Steel-concrete supporting bed structure for updating existing ballastless bed and construction method thereof

Abstract

The present application relates to a kind of steel concrete support track bed structure for existing ballast track bed renewal and its construction method, the steel concrete support track bed structure includes track support precast block and folding steel frame;Multiple lateral track support insertion rods are provided on the lateral sides of folding steel frame, and track support insertion rod is embedded into track support precast block;Track support precast block is concrete precast block, and symmetrically arranged on the lateral sides of folding steel frame, and longitudinally evenly distributed;After folding steel frame is folded along center line, the track support precast block on lateral sides is stacked up and down.The lower part of folding steel frame and track support precast block is all poured in concrete track bed plate in the present application, wherein, folding steel frame adopts hollow frame structure, greatly reduces the overall weight of structure, is convenient for prefabrication, transportation, storage and installation, and can be used as the internal steel frame of concrete track bed plate, saves the reinforcement operation of pouring concrete track bed plate, while simplifying construction steps, effectively reduces construction cost.

Description

Technical Field

[0001] This invention relates to the field of track engineering technology, specifically to a steel-concrete supported track bed structure and its construction method for the renewal of existing ballastless track beds. Background Technology

[0002] Ballastless track is an important component of modern high-speed railways, and its stability and durability are directly related to the safety of train operation. The design service life of ballastless track is generally 60 years. After long-term service, existing ballastless track beds often experience problems such as wear and cracks, and in severe cases, ballastless track bed renovation is required.

[0003] Upgrading existing ballastless track beds presents challenges such as long construction periods, significant disruption to railway operations, and difficulty in ensuring on-site construction precision. To overcome these shortcomings, a foldable track slab construction process has been proposed. This foldable track slab consists of two rail bearing plates and a connecting hinge. The connecting hinge connects the two rail bearing plates together, forming a single slab when unfolded, and stacking them vertically when folded. During on-site upgrading, the existing ballastless track bed rail bearing plates are removed, and the rails are temporarily supported. The folded rail bearing plates are then transported to the site, the temporary rail supports are removed, and the folded rail bearing plates are placed between the two rails and gradually unfolded to form a single slab. Finally, the rails are installed onto the rail bearing platforms using fasteners, completing the upgrade. However, this process still suffers from drawbacks such as the heavy weight of the slab, high requirements for construction machinery, and low on-site assembly precision.

[0004] Therefore, it is necessary to propose new measures to overcome the above-mentioned shortcomings. Summary of the Invention

[0005] The purpose of this invention is to provide a steel-concrete supported track bed structure and its construction method for the renewal of existing ballastless track beds, so as to solve the defects of existing methods such as heavy slab self-weight, high requirements for construction machinery, and low on-site assembly accuracy.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A reinforced concrete track support structure for the renewal of existing ballastless track, the reinforced concrete track support structure comprising precast rail support blocks and folded steel frames;

[0008] Multiple transverse rail support rods are provided on both sides of the folding steel frame, and the rail support rods are pre-embedded in the rail support precast block.

[0009] The precast blocks of the rail support platform are precast concrete blocks, which are symmetrically arranged on the left and right sides of the folded steel frame and evenly distributed in the longitudinal direction.

[0010] After the folding steel frame is folded along the centerline, the precast rail support blocks on both sides are stacked one on top of the other.

[0011] Further, the folding steel frame comprises two horizontally left-right symmetrical frame bodies and a connecting hinge between the two frame bodies;

[0012] The connecting hinge connects the two frame bodies together, and when unfolded, the two frame bodies form a horizontal frame, and when folded, the two frame bodies are stacked vertically.

[0013] Further, the frame body is a π-shaped half frame body, comprising a longitudinal connecting rod and two hinged cross plates inside the longitudinal connecting rod, and the two hinged cross plates are arranged longitudinally front and back;

[0014] The connecting hinge is installed to the inner end of the hinged cross plate.

[0015] Further, the rail support platform insertion rod is located outside the longitudinal connecting rod;

[0016] The rail support platform insertion rods are arranged in groups, each group containing at least two, and each group of rail support platform insertion rods is pre-buried in the same rail support platform precast block.

[0017] Further, a vertical pre-buried sleeve is pre-buried in the rail support platform precast block, and the bottom of the pre-buried sleeve is fixed to the top of the rail support platform insertion rod.

[0018] Further, the connecting hinge comprises a vertical hinge plate, which is arranged at the inner end of the hinged cross plate, and the hinge plate is perpendicular to the hinged cross plate.

[0019] Further, a transversely penetrating connecting hole is provided on the hinge plate, and when the two π-shaped half frame bodies are located in the horizontal plane, the connecting holes on both sides are transversely butted and inserted into anchor bolts for fixation.

[0020] Further, the connecting hinge further comprises a hinge, and the two leaves of the hinge are respectively fixed to the inner end bottom of the hinged cross plates on both sides and are connected by inserting a longitudinal connecting shaft.

[0021] Further, the steel-concrete supporting track bed structure further comprises a concrete track bed plate, and the lower part of the folding steel frame and the rail support platform precast block are all cast in the concrete track bed plate.

[0022] On the other hand, a steel-concrete supporting track bed structure construction method for updating existing ballastless track bed is provided, which is based on the implementation of the steel-concrete supporting track bed structure, comprising:

[0023] Using the sky window time, the existing ballastless track bed that needs to be replaced is removed, and the steel rails and fasteners are retained;

[0024] The prefabricated steel-concrete supporting track bed structure is transported to the site in a folded form and placed in the middle of the two steel rails;

[0025] The folded steel-mix support track bed structure is gradually unfolded to form a horizontal frame, and then the anchor bolt is locked through the connecting hole to lock the steel-mix support track bed structure;

[0026] The concrete is poured in the track bed range, and the updating construction is completed.

[0027] Compared with the prior art, the beneficial effects of the present application are as follows:

[0028] The present application provides a steel-mix support track bed structure for existing ballastless track bed updating and a construction method thereof. The structure comprises a rail support precast block, a folded steel frame and a concrete track bed plate. The folded steel frame and the lower part of the rail support precast block are all poured into the concrete track bed plate. The folded steel frame adopts a hollow frame structure, which greatly reduces the overall weight of the structure, facilitates prefabrication, transportation, storage and installation, and can be used as an internal steel frame of the concrete track bed plate, thereby eliminating the reinforcement operation of pouring the concrete track bed plate, simplifying the construction steps and effectively reducing the construction cost. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings of other embodiments can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0030] Figure 1 is a plan view of the steel-mix support track bed structure unfolded after assembly according to the present application.

[0031] Figure 2 is an elevation view of the steel-mix support track bed structure unfolded after assembly according to the present application.

[0032] Figure 3 is an elevation view of the steel-mix support track bed structure unfolded during construction according to the present application.

[0033] Figure 4 is a plan view of the steel-mix support track bed structure after construction according to the present application.

[0034] Figure 5 is an elevation view of the steel-mix support track bed structure after construction according to the present application.

[0035] Figure 6 is a plan view of the hinge.

[0036] In the figure, the following are marked:

[0037] 1-rail support precast block, 2-folded steel frame, 3-connecting hinge, 4-steel rail, 5-concrete track bed plate;

[0038] 11-embedded sleeve;

[0039] 21-π-shaped half frame, 22-rail bearing plug, 23-hinged cross plate, 24-longitudinal connecting rod;

[0040] 31-hinge, 32-hinge piece, 33-anchor bolt, 34-connection hole, 35-connection shaft. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the present application, the present application will be described in more detail below with reference to the relevant drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0042] In the description of the present application, it should be understood that the terms "midline", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "arrangement" and the like should be understood broadly, for example, it can be fixedly connected, arranged, or detachably connected, arranged, or integrally connected, arranged. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] It should also be noted that although the order of the steps is involved in the method description, in some cases, the order can be performed in a different order from here, and should not be understood as a limitation on the order of the steps.

[0045] In the detailed description, the direction of the line is defined as the longitudinal direction, the direction perpendicular thereto is defined as the transverse direction, the direction close to the center line of the line is defined as "inner", and the direction away from the center line of the line is defined as "outer".

[0046] The present application provides a steel-concrete supporting track bed structure for updating existing ballastless track bed, which is a left-right symmetrical folded structure, can be used for updating existing ballastless track bed, replacing the track bed with structural defects, has small overall structure weight, fast prefabrication speed, and is convenient for transportation, hoisting and unfolding operation, and is mainly suitable for sections requiring efficient and rapid updating and reconstruction within the sky window time.

[0047] Specifically, as Figure 1 And Figure 2 , the steel-concrete supporting track bed structure comprises rail bearing platform prefabricated blocks 1, folded steel frames 2, and concrete track bed plates 5, the rail bearing platform prefabricated blocks 1 and the folded steel frames 2 are prefabricated structures, and the concrete track bed plates 5 are cast-in-place structures. As Figure 4 And Figure 5 , the folded steel frames 2 and the lower parts of the rail bearing platform prefabricated blocks 1 are all cast in the concrete track bed plates 5.

[0048] As Figure 1 , the rail bearing platform prefabricated blocks 1 are small concrete prefabricated blocks, which are arranged in left and right split modes, are symmetrical in left and right directions in the line, and are uniformly distributed in the longitudinal direction. Vertical embedded sleeves 11 are embedded in the rail bearing platform prefabricated blocks 1, and the embedded sleeves 11 can be used to install and fix the steel rails 4 by using fasteners.

[0049] As Figures 1-3 , the folded steel frames 2 comprise two horizontally and left-right symmetrical frame bodies and connecting hinges 3 between the two frame bodies. The connecting hinges 3 connect the two frame bodies together, and when unfolded, the two frame bodies form a horizontal frame, and when folded, the two frame bodies are stacked vertically.

[0050] Specifically, the frame body is a π-shaped half frame body 21, which comprises a longitudinal connecting rod 24 and two hinged transverse plates 23 inside the longitudinal connecting rod 24, the two hinged transverse plates 23 are arranged longitudinally in front and back, and the connecting hinge 3 is installed at the inner end of the hinged transverse plate 23. In other embodiments, the number of hinged transverse plates 23 in the frame body can not be two, and can be adjusted to other numbers according to the length of the track bed renewal and the length of the frame body, and under the premise of ensuring the overall structural rigidity, the material usage is saved as much as possible. The middle part of the frame body forms a rectangular frame, which significantly reduces the overall weight, and when the concrete is cast on site to form the concrete track bed plate 5, it can be used as an internal steel frame, which saves the construction operation of arranging reinforcement and simplifies the construction steps, thereby improving the construction efficiency.

[0051] Further, a plurality of transverse rail bearing platform insertion rods 22 are arranged on the transverse two sides of the folded steel frame 2, the rail bearing platform insertion rods 22 are embedded into the rail bearing platform prefabricated blocks 1, forming a structure that the inner end of the rail bearing platform prefabricated block 1 is inserted into the rail bearing platform prefabricated block 1, supporting and positioning the rail bearing platform prefabricated block 1. Specifically, the rail bearing platform insertion rods 22 are located on the outside of the longitudinal connecting rod 24, the rail bearing platform insertion rods 22 are arranged in groups, each group contains at least two, and each group of rail bearing platform insertion rods 22 is embedded in the same rail bearing platform prefabricated block 1. After the folded steel frame 2 is folded along the center line, the rail bearing platform prefabricated blocks 1 on the transverse two sides are stacked vertically.

[0052] As Figure 2 - and Figure 3The connecting hinge 3 includes vertical hinge plates 32, which are integrally formed in L shape. The hinge plates 32 are arranged at the inner ends of the hinge cross plates 23 and are perpendicular to the hinge cross plates 23. The hinge plates 32 are provided with transversely penetrating connecting holes 34. When the two π-shaped half frames 21 are located in the horizontal plane, the connecting holes 34 on the two sides are transversely butted and inserted into the anchor bolts 33 to be fixed, thereby playing a locking role.

[0053] As Figure 2 and Figure 6 The connecting hinge 3 further includes a hinge 31. The two leaves of the hinge 31 are respectively fixed at the inner end bottoms of the hinge cross plates 23 on the two sides and are connected by inserting a longitudinal connecting shaft 35. Based on the hinge 31, the π-shaped half frames 21 on the two sides can rotate around the connecting shaft 35, and the whole frame can be folded or unfolded.

[0054] The number of the connecting hinges 3 arranged on each hinge cross plate 23 is determined according to the length of the hinge cross plate 23. At least two connecting hinges 3 are arranged to guarantee the stability and reliability during folding or unfolding.

[0055] In the above structure, the π-shaped half frame 21 is integrally formed as a steel structure, that is, the longitudinal connecting rod 24, the hinge cross plate 23 and the rail support base insertion rod 22 are integrally formed. The hinge plate 32 is also made of a steel plate and is fixed to the hinge cross plate 23 by welding or bolt connection. Of course, the hinge plate 32 can also be integrally formed by bending the end of the hinge cross plate 23. The hinge 31 adopts a commonly used hinge structure. The two leaves are installed on the hinge cross plate 23 by bolt connection. In addition, the embedded sleeve 11 embedded in the rail support base precast block 1 can be fixed to the top of the rail support base insertion rod 22 by welding.

[0056] The above steel-concrete supporting track bed structure construction method for updating existing ballastless track beds specifically includes the following steps:

[0057] S1: Using the sky window time, the existing ballastless track bed to be replaced is chiseled out, and the steel rails 4 and fasteners are reserved.

[0058] S2: The prefabricated steel-concrete supporting track bed structure is transported to the site in a folded form and is placed between the two steel rails 4.

[0059] The steel-concrete supporting track bed structure is a detachable structure. The π-shaped half frame 21 and the rail support base precast block 1 are used in pairs. When the steel-concrete supporting track bed structure is prefabricated, the embedded sleeve 11 is welded to the top of the rail support base insertion rod 22 in the π-shaped half frame 21, then the rail support base precast block 1 is prefabricated at the position of the rail support base insertion rod 22, and finally the connecting hinge 3 is installed.

[0060] During storage and transportation, the connecting hinge 3 is in an open state. At this time, the left and right π-shaped half frames 21 are attached together, and the top surfaces are parallel to each other.

[0061] S3: After ensuring that the rail support platform is aligned with the steel rail 4 and the fastener, the folded steel-concrete support track bed structure is gradually unfolded to form a horizontal frame, and fine adjustment work is carried out. After meeting the requirements of line smoothness, the anchor bolt 33 is locked through the connecting hole 34 to lock the steel-concrete support track bed structure.

[0062] S4: After the locking is completed and the position and elevation are confirmed to be correct, rapid-setting cement concrete is poured in the range of the track bed. After the concrete is solidified and reaches the strength, the updating construction is completed.

[0063] The present application can replace the ballastless track bed without removing the steel rail, has light structure weight, is convenient to transport, has high production precision, has small on-site adjustment amount, has high construction efficiency, and has low cost, and provides an efficient, economical, and reliable solution for the updating and reconstruction of the existing ballastless track bed.

[0064] The above application of specific examples is used to describe the present application, which is only used to help understand the present application and does not limit the present application. For the skilled person in the technical field to which the present application belongs, according to the idea of the present application, a number of simple deductions, deformations, or substitutions can be made.

Claims

1. A steel-concrete supported track bed structure for updating existing ballastless track bed, characterized in that: the steel-concrete supported track bed structure comprises rail support precast blocks (1) and folded steel frames (2); the folded steel frames (2) are provided with a plurality of rail support inserting rods (22) on the lateral sides, which are embedded in the rail support precast blocks (1); the rail support precast blocks (1) are concrete precast blocks, which are symmetrically arranged on the left and right sides of the folded steel frames (2) and uniformly distributed longitudinally; the folded steel frames (2) are folded along the center line, and the rail support precast blocks (1) on the lateral sides are stacked vertically; the folded steel frames (2) comprise two horizontally symmetric frame bodies and a connecting hinge (3) between the two frame bodies; the connecting hinge (3) connects the two frame bodies together, and when unfolded, the two frame bodies form a horizontal frame, and when folded, the two frame bodies are stacked vertically; the frame body is a π-shaped half frame body (21), which comprises a longitudinal connecting rod (24) and two hinged cross plates (23) on the inner side of the longitudinal connecting rod (24), and the two hinged cross plates (23) are arranged longitudinally in front and back; the connecting hinge (3) is installed at the inner end of the hinged cross plate (23).

2. The steel-concrete supported track bed structure for updating existing ballastless track bed according to claim 1, characterized in that: the rail support inserting rods (22) are located on the outer side of the longitudinal connecting rod (24); the rail support inserting rods (22) are arranged in groups, each group containing at least two, and each group of rail support inserting rods (22) is embedded in the same rail support precast block (1).

3. The steel-concrete supported track bed structure for updating existing ballastless track bed according to claim 2, characterized in that: a vertical embedded sleeve (11) is embedded in the rail support precast block (1), and the bottom of the embedded sleeve (11) is fixed to the top of the rail support inserting rod (22).

4. The steel-concrete supported track bed structure for updating existing ballastless track bed according to claim 3, characterized in that: the connecting hinge (3) comprises a vertical hinge piece (32), which is arranged at the inner end of the hinged cross plate (23), and the hinge piece (32) is perpendicular to the hinged cross plate (23).

5. The steel-concrete supported track bed structure for updating existing ballastless track bed according to claim 4, characterized in that: a transversely penetrating connecting hole (34) is arranged on the hinge piece (32), and when the two π-shaped half frame bodies (21) are located in the horizontal plane, the connecting holes (34) on the two sides are transversely butted and inserted into anchor bolts (33) for fixation.

6. The steel-concrete supported track bed structure for updating existing ballastless track bed according to claim 5, characterized in that: the connecting hinge (3) further comprises a hinge (31), and the two leaves of the hinge (31) are respectively fixed at the inner end bottom of the hinged cross plates (23) on the two sides and connected by inserting a longitudinal connecting shaft (35).

7. The steel-concrete supported track bed structure for updating existing ballastless track bed according to claim 6, characterized in that: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The steel-concrete supporting track bed structure further comprises a concrete track bed plate (5), and the folded steel frame (2) and the lower part of the rail supporting platform prefabricated block (1) are all poured into the concrete track bed plate (5).

8. A construction method of a steel-concrete supporting track bed structure for updating an existing ballastless track bed, characterized in that: The method is implemented based on the steel-concrete supporting track bed structure of claim 7, comprising: During a sky window time, the existing ballastless track bed to be replaced is removed, and the rails (4) and fasteners are reserved; The prefabricated steel-concrete supporting track bed structure is transported to the site in a folded form and placed between the two rails (4); The folded steel-concrete supporting track bed structure is gradually unfolded to form a horizontal frame, and then the anchor bolts (33) are locked through the connecting holes (34) to lock the steel-concrete supporting track bed structure; The concrete is poured in the track bed range to complete the updating construction.

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