Ballast bed structure for updating existing ballast bed and construction method thereof

Abstract

The present application relates to a kind of bed structure for existing ballast bed renewal and its construction method.Present ballast track renewal mainly uses the way of local removal and then present pouring rapid-setting concrete, which is extremely difficult, extremely low efficiency, extremely high cost and long-term impact on operation.The structure includes two rail bearing plates and the connecting hinge between the two rail bearing plates, and a column of longitudinal rail bearing platforms is arranged on the top of each rail bearing plate.The connecting hinge connects the two rail bearing plates together, and when unfolded, the two rail bearing plates form a plate body, and when folded, the two rail bearing plates are stacked one on top of the other.Most of the structures of the present application are prefabricated structures, which are transported to the site in a folded state, placed in the middle of the two rails and gradually unfolded, with high precision adjustment and significantly simplified operation process, without affecting normal operation, and with promotional value.

Description

Technical Field

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

[0002] Ballastless track boasts significant advantages such as high integrity, excellent stability, and minimal maintenance during operation, significantly reducing operational and maintenance workload. It is widely used in high-speed railways and urban rail transit lines. The design lifespan of ballastless track is generally 60 years, while the design lifespan of the underlying foundation is typically 100 years. Therefore, the ballastless track bed needs to be replaced once within the design lifespan of the foundation. Currently, the renovation and upgrading of existing ballastless track mainly involves partial removal followed by recasting quick-setting concrete, which is extremely difficult, inefficient, costly, and has long-term operational impacts.

[0003] Therefore, it is necessary to propose new modification measures for the renovation of existing ballastless tracks to overcome the shortcomings of existing methods. Summary of the Invention

[0004] The purpose of this invention is to provide a track bed structure and its construction method for the renewal of existing ballastless track beds, so as to solve the problems of high difficulty, low efficiency, high cost and long-term impact on operation of the current method of partial demolition and recasting quick-setting concrete.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A track bed structure for updating existing ballastless track beds, the structure comprising two rail bearing plates and a connecting hinge between the two rail bearing plates, with a row of longitudinally arranged rail bearing platforms provided on the top of each rail bearing plate;

[0007] The connecting hinge connects the two rail plates together. When unfolded, the two rail plates form a single plate. When folded, the two rail plates are stacked one on top of the other.

[0008] Furthermore, the connecting hinge includes a hinge plate and a rotating shaft;

[0009] The hinge plate is disposed on the inner end face of the bearing plate, and a longitudinal shaft tube is disposed at the bottom of the hinge plate.

[0010] The hinge plates of the two bearing plates are longitudinally staggered front and rear, and coaxially connected in the longitudinal direction, with the rotating shaft inserted into all the hinge plates.

[0011] Furthermore, the hinge plate is L-shaped and includes a vertical plate and a bottom plate;

[0012] The vertical plate is embedded in the inner end face of the rail plate, and the bottom plate is embedded in the inner bottom face of the rail plate.

[0013] Furthermore, the outer side of the vertical plate is provided with transverse anchors, which are pre-embedded in the rail bearing plate.

[0014] Furthermore, a connecting hole plate is provided on the top of the hinge plate, and the connecting hole plate is located on the inner top surface of the support plate;

[0015] The connecting hole plate is provided with a transverse connecting hole, and the connecting hole plates of the hinge pieces of the two bearing plates are connected to each other. The two connecting holes are transversely connected and connected to each other by inserting bolts.

[0016] Furthermore, the structure also includes an adjustment layer located below the rail support plate.

[0017] Furthermore, the rail plate is provided with vertically penetrating grouting holes for pouring the adjustment layer.

[0018] Furthermore, the outer side of the rail plate is provided with transverse fine-tuning bolt holes.

[0019] On the other hand, a construction method for a ballastless track structure for the renewal of existing ballastless track beds as described above is provided, the method comprising:

[0020] Prefabricated rail plates, with pre-set connecting hinges between two rail plates and folding the rail plates;

[0021] The existing ballastless track bed bearing slab was removed, and the rails were temporarily supported.

[0022] The folded rail support plates were transported to the site, and the temporary supports for the rails were removed.

[0023] The folded rail plate is placed between the two rails and gradually unfolded to form a single plate.

[0024] The rails are installed onto the rail bearing platform using fasteners.

[0025] After the rails are precisely adjusted, the two rail bearing plates are locked in place using bolts.

[0026] Furthermore, the method also includes:

[0027] Adjustment layer material is injected under the rail bearing plate through the grouting holes to form an adjustment layer under the rail bearing plate.

[0028] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0029] This invention proposes a track bed structure for the renewal of existing ballastless track beds. During early track maintenance windows, the existing ballastless track bed structure can be gradually removed, and the rails can be temporarily supported using timber or brackets to ensure train passage during non-maintenance windows, avoiding long-term operational disruptions. Most of the structure is prefabricated and transported to the site during maintenance windows. After removing the temporary support structure, the structure can be placed between two rails and the rail support plate can be gradually unfolded. After unfolding, the rails are connected using fasteners, and the rails are fine-tuned using the plate. This method offers high construction efficiency and adjustment accuracy. Furthermore, after the rails are fine-tuned, anchor bolts can be inserted through the hinge connection holes and locked in place. Then, a quick-setting, early-strength adjustment layer material is injected under the plate through grouting holes. After solidification, the track bed renewal is complete. The operation process is significantly simplified and has widespread application value. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other embodiments can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a plan view of the rail support plate after assembly according to the present invention.

[0032] Figure 2 This is a plan view of the rail plate of the present invention after assembly and folding.

[0033] Figure 3 This is a schematic diagram showing the placement of the rail bearing plate of the present invention before it is transported to the construction site for installation.

[0034] Figure 4 This is a plan view of the track bed structure for updating existing ballastless track beds according to the present invention.

[0035] Figure 5 This is a cross-sectional view of the track bed structure for updating existing ballastless track beds according to the present invention.

[0036] Figure 6 This is a structural diagram of the hinge plate of the present invention.

[0037] The diagram is labeled as follows:

[0038] 1-Rail support plate, 2-Connecting hinge, 3-Adjusting layer, 4-Rail, 5-Fastener;

[0039] 11-Rail support platform, 12-Grouting hole, 13-Finishing bolt hole;

[0040] 21-Rotating shaft, 22-Hinge plate, 23-Anchor pin, 24-Connecting hole, 25-Bolt;

[0041] 221-Vertical plate, 222-Base plate, 223-Connecting hole plate, 224-Shaft tube. Detailed Implementation

[0042] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0043] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "longitudinal", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," etc., should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0045] In a specific implementation, the direction of the line is defined as longitudinal, the direction perpendicular to the direction of the line is defined as transverse, the direction closer to the centerline of the line is defined as the inner side, and the direction farther from the centerline of the line is defined as the outer side.

[0046] This invention provides a track bed structure for the renewal of existing ballastless track beds. It is suitable for sections where existing ballastless track beds need to be renewed and upgraded after reaching the end of their service life. The prefabricated structure can be transported to the site and directly replace the original structure, which can significantly improve the renewal speed and installation accuracy.

[0047] like Figure 1-6 The structure consists of two parts: precast and cast-in-place. The precast structure includes two support rail plates 1 and connecting hinges 2 between the two support rail plates 1. Each support rail plate 1 has a row of longitudinally arranged support rail platforms 11 on its top, which are evenly distributed longitudinally. The support rail plates 1 are used in pairs, and the connecting hinges 2 connect the left and right support rail plates 1 together. When unfolded, the two support rail plates 1 form a single plate. When folded, the bottom surfaces of the two support rail plates 1 contact each other and are stacked on top of each other, reducing the width to half. Multiple connecting hinges 2 can be installed between the left and right support rail plates 1 as needed.

[0048] The connecting hinge 2 includes a hinge plate 22 and a rotating shaft 21. The hinge plate 22 is located on the inner end face of the support plate 1, and a longitudinal shaft tube 224 is provided at the bottom of the hinge plate 22. The shaft tubes 224 of the hinge plates 22 of the two support plates 1 are longitudinally staggered front and rear, and coaxially connected in the longitudinal direction. The rotating shaft 21 is inserted into all the shaft tubes 224. The hinge plate 22 is L-shaped and includes a vertical plate 221 and a bottom plate 222. The vertical plate 221 is embedded in the inner end face of the support plate 1, and the bottom plate 222 is embedded in the inner bottom surface of the support plate 1. A transverse anchor 23 is provided on the outer side of the vertical plate 221, and the anchor 23 is embedded in the support plate 1. The top of the hinge plate 22 is provided with a connecting hole plate 223. The connecting hole plate 223 is located on the inner top surface of the support plate 1. The connecting hole plate 223 is provided with a transverse connecting hole 24. The connecting hole plates 223 of the hinge plates 22 of the two support plates 1 are connected to each other. The two connecting holes 24 are transversely connected and connected to each other by inserting bolts 25.

[0049] The vertical plate 221, the base plate 222, the connecting hole plate 223, and the shaft tube 224 are integrated into a single structure and are pre-embedded together in the inner end face of the support plate 1. After the inner sides of the two support plates 1 make contact, a rotating shaft 21 is inserted into the shaft tube 224 to hinge the two support plates 1 together, allowing the two support plates 1 to be folded downwards. Anchor nails 23 are welded to the outer side of the vertical plate 221 and embedded in the support plate 1, providing reinforced anchoring for the connecting hinge 2.

[0050] During storage and transportation, the connecting hinge 2 is in the open state, at which time the bottom surfaces of the left and right rail plates 1 are pressed together and folded together. After arriving at the construction site, the folded rail plates 1 are placed under the rails between the two rails, and the connecting hinge 2 is gradually closed during the placement process. After it is fully closed, bolts 25 are used to lock it through the connecting hole 24. At this time, the top surfaces of the left and right rail plates 1 are on the same plane.

[0051] The outer side of the rail plate 1 is provided with transverse fine adjustment bolt holes 13. During on-site construction, the fine adjustment claw can be installed in the fine adjustment bolt holes 13 to adjust and position the rail plate 1. After the rail plate 1 is installed in place, it can be finely adjusted laterally.

[0052] The cast-in-place structure includes an adjustment layer 3, which is located below the rail support plate 1. The adjustment layer 3 is a cast-in-place structure and serves as a supplement for height adjustment. The rail support plate 1 is provided with vertically penetrating grouting holes 12. After the rail support plate 1 is installed in place, the adjustment layer 3 can be poured through the grouting holes 12.

[0053] When an existing track bed reaches its designed service life and needs to be upgraded, the upgrade can be carried out based on the above structure, specifically including the following steps:

[0054] S1: Prefabricated rail plate 1, with a pre-set connecting hinge 2 between two rail plates 1 and the rail plate 1 folded;

[0055] S2: Remove the existing ballastless track bed bearing slab and use square timber or brackets to temporarily support the rails 4 to ensure train passage during non-maintenance window periods;

[0056] S3: The folded rail plate 1 is transported to the site within the skylight point, and the temporary support for the rail 4 is removed;

[0057] S4: Place the folded rail plate 1 between the two steel rails 4 and gradually unfold it to form a single plate;

[0058] S5: Install the rail 4 onto the rail support platform 11 of the rail support plate 1 using fastener 5;

[0059] S6: After the rail 4 is finely adjusted to the correct position, use bolt 25 to lock the two rail bearing plates 1.

[0060] The above methods also include:

[0061] Quick-setting and early-strength adjustment layer material is injected into the underside of the track slab through the grouting holes 12, forming the adjustment layer 3 under the track slab 1. After solidification, the track bed renovation is completed.

[0062] Most of the structure of this invention is prefabricated and transported to the site in a folded state within the skylight point. It is placed between two steel rails and gradually unfolded, which can significantly reduce the workload and difficulty of updating and maintaining existing ballastless track beds, reduce project investment, and reduce the interference of track bed updates on operations. It has extremely high promotional value.

[0063] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. A track bed structure for updating existing ballastless track beds, characterized in that: The structure includes two rail plates (1) and a connecting hinge (2) between the two rail plates (1), and a row of longitudinally arranged rail platforms (11) is provided on the top of each rail plate (1). The connecting hinge (2) connects the two rail plates (1) together. When unfolded, the two rail plates (1) form a plate body. When folded, the two rail plates (1) are stacked on top of each other. The connecting hinge (2) includes a hinge plate (22) and a rotating shaft (21); The hinge plate (22) is disposed on the inner end face of the bearing plate (1), and a longitudinal shaft tube (224) is disposed at the bottom of the hinge plate (22). The shaft tubes (224) of the hinge pieces (22) of the two bearing plates (1) are longitudinally staggered front and back and longitudinally coaxial, and the rotating shaft (21) is inserted into all the shaft tubes (224). The hinge plate (22) is L-shaped and includes a vertical plate (221) and a bottom plate (222). The vertical plate (221) is embedded in the inner end face of the rail plate (1), and the bottom plate (222) is embedded in the inner bottom face of the rail plate (1). The outer side of the vertical plate (221) is provided with a horizontal anchor (23), which is embedded in the rail bearing plate (1); The hinge plate (22) is provided with a connecting hole plate (223) at its top, and the connecting hole plate (223) is located on the inner top surface of the bearing plate (1); The connecting hole plate (223) is provided with a transverse connecting hole (24). The connecting hole plates (223) of the hinge pieces (22) of the two bearing plates (1) are connected to each other, and the two connecting holes (24) are transversely connected and connected to each other by inserting bolts (25).

2. The track bed structure for updating existing ballastless track beds according to claim 1, characterized in that: The structure also includes an adjustment layer (3) located below the rail plate (1).

3. The track bed structure for updating existing ballastless track beds according to claim 2, characterized in that: The rail plate (1) is provided with vertically penetrating grouting holes (12) for pouring the adjustment layer (3).

4. The track bed structure for updating existing ballastless track beds according to claim 3, characterized in that: The outer side of the rail plate (1) is provided with transverse fine-tuning bolt holes (13).

5. The construction method for the track bed structure used for the renewal of existing ballastless track beds as described in claim 4, characterized in that: The method includes: Prefabricated rail plate (1), with a pre-set connecting hinge (2) between two rail plates (1) and the rail plate (1) folded. Remove the existing ballastless track bed bearing plate and temporarily support the rail (4). The folded rail plate (1) was transported to the site, and the temporary support of the rail (4) was removed. Place the folded rail plate (1) between the two steel rails (4) and gradually unfold it to form a single plate; The rail (4) is installed onto the rail support platform (11) of the rail support plate (1) by means of fastener (5); After the rail (4) is finely adjusted to the correct position, the two rail bearing plates (1) are locked in place using bolts (25).

6. The construction method for the track bed structure for the renewal of existing ballastless track bed according to claim 5, characterized in that: The method further includes: Adjustment layer material is injected under the rail plate (1) through the grouting hole (12) to form an adjustment layer (3) under the rail plate (1).

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