Large-span cable bridge ballastless track, track system and construction method

Abstract

The invention relates to a long-span cable bridge ballastless track, a track system and a construction method, the long-span cable bridge ballastless track comprises a concrete base, the concrete base is provided with a prefabricated longitudinal sleeper slab, the prefabricated longitudinal sleeper slab comprises two prestressed longitudinal beams, the two prestressed longitudinal beams are arranged in parallel, and anti-vibration pads are clamped between the two prestressed longitudinal beams and the concrete base; a plurality of transverse concrete connecting blocks are arranged between the two prestressed longitudinal beams, located at the two ends of the prestressed longitudinal beams and used for connecting the two ends of the two prestressed longitudinal beams. The transverse concrete connecting blocks are arranged at the two ends of the prefabricated longitudinal sleeper slab, the transverse concrete connecting blocks play a weight effect, the vertical upward tension of the anti-vibration pad is eliminated, and the problems that in the related technology, the anti-vibration pad of a large-span bridge can generate local tension under the action of various loads and elastic fulcrum counterforce, consequently, the anti-vibration pad is in a disengagement state, and the anti-vibration effect is affected are solved. The smoothness of the ballastless track and the driving safety are influenced.

Description

Technical Field

[0001] The present application relates to the field of rail transit technology, and in particular to a ballastless track of a large-span cable bridge, a track system and a construction method. Background Art

[0002] With the development of railways, large-span cable bridges are increasingly used. Since the ballast track has a ballast roadbed, the secondary constant load on the bridge will be large and maintenance is frequent. Ballasted track is suitable for ordinary trains. Ballastless track is suitable for high-speed trains because it uses concrete structure with good stability, long service life and less maintenance.

[0003] In the related technology, a large-span cable bridge generally adopts a steel box girder as the bridge body, and a ballastless track is laid on the steel box girder. Since the ballastless track is a concrete structure, it puts forward higher requirements on the structural stiffness, track deformation, dynamic performance, etc. of the bridge. The ballastless track operates well when used in bridges with smaller spans, such as 200 to 400 meters. However, when used in longer large-span cable bridges, such as those with a main span of more than 600 meters, the longitudinal sleeper vibration damping pad will experience local tension under the action of various loads and the reaction force of the elastic fulcrum, causing the longitudinal sleeper vibration damping pad to become empty, affecting the smoothness of the ballastless track and driving safety.

[0004] Therefore, it is necessary to design a new ballastless track for large-span cable bridges to overcome the above problems. Summary of the invention

[0005] The present application provides a ballastless track, a track system and a construction method for a large-span cable bridge, which can solve the technical problem in the related art that when the ballastless track is applied to a large-span cable bridge, the longitudinal sleeper vibration damping pad will experience local tension under the action of various loads and the reaction force of the elastic fulcrum, causing the longitudinal sleeper vibration damping pad to become empty, thereby affecting the smoothness of the ballastless track and driving safety.

[0006] In a first aspect, an embodiment of the present application provides a ballastless track for a large-span cable bridge, comprising: a concrete base, on which a prefabricated longitudinal sleeper plate is installed, the prefabricated longitudinal sleeper plate comprises two prestressed longitudinal beams, the two prestressed longitudinal beams are arranged in parallel, a vibration-damping pad is sandwiched between the two prestressed longitudinal beams and the concrete base, a plurality of transverse concrete connecting blocks are arranged between the two prestressed longitudinal beams, the plurality of transverse concrete connecting blocks are located at both ends of the prestressed longitudinal beams, and the plurality of transverse concrete connecting blocks connect the two ends of the two prestressed longitudinal beams.

[0007] Among them, when the main span of a large-span cable bridge reaches more than 600m, due to the poor rigidity of the large-span cable bridge itself, when two opposite trains pass through the bridge tower, mid-span, beam end and one-quarter of the main tower at the same time, the longitudinal sleeper will be twisted and deformed under the action of dynamic load, and the bridge deck will have a local arch, resulting in insufficient pressure at the end of the longitudinal sleeper. Under the action of various loads and the reaction force of the elastic fulcrum, the vibration-damping pad between the longitudinal sleeper and the concrete base will have a local vertical upward tension, resulting in the vibration-damping pad being emptied. The higher the train speed, the greater the axle weight, the greater the deflection-span ratio of the bridge, and the more obvious the vacancy phenomenon. Demonstratively, the vertical upward tension is 0.46kN, and the two prestressed longitudinal beams are used to connect with the rails. The two prestressed longitudinal beams are flexibly connected to the concrete base through the vibration-damping pads, and the vertical upward pulling force borne by the two prestressed longitudinal beams is transmitted to the concrete base. The plurality of transverse concrete connecting blocks are integrally cast and formed with the two prestressed longitudinal beams, which can limit the two prestressed longitudinal beams and improve the overall stability of the prefabricated longitudinal sleeper slabs. The plurality of transverse concrete connecting blocks are arranged at both ends of the prestressed longitudinal beams, and the plurality of transverse concrete connecting blocks play a weighting role, eliminating the vertical upward pulling force of the vibration-damping pads, ensuring that the vertical upward pulling force is restored to 0kN, avoiding the vibration-damping pads from being empty, and ensuring driving safety.

[0008] In combination with the first aspect, in one implementation, a weight-bearing protrusion is provided at the bottom of each of the transverse concrete connecting blocks, and the weight-bearing protrusion protrudes into the concrete base.

[0009] Among them, the weight-bearing protrusion and the transverse concrete connecting block are integrally cast and formed, and the weight-bearing protrusion has a weight-bearing function, so that the two ends of the prefabricated longitudinal sleeper plate are under pressure, and the weight-bearing protrusion protrudes into the concrete base, which can stabilize the relative positions of the two prestressed longitudinal beams and the concrete base, and the weight-bearing protrusion plays a limiting role. At the same time, the friction between the weight-bearing protrusion and the side of the concrete base can offset part of the local tensile stress of the prefabricated longitudinal sleeper plate, thereby ensuring the smoothness of the ballastless track of the large-span cable bridge.

[0010] In combination with the first aspect, in one implementation, the weight-bearing protrusion is attached to the concrete base via a buffer pad.

[0011] Among them, the buffer pad is arranged between the weight-bearing protrusion and the concrete base, so that the weight-bearing protrusion and the concrete base are flexibly connected to adapt to the needs of track deformation and improve the stability of the ballastless track of the large-span cable bridge. The stiffness and number of the buffer pad located on one side of the weight-bearing protrusion are adjusted according to the stress state of the ballastless track of the large-span cable bridge.

[0012] In combination with the first aspect, in one embodiment, the width of the weight-bearing protrusion along the transverse direction of the bridge is smaller than the width of the transverse concrete connecting block along the transverse direction of the bridge.

[0013] Among them, the thickness and width of the transverse concrete connecting block can be set according to the magnitude of the local tensile stress to offset the local tensile stress at the end of the prefabricated longitudinal sleeper plate. The width of the transverse concrete connecting block along the transverse direction of the bridge is equal to the distance between the two prestressed longitudinal beams. Exemplarily, the width of the transverse concrete connecting block along the transverse direction of the bridge is set to 0.75m, the length of the transverse concrete connecting block along the longitudinal direction of the bridge is set to 0.91m, the thickness of the transverse concrete connecting block is set to 0.2m, the width of the weight protrusion along the transverse direction of the bridge is set to 0.475m, the length of the weight protrusion along the longitudinal direction of the bridge is set to 0.815m, and the thickness of the weight protrusion is set to 0.35m.

[0014] In combination with the first aspect, in one embodiment, each of the weight-bearing protrusions is configured as a rectangular parallelepiped, and each of the four corners of the weight-bearing protrusion is provided with chamfers.

[0015] Among them, the weight-bearing protrusion can be set as a rectangular parallelepiped, and the weight-bearing protrusion supports the transverse concrete connecting block, and at the same time limits the two prestressed longitudinal beams and the concrete base. The chamfers are set at the four corners of each weight-bearing protrusion to prevent the prefabricated longitudinal sleeper plate from losing corners when being installed on the concrete base.

[0016] In combination with the first aspect, in one implementation, the length of the prefabricated longitudinal sleeper slab along the longitudinal direction of the bridge is set to 4-5 m, and the spacing between two adjacent prefabricated longitudinal sleeper slabs is set to 0.1-0.3 m.

[0017] Among them, the length of the prefabricated longitudinal sleeper plate along the longitudinal direction of the bridge can be set to 4 to 5m. Preferably, the length of the prefabricated longitudinal sleeper plate along the longitudinal direction of the bridge is set to 4.6m. A plurality of the prefabricated longitudinal sleeper plates are arranged at intervals along the extension direction of the prestressed longitudinal beam to form a rail mounting position. The spacing between two adjacent prefabricated longitudinal sleeper plates can be set to 0.1 to 0.3m. Preferably, the spacing between two adjacent prefabricated longitudinal sleeper plates is set to 0.2m, so as to eliminate the stress generated by the steel bridge on the concrete base and reserve space for anti-corrosion operations on the steel bridge deck.

[0018] In combination with the first aspect, in one implementation, the concrete base is configured to be in a plate shape.

[0019] Among them, compared with the concrete base being set as a trough, the concrete base is set as a plate, which can reduce the amount of concrete used in the concrete base, reduce the bridge load, and reduce the construction cost of the bridge.

[0020] In the second aspect, an embodiment of the present application provides a track system for a large-span cable bridge, which includes: a steel box girder and a concrete base, wherein the concrete base is fixed to the steel box girder, and the concrete base is installed with a prefabricated longitudinal sleeper plate, and the prefabricated longitudinal sleeper plate includes two prestressed longitudinal beams, the two prestressed longitudinal beams are arranged in parallel, and a vibration-damping pad is sandwiched between the two prestressed longitudinal beams and the concrete base, and a plurality of transverse concrete connecting blocks are arranged between the two prestressed longitudinal beams, and the plurality of transverse concrete connecting blocks are located at both ends of the prestressed longitudinal beams, and the plurality of transverse concrete connecting blocks connect the two ends of the two prestressed longitudinal beams.

[0021] Among them, the concrete base can be connected to the steel box girder through shear nails, the concrete base is rigidly connected to the steel box girder, and the load of the prestressed longitudinal beam is transmitted to the surface of the steel box girder. The two prestressed longitudinal beams are used to connect with the rails. The two prestressed longitudinal beams are flexibly connected to the concrete base through the vibration damping pads, and the vertical pressure borne by the two prestressed longitudinal beams is transmitted to the concrete base. The multiple transverse concrete connecting blocks are integrally cast with the two prestressed longitudinal beams, which can limit the two prestressed longitudinal beams and improve the overall stability of the prefabricated longitudinal sleeper plate. The multiple transverse concrete connecting blocks are arranged at both ends of the prestressed longitudinal beam. The multiple transverse concrete connecting blocks play a weight-bearing role and eliminate the vertical upward pulling force of the vibration damping pad.

[0022] In a third aspect, an embodiment of the present application provides a method for constructing a ballastless track of a large-span cable bridge, which comprises the following steps:

[0023] S1: Cast a concrete base on the steel bridge deck and fix the concrete base to the steel bridge deck, wherein the concrete base is reserved with multiple grooves and multiple mortar grooves.

[0024] Among them, the concrete base is fixed to the steel bridge deck through the shear nails, the groove is reserved at the position of the concrete base corresponding to the weight-bearing block, and the seat mortar groove is reserved at the position of the concrete base corresponding to the vibration-damping pad. The large-span cable bridge has low stiffness and a large deformation due to the constant load of the steel bridge deck. Casting the concrete base first is conducive to stabilizing the deformation of the bridge.

[0025] S2: Laying prefabricated longitudinal sleeper plates and rails on a concrete base and performing fine adjustment and positioning, wherein a plurality of vibration-damping pads are fixed at the bottom of the prefabricated longitudinal sleeper plates.

[0026] Among them, the weight-bearing protrusion, the transverse concrete connecting block and the two prestressed longitudinal beams are integrally cast to form the prefabricated longitudinal sleeper plate, the weight-bearing protrusion is located below the transverse concrete connecting block, and the transverse concrete connecting blocks are arranged at both ends of the prefabricated longitudinal sleeper plate. A plurality of the prefabricated longitudinal sleeper plates are spaced apart along the longitudinal bridge direction to form a prefabricated longitudinal track row, wherein a plurality of vibration-damping pads are bonded to the bottom of the prefabricated longitudinal sleeper plate, and rails are installed on the prefabricated longitudinal track row.

[0027] S3: Cast a mortar groove at the bottom of the prefabricated longitudinal sleeper slab so that the concrete base is supported on multiple vibration damping pads.

[0028] Among them, the post-erection of the longitudinal rails and post-grouting through the reserved grouting grooves can achieve fine-tuning and positioning of the ballastless track, reduce the amount of post-poured concrete, and reduce the track linear error caused by bridge deformation due to excessive load.

[0029] In combination with the second aspect, in one embodiment, before laying the prefabricated longitudinal sleeper plate on the concrete base, the step further includes: fixing a buffer pad around and at the bottom of the weight-bearing protrusion.

[0030] Among them, multiple buffer pads are pasted at the position corresponding to the weight-bearing protrusion between the two prestressed longitudinal beams, and multiple buffer pads are pasted around the weight-bearing protrusion located on each prefabricated longitudinal sleeper plate, so that the weight-bearing protrusion is flexibly connected to the concrete base.

[0031] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0032] By arranging transverse concrete connecting blocks at both ends of the prefabricated longitudinal sleeper slabs, and the transverse concrete connecting blocks are installed between two prestressed longitudinal beams, the transverse concrete connecting blocks play a weight-bearing role, eliminating the vertical upward pulling force of the vibration damping pad, and solving the technical problem in the related technology that when the ballastless track is applied to a large-span cable bridge, the longitudinal sleeper vibration damping pad will have local pulling force under the action of various loads and the reaction force of the elastic fulcrum, causing the longitudinal sleeper vibration damping pad to become empty, thereby affecting the smoothness of the ballastless track and driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A front view of a ballastless track for a long-span cable bridge provided in an embodiment of the present application;

[0035] Figure 2 for Figure 1 Sectional view of AA in the middle;

[0036] Figure 3 for Figure 1 Cross-sectional view of the middle BB;

[0037] Figure 4 for Figure 1 Cross-sectional view of CC;

[0038] Figure 5 An exploded view of a ballastless track for a long-span cable bridge provided in an embodiment of the present application.

[0039] In the figure: 1. concrete base; 2. prefabricated longitudinal sleeper plate; 21. prestressed longitudinal beam; 22. transverse concrete connecting block; 23. weight-bearing convex block; 24. buffer pad; 3. vibration-damping pad. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The embodiments of the present application provide a ballastless track, a track system and a construction method for a large-span cable bridge, which can solve the technical problem that when the ballastless track is applied to a large-span cable bridge, the longitudinal sleeper vibration damping pad will experience local tension under the action of various loads and the reaction force of the elastic fulcrum, causing the longitudinal sleeper vibration damping pad to become empty, thereby affecting the smoothness of the ballastless track and driving safety.

[0042] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a ballastless track for a long-span cable bridge, which includes: a concrete base 1, on which a prefabricated longitudinal sleeper plate 2 is installed, and the prefabricated longitudinal sleeper plate 2 includes two prestressed longitudinal beams 21, the two prestressed longitudinal beams 21 are arranged in parallel, and a vibration-damping pad 3 is sandwiched between the two prestressed longitudinal beams 21 and the concrete base 1, and a plurality of transverse concrete connecting blocks 22 are arranged between the two prestressed longitudinal beams 21, and the plurality of transverse concrete connecting blocks 22 are located at both ends of the prestressed longitudinal beams 21, and the plurality of transverse concrete connecting blocks 22 connect the two ends of the two prestressed longitudinal beams 21.

[0043] In this embodiment, when the main span of the long-span cable bridge reaches more than 600m, due to the poor rigidity of the long-span cable bridge itself, when two opposite trains pass through the bridge tower, mid-span, beam end and one-quarter of the main tower at the same time, the longitudinal sleeper will be twisted and deformed under the action of dynamic load, and the bridge deck will be partially arched, resulting in insufficient pressure at the end of the longitudinal sleeper. The vibration-damping pad 3 between the longitudinal sleeper and the concrete base 1 will have a local vertical upward pulling force under the action of various loads and the reaction force of the elastic fulcrum, resulting in the vibration-damping pad 3 being emptied. The higher the train speed, the greater the axle weight, the greater the deflection-span ratio of the bridge, and the more obvious the vacancy phenomenon. By way of example, the vertical upward pulling force is 0.46kN. The two prestressed longitudinal beams 21 are used to connect with the rails. The two prestressed longitudinal beams 21 are used to connect with the rails. The stress longitudinal beam 21 is flexibly connected to the concrete base 1 through the vibration damping pad 3, and the vertical upward pulling force borne by the two prestressed longitudinal beams 21 is transmitted to the concrete base 1. The plurality of transverse concrete connecting blocks 22 are integrally cast and formed with the two prestressed longitudinal beams 21, which can limit the two prestressed longitudinal beams 21 and improve the overall stability of the prefabricated longitudinal sleeper plate 2. The plurality of transverse concrete connecting blocks 22 are arranged at both ends of the prestressed longitudinal beam 21, and the plurality of transverse concrete connecting blocks 22 play a weighting role, eliminating the vertical upward pulling force of the vibration damping pad 3, ensuring that the vertical upward pulling force is restored to 0kN, avoiding the vibration damping pad 3 from being empty, and ensuring driving safety.

[0044] In this embodiment, the transverse concrete connecting blocks 22 are arranged at both ends of the prefabricated longitudinal sleeper plate 2, and the transverse concrete connecting blocks 22 are installed between the two prestressed longitudinal beams 21. The transverse concrete connecting blocks 22 play a weight-bearing role, thereby eliminating the vertical upward pulling force of the vibration-damping pad 3. This solves the technical problem in the related art that when the ballastless track is applied to a large-span cable bridge, the longitudinal sleeper vibration-damping pad 3 will have local pulling force under the action of various loads and the reaction force of the elastic fulcrum, resulting in the longitudinal sleeper vibration-damping pad 3 being in an empty state, thereby affecting the smoothness of the ballastless track and driving safety.

[0045] Further, see Figure 1 and Figure 2 As shown, in some embodiments, a weight-bearing protrusion 23 is provided at the bottom of each of the transverse concrete connecting blocks 22 , and the weight-bearing protrusion 23 protrudes into the concrete base 1 .

[0046] In this embodiment, the weight-bearing protrusion 23 and the transverse concrete connecting block 22 are integrally cast and formed. The weight-bearing protrusion 23 has a weight-bearing function, so that the two ends of the prefabricated longitudinal sleeper plate 2 are under pressure. The weight-bearing protrusion 23 protrudes into the concrete base 1, and can stabilize the relative position of the two prestressed longitudinal beams 21 and the concrete base 1. The weight-bearing protrusion 23 plays a limiting role. At the same time, the weight-bearing protrusion 23 rubs against the side of the concrete base 1, which can offset part of the local tensile stress of the prefabricated longitudinal sleeper plate 2, thereby ensuring the smoothness of the ballastless track of the large-span cable bridge.

[0047] Further, see Figure 1 and Figure 2 As shown, in some embodiments, the weight projection 23 is attached to the concrete base 1 via a buffer pad 24 .

[0048] In this embodiment, the buffer pad 24 is arranged between the weight-bearing protrusion 23 and the concrete base 1, so that the weight-bearing protrusion 23 and the concrete base 1 are flexibly connected to adapt to the requirements of track deformation and improve the stability of the ballastless track of the large-span cable bridge. The stiffness and number of the buffer pad 24 located on one side of the weight-bearing protrusion 23 are adjusted according to the stress state of the ballastless track of the large-span cable bridge.

[0049] Further, see Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the width of the weight-bearing protrusion 23 along the transverse direction of the bridge is smaller than the width of the transverse concrete connecting block 22 along the transverse direction of the bridge.

[0050] In this embodiment, the thickness and width of the transverse concrete connecting block 22 can be set according to the magnitude of the local tensile stress to offset the local tensile stress at the end of the prefabricated longitudinal sleeper plate 2. The width of the transverse concrete connecting block 22 along the transverse direction is equal to the distance between the two prestressed longitudinal beams 21. Exemplarily, the width of the transverse concrete connecting block 22 along the transverse direction is set to 0.75m, the length of the transverse concrete connecting block 22 along the longitudinal direction is set to 0.91m, the thickness of the transverse concrete connecting block 22 is set to 0.2m, the width of the weight protrusion 23 along the transverse direction is set to 0.475m, the length of the weight protrusion 23 along the longitudinal direction is set to 0.815m, and the thickness of the weight protrusion 23 is set to 0.35m.

[0051] Further, see Figure 1 As shown, in some embodiments, each of the weight-bearing protrusions 23 is configured as a rectangular parallelepiped, and each of the four corners of the weight-bearing protrusions 23 is provided with chamfers.

[0052] In this embodiment, the weight-bearing protrusion 23 can be set as a rectangular parallelepiped. The weight-bearing protrusion 23 supports the transverse concrete connecting block 22 and simultaneously limits the two prestressed longitudinal beams 21 and the concrete base 1. The four corners of each weight-bearing protrusion 23 are set with chamfers to prevent the prefabricated longitudinal sleeper plate 2 from losing corners when being installed on the concrete base 1.

[0053] Further, see Figure 1 As shown, in some embodiments, the length of the prefabricated longitudinal sleeper slab 2 along the longitudinal direction of the bridge is set to 4-5 m, and the distance between two adjacent prefabricated longitudinal sleeper slabs 2 is set to 0.1-0.3 m.

[0054] In this embodiment, the length of the prefabricated longitudinal sleeper plate 2 along the longitudinal direction of the bridge can be set to 4 to 5 m. Preferably, the length of the prefabricated longitudinal sleeper plate 2 along the longitudinal direction of the bridge is set to 4.6 m. A plurality of the prefabricated longitudinal sleeper plates 2 are arranged at intervals along the extension direction of the prestressed longitudinal beam 21 to form a rail mounting position. The spacing between two adjacent prefabricated longitudinal sleeper plates 2 can be set to 0.1 to 0.3 m. Preferably, the spacing between two adjacent prefabricated longitudinal sleeper plates 2 is set to 0.2 m to eliminate the stress generated by the steel bridge on the concrete base 1 and reserve space for anti-corrosion operations on the steel bridge deck.

[0055] Further, see Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the concrete base 1 is configured to be in a plate shape.

[0056] In this embodiment, compared with the concrete base 1 being configured as a trough, the concrete base 1 is configured as a plate, which can reduce the amount of concrete used in the concrete base 1, reduce the bridge load, and reduce the construction cost of the bridge.

[0057] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a track system for a large-span cable bridge, which includes: a steel box girder and a concrete base 1, wherein the concrete base 1 is fixed to the steel box girder, and a prefabricated longitudinal sleeper plate 2 is installed on the concrete base 1, wherein the prefabricated longitudinal sleeper plate 2 includes two prestressed longitudinal beams 21, and the two prestressed longitudinal beams 21 are arranged in parallel, and a vibration-damping pad 3 is sandwiched between the two prestressed longitudinal beams 21 and the concrete base 1, and a plurality of transverse concrete connecting blocks 22 are arranged between the two prestressed longitudinal beams 21, and the plurality of transverse concrete connecting blocks 22 are located at both ends of the prestressed longitudinal beams 21, and the plurality of transverse concrete connecting blocks 22 connect the two ends of the two prestressed longitudinal beams 21.

[0058] In this embodiment, the concrete base 1 can be connected to the steel box girder through shear nails. The concrete base 1 is rigidly connected to the steel box girder to transmit the load of the prestressed longitudinal beam 21 to the surface of the steel box girder. The two prestressed longitudinal beams 21 are used to connect with the rails. The two prestressed longitudinal beams 21 are flexibly connected to the concrete base 1 through the vibration damping pads 3 to transmit the vertical pressure borne by the two prestressed longitudinal beams 21 to the concrete base 1. The multiple transverse concrete connecting blocks 22 are integrally cast with the two prestressed longitudinal beams 21, which can limit the two prestressed longitudinal beams 21 and improve the overall stability of the prefabricated longitudinal sleeper plate 2. The multiple transverse concrete connecting blocks 22 are arranged at both ends of the prestressed longitudinal beam 21. The multiple transverse concrete connecting blocks 22 play a weight-bearing role to eliminate the vertical upward pulling force of the vibration damping pads 3.

[0059] See also Figure 1 , Figure 2 and Figure 5 As shown, the embodiment of the present application provides a construction method for a ballastless track of a long-span cable bridge, which includes the following steps:

[0060] S1: Cast a concrete base 1 on the steel bridge deck, and fix the concrete base 1 to the steel bridge deck, wherein the concrete base 1 is reserved with a plurality of grooves and a plurality of mortar grooves.

[0061] In this embodiment, the concrete base 1 is fixed to the steel bridge deck through the shear nails, the groove is reserved at the position of the concrete base 1 corresponding to the weight-bearing protrusion 23, and the seat mortar groove is reserved at the position of the concrete base 1 corresponding to the vibration-damping pad 3. The large-span cable bridge has low stiffness and a large deformation due to the constant load of the steel bridge deck. Casting the concrete base 1 first is beneficial to stabilizing the deformation of the bridge.

[0062] S2: Laying the prefabricated longitudinal sleeper plate 2 and the rails on the concrete base 1 and fine-adjusting the positioning, wherein a plurality of vibration-damping pads 3 are fixed at the bottom of the prefabricated longitudinal sleeper plate 2.

[0063] In this embodiment, the weight-bearing protrusion 23, the transverse concrete connecting block 22 and the two prestressed longitudinal beams 21 are integrally cast and formed to form the prefabricated longitudinal sleeper plate 2, the weight-bearing protrusion 23 is located below the transverse concrete connecting block 22, and the transverse concrete connecting block 22 is arranged at both ends of the prefabricated longitudinal sleeper plate 2. A plurality of the prefabricated longitudinal sleeper plates 2 are spaced apart along the longitudinal bridge direction to form a prefabricated longitudinal track row, wherein a plurality of vibration-damping pads 3 are bonded to the bottom of the prefabricated longitudinal sleeper plate 2, and rails are installed on the prefabricated longitudinal track row.

[0064] S3: Cast a mortar groove at the bottom of the prefabricated longitudinal sleeper plate 2 so that the concrete base 1 is supported on multiple vibration-damping pads 3.

[0065] In this embodiment, the longitudinal rails are installed later and grouting is performed through the reserved grouting grooves to achieve fine adjustment and positioning of the ballastless track, reduce the amount of post-poured concrete, and reduce the track linear error caused by bridge deformation due to excessive load.

[0066] Further, see Figure 1 , Figure 2 and Figure 5 As shown, in some embodiments, before laying the prefabricated longitudinal sleeper slab 2 on the concrete base 1 , the process further includes: fixing a buffer pad 24 around and at the bottom of the weight-bearing protrusion 23 .

[0067] In this embodiment, a plurality of buffer pads 24 are pasted at positions corresponding to the weight-bearing protrusions 23 between the two prestressed longitudinal beams 21, and a plurality of buffer pads 24 are pasted around the weight-bearing protrusions 23 located on each of the prefabricated longitudinal sleeper plates 2, so that the weight-bearing protrusions 23 are flexibly connected to the concrete base 1.

[0068] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0069] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0070] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A ballastless track for a long-span cable bridge, characterized in that: It includes: A concrete base (1), wherein the concrete base (1) is installed with a prefabricated longitudinal sleeper plate (2), wherein the prefabricated longitudinal sleeper plate (2) comprises two prestressed longitudinal beams (21), wherein the two prestressed longitudinal beams (21) are arranged in parallel, wherein a vibration-damping pad (3) is sandwiched between the two prestressed longitudinal beams (21) and the concrete base (1), wherein a plurality of transverse concrete connecting blocks (22) are arranged between the two prestressed longitudinal beams (21), wherein the plurality of transverse concrete connecting blocks (22) are located at both ends of the prestressed longitudinal beams (21), and wherein the plurality of transverse concrete connecting blocks (22) connect the two ends of the two prestressed longitudinal beams (21).

2. The long-span cable bridge ballastless track according to claim 1, characterized in that: A weight-bearing protrusion (23) is provided at the bottom of each transverse concrete connecting block (22), and the weight-bearing protrusion (23) protrudes into the concrete base (1).

3. The long-span cable bridge ballastless track according to claim 2, characterized in that: The weight-bearing protrusion (23) is fitted to the concrete base (1) via a buffer pad (24).

4. The long-span cable bridge ballastless track according to claim 2, characterized in that: The width of the weight-bearing protrusion (23) along the transverse direction of the bridge is smaller than the width of the transverse concrete connecting block (22) along the transverse direction of the bridge.

5. The long-span cable bridge ballastless track according to claim 2, characterized in that: Each of the weight-bearing protrusions (23) is configured as a rectangular parallelepiped, and four corners of each of the weight-bearing protrusions (23) are chamfered.

6. The long-span cable bridge ballastless track according to claim 1, characterized in that: The length of the prefabricated longitudinal sleeper plate (2) along the longitudinal direction of the bridge is set to 4-5 m, and the distance between two adjacent prefabricated longitudinal sleeper plates (2) is set to 0.1-0.3 m.

7. The long-span cable bridge ballastless track according to claim 1, characterized in that: The concrete base (1) is configured in a plate shape.

8. A track system for a long-span cable bridge, characterized in that: The track system comprises: Steel box girder; A concrete base (1), the concrete base (1) is fixed to the steel box girder, the concrete base (1) is installed with a prefabricated longitudinal sleeper plate (2), the prefabricated longitudinal sleeper plate (2) comprises two prestressed longitudinal beams (21), the two prestressed longitudinal beams (21) are arranged in parallel, a vibration-damping pad (3) is sandwiched between the two prestressed longitudinal beams (21) and the concrete base (1), a plurality of transverse concrete connecting blocks (22) are arranged between the two prestressed longitudinal beams (21), the plurality of transverse concrete connecting blocks (22) are located at both ends of the prestressed longitudinal beams (21), and the plurality of transverse concrete connecting blocks (22) connect the two ends of the two prestressed longitudinal beams (21).

9. A method for constructing a ballastless track for a long-span cable bridge as claimed in claim 1, characterized in that: It includes the following steps: Casting a concrete base (1) on the steel bridge deck, and fixing the concrete base (1) to the steel bridge deck, wherein the concrete base (1) is reserved with a plurality of grooves and a plurality of mortar grooves; Laying a prefabricated longitudinal sleeper plate (2) and a steel rail on a concrete base (1), and fine-adjusting the positioning, wherein a plurality of vibration-damping pads (3) are fixed at the bottom of the prefabricated longitudinal sleeper plate (2); A mortar groove is cast at the bottom of the prefabricated longitudinal sleeper plate (2), so that the concrete base (1) is supported on a plurality of vibration-damping pads (3).

10. The construction method according to claim 9, wherein the prefabricated longitudinal sleeper plate (2) comprises a weighted convex block (23) and a buffer pad (24), characterized in that: Before laying the prefabricated longitudinal sleeper plate (2) on the concrete base (1), the method further comprises: A buffer pad (24) is fixed around and at the bottom of the weight-bearing convex block (23).

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