CN212316558U - Box type roadbed structure and heavy-duty railway roadbed - Google Patents

Abstract

The utility model provides a box roadbed structure and a heavy-duty railway roadbed, wherein the box roadbed structure comprises a bottom plate, a top plate, a supporting structure and at least two side walls, the side walls are arranged between the bottom plate and the top plate, and the bottom plate, the top plate and the side walls form a hollow box body; the supporting structure comprises at least one inclined supporting plate which is arranged in the hollow box body to support the top plate. Compared with the traditional trapezoidal filler roadbed structure, the box roadbed structure has the advantages that the rigidity and the strength are greatly improved, the supporting force is more uniform, the occupied area is reduced, the traditional roadbed filler is not needed, the construction is simple and convenient, and the cost is reduced; meanwhile, the box-type roadbed structure can bear larger load, and a local triangular or trapezoidal structure is formed among the inclined supporting plates, the bottom plate, the top plate and the side walls, so that the stability and the bearing capacity of the box-type roadbed structure are improved by 10% -20%.

Description

Box type roadbed structure and heavy-duty railway roadbed

Technical Field

The utility model relates to a road bed engineering technical field, in particular to box roadbed structure and heavy haul railway road bed.

Background

The heavy haul railway is characterized by large axle weight, long train marshalling length and high running density, and the long marshalling train generally has 100-200 sections, so the whole structure of the heavy haul railway bears huge pressure, which causes frequent damage to the heavy haul railway. The defects mainly include rail joint defects, uneven track abrasion deformation and line sinking. Under the impact of a heavy load and a high-density train, the steel rail of the heavy haul railway is seriously abraded, which not only influences the safe operation of a line, but also causes roadbed diseases, and when the roadbed changes, the track structure of the heavy haul railway also changes accordingly. At present, domestic heavy haul railways cannot meet the requirement of transportation capacity, the bearing capacity of a roadbed is insufficient, roadbed diseases occur frequently, and the design axle load and the speed of a train are severely limited; the increase of the axle weight of the heavy haul railway can obviously increase the load amplitude borne by the roadbed, and the dynamic load frequency borne by the roadbed can be increased by the lifting of the long marshalling train and the train running flow, so that the fatigue damage of the roadbed is aggravated. The existing roadbed line has roadbed damage accounting for more than 20%.

The existing railway road base adopts a trapezoidal form, the upper part of the existing railway road base is the width of a road base surface, the two sides of the existing railway road base adopt side slopes with the ratio of 1: 1.5-2 to be pitched to the ground, different parts of the existing railway road base are subjected to layered rolling treatment by adopting different standards of fillers, and a foundation bed structure with higher requirements is paved on the upper part of the existing railway road base. The trapezoidal roadbed has the advantage of low manufacturing cost, and is a roadbed structure commonly used at home and abroad. However, the trapezoidal structure has the advantages that the occupied area is several times as wide as the road base, and more cultivated land resources are occupied in cultivated land and forest land areas; the exploitation of roadbed filling can also cause the destruction of ecological environment, and is easy to generate secondary geological disasters such as water and soil loss and the like. In addition, the construction process of the layered building and the rolling is greatly influenced by weather change, and the construction quality controllability is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a box roadbed structure and heavy haul railway roadbed to among the solution prior art heavy haul railway bearing capacity is limited and poor stability, road bed area is big, to the technical problem that the filler requires height.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

the utility model provides a box type roadbed structure, which comprises a bottom plate, a top plate, a supporting structure and at least two side walls, wherein the side walls are arranged between the bottom plate and the top plate, and the bottom plate, the top plate and the side walls form a hollow box body; the supporting structure comprises at least one inclined supporting plate, and the inclined supporting plate is arranged in the hollow box body to support the top plate.

Furthermore, one end of at least one inclined supporting plate is fixed on the top plate, and the other end of the inclined supporting plate is fixed on the bottom plate; and/or at least one inclined support plate is fixed on the top plate, and the other end of the inclined support plate is fixed on the side wall.

Furthermore, one end of at least one inclined supporting plate is fixed at the joint of the bottom plate and the side wall; and/or one end of at least one inclined supporting plate is fixed at the joint of the top plate and the side wall.

Furthermore, the supporting structure comprises two inclined supporting plates, one end of each inclined supporting plate is fixed on the bottom plate, the other end of each inclined supporting plate is fixed on the top plate, and the inclined directions of the two inclined supporting plates are different.

Furthermore, one ends of the two inclined supporting plates fixed on the bottom plate are connected with each other; or the two inclined supporting plates are mutually connected at one ends fixed on the top plate.

Furthermore, one end of each of the two inclined supporting plates is fixed at the joint of the bottom plate and the side wall; or one end of each of the two inclined supporting plates is fixed at the joint of the top plate and the side wall.

Furthermore, the box type roadbed structure is made of reinforced concrete.

Further, the box-type roadbed structure comprises a plurality of the support structures, and the support structures are arranged at intervals along the extending direction of the railway.

Further, the size of the top plate in the direction perpendicular to the extension direction of the railway is 10-14 m, the size of the bottom plate in the direction perpendicular to the extension direction of the railway is 6-10 m, and the distance between the side walls is 5-7 m and is smaller than the size of the bottom plate in the direction perpendicular to the extension direction of the railway; and/or the thickness of the top plate is 0.4-0.7 m, the thickness of the bottom plate is 0.6-1.0 m, the thickness of the inclined supporting plate is 0.4-0.8 m, and the thickness of the side wall is 0.6-0.8 m.

Furthermore, box roadbed structure still including set up in two fender tiny fragments of stone, coal, etc. walls on the roof, keep off tiny fragments of stone, coal, etc. walls and follow the extending direction of railway extends, two keep off tiny fragments of stone, coal, etc. walls set up in the roof is along width direction's relative both ends, two keep off tiny fragments of stone, coal, etc. walls parallel interval and set up.

The utility model discloses an on the other hand provides a heavy haul railway roadbed, include a plurality of above-mentioned box roadbed structure and lay in the railway ballast of box roadbed structure's roof upper end is adjacent form the subsiding crack between the box roadbed structure.

Furthermore, the box-type roadbed structure further comprises two ballast blocking walls arranged at the upper end of the top plate, the ballast blocking walls extend along the extending direction of the railway, the two ballast blocking walls are arranged at two opposite ends of the top plate along the width direction, and the two ballast blocking walls are arranged in parallel at intervals; and the railway ballast is paved between the two ballast blocking walls.

Furthermore, the length of the box type roadbed structure along the extension direction of the railway is 8-12 m, and the width of the settlement joint is 18-22 mm.

The utility model provides a box roadbed structure adopts roof, bottom plate and side wall to constitute hollow box structure, and sets up the bearing diagonal board in the hollow box in order to play the supporting role to the roof, compares with traditional trapezoidal packing roadbed structure, and its rigidity and intensity all promote by a wide margin, and the holding power is also more even, and area is reduced, and need not to use traditional roadbed packing, and the construction is simple and convenient, has reduced the cost; meanwhile, the box-type roadbed structure can bear larger load, and a local triangular or trapezoidal structure is formed among the inclined supporting plates, the bottom plate, the top plate and the side walls, so that the stability and the bearing capacity of the box-type roadbed structure are improved by 10% -20%. In addition, the box type roadbed structure is directly placed on the foundation of a railway for use, rigid connection is not formed between the box type roadbed structure and the foundation, the anti-seismic performance is better, and the box type roadbed structure has greater applicability in a high seismic intensity area.

Drawings

Fig. 1 is a schematic cross-sectional structure diagram of a box-type roadbed structure provided by the embodiment of the invention;

FIG. 2 is a schematic view of a modified configuration of FIG. 1;

FIG. 3 is a schematic view of another alternative configuration of FIG. 1;

fig. 4 is a schematic cross-sectional structure view of another box-type roadbed structure provided by the embodiment of the invention;

FIG. 5 is a schematic view of a modified configuration of FIG. 4;

fig. 6 is a schematic structural view of a heavy haul railway roadbed along the railway extending direction provided by the embodiment of the utility model.

Description of reference numerals:

10. a box type roadbed structure; 20. settling seams;

11. a base plate; 12. a top plate; 13. a side wall; 14. an inclined support plate; 15. and a ballast retaining wall.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 5, the embodiment of the present application provides a box-type roadbed structure, which includes a bottom plate 11, a top plate 12, a supporting structure and at least two side walls 13, wherein the side walls 13 are disposed between the bottom plate 11 and the top plate 12, and the bottom plate 11, the top plate 12 and the side walls 13 form a hollow box body; the support structure includes at least one inclined support plate 14, the inclined support plate 14 being disposed within the hollow box to support the top plate 12. That is, the inclined support plates 14 are used to support the roof panel 12 to assist in carrying vertical loads on the roof panel 12. The inclination direction, number, mounting position, and mounting manner of the inclined support plates 14 are not limited as long as they can support the top plate 12. The material of the box-type roadbed structure 10 in the embodiment of the application is reinforced concrete. The concrete can be manufactured by adopting a prefabricated assembly method or a cast-in-place method. Compared with the traditional trapezoid filler roadbed structure, the rigidity and the strength of the roadbed structure are greatly improved. The box type roadbed structure 10 of the embodiment of the application is suitable for the engineering fields of heavy haul railways, special lines and the like.

The box roadbed structure of this application embodiment adopts roof 12, bottom plate 11 and side wall 13 to constitute cavity box structure to set up inclined support plate 14 in the cavity box in order to play the supporting role to roof 12, compare in traditional trapezoidal filler roadbed structure, its rigidity and intensity all promote by a wide margin, and the holding power is also more even, and area reduces, and need not to use traditional roadbed filler, and the construction is simple and convenient, the cost is reduced. Meanwhile, the box-type roadbed structure 10 can bear larger load, and a partial triangular or trapezoidal structure is formed among the inclined supporting plates 14, the bottom plate 11, the top plate 12 and the side walls 13, so that the stability and the bearing capacity of the box-type roadbed structure are improved by 10% -20%. In addition, the box-type roadbed structure 10 is directly placed on the foundation of a railway for use, rigid connection is not formed between the box-type roadbed structure and the foundation, the earthquake resistant performance is better, and the box-type roadbed structure has greater applicability in a high earthquake intensity area.

It will be appreciated that there are many options for the location of the mounting of the inclined support plate 14. In some embodiments, at least one inclined support plate 14 is secured at one end to top plate 12 and at the other end to bottom plate 11. In other embodiments, at least one diagonal support plate 14 is secured to the top plate 12 and the other end is secured to the side wall 13. That is, one end of the inclined supporting plate 14 must be fixed on the top plate 12 to provide auxiliary support for the top plate 12, and the other end can be fixed on the bottom plate 11 or the side wall 13, and preferably, the other end of the inclined supporting plate 14 is fixed on the bottom plate 11, so as to provide a greater supporting force for the top plate 12.

In some embodiments, one end of at least one diagonal support plate 14 is secured to the junction of the floor 11 and the side wall 13. One end of the inclined supporting plate 14 is fixed at the joint of the bottom plate 11 and the side wall 13, the other end of the inclined supporting plate is fixed on the top plate 12, and the top plate 12, the side wall 13 and the inclined supporting plate 14 form a stable triangular structure, so that the stability and the bearing capacity of the top plate 12 are improved. In other embodiments, at least one diagonal support plate 14 is secured at one end to the junction of the top plate 12 and the side wall 13. One end of the inclined support plate 14 is fixed at the joint of the top plate 12 and the side wall 13, and the other end of the inclined support plate is fixed on the bottom plate 11, so that a stable triangular structure is formed among the side wall 13, the bottom plate 11 and the inclined support plate 14, the stability of the box-type roadbed structure 10 is improved, and on the other hand, the inclined support plate 14 also plays a role in supporting the side wall 13 and can be used for assisting the pressure of the side part of the side wall 13 loaded.

Further, at least one inclined support plate 14 has one end fixed to a connection between the bottom plate 11 and the side wall 13 and the other end fixed to a connection between the top plate 12 and the side wall 13. It can be understood that this solution can also support the top plate 12 and the side wall 13; when the inclined support plates 14 are two, the two inclined support plates 14 intersect with each other, and the supporting function can be further enhanced.

In some embodiments, the supporting structure includes two inclined supporting plates 14, each of the two inclined supporting plates 14 has one end fixed to the bottom plate 11 and the other end fixed to the top plate 12, respectively, and the two inclined supporting plates 14 have different inclination directions. The inclined support plates 14 are two in number and different in inclined direction, and can support the top plate 12 in different directions, so that the supporting force borne by the top plate 12 is more uniform, the load of the box-type roadbed structure 10 is improved, and the stability of the box-type roadbed structure is improved. Further, in some embodiments, referring to fig. 1 and 3, two inclined support plates 14 are connected to each other at one end fixed to the bottom plate 11; in other embodiments, and referring to FIG. 4, two diagonal support plates 14 are attached to each other at one end that is secured to the top plate 12. It can be understood that the two inclined supporting plates 14 form a stable triangular structure with the bottom plate 11 or the top plate 12, which can provide a greater supporting force to the top plate 12, so as to improve the stability and bearing capacity of the box-type roadbed structure 10.

Furthermore, one end of each of the two inclined supporting plates 14 is fixed at the joint of the bottom plate 11 and the side wall 13; or two inclined supporting plates 14 are fixed at one end at the joint of the top plate 12 and the side wall 13. One end of the inclined supporting plate 14 is located at the joint of the bottom plate 11 and the side wall 13 or the top plate 12 and the side wall 13, and the inclined supporting plate further provides a supporting effect for the side wall 13 on the basis of increasing the load of the top plate 12 by supporting the top plate 12. Referring to fig. 1 and 4, when at least one end of each of the two inclined support plates 14 is connected to each other and the other end is located at the connection between the bottom plate 11 and the side wall 13 or the connection between the top plate 12 and the side wall 13, three triangular structures are formed in the box-type roadbed structure 10, so that the structure is more stable and the bearing capacity is improved.

As can be understood, referring to fig. 1 and 2, one end of each of the two inclined support plates 14 is located at the joint of the top plate 12 and the side wall 13, and when a load above the top plate 12 applies a downward force to the top plate 12, the supporting force of the inclined support plates 14 on the side wall 13 can be further strengthened. Referring to fig. 4 and 5, one end of each of the two inclined support plates 14 is located at a joint between the bottom plate 11 and the side wall 13, and the side wall 13 can further strengthen the supporting force of the inclined support plates 14 on the top plate 12 against the acting force of the inclined support plates 14 on the inner side of the box-type roadbed structure 10. It can be seen that the two inclined support plates 14 complement and reinforce the top plate 12 and the side wall 13.

In some embodiments, the box-type roadbed structure 10 includes a plurality of support structures that are spaced apart along the direction of extent of the railroad. That is, the plurality of support structures can disperse the load of the roof panel 12, and can further control the deformation of the roadbed while improving the rigidity and strength of the roadbed structure.

In some embodiments, the dimension of the top plate 12 perpendicular to the extension direction of the railway is 10m to 14m, the dimension of the bottom plate 11 perpendicular to the extension direction of the railway is 6m to 10m, and the distance between the side walls 13 is 5m to 7m and is smaller than the dimension of the bottom plate 11 perpendicular to the extension direction of the railway. In the present application, the dimension of the roof panel 12 in the railway extending direction refers to the length dimension of the roof panel 12, and the dimension of the roof panel 12 perpendicular to the railway extending direction refers to the width dimension of the roof panel 12. Likewise, the dimension of the floor 11 in the direction perpendicular to the extension direction of the railway refers to the width dimension of the floor 11. The width dimension of the bottom plate 11 may be less than or equal to the width dimension of the top plate 12, and the smaller the width, the smaller the footprint. The width of the bottom plate 11 is greater than or equal to the distance between the two side walls 13. The width dimension of the top plate 12 is adapted to the width of the railway. Too large a distance between the two side walls 13 increases the floor space, and too small a distance decreases the bearing capacity at the ends of the top deck 12, decreasing the stability of the box-type roadbed structure 10.

In some embodiments, the top plate 12 has a thickness of 0.4m to 0.7m, the bottom plate 11 has a thickness of 0.6m to 1.0m, the inclined support plate 14 has a thickness of 0.4m to 0.8m, and the side wall 13 has a thickness of 0.6m to 0.8 m. It will be appreciated that the roof 12, floor 11, diagonal support plates 14 and side walls 13 are of a thickness sufficient to provide the desired rigidity and strength to the box-type roadbed structure 10. The sizes of the groups are not suitable to be too large so as to avoid the waste of materials and the increase of cost; it is not desirable to be too small to avoid the stiffness and strength being unsatisfactory. The thickness of each structure is reasonably set according to different design loads, the requirement of the heavy haul railway on bearing capacity and the requirement of the foundation on bearing deformation.

Further, box roadbed structure 10 still includes two fender tiny fragments of stone, coal, etc. walls 15 that set up in roof 12 upper end, and fender tiny fragments of stone, coal, etc. walls 15 extends along the extending direction of railway, and two fender tiny fragments of stone, coal, etc. walls 15 set up in roof 12 along width direction's relative both ends, and two fender tiny fragments of stone, coal, etc. walls 15 parallel interval sets up. And a railway ballast is paved between the two ballast retaining walls 15 above the top plate 12, and a sleeper and a steel rail are paved on the railway ballast.

The embodiment of the application also provides a heavy haul railway roadbed, which comprises a plurality of box type roadbed structures 10 and railway ballasts paved on the upper ends of the top plates 12 of the box type roadbed structures 10, wherein settlement joints 20 are formed between the adjacent box type roadbed structures 10, and the reference figure 6 shows that the box type roadbed structures 10 are combined together. The box-type roadbed structure 10 is placed on the foundation of the heavy haul railway. The embodiment of the present application takes a heavy haul railway roadbed as an example to illustrate the application of the box-type roadbed structure 10. The heavy haul railway roadbed of the embodiment of the application comprises a plurality of box type roadbed structures 10, so that the bearing capacity of the heavy haul railway roadbed is greatly improved, and the transport capacity and safe and stable operation of the heavy haul railway are ensured; meanwhile, the land utilization rate is improved. In addition, the box-type roadbed structure 10 is directly placed on the foundation and is in non-rigid connection with the foundation, so that the earthquake-resistant performance is stronger, and the box-type roadbed structure has greater applicability in high earthquake intensity areas.

Further, the box-type roadbed structure 10 further comprises two ballast retaining walls 15 arranged at the upper end of the top plate 12, the ballast retaining walls 15 extend along the extending direction of the railway, the two ballast retaining walls 15 are arranged at the two opposite ends of the top plate 12 along the width direction, and the two ballast retaining walls 15 are arranged in parallel at intervals; the railway ballast is laid between the two ballast retaining walls 15. Railway ballast is filled between the two ballast blocking walls 15, and a sleeper and a steel rail are paved on the railway ballast. The box-type roadbed structure 10 reduces the load borne by the wheel tracks and reduces the deformation and abrasion of the wheel tracks. Further, the length of the box-type roadbed structure 10 along the extension direction of the railway is 8-12 m, and the width of the settlement joint 20 is 18-22 mm.

The application provides above-mentioned box roadbed structure to the low, not enough, the frequent emergence of road bed disease of transporting power, the limited scheduling problem in usable space of partial region of the conventional heavy haul railway bearing capacity. The deformation of the roadbed is effectively controlled, roadbed diseases are reduced, and later maintenance is reduced; the bearing capacity of the roadbed is increased by 10% -20% compared with the traditional roadbed bearing capacity, the lifting of the transport capacity of the heavy haul railway is realized, and the stability and the safety of the heavy haul railway are ensured; the occupied area is reduced, and the resources are saved. Meanwhile, the method has stronger adaptability to high seismic intensity areas. The application of the box type roadbed structure can be widely applied to the engineering fields of heavy haul railways, special lines and the like.

The specific construction mode of the box roadbed structure of this application embodiment is as follows to the construction heavy haul railway roadbed as an example:

1. according to engineering geology, design requirements and environmental factors of a proposed heavy haul railway region, checking calculation of bearing capacity, stability and deformation of the reinforced concrete box type roadbed structure 10 is carried out, and proper concrete models, sizes of structures, arrangement of reinforcing bars and the like are selected. The reinforced concrete model and the arrangement of the reinforcing steel bars can meet the requirements of bearing capacity and durability, and the diameter and the length of the reinforcing steel bars can meet the requirements of minimum reinforcement ratio and anchoring length in construction.

Wherein the width structure size of the top plate 12 is designed to be 10 m-14 m; the width of the bottom plate 11 is designed to be 8.5 m; the height of the side wall 13 is controlled according to the elevation of the foundation and the rail surface, and can be 4-8 m; the distance design of the left side wall and the right side wall adopts 5 m-7 m. The thickness of the top plate 12 is designed to be 0.55m, the thickness of the bottom plate 11 is designed to be 0.8m, the thickness of the left side wall 13 and the thickness of the right side wall 13 are designed to be 0.6m to 0.8m, the thickness of the left inclined support and the right inclined support are designed to be 0.6m, the rectangular cross section of each inclined support plate 14 is 0.8m multiplied by 1.0m, and the box type roadbed structure 10 comprises 2-3 support structures along the extension direction of a railway.

2. And checking and calculating the bearing capacity and deformation of the foundation according to the bottom surface load of the box type roadbed structure 10, and reinforcing the foundation which does not meet the bearing capacity and deformation requirements, such as reinforcing a mixing pile, a CFG pile composite foundation or a tubular pile, so that the foundation meets the standard requirements. In order to be connected with the bridge and the culvert in an effective and direct mode, the transverse width of the reinforced concrete box type roadbed structure 10 is consistent with the arrangement form of the top surfaces of the simply supported beams of the bridge, and the longitudinal length can be considered according to actual conditions.

3. And paving a cushion layer on the surface of the reinforced foundation, wherein the cushion layer consists of broken stones with the thickness of 0.4m and medium coarse sand with the thickness of 0.2m, leveling the foundation, and then starting to pour the reinforced concrete structure or place the prefabricated box type roadbed structure 10.

4. The reinforced concrete box type roadbed structure 10 is constructed in a cast-in-place or prefabricated mode, sections are required to be segmented along the extension direction of a railway in the construction process, the length of each section of box type roadbed structure 10 can be 8-12 m, settlement joints 20 are required to be arranged between the sections, the width of each section of box type roadbed structure is generally 20mm, the width of each section of box type roadbed structure can be adjusted according to actual conditions, and water stopping is arranged in each joint. When each part of the reinforced concrete structure is cast in place, the reinforced concrete structure is gradually cast from bottom to top, the initial setting time is strictly controlled in the casting process, and the construction of the next part can be carried out after the strength of the lower part structure reaches the design requirement.

5. And after the construction is finished, deformation monitoring and quality detection are carried out. After the quality detection is qualified and the deformation meets the standard requirement, filling ballast and paving a track between the ballast retaining walls 15 on the two sides.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Moreover, the technical solutions of the present invention between the various embodiments can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are combined and contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and the present invention is not within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (13)

1. A box roadbed structure, its characterized in that: the side wall is arranged between the bottom plate and the top plate, and the bottom plate, the top plate and the side wall form a hollow box body; the supporting structure comprises at least one inclined supporting plate, and the inclined supporting plate is arranged in the hollow box body to support the top plate.

2. The box-type roadbed structure according to claim 1, wherein at least one of the inclined support plates has one end fixed to the top slab and the other end fixed to the bottom slab; and/or

At least one inclined supporting plate is fixed on the top plate, and the other end of the inclined supporting plate is fixed on the side wall.

3. The box-type roadbed structure according to claim 2, wherein one end of at least one of the inclined support plates is fixed to a connection portion of the bottom plate and the side wall; and/or

One end of at least one inclined supporting plate is fixed at the joint of the top plate and the side wall.

4. The box-type roadbed structure according to claim 1, wherein the supporting structure comprises two inclined supporting plates, one end of each of the two inclined supporting plates is fixed on the bottom plate, the other end of each of the two inclined supporting plates is fixed on the top plate, and the inclination directions of the two inclined supporting plates are different.

5. The box-type roadbed structure according to claim 4, wherein one ends of the two inclined supporting plates fixed on the bottom plate are connected with each other; or the two inclined supporting plates are mutually connected at one ends fixed on the top plate.

6. The box-type roadbed structure according to claim 4, wherein one end of each of the two inclined supporting plates is fixed at the joint of the bottom plate and the side wall; or one end of each of the two inclined supporting plates is fixed at the joint of the top plate and the side wall.

7. The box-type roadbed structure according to any one of claims 1 to 6, wherein the material of the box-type roadbed structure is reinforced concrete.

8. The box-type roadbed structure according to any one of claims 1 to 6, wherein the box-type roadbed structure comprises a plurality of the support structures, and the support structures are arranged at intervals along the extension direction of the railway.

9. The box-type roadbed structure according to any one of claims 1 to 6, wherein the top plate has a dimension of 10m to 14m in a direction perpendicular to the extension direction of the railway, the bottom plate has a dimension of 6m to 10m in a direction perpendicular to the extension direction of the railway, and the distance between the side walls is 5m to 7m and is smaller than a dimension of the bottom plate in a direction perpendicular to the extension direction of the railway; and/or

The thickness of the top plate is 0.4-0.7 m, the thickness of the bottom plate is 0.6-1.0 m, the thickness of the inclined supporting plate is 0.4-0.8 m, and the thickness of the side wall is 0.6-0.8 m.

10. The box-type roadbed structure according to any one of claims 1 to 6, further comprising two ballast retaining walls arranged at the upper end of the top plate, wherein the ballast retaining walls extend along the extension direction of a railway, the two ballast retaining walls are arranged at two opposite ends of the top plate along the width direction, and the two ballast retaining walls are arranged in parallel at intervals.

11. A heavy haul railway roadbed characterized in that, comprises a plurality of box roadbed structures of any claim 1 to 9 and ballast laid on the upper ends of the top plates of the box roadbed structures, and settlement joints are formed between the adjacent box roadbed structures.

12. The heavy haul railway subgrade of claim 11, wherein the box-type subgrade structure further comprises two ballast walls arranged at the upper end of the top plate, the ballast walls extend along the extension direction of the railway, the two ballast walls are arranged at two opposite ends of the top plate along the width direction, and the two ballast walls are arranged in parallel at intervals; and the railway ballast is paved between the two ballast blocking walls.

13. The heavy haul railway subgrade of claim 11, wherein said box-type subgrade structure has a length along the extension direction of the railway of 8-12 m, and said settlement joint has a width of 18-22 mm.

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