Anti-deformation structure of roadbed base layer

Abstract

The utility model discloses an anti-deformation structure of a subgrade base layer, which relates to the technical field of subgrade base layers, is arranged between a base layer and a pavement layer, and is characterized by comprising an anti-compression layer paved above the subgrade base layer, a stress absorption layer paved above the anti-compression layer, and a drainage layer paved above the stress absorption layer, the pavement layer is laid on the drainage layer, a water-proof film is arranged in the drainage layer, and the two ends of the water-proof film extend to cover the side faces of the stress absorption layer and the compression-resistant layer. The drainage layer is arranged, the waterproof films which are obliquely laid from the center to the two sides are arranged in the drainage layer, when water flows downwards through the drainage layer, the water cannot filter the waterproof films, water flows to the waterproof films on the side faces of the two ends wrapping the stress absorption layer and the compression resistance layer under the action of gravity, and the water and the roadbed body are separated through the waterproof films; and erosion of water flow to the roadbed is prevented. By arranging the stress absorption layer, stress can be absorbed, local stress concentration is reduced, and the risk of crack generation is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of subgrade bases, and specifically relates to an anti-deformation structure for a subgrade base. Background Art

[0002] A subgrade is a civil engineering structure formed by excavating or filling soil, which serves as a supporting foundation for railway tracks or road pavements. Its core function is to provide a stable base for track laying and road construction, as well as for train operation or vehicle driving. The design of the subgrade aims to withstand static or dynamic loads from tracks, locomotives, roads, and traffic vehicles, and effectively disperse and transfer these loads to deeper foundations.

[0003] The patent with the publication number CN 214882660 U discloses an environment-friendly crack-resistant and durable road base structure, belonging to the field of road structures. It includes a subgrade bottom layer, a coal gangue layer, a concrete layer, and a subgrade surface layer arranged in sequence from bottom to top. A geogrid is laid between the concrete layer and the coal gangue layer, and a crack-resistant fiber layer is arranged between the concrete layer and the subgrade surface layer.

[0004] The drainage effect of common subgrade base structures is not ideal. Excessive water accumulation is likely to erode the subgrade structure. During long-term use, it cannot effectively prevent subgrade settlement and cracking, resulting in subgrade structure deformation. Therefore, it is necessary to improve the traditional subgrade base structure and design a new type of subgrade base structure with good drainage effect and good anti-deformation ability. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti-deformation structure for a subgrade base to solve the deficiencies in the above-mentioned prior art.

[0006] To achieve the above purpose, the utility model provides the following technical solution: An anti-deformation structure for a subgrade base is arranged between a base layer and a road surface layer. It is characterized in that it includes a compression layer laid above the base layer, a stress absorption layer laid above the compression layer, a drainage layer laid above the stress absorption layer, the road surface layer is laid above the drainage layer, a water isolation film is arranged inside the drainage layer, and both ends of the water isolation film extend to cover the sides of the stress absorption layer and the compression layer.

[0007] Further, the compression layer includes a concrete layer and a fiberglass grille layer connected successively from top to bottom.

[0008] Further, the concrete layer is filled with a steel bar framework.

[0009] Further, the stress absorption layer includes a highly elastic modified asphalt layer and a polypropylene fiber layer connected in an interlocking manner from top to bottom.

[0010] Further, the drainage layer is a geotextile layer.

[0011] Further, the water barrier membrane inside the drainage layer is laid obliquely from the center to both sides.

[0012] Further, the material of the water barrier membrane is high-density polyethylene.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: By providing a drainage layer with a water barrier membrane laid obliquely from the center to both sides inside, when water permeates through the drainage layer and flows downward, it cannot filter through the water barrier membrane. Under the action of gravity, the water flow will flow to the water barrier membranes on the two side faces covering the stress absorption layer and the compression layer. The water flow is separated from the main body of the roadbed through the water barrier membrane, preventing the water flow from eroding the roadbed; By providing a stress absorption layer, the stress generated by vehicle loads and the like can be absorbed, reducing local stress concentration and lowering the risk of crack generation; By providing a compression layer, the bearing capacity of the roadbed can be improved, preventing the roadbed from settling or deforming due to natural reasons or traffic loads. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic diagram of the overall cross-sectional structure provided by the embodiment of the present utility model;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of the roadbed base layer provided by the embodiment of the present utility model;

[0017] Description of the reference numerals:

[0018] 1. Base layer; 2. Compression layer; 3. Stress absorption layer; 4. Drainage layer; 5. Road surface layer; 6. Water barrier membrane; 201. Concrete layer; 202. Glass fiber grille layer; 301. Highly elastic modified asphalt layer; 302. Polypropylene fiber layer. Detailed Embodiments

[0019] In order to enable those skilled in the art to better understand the technical solutions of the present utility model, the following will further introduce the present utility model in detail in conjunction with the drawings.

[0020] Please refer to Figure 1-2, an anti-deformation structure for a roadbed base layer provided by an embodiment of the present utility model is arranged between a base layer 1 and a road surface layer 5. It is characterized in that it includes a compressive layer 2 laid above the base layer 1, a stress absorption layer 3 is laid above the compressive layer 2, a drainage layer 4 is laid above the stress absorption layer 3, the road surface layer 5 is laid above the drainage layer 4, a water barrier film 6 is arranged inside the drainage layer 4, and both ends of the water barrier film 6 extend to cover the sides of the stress absorption layer 3 and the compressive layer 2.

[0021] The compressive layer 2 includes a concrete layer 201 and a glass fiber grid layer 202 connected successively from top to bottom. The concrete layer 201 is filled with a steel bar framework. Through the cooperation of concrete and the steel bar framework. Concrete has relatively high compressive strength, but poor tensile capacity and is prone to fracture due to tensile force. While steel bars have very high tensile strength and can withstand relatively large tensile forces. Adding a steel bar framework to the concrete can bond the two materials into a whole to jointly bear external forces, improve the bearing capacity and durability of the roadbed. The glass fiber grid layer 202 can improve the bearing capacity of the overall structure and disperse the load, reducing damage caused by overloading or uneven loads. The cooperation of the concrete layer 201 and the glass fiber grid layer 202 can prevent the roadbed from settling due to natural reasons or traffic loads, improving the anti-deformation ability of the roadbed base layer structure.

[0022] The stress absorption layer 3 includes a highly elastic modified asphalt layer 301 and a polypropylene fiber layer 302 connected in an interlocking manner from top to bottom. Through the mutual cooperation of the highly elastic modified asphalt layer 301 and the polypropylene fiber layer 302, it can effectively absorb and disperse stresses caused by traffic loads, temperature changes or other factors, reduce stress concentration, lower the risk of crack generation and prevent the expansion of cracks. It can prevent reflection cracks caused by base layer cracks from transferring to the surface layer, maintaining the integrity and beauty of the road surface. By reducing the occurrence and expansion of cracks, it helps to extend the service life of the road surface and improve its durability.

[0023] The material of the drainage layer 4 is geotextile. The water barrier film 6 inside the drainage layer 4 is laid obliquely from the center to both sides. Geotextile has relatively high water permeability. As the drainage layer 4, it can infiltrate moisture onto the water barrier film 6. The material of the water barrier film 6 is high-density polyethylene, which has good water barrier performance. The moisture flows under the action of gravity to the water barrier film 6 covering the two ends of the stress absorption layer 3 and the compressive layer 2. The water barrier film 6 can well separate the water flow from the main body of the roadbed, preventing the water flow from eroding and scouring the roadbed and improving the durability of the roadbed.

[0024] The drainage layer 4, stress absorption layer 3, and compressive layer 2 mentioned above can all be directly completed by prefabricated components produced in the factory. The prefabricated components are produced in the factory environment, which can avoid the influence of natural conditions such as weather on on-site construction and speed up the construction progress. The factory environment is usually easier to control, which is conducive to ensuring the quality and consistency of the prefabricated components. Mass production of prefabricated components can reduce costs and at the same time reduce the labor and time required for on-site construction. Since the prefabricated components have been completed before being transported to the site, the total construction time of the project can be significantly shortened.

[0025] Only some exemplary embodiments of the present invention have been described by way of illustration above. Undoubtedly, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An anti-deformation structure of a roadbed base layer, arranged between a base layer (1) and a pavement layer (5), characterized in that: The invention comprises a pressure-resistant layer (2) laid on top of a base layer (1), a stress-absorbing layer (3) laid on top of the pressure-resistant layer (2), a drainage layer (4) laid on top of the stress-absorbing layer (3), a pavement layer (5) laid on top of the drainage layer (4), a waterproof membrane (6) arranged inside the drainage layer (4), and both ends of the waterproof membrane (6) extending to cover the side surfaces of the stress-absorbing layer (3) and the pressure-resistant layer (2).

2. The anti-deformation structure of the roadbed base according to claim 1, characterized in that: The pressure-resistant layer (2) comprises a concrete layer (201) and a glass fiber grid layer (202) connected from top to bottom.

3. The anti-deformation structure of the roadbed base according to claim 2, characterized in that: The concrete layer (201) is filled with a steel reinforcement skeleton.

4. The anti-deformation structure of the roadbed base according to claim 1, characterized in that: The stress absorbing layer (3) comprises a highly elastic modified asphalt layer (301) and a polypropylene fiber layer (302) which are embedded and connected from top to bottom.

5. The anti-deformation structure of the roadbed base according to claim 1, characterized in that: The drainage layer (4) is a geotextile layer.

6. The anti-deformation structure of the roadbed base according to claim 1, characterized in that: The water-blocking membrane (6) inside the drainage layer (4) is laid obliquely from the center to both sides.

7. The anti-deformation structure of the roadbed base according to claim 1, characterized in that: The material of the water-isolating membrane (6) is high-density polyethylene.

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