, and the construction is simple and quick.

[0023] 5) In this technical solution, the cast-in-place connection is located on the base beam, and there is no hidden construction process during the entire on-site construction process, which reduces safety hazards and improves construction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 It is an exploded schematic diagram of the present invention;

[0026] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the prefabricated track beam in the present invention;

[0028] Figure 5 It is a structural schematic diagram of the prefabricated base beam in the present invention;

[0029] Figure 6 This is a partial schematic diagram of the track beam convex column in the prefabricated track beam

[0030] Among them: 1-rail, 2-precast track beam, 3-cast-in-place connection, 4-precast base beam, 201-track beam longitudinal beam, 202-track beam cross beam, 203-track beam rail support platform, 204-track beam boss, 205-isolation layer, 206-vibration damping pad, 401-base beam longitudinal beam, 402-base beam cross beam, 403-base beam groove. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with examples. The exemplary embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0032] Example 1:

[0033] like Figures 1-6 As shown, a prefabricated, detachable, concave-convex groove track structure includes a prefabricated track beam 2, a prefabricated base beam 4, and a cast-in-place connection 3. The prefabricated track beam 2 is connected to the prefabricated base beam 4 via the cast-in-place connection 3. Train loads are transmitted via the rails 1 to the track beam 2, which in turn transmits the loads to the base beam 4 via the track beam bosses 204. This structure is simple and the force transmission is clear.

[0034] The prefabricated track beam 2 includes a track beam longitudinal beam 201, a track beam crossbeam 202, a track beam rail support 203 and a track beam boss 204. The track beam crossbeam 202 is located between the track beam longitudinal beams 201. The track beam rail support 203 is installed on the track beam longitudinal beam 201. The track beam rail support 203 fixes the rail 1 through fasteners. The track beam boss 204 is arranged in a point shape at the lower end of the track beam longitudinal beam 201. The lower end of the track beam boss 204 is covered with an isolation layer 205.

[0035] The isolation layer 205 ensures that the precast track beam 2 can be easily separated from the cast-in-place layer when replaced while ensuring the precast track beam is stable under stress, thereby facilitating maintenance and repair. The isolation layer 205 is made of materials other than geotextile, rubber, polyester, etc., and can achieve the desired isolation effect.

[0036] The prefabricated base beam 4 includes a base beam longitudinal beam 401, a base beam transverse beam 402 and a base beam groove 403. The two base beam longitudinal beams 401 are connected by two base beam transverse beams 402. The base beam grooves 403 are arranged at intervals on the base beam longitudinal beam 401. When the base beam grooves 403 and the track beam boss 204 are installed, they are in a corresponding upper and lower position.

[0037] The lengths of the precast track beams 2 and precast base beams 4 in this embodiment are determined by comprehensively considering hoisting, transportation, construction efficiency, and adaptability to line conditions. Comparative calculations recommend the preferred lengths of 3.5m long precast track beams 2 and 10.7m long precast base beams 4 in this embodiment. These lengths are suitable for horizontal curves with a minimum radius of 200m and vertical curves with a minimum radius of 800m, making them more adaptable to diverse and complex line shapes and enhancing the adaptability of the present invention.

[0038] In this embodiment, the prefabricated track beam 2 and the prefabricated base beam 4 are prefabricated structures, and the cast-in-place connection part 3 is constructed by cast-in-place. The overall prefabricated structure accounts for no less than 75%, which improves the assembly rate, reduces the workload of on-site pouring, reduces the amount of concrete masonry, improves construction efficiency, reduces on-site labor, and reduces construction costs.

[0039] The width and length of the base beam groove 403 are both greater than those of the track beam boss 204. The upper surface area of ​​the base beam groove 403 is greater than the bottom area of ​​the track beam boss 204. The base beam groove 403 and the track beam boss 204 are mortise-jointed. During on-site casting, 52% to 63% of the lower end of the track beam boss 204 is cast within the base beam groove 403. During installation of the prefabricated track beam 2 and the prefabricated base beam 4, the horizontal adjustment of the prefabricated track beam 2 is no less than 40 mm, and the vertical adjustment of the prefabricated track beam 2 is no less than 30 mm, providing greater flexibility in construction errors and line adaptability.

[0040] Specifically, the base beam longitudinal beam 401 is provided with dotted base beam grooves 403 at intervals, corresponding in vertical position to the track beam bosses 204. The base beam grooves 403 are larger than the track beam bosses 204. This allows for rough and fine adjustments of the prefabricated track beam 2 after the prefabricated base beam 4 is constructed, allowing for no less than 40mm of adjustment in both the front and rear directions. The track beam bosses 204 are cast in-situ within the base beam grooves 403, ensuring structural stability and enabling no less than 30mm of vertical adjustment of the prefabricated track beam 2.

[0041] Among them, the interior of the base beam groove 403 described in this embodiment is roughened to enhance the surface roughness, which works together with the reserved connecting steel bars to further strengthen the connection strength between the prefabricated base beam 4 and the cast-in-place connection part 3.

[0042] Based on the content of this example, it can be seen that the present invention realizes the common optimization and unification of direct load-bearing conversion of the track, track support and accuracy, and complex linear adaptability through the integrated prefabricated prefabricated track beam 2 and prefabricated base beam 4 and their corresponding matched track beam bosses 204 and base beam grooves 403. On the one hand, the integrated prefabricated prefabricated track beam 2 and prefabricated base beam 4 first ensure the overall accuracy of the structure, so that when the prefabricated track beam 2 carries the rail 1, each support point (i.e., the track beam support platform 203) can accurately bear the load, avoiding the unevenness of the rail caused by unevenness due to construction errors, thereby ensuring that the track geometry behavior of the two rails 1 under the train is at the millimeter level; on the other hand, the direct load-bearing position of the rail 1 corresponds to the track beam boss 204 and the base beam groove 403, which meets the high load-bearing and stability requirements of direct load-bearing conversion and improves the safety and stability of load-bearing; thirdly, through the track beam boss 204 and the base beam groove 403 along the track beam longitudinal beam 201 The design of a point-like distribution of the track beam 204 and the base beam longitudinal beam 401 (i.e., the track beam bosses 204 and the base beam grooves 403 are evenly distributed along the length of the track, generally with four track beam bosses 204 symmetrically arranged front and rear on a single prefabricated track beam 2, and corresponding base beam grooves 403) and the design of wrapping the track beam bosses 204 with an isolation layer 205 or a vibration-damping pad 206, and casting the lower end of the track beam bosses 204 into the base beam groove 403, increases the flexibility of the connection between the structures, reduces the structural stress damage easily caused by greater structural rigidity and direct load transfer, and enables precise fine-tuning between structures to further enhance safety and stability, while also meeting the design requirements of complex lines. Fourthly, the point-like distribution method also limits the adjustable range between the track beam bosses 204 and the base beam grooves 403 to a small extent, avoiding the unreasonable increase in structural misalignment under high loads due to excessive adjustability and excessive flexible connection parts. Fifthly, the vibration-damping pads 206 further enhance the flexible connection and vibration isolation capabilities between the structures based on the above.

[0043] Example 2:

[0044] This embodiment, based on Example 1, incorporates an isolation layer 205 wrapped around the lower end of the track beam boss 204 of the prefabricated track beam 2. Based on vibration reduction requirements, a vibration-damping pad 206 made of a vibration-damping material can be added to the interior of the isolation layer 205. This pad reduces the transmission of vehicle and rail vibration to the underlying foundation, thereby reducing the impact of wheel-rail vibration on the surrounding environment. Another application scenario involves the isolation layer 205 serving as a vibration-damping pad made of a vibration-damping material, meeting the requirements of vibration-damping construction conditions.

[0045] Example 3:

[0046] In this embodiment, based on the above embodiment, multiple prefabricated track beams 2 are arranged longitudinally with the prefabricated base beam 4. In this embodiment, three prefabricated track beams 2 are arranged on the upper portion of the prefabricated base beam 4 along the track direction. The number of prefabricated track beams 2 arranged on the prefabricated base beam 4 can be optimized based on the length of the prefabricated base beam 4 and the prefabricated track beams 2 and the spacing between adjacent prefabricated track beams 2, such as 1, 2, 3, 4, 5, etc., among which 2 to 4 can be further specifically preferred.

[0047] The track beam longitudinal beam 201, the track beam cross beam 202 and the track beam boss 204 in the prefabricated track beam 2 are connected by internal steel bars and cast into a prefabricated structure in one step, thereby ensuring stable connection between the various components of the track beam.

[0048] In addition to meeting the structural force requirements, the track beam crossbeam 202 also connects the two track beam longitudinal beams under the rails, ensuring the relative position relationship between the two track beam longitudinal beams and the stability of the frame structure, thereby ensuring that the construction accuracy of the track geometric dimensions of the rails is within the millimeter range.

[0049] The track beam boss 204 is located directly below the track beam, that is, directly below the train action position. The track beam 2 transfers the train action load to the base through the boss 204, ensuring the stability of the structure. The base beam longitudinal beam 401, the base beam cross beam 402 and the base beam groove 403 in the prefabricated base beam 4 are connected by internal steel bars and cast into a prefabricated structure in one step, ensuring the stable connection between the various components of the base beam. The base beam longitudinal beam 401, the base beam cross beam 402 and the base beam groove 403 are connected by internal steel bars to form the frame structure of the prefabricated base beam 4, thereby enhancing the bearing strength of the prefabricated base beam 4. And through the steel bar connection, the strength and bearing stability of the prefabricated base beam 4 are increased.

[0050] The track beam longitudinal beams 201, track beam transverse beams 202, and track beam bosses 204 are connected by internal reinforcement to form the prefabricated track beam framework. The prefabricated base beam 4 also features internal reinforcement connecting the base beam longitudinal beams 401, base beam transverse beams 402, and base beam recesses 403. Compared to traditional slab structures, this track beam and base beam framework features a hollowed-out center, minimizing the dimensions of each component and reducing material usage by approximately 53%. Calculations show that it can withstand upper train loads, meeting structural stress and durability requirements while also minimizing the effects of temperature on the structure's mechanical properties. This framework reduces the size and mass of the track beam and base beam, facilitating transportation, construction, and installation, saving materials, and reducing costs. Furthermore, the framework can be integrated with other ancillary facilities, such as road pavements, greening layers, and decking, broadening its adaptability to engineering conditions, enhancing environmental adaptability, and enhancing the urban landscape.

[0051] During on-site casting, a portion of the lower end of the track beam boss 204 is cast within the base beam recess 403. In this embodiment, the specifications, quantity, and location of the track beam boss 204 and base beam recess 403 are determined based on structural stresses, material properties, and calculations to adapt to rail transit alignment. The size of the base beam recess 403 is designed to accommodate vibrators during on-site casting of the connection portion 3, ensuring that the cast-in-place portion does not require formwork, ensuring simple and convenient construction.

[0052] In the above embodiment, after the track structure is positioned and installed, there are no special workability requirements for the material of the cast-in-place connection portion 3; fine stone concrete can meet these requirements. This significantly expands the application range and applicable strength of the concave-convex groove connection track structure described in this embodiment, while also reducing the unit price by 52% compared to traditional self-compacting concrete, thereby lowering the project cost. The cast-in-place connection portion 3 is cast from the top, unlike the traditional precast slab track bed, which uses sleeve grouting for the cast-in-place portion. This reduces the hidden construction process, makes the casting quality easier to control, and reduces quality and safety risks.

[0053] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A prefabricated and separable concave-convex groove connection track structure, characterized by: It comprises a prefabricated track beam (2), a prefabricated base beam (4), and a cast-in-place connecting portion (3), wherein the prefabricated track beam (2) is connected to the prefabricated base beam (4) via the cast-in-place connecting portion (3); The prefabricated track beam (2) comprises a track beam longitudinal beam (201), a track beam transverse beam (202), a track beam rail support platform (203), and a track beam convex column (204); the track beam transverse beam (202) is located between the track beam longitudinal beams (201); the track beam rail support platform (203) is installed on the track beam longitudinal beam (201); the track beam rail support platform (203) fixes the rail (1) via fasteners; the track beam convex column (204) is arranged in a dotted pattern at the lower end of the track beam longitudinal beam (201); and the lower end of the track beam convex column (204) is covered with an isolation layer (205); The prefabricated base beam (4) comprises a base beam longitudinal beam (401), a base beam transverse beam (402) and a base beam groove (403); two base beam longitudinal beams (401) are connected via two base beam transverse beams (402); the base beam grooves (403) are arranged at intervals on the base beam longitudinal beam (401); and when the base beam grooves (403) and the track beam boss (204) are installed, they are in a state of corresponding upper and lower positions; The width and length of the base beam groove (403) are both greater than the width and length of the track beam boss (204); the upper surface area of ​​the base beam groove (403) is greater than the bottom area of ​​the track beam boss (204); and the base beam groove (403) and the track beam boss (204) are mortise-jointed via the cast-in-place connection portion (3); During on-site pouring construction, a portion of the lower end of the track beam boss (204) is poured into the groove (403), and a reserved adjustment amount is provided between the track beam boss (204) and the base beam groove (403).

2. The prefabricated and separable concave-convex groove connection track structure according to claim 1, characterized in that: The prefabricated track beam (2) and the prefabricated base beam (4) are prefabricated frame structures, and the prefabricated track beam (2) and the prefabricated base beam (4) are prestressed structures.

3. The prefabricated and separable concave-convex groove connection track structure according to claim 1, characterized in that: A vibration-damping pad (206) is provided inside the isolation layer (205).

4. The prefabricated and separable concave-convex groove connection track structure according to claim 3, characterized in that: The vibration-damping pad is made of vibration-damping material.

5. The prefabricated and separable concave-convex groove connection track structure according to claim 1, characterized in that: The material of the isolation layer (205) may be an isolation material or a vibration-damping material.

6. The prefabricated and separable concave-convex groove connection track structure according to claim 1, characterized in that: The plurality of prefabricated track beams (2) and the prefabricated base beams (4) are arranged in a longitudinal arrangement.

7. The prefabricated and separable concave-convex groove connection track structure according to claim 5, characterized in that: The track beam longitudinal beam (201), the track beam transverse beam (202), and the track beam boss (204) in the prefabricated track beam (2) are connected via internal steel bars; The base beam longitudinal beam (401), the base beam transverse beam (402) and the base beam groove (403) in the prefabricated base beam (4) are connected via internal steel bars.

8. The prefabricated and separable concave-convex groove connection track structure according to claim 1, characterized in that: The prefabricated track beam (2) is 3.5 m long, and the prefabricated base beam (4) is 10.7 m long; 52% to 63% of the lower end of the track beam boss (204) is cast in the base beam groove (403); the position adjustment amount of the track beam boss (204) in the base beam groove (403) is not less than 40 mm, and the height adjustment amount of the track beam boss (204) in the base beam groove (403) is not less than 30 mm; at least two groups of track beam bosses (204) are symmetrically arranged on each prefabricated track beam (2) along the direction of the track beam longitudinal beam (201), and the distance between the two groups is 3 / 5 of the length of the prefabricated track beam (2).

Images