Steel-concrete supporting track bed structure for updating existing ballastless track bed and construction method of steel-concrete supporting track bed structure

Abstract

The invention relates to a steel-concrete supporting track bed structure for updating an existing ballastless track bed and a construction method of the steel-concrete supporting track bed structure. The steel-concrete supporting track bed structure comprises track bearing platform prefabricated blocks and a folding steel frame. A plurality of transverse rail bearing table inserting rods are arranged on the two transverse sides of the folding steel frame and embedded in the rail bearing table prefabricated blocks. The rail bearing platform prefabricated blocks are concrete prefabricated blocks, are symmetrically arranged on the transverse left side and the transverse right side of the folding steel frame and are longitudinally and uniformly distributed; after the folding steel frame is folded along the center line, the rail bearing platform prefabricated blocks on the two transverse sides are stacked up and down. The folding steel frame and the lower portion of the rail bearing platform precast block are all poured in the concrete roadbed slab, the folding steel frame is of a hollowed-out frame body structure, the overall weight of the structure is greatly reduced, prefabrication, transportation, storage and installation are convenient, the folding steel frame can serve as an internal steel frame of the concrete roadbed slab, rib arrangement operation of pouring of the concrete roadbed slab is omitted, and the construction cost is reduced. And the construction cost is effectively reduced while the construction steps are simplified.

Description

Technical Field

[0001] The invention relates to the technical field of track engineering, and in particular to a steel-concrete support track bed structure for updating an existing ballastless track bed and a construction method thereof. Background Art

[0002] As an important component of modern high-speed railways, the stability and durability of ballastless track 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 trackbeds often suffer from problems such as wear and cracks. In serious cases, ballastless trackbed reconstruction is required.

[0003] The renovation of the existing ballastless track bed has problems such as long construction period, great interference to railway operations, and difficulty in ensuring on-site construction accuracy. In order to overcome the above defects, a construction process of foldable track plates has been proposed. The foldable track plate includes two rail bearing plates and a connecting hinge. The connecting hinge connects the two rail bearing plates together. When unfolded, the two rail bearing plates form a plate body, and when folded, the two rail bearing plates are stacked up and down. During on-site renovation construction, the existing ballastless track bed rail bearing plates are cut off to temporarily support the rails; then, the folded rail bearing plates are transported to the site, and after the temporary support of the rails is removed, the folded rail bearing plates are placed between the two rails and gradually unfolded to form the same plate body; finally, the rails are installed on the rail bearing platform of the rail bearing plate through fasteners to complete the renovation. However, this process still has defects such as heavy plate body, high requirements for construction machinery, and low on-site assembly accuracy.

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

[0005] The purpose of the present invention is to provide a steel-concrete support track bed structure and a construction method thereof for updating an existing ballastless track bed, so as to solve the defects of the existing method such as heavy plate body, high requirements for construction machinery, and low on-site assembly accuracy.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A steel-concrete support ballast bed structure for updating an existing ballastless ballast bed, the steel-concrete support ballast bed structure comprising a prefabricated rail bearing block and a folding steel frame;

[0008] A plurality of transverse rail support platform insertion rods are arranged on both transverse sides of the folding steel frame, and the rail support platform insertion rods are pre-buried in the prefabricated blocks of the rail support platform;

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

[0010] After the folding steel frame is folded in half along the center line, the rail support platform prefabricated blocks on both sides are stacked up and down.

[0011] Furthermore, the folding steel frame includes two laterally symmetrical frames and a connecting hinge between the two frames;

[0012] The connecting hinge connects the two frames together. When unfolded, the two frames form a horizontal frame. When folded, the two frames are stacked up and down.

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

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

[0015] Furthermore, 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 contains at least two, and each group of rail support platform insertion rods is pre-buried in the same rail support platform prefabricated block.

[0017] Furthermore, a vertical embedded sleeve is embedded in the prefabricated block of the rail support platform, and the bottom of the embedded sleeve is fixed to the top of the rail support platform insertion rod.

[0018] Furthermore, the connecting hinge comprises a vertical hinge plate, the hinge plate is arranged at the inner end of the hinged transverse plate, and the hinge plate and the hinged transverse plate are perpendicular to each other.

[0019] Furthermore, the hinge piece is provided with a transversely penetrating connecting hole, and when the two π-shaped half-frames are both located in a horizontal plane, the connecting holes on both sides are transversely butted and anchor bolts are inserted to fix them.

[0020] Furthermore, the connecting hinge also includes a hinge, and two leaves of the hinge are respectively fixed to the inner end bottoms of the hinged horizontal plates on both sides and are connected by inserting a longitudinal connecting shaft.

[0021] Furthermore, the steel-concrete supporting track bed structure also includes a concrete track bed slab, and the folding steel frame and the lower part of the track support platform prefabricated block are all cast in the concrete track bed slab.

[0022] On the other hand, a construction method of a steel-concrete supported ballast bed structure for updating an existing ballastless ballast bed is provided. The method is implemented based on the steel-concrete supported ballast bed structure and comprises:

[0023] Use the skylight time to chisel out the existing ballastless track bed that needs to be replaced, and keep the rails and fasteners;

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

[0025] The folded steel-concrete supporting ballast structure is gradually unfolded to form a horizontal frame, and then anchor bolts are passed through the connection holes to lock the steel-concrete supporting ballast structure;

[0026] Pour concrete within the track bed to complete the renewal construction.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention provides a steel-concrete supporting track bed structure for updating an existing ballastless track bed and a construction method thereof. The structure comprises a track bearing platform prefabricated block, a folding steel frame and a concrete track bed slab. The folding steel frame and the lower part of the track bearing platform prefabricated block are all cast in the concrete track bed slab. The folding steel frame adopts a hollow frame structure, which greatly reduces the overall weight of the structure and is convenient for prefabrication, transportation, storage and installation. It can also be used as an internal steel frame of the concrete track bed slab, eliminating the reinforcement operation of casting the concrete track bed slab, thereby simplifying the construction steps and effectively reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a plan view of the steel-concrete support roadbed structure proposed by the present invention after assembly.

[0031] Figure 2 It is a vertical view of the steel-concrete supporting roadbed structure proposed by the present invention after being assembled and unfolded.

[0032] Figure 3 It is a vertical view of the steel-concrete support roadbed structure proposed by the present invention when it is under construction.

[0033] Figure 4 It is a plan view of the steel-concrete support roadbed structure proposed by the present invention after construction is completed.

[0034] Figure 5 It is a vertical view of the steel-concrete support roadbed structure proposed by the present invention after construction is completed.

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

[0036] The symbols in the figure are:

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

[0038] 11-embedded sleeve;

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

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

[0041] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present invention are given in the drawings. However, the present invention 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 invention more thoroughly understood.

[0042] In the description of the present invention, it is necessary to understand that the terms "center line", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "lateral", "longitudinal" and the like 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 invention 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 invention.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", "setting" and the like should be understood in a broad sense, for example, it can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0045] In a specific implementation manner, the line direction 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 "inside", and the direction far from the center line of the line is defined as "outside".

[0046] The present invention provides a steel-concrete supporting ballast bed structure for updating an existing ballastless track bed. The structure is a bilaterally symmetrical folding structure as a whole and can be used for updating the existing ballastless track bed and replacing the track bed with existing structural defects. The structure has a small overall weight and a fast prefabrication speed, and is convenient for transportation, hoisting and deployment operations. The structure is mainly suitable for areas that need to be efficiently and quickly updated and renovated within the skylight time.

[0047] Specifically, Figure 1 and Figure 2 The steel-concrete supporting track bed structure includes a prefabricated track-bearing platform block 1, a folding steel frame 2 and a concrete track bed slab 5. The prefabricated track-bearing platform block 1 and the folding steel frame 2 are prefabricated structures, and the concrete track bed slab 5 is a cast-in-place structure. Figure 4 and Figure 5 The folding steel frame 2 and the lower part of the track bearing platform prefabricated block 1 are all cast in the concrete track bed slab 5.

[0048] like Figure 1 The rail support platform prefabricated block 1 is a small concrete prefabricated block, which is divided into left and right parts, symmetrical in the line, and evenly distributed longitudinally. A vertical pre-embedded sleeve 11 is embedded inside the rail support platform prefabricated block 1, and the rail 4 can be installed and fixed by fasteners.

[0049] like Figure 1-3 The folding steel frame 2 includes two horizontally symmetrical frames and a connecting hinge 3 between the two frames. The connecting hinge 3 connects the two frames together. When unfolded, the two frames form a horizontal frame, and when folded, the two frames are stacked up and down.

[0050] Specifically, the frame is a π-shaped half frame 21, including 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 front and back, and the connecting hinge 3 is installed on the inner end of the hinged transverse plate 23. In other embodiments, the number of hinged transverse plates 23 in the frame may not be two, and can be adjusted to other numbers according to the updated length of the track bed and the length of the frame. Under the premise of ensuring the rigidity of the overall structure, the material consumption is saved as much as possible. A rectangular frame is formed in the middle of the frame, which significantly reduces the overall weight. In addition, when pouring concrete on site to form a concrete track bed slab 5, it can be used as an internal steel frame, eliminating the reinforcement construction operation, simplifying the construction steps, and improving the construction efficiency.

[0051] Furthermore, a plurality of transverse rail support rods 22 are provided on both transverse sides of the folding steel frame 2, and the rail support rods 22 are embedded in the rail support prefabricated block 1, forming a structure in which the inner end of the rail support prefabricated block 1 is inserted into the rail support prefabricated block 1, supporting and positioning the rail support prefabricated block 1. Specifically, the rail support rods 22 are located on the outside of the longitudinal connecting rods 24, and the rail support rods 22 are arranged in groups, each group includes at least two rail support rods, and each group of rail support rods 22 is embedded in the same rail support prefabricated block 1. After the folding steel frame 2 is folded along the center line, the rail support prefabricated blocks 1 on both transverse sides are stacked up and down.

[0052] like Figure 2 -and Figure 3The connecting hinge 3 includes a vertical hinge piece 32, which is L-shaped as a whole. The hinge piece 32 is arranged at the inner end of the hinge horizontal plate 23, and the hinge piece 32 and the hinge horizontal plate 23 are perpendicular to each other. A horizontal through-connecting hole 34 is arranged on the hinge piece 32. When the two π-shaped half-frames 21 are both located in a horizontal plane, the connecting holes 34 on both sides are horizontally butted and the anchor bolts 33 are inserted and fixed, which plays a locking role.

[0053] like Figure 2 and Figure 6 The connecting hinge 3 also includes a hinge 31, and two leaves of the hinge 31 are respectively fixed to the inner end bottom of the hinged horizontal plate 23 on both sides, and are connected by inserting a longitudinal connecting shaft 35. Based on the hinge 31, the π-shaped half frame 21 on both sides can rotate around the connecting shaft 35, and the entire frame can be folded or unfolded.

[0054] The number of connecting hinges 3 provided on each hinged transverse plate 23 is determined according to the length of the hinged transverse plate 23 , and at least two are provided to ensure stability and reliability when folding or unfolding.

[0055] In the above structure, the π-shaped half frame 21 is an integrally formed steel structure, that is, the longitudinal connecting rod 24, the hinged cross plate 23 and the rail support platform plug rod 22 are an integral structure. The hinge 32 is also made of steel plate material and is fixed to the hinged cross plate 23 by welding or bolting. Of course, the hinge 32 can also be an integral structure formed by bending the end of the hinged cross plate 23. The hinge 31 adopts the currently common hinged hinge structure, and the two blades are installed on the hinged cross plate 23 by bolting. In addition, the embedded sleeve 11 embedded in the rail support platform prefabricated block 1 can be fixed to the top of the rail support platform plug rod 22 by welding.

[0056] The above-mentioned steel-concrete support ballast bed structure construction method for updating an existing ballastless ballast bed specifically comprises the following steps:

[0057] S1: Use the skylight time to chisel out the existing ballastless track bed that needs to be replaced, and retain the rails 4 and fasteners.

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

[0059] The steel-concrete supporting track bed structure is a detachable structure, in which the π-shaped half frame 21 and the rail support platform prefabricated block 1 are used in pairs. When prefabricating the steel-concrete supporting track bed structure, the embedded sleeve 11 is welded to the top of the rail support platform plug rod 22 in the π-shaped half frame 21, and then the rail support platform prefabricated block 1 is prefabricated at the position of the rail support platform plug 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 which 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 rail 4 and the fasteners, the folded steel-concrete supporting ballast bed structure is gradually unfolded to form a horizontal frame, and fine-tuning work is carried out. After meeting the line smoothness requirements, the anchor bolts 33 are passed through the connecting holes 34 to lock the steel-concrete supporting ballast bed structure.

[0062] S4: After locking is completed and the position and elevation are confirmed to be correct, quick-setting plain concrete is poured within the ballast range. After the concrete solidifies and reaches the required strength, the renewal construction is completed.

[0063] The present invention can replace the ballastless track bed without removing the rails. The structure is light in weight, easy to transport, has high production accuracy, small on-site adjustment, high construction efficiency and low cost, and provides an efficient, economical and reliable solution for the renovation of existing ballastless track beds.

[0064] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A steel-concrete support ballast bed structure for updating an existing ballastless ballast bed, characterized in that: The steel-concrete supporting track bed structure comprises a track support prefabricated block (1) and a folding steel frame (2); A plurality of transverse rail support platform insertion rods (22) are arranged on both transverse sides of the folding steel frame (2), and the rail support platform insertion rods (22) are pre-buried in the rail support platform prefabricated block (1); The rail support platform prefabricated blocks (1) are concrete prefabricated blocks, which are symmetrically arranged on the left and right sides of the folding steel frame (2) in the horizontal direction and evenly distributed in the vertical direction; After the folding steel frame (2) is folded in half along the center line, the rail support platform prefabricated blocks (1) on both sides are stacked up and down.

2. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 1 is characterized in that: The folding steel frame (2) comprises two laterally symmetrical frames and a connecting hinge (3) between the two frames; The connecting hinge (3) connects the two frames together. When unfolded, the two frames form a horizontal frame. When folded, the two frames are stacked up and down.

3. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 2 is characterized in that: The frame is a π-shaped half frame (21), comprising a longitudinal connecting rod (24) and two hinged transverse plates (23) inside the longitudinal connecting rod (24), wherein the two hinged transverse plates (23) are arranged longitudinally front to back; The connecting hinge (3) is mounted to the inner end of the hinged cross plate (23).

4. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 3 is characterized in that: The rail support platform insertion rod (22) is located outside the longitudinal connecting rod (24); The rail support platform insertion rods (22) are arranged in groups, each group includes at least two, and each group of rail support platform insertion rods (22) is pre-buried in the same rail support platform prefabricated block (1).

5. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 4 is characterized in that: A vertical embedded sleeve (11) is embedded in the rail support platform prefabricated block (1), and the bottom of the embedded sleeve (11) is fixed to the top of the rail support platform insertion rod (22).

6. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 5 is characterized in that: The connecting hinge (3) comprises a vertical hinge plate (32), the hinge plate (32) is arranged at the inner end of the hinged transverse plate (23), and the hinge plate (32) and the hinged transverse plate (23) are perpendicular to each other.

7. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 6 is characterized in that: The hinge piece (32) is provided with a transversely penetrating connection hole (34). When the two π-shaped half-frames (21) are both located on a horizontal plane, the connection holes (34) on both sides are transversely butted and anchor bolts (33) are inserted and fixed.

8. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 7 is characterized in that: The connecting hinge (3) further comprises a hinge (31), the two leaves of which are respectively fixed to the inner end bottoms of the hinged transverse plates (23) on both sides and connected by inserting a longitudinal connecting shaft (35).

9. The steel-concrete support ballast bed structure for updating an existing ballastless ballast bed according to claim 8 is characterized in that: The steel-concrete supporting ballast structure also includes a concrete ballast plate (5), and the lower part of the folding steel frame (2) and the prefabricated block of the rail support platform (1) are all cast in the concrete ballast plate (5).

10. A steel-concrete support ballast bed structure construction method for updating an existing ballastless ballast bed, characterized in that: The method is implemented based on the steel-concrete supported roadbed structure according to claim 9, comprising: Using the window time, the existing ballastless track bed that needs to be replaced is chiseled out, and the rails (4) and fasteners are retained; The prefabricated steel-concrete supporting ballast structure is transported to the site in a folded form and placed between two steel rails (4); The folded steel-concrete supporting ballast bed structure is gradually unfolded to form a horizontal frame, and then the anchor bolts (33) are passed through the connection holes (34) to lock the steel-concrete supporting ballast bed structure; Pour concrete within the track bed to complete the renewal construction.

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