Highway roadbed bearing structure

Abstract

The utility model relates to the technical field of highways, and discloses a highway subgrade bearing structure which comprises a soil base layer, a stone base layer and an asphalt surface layer, the stone base layer is arranged on the upper surface of the soil base layer, and the asphalt surface layer is arranged on the upper surface of the stone base layer; the soil base layer comprises a stable soil layer, a limestone layer and a cement layer, the limestone layer is arranged on the upper surface of the stable soil layer, and the cement layer is arranged on the upper surface of the limestone layer; the stone base layer comprises a cement macadam layer and a cement gravel layer, and the cement gravel layer is arranged on the upper surface of the cement macadam layer; the asphalt surface layer comprises a lower surface layer, a middle surface layer and an upper surface layer, the lower surface layer, the middle surface layer and the upper surface layer are sequentially laid from bottom to top, the lower surface layer adopts a coarse grain type modified asphalt layer, the middle surface layer adopts a medium grain type modified asphalt layer, and the upper surface layer adopts a fine grain type modified asphalt layer. According to the utility model, the soil, the stone and the asphalt material are combined, so that the density and the structural strength of the roadbed are improved, the bearing capacity of the roadbed is improved, and the service life of a road is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of highway technology, and in particular to a highway subgrade bearing structure. Background Technology

[0002] Highways are transportation roads built between cities and villages according to national technical standards. In the construction of highways, the roadbed is one of the most critical parts. A stable roadbed can give the highway a better load-bearing capacity.

[0003] Existing highway subgrades employ traditional paving structures, with the bottom layer constructed from relatively simple materials that lack density and structural strength. This limits the load-bearing capacity of the bottom layer, thus affecting the highway's load-bearing capacity and shortening its service life. Therefore, a new highway subgrade load-bearing structure is proposed. Utility Model Content

[0004] The purpose of this utility model is to solve the problem of poor load-bearing capacity of existing highway subgrade load-bearing structures, and to propose a highway subgrade load-bearing structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A roadbed bearing structure includes a soil base course, a stone base course, and an asphalt surface course. The stone base course is disposed on the upper surface of the soil base course, and the asphalt surface course is disposed on the upper surface of the stone base course. The soil base course includes a stabilized soil layer, a limestone layer, and a cement layer. The limestone layer is disposed on the upper surface of the stabilized soil layer, and the cement layer is disposed on the upper surface of the limestone layer. The stone base course includes a cement-aggregate layer and a cement-gravel layer. The cement-gravel layer is disposed on the upper surface of the cement-aggregate layer. The asphalt surface course includes a lower layer, an intermediate layer, and a upper layer, which are laid sequentially from bottom to top. The lower layer uses a coarse-grained modified asphalt layer, the intermediate layer uses a medium-grained modified asphalt layer, and the upper layer uses a fine-grained modified asphalt layer.

[0007] Preferably, the thickness of the soil base layer is 20cm, and the ratio of the stabilized soil layer, limestone layer and cement layer is 21:3:1.

[0008] Preferably, the thickness of both the cement-aggregate layer and the cement-gravel layer is 19 cm, the cement-aggregate ratio of the cement-aggregate layer is 2:45, and the cement-gravel ratio of the cement-gravel layer is 1:18.

[0009] Preferably, cross-shaped reinforcing bars are evenly distributed inside the cement crushed stone layer and the cement gravel layer.

[0010] Preferably, the specifications of the bottom layer, the middle layer, and the top layer are AC-25C, AC-16C, and AC-13C, respectively.

[0011] Preferably, an oil-adhesive layer is provided between the lower layer, the middle layer and the upper layer.

[0012] Compared with the prior art, this utility model provides a highway subgrade bearing structure with the following advantages:

[0013] 1. The roadbed bearing structure of this highway, through the construction of a soil base course, a stone base course, and an asphalt surface course, combines soil, stone, and asphalt materials. Furthermore, the soil base course, stone base course, and asphalt surface course are composed of corresponding stabilized soil layers, limestone layers, cement layers, cement-aggregate layers, cement-gravel layers, and modified asphalt layers of different grades, which increases the structural density and strength of the roadbed, thereby improving the bearing capacity of the roadbed and extending the service life of the highway.

[0014] 2. The roadbed bearing structure of this highway uses cross-shaped reinforcing bars set inside the cement crushed stone layer and cement gravel layer. The cross-shaped reinforcing bars can not only stabilize the cement crushed stone or cement gravel together, but also increase the structural strength of the cement crushed stone layer and cement gravel layer, thereby improving the bearing capacity of the highway.

[0015] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This utility model combines soil, stone and asphalt materials, which increases the density and structural strength of the roadbed, improves the bearing capacity of the roadbed, and thus extends the service life of the highway. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a highway subgrade bearing structure proposed in this utility model;

[0017] Figure 2 for Figure 1 Schematic diagram of the structure of the intermediate soil base layer;

[0018] Figure 3 for Figure 1 A schematic diagram of the structure of the cement-aggregate layer.

[0019] In the diagram: 1. Soil base layer; 11. Stabilized soil layer; 12. Limestone layer; 13. Cement layer; 2. Stone base layer; 21. Cement-aggregate layer; 22. Cement-gravel layer; 23. Cross-shaped reinforcing steel; 3. Asphalt surface layer; 31. Lower layer; 32. Middle layer; 33. Upper layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0021] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", 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 utility model 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 utility model.

[0022] Reference Figure 1 A roadbed bearing structure includes an earth base course 1, a stone base course 2, and an asphalt surface course 3. The stone base course 2 is set on the upper surface of the earth base course 1, and the asphalt surface course 3 is set on the upper surface of the stone base course 2, combining soil, stone, and asphalt materials to form a roadbed. The earth base course 1, stone base course 2, and asphalt surface course 3 are laid sequentially from bottom to top.

[0023] Reference Figure 1-2 The soil base 1 includes a stabilized soil layer 11, a limestone layer 12, and a cement layer 13. The limestone layer 12 is placed on the upper surface of the stabilized soil layer 11, and the cement layer 13 is placed on the upper surface of the limestone layer 12. The thickness of the soil base 1 is 20cm. The ratio of the stabilized soil layer 11, the limestone layer 12, and the cement layer 13 is 21:3:1. The stabilized soil layer 11 is in contact with the ground, and then the limestone layer 12 and the cement layer 13 are laid on top, which can form a strong soil base 1, and the soil base 1 has a strong adhesion to the ground.

[0024] Reference Figure 1 and 3 The base course 2 includes a cement-aggregate layer 21 and a cement-gravel layer 22. The cement-gravel layer 22 is placed on the upper surface of the cement-aggregate layer 21. The thickness of both the cement-aggregate layer 21 and the cement-gravel layer 22 is 19cm. The ratio of cement to aggregate in the cement-aggregate layer 21 is 2:45, and the ratio of cement to gravel in the cement-gravel layer 22 is 1:18. After the cement and aggregate ratios are selected, they are mixed to form a dense structural layer. Cross-shaped reinforcing steel bars 23 are evenly distributed inside the cement-aggregate layer 21 and the cement-gravel layer 22. The cross-shaped reinforcing steel bars 23 can not only stabilize the cement-aggregate or cement-gravel layers together, but also increase the structural strength of the cement-aggregate layer 21 and the cement-gravel layer 22, thereby improving the load-bearing capacity of the highway.

[0025] Reference Figure 1The asphalt surface layer 3 includes a lower layer 31, a middle layer 32, and a top layer 33, which are laid sequentially from bottom to top. The lower layer 31 uses a coarse-grained modified asphalt layer, the middle layer 32 uses a medium-grained modified asphalt layer, and the top layer 33 uses a fine-grained modified asphalt layer. The specifications of the lower layer 31, the middle layer 32, and the top layer 33 are AC-25C, AC-16C, and AC-13C, respectively. An adhesive layer is provided between the lower layer 31, the middle layer 32, and the top layer 33. The adhesive layer can bond the lower layer 31, the middle layer 32, and the top layer 33 together, and the different grades of the lower layer 31, the middle layer 32, and the top layer 33 will significantly improve the stability of the road surface and reduce the deformation and cracking of the road surface.

[0026] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A roadbed bearing structure, comprising an earthen base course (1), a stone base course (2), and an asphalt surface course (3), characterized in that, The stone base layer (2) is disposed on the upper surface of the soil base layer (1), and the asphalt surface layer (3) is disposed on the upper surface of the stone base layer (2); The soil base (1) includes a stabilized soil layer (11), a limestone layer (12) and a cement layer (13). The limestone layer (12) is disposed on the upper surface of the stabilized soil layer (11), and the cement layer (13) is disposed on the upper surface of the limestone layer (12). The stone base layer (2) includes a cement crushed stone layer (21) and a cement gravel layer (22), wherein the cement gravel layer (22) is disposed on the upper surface of the cement crushed stone layer (21); The asphalt surface layer (3) includes a lower layer (31), a middle layer (32) and a top layer (33), which are laid in sequence from bottom to top. The lower layer (31) is a coarse-grained modified asphalt layer, the middle layer (32) is a medium-grained modified asphalt layer, and the top layer (33) is a fine-grained modified asphalt layer.

2. The roadbed bearing structure according to claim 1, characterized in that, The thickness of the soil base (1) is 20cm, and the ratio of the stabilized soil layer (11), limestone layer (12) and cement layer (13) is 21:3:

1.

3. The roadbed bearing structure according to claim 1, characterized in that, The thickness of the cement-aggregate layer (21) and the thickness of the cement-gravel layer (22) are both 19 cm. The ratio of cement to aggregate in the cement-aggregate layer (21) is 2:45, and the ratio of cement to gravel in the cement-gravel layer (22) is 1:

18.

4. The roadbed bearing structure according to claim 1, characterized in that, Cross-shaped reinforcing bars (23) are evenly distributed inside the cement crushed stone layer (21) and the cement gravel layer (22).

5. A highway subgrade bearing structure according to claim 1, characterized in that, The specifications of the bottom layer (31), the middle layer (32) and the top layer (33) are AC-25C, AC-16C and AC-13C, respectively.

6. A highway subgrade bearing structure according to claim 1, characterized in that, An oil-adhesive layer is provided between the lower layer (31), the middle layer (32), and the upper layer (33).

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