Prefabricated frame track beam with connecting bosses

Abstract

The present invention discloses a prefabricated frame type track beam with connecting bosses, including a track beam longitudinal beam, a track beam transverse beam, a track beam rail support and a track beam boss. The track beam rail support is installed on the upper surface of the track beam longitudinal beam, and the track beam boss is installed on the lower surface of the track beam longitudinal beam. Connecting steel bars can be pre-buried under the track beam boss, or an isolation layer can be wrapped. The track beam longitudinal beam, track beam transverse beam and track beam rail support described in this technical solution form a prefabricated frame structure, which reduces the production cost. The track beam longitudinal beam is a prestressed structure, which can effectively reduce the cross-sectional size of the structure, prevent the track beam from cracking, and reduce the impact of temperature changes on the beam deflection. The boss is cast into the base under the beam to ensure the limited stability of the track beam. By setting an isolation layer of different materials or adding a vibration-damping pad under the boss, it can be used in areas without vibration damping or areas with different vibration damping requirements, reducing the types of track structures and facilitating the adjustment of the vibration damping 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 frame type track beam with connecting bosses. Background Art

[0002] Ballastless track is the primary track structure used in rail transit. Its function is to directly bear the load from trains and transmit the load to the roadbed, bridges, or tunnel structures. Ballastless track can be divided into cast-in-place track and precast track.

[0003] Currently, prefabricated track beams and slabs in my country primarily include CRTS I, CRTS II, and CRTS III slabs, as well as various types of urban rail prefabricated beams and slabs derived from these, trapezoidal sleepers, and other prefabricated vibration-damping track slabs. Currently, prefabricated track slabs are the primary choice. Current slab track is bulky and heavy, making it economical and inconvenient to construct and replace. Temperature fluctuations can easily cause slab warping and damage to the connecting layer, and the amount of cast-in-place engineering required is significant. Existing prefabricated frame-type track beams have complex positioning and structural forces, resulting in unstable connections to the base and prone to separation, leading to voids under the beams and compromising operational safety. Furthermore, current prefabricated beams and slabs connect to the base through a cast-in-place connection layer beneath the slab or beam. This places high demands on the workability of the cast-in-place material for the connection layer, increasing costs and complicating the construction process. Current prefabricated track beams and slabs have a wide variety of beam sizes to accommodate rail transit lines, increasing their costs and hindering construction and maintenance. Summary of the Invention

[0004] The present invention provides a prefabricated frame track beam with connecting bosses. By arranging track beam longitudinal beams, track beam crossbeams, track beam rail supports, and track beam bosses, and providing an isolation layer or reserved connecting steel bars at the lower ends of the track beam bosses, the track beam longitudinal beams and the track beam crossbeams adopt a prefabricated frame structure. This can reduce the dimensions of various parts of the track beam longitudinal beams and track beam crossbeams while retaining effective structural force and durability, thereby reducing the volume of the entire prefabricated frame structure, facilitating transportation, construction, and installation, saving materials, and reducing on-site construction labor costs. This solves technical problems existing in the prior art, such as the large volume and weight of prefabricated track slabs, poor economic efficiency, and inconvenient construction and replacement; temperature changes easily causing slab warping and damage to the connecting layer; and the large amount of cast-in-place engineering work. Furthermore, a vibration-damping pad layer or additional vibration-damping pad can be provided under the bosses to meet different vibration reduction requirements and vibration-damping track structure types, facilitating adjustment of the vibration reduction level during operation.

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

[0006] A prefabricated frame-type track beam with connecting bosses, comprising a track beam longitudinal beam, a track beam crossbeam, a track beam rail support platform and a track beam boss, wherein the track beam crossbeam is installed on two parallel track beam longitudinal beams, and the number of the track beam crossbeams installed between the track beam longitudinal beams is greater than or equal to two; the track beam rail support platform is installed on the upper surface of the track beam longitudinal beam, and the track beam boss is installed on the lower surface of the track beam longitudinal beam.

[0007] Optionally, the lower end of the track beam boss is covered with an isolation layer, and a vibration-damping pad may be added inside the isolation layer according to vibration reduction requirements.

[0008] Optionally, the material of the isolation layer at the lower end of the track beam boss may be a common isolation material or a vibration-damping material.

[0009] Optionally, the lower surface of the track beam boss may be pre-embedded with track beam reserved connecting steel bars; the track beam reserved connecting steel bars are distributed in multiple rows in parallel perpendicular to the direction of the track beam longitudinal beam.

[0010] Optionally, the reserved connecting steel bars of the track beam are gate-shaped steel bars, and the openings of the gate-shaped steel bars are along the line direction.

[0011] Optionally, the track beam longitudinal beam is cast on site on the lower base through the track beam boss.

[0012] Optionally, the track beam bosses are distributed in a point-like manner.

[0013] Optionally, the track beam longitudinal beams are prestressed structural members, and the track beam cross beams are installed between the track beam longitudinal beams that are arranged in parallel, and the track beam cross beams are distributed in parallel.

[0014] Optionally, the track beam longitudinal beam, the track beam transverse beam, the track beam rail support platform and the track beam boss are prefabricated into an integrated structure, and a steel rail is installed on the track beam rail support platform.

[0015] Preferably, the length of the track beam longitudinal beam is 3.5m; the track beam bosses are symmetrically arranged in at least two groups along the track beam longitudinal beam direction, and the interval between the two groups is 3 / 5 of the track beam longitudinal beam.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0017] 1) The track beam longitudinal beam, track beam cross beam, and track beam support platform described in this technical solution form a prefabricated frame structure, which reduces the volume and specifications of the prefabricated track beam, facilitates construction and subsequent maintenance, reduces production costs, and reduces the amount of masonry work on the concrete structure. In addition, the track beam longitudinal beam is a prestressed structure, which can effectively reduce the cross-sectional size of the structure, prevent the track beam from cracking, and reduce the impact of temperature changes on beam deflection.

[0018] 2) By setting a track beam boss under the track beam and casting the track beam boss on site on the base under the track beam, the connection between the track beam and the base is ensured to be stable, and the track beam boss ensures the three-way limit stability of the track beam.

[0019] 3) By setting an isolation layer under the convex column of the track beam and adding vibration-damping pads inside the isolation layer or using different vibration-damping materials in the isolation layer, it 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 the vibration-damping level 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.

[0020] 4) In this technical solution, the track beam boss itself has a certain height, which can realize the height adjustment of the track beam and improve the adaptability of the track structure to uneven foundation settlement. In addition, the specifications of the track beam and the track beam boss are small, which can realize horizontal adjustment, and is convenient for construction and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the track beam reserved connection steel bar structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure with an isolation layer of the present invention;

[0023] Figure 3 yes Figure 1 A cross-sectional schematic diagram of

[0024] Figure 4 yes Figure 2 A cross-sectional schematic diagram of

[0025] Figure 5 This is a partial schematic diagram of adding a vibration-damping pad under the track beam convex column in the present invention;

[0026] Figure 6 yes Figure 1 Schematic diagram of the local structure of the middle track beam protrusion;

[0027] Figure 7 yes Figure 2 Schematic diagram of the local structure of the middle track beam protrusion;

[0028] Figure 8 This is a reference diagram of the state of the prefabricated frame track beam of the present invention when it is specifically applied; A and B respectively represent two structural types of states with an isolation layer below the convex column and reserved connecting steel bars for the track beam.

[0029] Among them: 1-track beam longitudinal beam, 2-track beam cross beam, 3-track beam track support platform, 4-track beam protrusion, 5-track beam reserved connecting steel bars, 6-isolation layer, 7-vibration damping pad, 8-rail. DETAILED DESCRIPTION

[0030] 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 with reference to 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.

[0031] Example 1:

[0032] like Figure 1-Figure 7 As shown, a prefabricated frame-type track beam with connecting bosses includes a track beam longitudinal beam 1, a track beam crossbeam 2, a track beam rail support 3 and a track beam boss 4. The track beam crossbeam 2 is installed on two parallel track beam longitudinal beams 1, and the number of the track beam crossbeams 2 installed between the track beam longitudinal beams 1 is greater than or equal to two; the track beam rail support 3 is installed on the upper surface of the track beam longitudinal beam 1, and the track beam boss 4 is installed on the lower surface of the track beam longitudinal beam 1.

[0033] The track beam longitudinal beam 1, track beam cross beam 2, track beam support 3, and track beam boss 4 are prefabricated as an integrated structure. Rails 8 are mounted on the track beam support 3. Train loads are transmitted via the rails to the track beam, which in turn transmits them to the lower structure via the boss 4. This results in a simple structure and clear force distribution.

[0034] In this embodiment, the track beam longitudinal beams 1 are prestressed, effectively reducing the cross-sectional dimensions of the structure, preventing cracking of the track beam, and mitigating the effects of temperature changes on beam deflection. Track beam cross beams 2 are disposed between the track beam longitudinal beams 1. The track beam longitudinal beams 1 are disposed parallel to each other, and the track beam cross beams 2 installed between the track beam cross beams 2 are also disposed parallel to each other. Therefore, the track beam longitudinal beams 1 and the track beam cross beams 2 form a prefabricated frame structure. While maintaining effective structural stress and durability, the dimensions of the longitudinal beams and cross beams are minimized to reduce the volume of the track beam, facilitate transportation, construction, and installation, conserve materials, reduce on-site construction labor, and lower costs.

[0035] In addition to bearing the train load, the track beam crossbeam 2 also maintains the spacing between the two track beam longitudinal beams 2, ensuring the construction error of the track beam longitudinal beam 2, and further ensuring that the construction error of the two rails 8 on the track beam longitudinal beam 2 is at the millimeter level, thereby improving the running smoothness of the train.

[0036] The track beam is located below the track beam longitudinal beam 2 via the track beam boss 4, directly transferring the train load from the upper rail 8 to the lower structure. The track beam boss 4 is cast on-site on the lower base, connecting the track beam to the lower base. The provision of the track beam boss 4 can simultaneously achieve positional stability for the track beam longitudinal beam 1 and the track beam crossbeam 2. The track beam boss 4 is distributed in a point-like manner and has a certain height, resulting in a small connection area and a reliable structure. The material requirements for the cast-in-place connection are lower than those for the post-cast connection of traditional prefabricated track slabs. Ordinary concrete or fine stone concrete can meet the requirements, reducing costs and simplifying the construction process.

[0037] The number and location of the rail beam bosses 4 under each rail beam are based on a comprehensive consideration of mechanical calculations, material properties, and connection convenience. Positioning the bosses 4 at the ends of the longitudinal beams 2 increases the span and mid-span bending moment, hindering structural stress. Furthermore, the projected adaptability to small-radius curves increases, requiring more concrete to be poured at the connection, and thus increasing costs. Optimally, positioning the bosses 4 approximately 1 / 5 of the way up the longitudinal beam maximizes the material's bending resistance, resulting in better stress tolerance on the track slab and less curve adjustment, thus increasing the track's adaptability.

[0038] The length of the track beam in this embodiment is determined by comprehensively considering hoisting, transportation, construction efficiency, and adaptability to line conditions. Comparative calculations recommend a 3.5m long track beam in this embodiment, which is suitable for horizontal curves with a minimum curve radius of 200m and vertical curves with a minimum curve radius of 800m. This makes it more adaptable to various complex line shapes, improving the adaptability of the present invention and reducing the number of specifications.

[0039] Example 2:

[0040] like Figure 2 、 4 As shown in , 5 and 7, this embodiment is further limited on the basis of embodiment 1, and an isolation layer 6 can be provided at the lower part of the track beam boss 4. The material of the isolation layer can be ordinary isolation material or vibration-damping material, and can be provided according to engineering needs.

[0041] The provision of the isolation layer 6 facilitates the replacement of the track beams and also facilitates maintenance and repair.

[0042] Optionally, the lower end of the track beam boss 4 is covered with an isolation layer 6 , and a vibration-damping pad 7 may be added inside the isolation layer 6 .

[0043] Specifically, when the track beam does not need vibration reduction, an isolation layer 6 is coated on the lower end of the track beam boss 4. Furthermore, when vibration reduction is required under the track beam, a vibration reduction pad 7 can be added to the isolation layer 6, and the vibration reduction pad is made of vibration reduction material.

[0044] If there is a need for vibration reduction under the track beam, the isolation layer 6 can be directly selected as the vibration reduction material.

[0045] The provision of the isolation layer 6 and the vibration-damping pad 7 can ensure that the track beam is suitable for areas with different vibration-damping requirements, thereby improving the applicability of the track beam and reducing the types of track beams, thereby facilitating construction and maintenance.

[0046] Example 3:

[0047] like Figure 1 、 3 As shown in , 6, this embodiment is further defined on the basis of embodiment 1, in that the lower surface of the track beam boss 4 is installed with a track beam reserved connection steel bar 5. The track beam reserved connection steel bar 5 is embedded in the lower end of the track beam boss 4, and the track beam reserved connection steel bar 5 is distributed in multiple rows in parallel perpendicular to the direction of the track beam longitudinal beam 1, which can increase the torsional resistance during structural connection. The track beam reserved connection steel bar 5 is a gate-shaped steel bar, and the opening of the gate-shaped steel bar is along the line direction. The track beam longitudinal beam 1 is cast on site on the lower base through the track beam boss 4 and is connected to the lower base as a whole to improve the stability of the connection.

[0048] Specifically, the track beam's reserved connecting reinforcement bars 5 are gate-shaped, with their openings oriented along the track. This ensures a secure connection between the reserved connecting reinforcement bars and the lower connecting reinforcement bars, and allows for easy positioning during track beam construction. Furthermore, the track beam's reserved connecting reinforcement bars 5 can be directly mounted on the underside of the track beam's bosses 4. To enhance the reliability of the connection between the track beam and the cast-in-place connection, the underside of the track beam bosses 4 can be roughened to increase surface roughness.

[0049] Example 4:

[0050] The prefabricated frame track beam described in this embodiment fully utilizes the mechanical properties of materials, resulting in a compact and lightweight structure. This reduces material consumption by approximately 46%, lowering the cost of the structure. This also reduces the impact of temperature on the internal forces of the structure, improving the track beam's applicability. Calculations show that the beam is suitable for use in warm, cold, and extremely cold regions.

[0051] The prefabricated frame track beam described in this embodiment can be equipped with auxiliary facilities, such as road pavement, green layer, cover plate, etc., to broaden the applicability of engineering conditions, have strong adaptability to the environment, and enhance the urban landscape.

[0052] From the content of each embodiment, it can be seen that the present invention can realize the mutual cooperation with the base beam with corresponding structure below through the integrated prefabricated frame rail beam (such as Figure 8), thereby achieving the common optimization and unification of direct track load conversion, track support and accuracy, and adaptability to complex linear shapes. On the one hand, the integrated prefabricated frame track beam first ensures the overall accuracy of the structure, so that when it carries the rails 8, each support point (i.e., the track beam support platform 3) can accurately bear the load, avoiding uneven rails caused by uneven construction errors, thereby ensuring that the track geometry of the two rails 1 under the train is at the millimeter level; on the other hand, the rails 8 correspond to the direct load-bearing positions of the track beam bosses 4, meeting the high load-bearing and stability requirements of direct force conversion, and improving the safety and stability of load-bearing; thirdly, the point-like distribution method also limits the adjustable range of the corresponding cooperation between the track beam bosses 4 and the grooves of the lower base beam to a small extent, avoiding the unreasonable increase of structural dislocation under high load due to excessive adjustable amount; fourthly, the vibration-damping pads 7 further improve the flexible connection capacity and vibration isolation performance between structures on the basis of the above. Fifthly, the track beam reserved connecting steel bars 5 are further optimized as the track beam boss 4, which improves the connection strength when corresponding to the grooves corresponding to the base beam below, improves the structural anti-dislocation ability of the structure under high load, and can properly release the internal stress through the elastic strain capacity of the steel bars, thereby optimizing the structural safety capability; sixthly, the track beam reserved connecting steel bars 5 are distributed in multiple rows in parallel, which can realize the cross-arrangement of parallel steel bars in the grooves corresponding to the base beam below in rows, which not only improves the connection strength when the two are matched and connected, but also further improves the structural anti-dislocation ability through the staggered steel bars.

[0053] The specific implementation methods described above further illustrate the purpose of the present invention - the technical solution and the beneficial effects 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 frame track beam with connecting bosses, characterized in that: The invention comprises a track beam longitudinal beam (1), a track beam cross beam (2), a track beam rail support platform (3) and a track beam convex column (4), wherein the track beam cross beam (2) is installed on two track beam longitudinal beams (1) arranged in parallel, and the number of the track beam cross beams (2) installed between the track beam longitudinal beams (1) is greater than or equal to two; the track beam rail support platform (3) is installed on the upper surface of the track beam longitudinal beam (1), and the track beam convex column (4) is installed on the lower surface of the track beam longitudinal beam (1); The lower surface of the track beam boss (4) is pre-embedded with track beam reserved connection steel bars (5); the track beam reserved connection steel bars (5) are arranged in parallel in multiple rows perpendicular to the direction of the track beam longitudinal beam (1); The track beam longitudinal beam (1) is cast on site on the lower base through the track beam boss (4).

2. The prefabricated frame track beam with connecting bosses according to claim 1, characterized in that: The track beam reserved connection steel bars (5) are gate-shaped steel bars, and the opening of the gate-shaped steel bars is along the track direction.

3. The prefabricated frame track beam with connecting bosses according to claim 1, characterized in that: The track beam bosses (4) are distributed in a point-like manner.

4. The prefabricated frame track beam with connecting bosses according to claim 1, characterized in that: The track beam longitudinal beams (1) are prestressed structural members, and the track beam cross beams (2) are installed between the track beam longitudinal beams (1) arranged in parallel, and the track beam cross beams (2) are distributed in parallel.

5. The prefabricated frame track beam with connecting bosses according to claim 1, characterized in that: The track beam longitudinal beam (1), the track beam cross beam (2), the track beam rail support platform (3) and the track beam boss (4) are prefabricated into an integrated structure, and a steel rail (8) is installed on the track beam rail support platform (3).

6. The prefabricated frame track beam with connecting bosses according to claim 1, characterized in that: The track beam longitudinal beam (1) is 3.5 m long; at least two groups of track beam bosses (4) are symmetrically arranged along the direction of the track beam longitudinal beam (1), and the distance between the two groups is 3 / 5 of the length of the track beam longitudinal beam (1).

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