Replacement-free ribbed slab culvert section structure in railway added second-line high roadbed

Abstract

The utility model relates to the field of railway construction, and discloses a replacement-free ribbed slab culvert section structure in a railway second-line-increasing high roadbed, which comprises a common slab culvert section and a ribbed slab culvert section, pile foundations are arranged on both sides of the common slab culvert section, and the surfaces of roadbed protection piles and retaining walls on the outer sides of wing walls of the common slab culvert block second-line-increasing side roadbed earthwork. L-shaped top beams are erected at the top ends of the pile foundations. In the utility model, the large-span cover plate is arranged at the existing common cover plate culvert section to span the existing culvert, the load of the train is completely borne by the large-span cover plate, and the filled soil of the high roadbed is borne by the protective piles, so that the existing common cover plate section on the second-line-increasing side does not bear the load of the high filled soil and the train any more; a common cover plate section under the existing line does not need to be replaced by a ribbed slab culvert section through heavy excavation of an existing roadbed, the construction method is simple and convenient, interference to the existing line is small, the manufacturing cost is low, and reference is provided for future similar problems.

Description

Technical Field

[0001] This utility model relates to the field of railway construction, and in particular to a culvert section structure for high-grade subgrade of a railway second line that does not require replacement of rib plate sections. Background Technology

[0002] When the embankment height of a railway subgrade is between 7m and 40m, ribbed culverts are generally used at high embankment locations, while ordinary slab culverts are used at entrances and exits where the embankment height is below 6m to 8m. When adding a second track to an existing railway, ordinary slab culverts cannot meet the stress requirements of high embankments in high subgrades, and must be replaced with ribbed culverts. During construction, protective measures must be taken for the existing railway to ensure its operational safety during large-scale excavation and replacement of slab culverts, or the railway may be diverted to a temporary line to ensure safety.

[0003] In the construction of the second railway line, the culvert structure in the high subgrade section plays a crucial role in ensuring railway operation safety, smooth drainage, and subgrade stability.

[0004] Existing railway protection measures typically include D24 type construction temporary beams, combined temporary beams, and longitudinal and transverse I-beams. However, when the fill height exceeds 10m, both D24 type construction temporary beams and combined temporary beams require multi-span continuous beam protection. High piers less than 2.3m from the track center are difficult to construct under existing lines, compromising safety. Longitudinal and transverse I-beam protection, due to the excessively high subgrade and large protection area, cannot meet the requirements for large excavation spans during construction and significantly interferes with the existing line, still compromising safety. Furthermore, temporary line operation requires land acquisition and demolition, resulting in substantial investment. Therefore, this paper proposes a culvert structure for a second railway line with a high subgrade that eliminates the need for replacing ribbed culvert sections to address these issues. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a ribbed culvert structure for the elevated roadbed of the second railway line that does not require replacement. It aims to improve the existing technology where the construction of high support piers under existing lines is difficult and safety cannot be guaranteed; and the longitudinal and transverse I-beam protection is too high and the protection range is too large, which cannot meet the requirements of large excavation spans during construction, and also causes great interference to the existing lines, so safety cannot be guaranteed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a rib culvert section structure for a railway second-track elevated roadbed that does not require replacement, comprising a common culvert section and a rib culvert section. Both sides of the common culvert section are provided with pile foundations, and the top of each pile foundation is provided with an L-shaped cap beam. The side wall of the top of the L-shaped cap beam is provided with a large-span cap plate.

[0007] As a further description of the above technical solution:

[0008] The shoulder surface of the Zeng Er Line is equipped with roadbed protection piles to block the roadbed soil. Retaining walls are set at the ends of the existing culvert wing walls to block the slope soil of Zeng Er Line. Transition blocks are set on the outer side of the large-span culvert on the roadbed surface.

[0009] As a further description of the above technical solution:

[0010] The surface of the roadbed protection piles and the retaining wall on the outside of the ordinary culvert wing wall both block the earthwork of the roadbed on the side of the second line.

[0011] As a further description of the above technical solution:

[0012] Protective cones are installed on the water-facing side of the retaining wall to ensure the stability of the roadbed soil.

[0013] As a further description of the above technical solution:

[0014] The top of the roadbed protection piles is connected by a straight cap beam.

[0015] As a further description of the above technical solution:

[0016] A gap is provided between the large-span cover plate and the L-shaped crown beam.

[0017] As a further description of the above technical solution:

[0018] The height of the large-span culvert is located at the top of the ordinary culvert section.

[0019] As a further description of the above technical solution:

[0020] The height of the large-span cover plate shall not exceed that of the original railway shoulder.

[0021] This utility model has the following beneficial effects:

[0022] 1. In this utility model, by setting a large-span cover plate across the existing culvert section at the existing ordinary cover plate culvert section, the train load is entirely borne by the large-span cover plate, and the high roadbed fill is borne by the protective piles. This satisfies the requirement that the existing ordinary cover plate section on the side of the second line no longer bears the high fill and train load, and there is no need to excavate the existing roadbed to replace the ordinary cover plate section under the existing line with a rib culvert section. The construction method is simple, has little interference with the existing line, and is low in cost, providing a reference for similar problems in the future.

[0023] 2. In this utility model, the synergistic effect of the retaining wall and the roadbed protection pile enhances the stability of the soil around the culvert structure and prevents uneven settlement from damaging the culvert structure. This stable structural design ensures that the culvert can operate reliably for a long time in a complex mechanical environment, protects the safety of railway operation, and provides a solid guarantee for the normal operation of the second railway line. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall elevation structure of a culvert section structure in an elevated roadbed of a railway second-track project that does not require replacement of rib plates.

[0025] Figure 2 This utility model presents a schematic diagram of the pile foundation, L-shaped cap beam, and large-span cover plate of a railway culvert structure that does not require replacement of ribbed culvert sections in the elevated roadbed of a second railway line.

[0026] Figure 3 This utility model presents a plan view of a roadbed protection pile and a large-span cover plate for a railway second-track elevated roadbed structure that does not require replacement of rib plate culvert sections.

[0027] Legend:

[0028] 1. Large-span culvert; 2. Pile foundation; 3. L-shaped cap beam; 4. Ribbed culvert section; 5. Ordinary culvert section; 6. Roadbed protection pile; 7. Transition block; 8. Retaining wall. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Reference Figure 1 - Figure 3 This utility model provides an embodiment of a ribbed culvert structure for a railway expansion project with an elevated subgrade that does not require replacement. It includes a standard culvert section 5 and a ribbed culvert section 4. Pile foundations 2 are provided on both sides of the standard culvert section 5. An L-shaped cap beam 3 is erected at the top of each pile foundation 2. A large-span culvert 1 is erected on the side wall of the top of the L-shaped cap beam 3. Subgrade protection piles 6 are provided on the shoulder surface of the expansion project to block subgrade soil. The surface of the subgrade protection piles 6 and the retaining wall 8 on the outer side of the standard culvert wing wall both block subgrade soil on the side of the expansion project. Retaining walls 8 are also provided at the ends of the existing culvert wing walls to block slope soil on the expansion project. The large-span culvert section... A transition block 7 is provided on the outer side of the cover plate 1 on the roadbed surface. The pile foundation 2 is set on the outer side of the ordinary cover plate culvert section 5, generally starting from the existing rib culvert 4 and the ordinary cover plate culvert section 5 to the shoulder of the second-line railway. The protective pile 6 is set at the edge of the second-line roadbed. The top of the pile foundation 2 contacts the L-shaped cap beam 3. The top of the protective pile 6 contacts the straight cap beam. The side wall of the top of the L-shaped cap beam 3 contacts the large-span cover plate 1. The height of the large-span cover plate 1 is not higher than the railway shoulder. The height of the large-span cover plate 1 is located at the upper end of the ordinary cover plate culvert section 5. A gap is provided between the large-span cover plate 1 and the L-shaped cap beam 3.

[0031] Reference Figure 2 - Figure 3 The wing wall of the ordinary culvert section 5 is equipped with a retaining wall 8. The water-facing side of the retaining wall 8 is equipped with a protective cone to ensure the stability of the roadbed soil. The retaining wall 8 is connected to the existing culvert wing wall to block part of the roadbed soil on the side of the second line. A 3cm settlement joint is set between the retaining wall 8 and the existing wing wall to prevent structural damage caused by uneven settlement. The top of the roadbed protection pile 6 is connected by a straight cap beam. The cap beam is a "straight" cap beam to connect the top of the roadbed protection pile 6 and enhance the overall stability. The transition block 7 is perpendicular to the railway centerline on one side and is 5.0m wide. The other side is parallel to the L-shaped cap beam 3. The other two sides are parallel to the railway line with the shortest side length of 1.0m. It is set on the second line and plays the role of transition connection.

[0032] Working principle: During construction, step one involves precisely installing 2-12.5m 3-5-3 hanging rail protection at the existing line corresponding to the bored pile foundation, and having a designated person inspect the quality; step two involves constructing the bored pile foundation 2 using specialized equipment, starting from the existing rib culvert 4 and the ordinary culvert section 5 on the outside of the ordinary culvert section 5, controlling the pile distance from the edge of the existing culvert sidewall foundation to be more than 0.5m, and inspecting the quality of each pile after completion; step three involves carefully excavating the location of the new culvert at the top of the existing roadbed, then binding the reinforcing steel bars at the top of the pile according to the design, erecting formwork, pouring the L-shaped cap beam 3, and curing it to the design strength; step four involves constructing bored roadbed protection at the edge of the Zeng Er line roadbed. After pile 6 is completed, a "one-line" capping beam is installed on the top of the pile to ensure integrity. After the strength meets the standard, step five is implemented, and a large crane is used to smoothly lift the prefabricated large-span cover plate 1 onto the L-shaped capping beam 3, accurately controlling the 1cm gap, and then treating the plate joint and waterproofing. According to step six, cap stones and railings are installed above the end cover plate, and transition blocks 7 are accurately set at the new line position. Step seven is carried out to set up retaining walls 8 to connect with the existing culvert wing walls, leaving a 3cm settlement joint to ensure stability. Finally, step eight is carried out to perform subgrade compaction, track laying and cone setting, etc., and the entire construction process of the culvert section without replacement in the high subgrade of the second railway line is completed in strict accordance with relevant requirements.

[0033] Finally, it should be noted that the above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A railway double-line high embankment non-replacement ribbed slab culvert section comprising a common cover slab culvert section (5) and a ribbed slab culvert section (4), characterized in that: The common cover plate culvert section (5) is provided with pile foundation (2) on both sides, the top end of the pile foundation (2) is provided with L-shaped crown beam (3), the side wall of the top end of the L-shaped crown beam (3) is provided with large-span cover plate (1).

2. The replaceable slab-free culvert section in a railway second-line high embankment according to claim 1, characterized in that: The surface of the second line shoulder is provided with roadbed protection pile (6) to block the roadbed earthwork, the end of the wing wall of the common cover plate culvert is provided with retaining wall (8) to block the slope earthwork of the second line, the outside of the large-span cover plate (1) is provided with transition block (7) on the surface of the roadbed.

3. The replaceable slab-free culvert section in a railway second-line high embankment according to claim 2, characterized in that: The surface of the roadbed protection pile (6) and the outside retaining wall (8) of the wing wall of the common cover plate culvert block the roadbed earthwork of the second line.

4. The replaceable slab-free culvert section in a railway second-line high embankment according to claim 2, characterized in that: The water-facing surface of the retaining wall (8) is provided with protection cone to ensure the stability of the roadbed earthwork.

5. The replaceable slab-free culvert section in a railway second-line high embankment according to claim 2, characterized in that: The top end of the roadbed protection pile (6) is connected by using the linear crown beam.

6. The railway bi-line high embankment non-replacement rib slab culvert section according to claim 1, characterized in that: The large-span cover plate (1) is provided with gap between the L-shaped crown beam (3).

7. The railway auxiliary line high embankment non-replacement rib slab culvert section structure according to claim 1, characterized in that: The height of the large-span cover plate (1) is located at the upper end of the common cover plate culvert section (5).

8. The railway auxiliary line high embankment non-replacement rib slab culvert section structure according to claim 1, characterized in that: The height of the large-span cover plate (1) is not higher than the original railway shoulder.

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