Light overhead roadbed structure

Abstract

The utility model discloses a light overhead roadbed structure which comprises an upper main body structure, the upper main body structure is in a segment type, an expansion joint is arranged between the adjacent upper main body structures in the line direction, the lower end of the upper main body structure is provided with a joist structure connected with the upper main body structure, and the joist structure is supported by a pile structure. And thick broken stone hardcore layers in contact with the upper main body structure are further paved between the beam structures. The middle of the overhead roadbed structure is hollow, the overhead roadbed structure has the advantages of being small in filler amount, light in weight, small in soil body additional stress and capable of remarkably reducing post-construction settlement caused by the additional stress. The overhead roadbed structure is small in structural size in the cross section direction, has the advantage of being small in occupied area, and can save land. The overhead roadbed structure adopts a foundation form of the joists and the cast-in-situ bored piles, has the characteristics of high stability and strong lateral deformation resistance, and is safe and reliable in structure.

Description

Technical Field

[0001] This utility model belongs to the field of roadbed structure construction, specifically relating to a lightweight elevated roadbed structure. Background Technology

[0002] High-speed railways are characterized by high operational density, high operating speeds, and high requirements for passenger comfort, necessitating lines with high smoothness and stability. As a crucial component of the subgrade infrastructure, the roadbed engineering requires higher standards and requirements for structural design to ensure track smoothness and stability. Post-construction settlement control is fundamental to ensuring the smoothness of high-speed railway lines and the safe operation of trains; high-speed railway engineering requires that post-construction roadbed settlement not exceed 15mm.

[0003] Currently, my country's traditional railway subgrade adopts a trapezoidal shape, with shoulders on both sides sloping down to the ground at a certain rate, and ground treatment and reinforcement measures are implemented. This traditional subgrade structure has the advantages of convenient construction and strong applicability; however, because this subgrade structure uses fill material, it increases the width of the land and the additional load, directly leading to an expansion of the ground treatment area and a deeper ground reinforcement depth, thus significantly increasing the project investment. For high-fill subgrades, the additional stress brought by the fill is too great, which is not conducive to controlling post-construction settlement and poses hidden dangers to later operation and maintenance. Traditional subgrade structures require a large amount of qualified fill material, but fill material is scarce in my country's plains areas, and the long transportation distance leads to continuous price increases. At the same time, the excavation and transportation of fill material poses considerable challenges to environmental protection and soil and water conservation.

[0004] Therefore, there is an urgent need to research a new type of lightweight structure to replace traditional roadbed fill material, solve the problem of fill material scarcity and long transportation distance, and at the same time reduce the problem of excessive settlement caused by the large additional stress on the roadbed. Summary of the Invention

[0005] This utility model is proposed to solve the problems existing in the prior art, and its purpose is to provide a lightweight elevated roadbed structure.

[0006] The technical solution of this utility model is: a lightweight elevated roadbed structure, including an upper main structure, the upper main structure being segmented, expansion joints being provided between adjacent upper main structures along the route, a supporting beam structure connected to the lower end of the upper main structure, the supporting beam structure being supported by a pile structure, and a thick crushed stone cushion layer in contact with the upper main structure being laid between the beam structures.

[0007] Furthermore, the upper main structure includes a bottom plate at the bottom and a top plate at the top, with a central wall in the middle and side walls on both sides providing support and connection between the bottom plate and the top plate.

[0008] Furthermore, the bottom plate below the side wall is fixed to the side support beam in the support beam structure by overlapping.

[0009] Furthermore, the base plate below the central wall is fixed to the central support beam in the support beam structure by a rigid connection.

[0010] Furthermore, a rectangular sleeve is provided in the bottom plate below the side wall, and a pre-embedded steel bar protruding from the upper end of the side support beam is provided in the side support beam, and the pre-embedded steel bar of the side support beam is aligned and inserted into the rectangular sleeve.

[0011] Furthermore, a sliding layer is provided between the lower end of the base plate and the upper end of the side support beam. The sliding layer is made of high-strength extruded polystyrene board to ensure the stability of sliding within the small strain range of the structure.

[0012] Furthermore, the bottom plate below the central wall is provided with embedded steel bars for the central wall, and the central support beam is provided with embedded steel bars for the central support beam. The embedded steel bars for the central wall extend downward and are inserted into the central support beam for integral casting.

[0013] Furthermore, the pile structure includes a central pile located at the central support beam position and side piles located at the side support beam positions.

[0014] Furthermore, a base bed surface layer is provided on the top plate, and a track structure is provided on the base bed surface layer.

[0015] The beneficial effects of this utility model are as follows:

[0016] The present invention features an overhead roadbed structure with a hollow center, requiring less fill material and exhibiting light weight. This results in less additional stress on the soil and significantly reduces post-construction settlement caused by additional stress.

[0017] The cross-sectional dimensions of this utility model's elevated roadbed structure are relatively small, resulting in a small footprint and saving land.

[0018] This utility model of an elevated roadbed structure adopts a foundation form of beam support + bored piles, which has the characteristics of high stability and strong resistance to lateral deformation, and the structure is safe and reliable.

[0019] This utility model of an elevated roadbed structure is convenient and fast to construct, which can further save construction time and also has the advantages of being green and environmentally friendly. Attached Figure Description

[0020] Figure 1 This is a schematic cross-sectional view of the elevated roadbed structure of this utility model;

[0021] Figure 2 This is a longitudinal section schematic diagram of the elevated roadbed structure of this utility model;

[0022] Figure 3 This is a schematic diagram of the overlap between the bottom plate and the supporting beam in this utility model;

[0023] Figure 4 This is a schematic diagram of the anchorage between the bottom plate and the supporting beam in this utility model;

[0024] Wherein: 1—Top slab; 2—Bottom slab; 3—Side wall; 4—Middle wall; 5—Sliding layer; 6—Side support beam; 7—Middle support beam; 8—Side pile; 9—Middle pile; 10—PVC drainage pipe; 11—Battery retaining wall; 12—Subgrade surface layer; 13—Cable trough; 14—Guardrail; 15—Walkway; 16—Drainage ditch; 17—Track structure; 18—Foundation; 19—Expansion joint; 20—Thick crushed stone cushion layer; 21—Rectangular sleeve; 22—Embedded steel bars in side support beam; 23—Embedded steel bars in middle wall; 24—Embedded steel bars in middle support beam. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0026] like Figures 1 to 4 As shown, a lightweight elevated roadbed structure includes an upper main structure, which is segmented. Expansion joints 19 are provided between adjacent upper main structures along the route. A supporting beam structure connected to the lower end of the upper main structure is provided. The supporting beam structure is supported by a pile structure. A thick crushed stone cushion layer 20 in contact with the upper main structure is also laid between the beam structures.

[0027] The upper main structure includes a bottom plate 2 at the bottom and a top plate 1 at the top. A central wall 4 and side walls 3 on both sides are provided between the bottom plate 2 and the top plate 1 to support and connect them.

[0028] The bottom plate 2 below the side wall 3 is fixed to the side support beam 6 in the support beam structure by overlapping.

[0029] The base plate 2 below the central wall 4 is fixed to the central support beam 7 in the support beam structure by a rigid connection.

[0030] A rectangular sleeve 21 is provided in the bottom plate 2 below the side wall 3, and a side support beam 6 is provided with a side support beam embedded steel bar 22 protruding from its upper end. The side support beam embedded steel bar 22 is aligned and inserted into the rectangular sleeve 21.

[0031] A sliding layer 5 is also provided between the lower end of the base plate 2 and the upper end of the side support beam 6. The sliding layer 5 is made of high-strength extruded polystyrene board to ensure the stability of sliding within the small strain range of the structure.

[0032] The bottom plate 2 below the central wall 4 is provided with embedded steel bars 23 for the central wall, and the central support beam 7 is provided with embedded steel bars 24 for the central support beam. The embedded steel bars 23 for the central wall extend downward and are inserted into the central support beam 7 for integral casting.

[0033] The pile structure includes a central pile 9 located at the position of the central support beam 7 and a side pile 8 located at the position of the side support beam 6.

[0034] A base bed surface layer 12 is provided on the top plate 1, and a track structure 17 is provided on the base bed surface layer 12.

[0035] In one embodiment, the main structure is a three-hole section, including a top plate 1, a bottom plate 2, two side walls 3 and two middle walls 4; correspondingly, the two side walls 3 are connected to the side support beams 6 below, and the two middle walls 4 are fixedly connected to the middle support beams 7 below.

[0036] Specifically, the main reinforcement bars inside the side piles 8 and the middle piles 9 are extended into the reinforced concrete of the side support beams 6 and the middle support beams 7, respectively, so that they are connected and the upper load is better transferred to the lower foundation 18.

[0037] Specifically, the top slab 1, bottom slab 2, side walls 3 and middle walls 4 are made of reinforced concrete, and corresponding longitudinal bars and stirrups are provided to meet the structural stress and crack width requirements.

[0038] Specifically, the exposed portion of the pre-embedded reinforcing steel bars 22 in the side support beam is treated with rust prevention.

[0039] Specifically, a PVC drainage pipe 10 is provided on the inner side of the side wall 3. The PVC drainage pipe 10 is connected to the drainage ditch 16 provided along the line direction to ensure smooth drainage of the structure.

[0040] Specifically, the expansion joint 19 is filled with asphalt fiberboard to reduce the adverse effects of temperature and shrinkage creep within the structure.

[0041] Specifically, a base bed surface layer 12 is provided on the top plate 1, using qualified graded crushed stone filler to reduce the additional dynamic stress and fatigue effect of the high-speed train on the structure.

[0042] Specifically, cantilever retaining walls 11 are provided on both sides of the top slab 1, and the retaining walls 11 are used to support the surface layer 12 of the slope-reducing foundation bed.

[0043] Specifically, the retaining wall 11 is also equipped with railings 14, which ensure the safety of operation and maintenance personnel.

[0044] Specifically, the lightweight elevated roadbed can be adapted to different geological conditions and its versatility can be ensured by adjusting the height of the side walls 3 and the middle walls 4, the diameter of the side piles 8 and the middle piles 9, the pile spacing, and the pile length.

[0045] Specifically, the base plate 2 is provided with guardrails 15 on both sides, and the drainage ditch 16 is located outside the guardrails 15.

[0046] Specifically, the segmental main structure significantly improves the spatial stiffness of the load-bearing structure, controls the deflection and displacement of the structure in the vertical and horizontal directions, improves the natural frequency of the structure, and enhances the comfort of train operation. Simultaneously, under seismic conditions, the improved overall spatial box-type structure also provides better seismic performance, reducing the impact of earthquakes on railway operation.

[0047] Specifically, the side piles 8 and the center piles 9 are both buried in the soil, and only need to provide vertical bearing capacity, without increasing the pile diameter, which is economical.

[0048] Specifically, the subgrade surface layer 12 filler layer can effectively alleviate the dynamic stress during train operation and reduce the impact of dynamic stress on the service life of concrete structures. At the same time, the existence of the subgrade surface layer 12 filler layer also provides space for rectification and adjustment during the later operation period of the structure.

[0049] A construction method for a lightweight elevated roadbed structure includes the following steps:

[0050] A. Determine the pile manufacturing process, locate the pile structure position, and construct the bored pile;

[0051] B. Level the site and construct the supporting beam structure;

[0052] C. Construct the base slab 2, top slab 1, side walls 3, and central walls 4;

[0053] D. Construction of the substrate surface layer;

[0054] E. Construction of other ancillary structures.

[0055] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 lightweight overhead substructure characterized by: It includes an upper main structure, which is segmented, with expansion joints (19) between adjacent upper main structures along the line direction. The lower end of the upper main structure is provided with a supporting beam structure connected to it, which is supported by a pile structure. A thick crushed stone cushion layer (20) is also laid between the beam structures to contact the upper main structure.

2. A lightweight overhead substructure according to claim 1, wherein: The upper main structure includes a bottom plate (2) at the bottom and a top plate (1) at the top. A central wall (4) and side walls (3) are provided between the bottom plate (2) and the top plate (1) to support and connect them.

3. A lightweight overhead substructure according to claim 2, wherein: The bottom plate (2) below the side wall (3) is fixed to the side support beam (6) in the support beam structure by overlapping.

4. A lightweight overhead substructure according to claim 2, wherein: The bottom plate (2) below the middle wall (4) is fixed to the middle support beam (7) in the support beam structure by a rigid connection.

5. A lightweight overhead substructure according to claim 3, wherein: A rectangular sleeve (21) is provided in the bottom plate (2) below the side wall (3), and a side support beam (6) is provided with a side support beam pre-embedded steel bar (22) protruding from its upper end. The side support beam pre-embedded steel bar (22) is aligned and inserted into the rectangular sleeve (21).

6. A lightweight overhead substructure according to claim 5, wherein: A sliding layer (5) is also provided between the lower end of the base plate (2) and the upper end of the side support beam (6). The sliding layer (5) is made of high-strength extruded polystyrene board to ensure the stability of sliding within the small strain range of the structure.

7. A lightweight overhead substructure according to claim 4, wherein: The bottom plate (2) below the middle wall (4) is provided with embedded steel bars (23) for the middle wall, and the middle support beam (7) is provided with embedded steel bars (24) for the middle support beam. The embedded steel bars (23) for the middle wall extend downward and are inserted into the middle support beam (7) for integral casting.

8. A lightweight overhead substructure according to claim 2, wherein: The pile structure includes a central pile (9) located at the position of the central support beam (7) and a side pile (8) located at the position of the side support beam (6).

9. A lightweight overhead substructure according to claim 2, wherein: A base bed surface layer (12) is provided on the top plate (1), and a track structure (17) is provided on the base bed surface layer (12).

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