An asphalt road base structure

Abstract

This utility model discloses an asphalt roadbed structure, including a roadbed subbase; a crushed stone layer laid on top of the roadbed subbase; a gravel layer laid on top of the crushed stone layer, with gaps between the gravel layers for drainage; a second geotextile layer and a first geotextile layer laid between the roadbed subbase and the crushed stone layer, and between the crushed stone layer and the gravel layer, respectively. The double-layer arrangement of the second and first geotextile layers effectively prevents salt from migrating upwards with water, reducing salt damage to the asphalt roadbed; a semi-rigid base layer is laid on top of the gravel layer, and an asphalt layer is laid on top of the semi-rigid base layer. In this utility model, the addition of the first and second geotextile layers effectively prevents salt from migrating upwards with water, reducing salt damage to the asphalt roadbed, significantly reducing problems such as roadbed bulging and cracking. The longitudinal and transverse drainage structures can promptly drain water from the roadbed.

Description

Technical Field

[0001] This utility model belongs to the field of asphalt roadbed technology, and specifically relates to an asphalt roadbed structure. Background Technology

[0002] Asphalt subgrade is a crucial foundational structure in road engineering. It is not simply composed of asphalt, but rather uses treated natural soil and rock materials or industrial waste as a base, with a specific proportion of asphalt added according to road design requirements. The addition of asphalt effectively enhances the stability, waterproofing, and deformation resistance of the subgrade, reduces water erosion, and mitigates adverse effects such as seasonal frost heave and softening. Through scientific proportioning and construction techniques, the asphalt subgrade provides a solid and reliable support for the road surface, ensuring that the road maintains good smoothness and performance under long-term traffic loads and complex environmental conditions. It is a key element in ensuring road safety and durable operation.

[0003] Currently, asphalt roadbed structures may exhibit unique defects in special geological areas such as saline soil and expansive soil. Taking saline soil areas as an example, the salts in the soil migrate and crystallize under the influence of water. The volume change can damage the bond between the asphalt and the roadbed soil, leading to bulging and cracking of the roadbed and affecting its overall integrity. The characteristic of expansive soil to expand when it encounters water and shrink when it loses water can cause uneven deformation of the asphalt roadbed, resulting in problems such as road surface undulation and cracks. Moreover, these defects are less common in ordinary areas, but in some areas with concentrated chemical industries, the asphalt roadbed may be eroded by chemical substances, so there is room for improvement. Utility Model Content

[0004] The purpose of this invention is to provide an asphalt roadbed structure to solve the problem of insufficient protective performance of current asphalt roadbed structures mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an asphalt roadbed structure, including a roadbed subbase; a crushed stone layer laid on top of the roadbed subbase; a gravel layer laid on top of the crushed stone layer, with gaps between the gravel layers to facilitate drainage; a second geotextile layer and a first geotextile layer laid between the roadbed subbase and the crushed stone layer, and between the crushed stone layer and the gravel layer, respectively; the double-layer arrangement of the second geotextile layer and the first geotextile layer effectively prevents salt from migrating upwards with water, reducing the damage of salt to the asphalt roadbed.

[0006] A semi-rigid base layer is laid on top of the gravel layer, and an asphalt layer is laid on top of the semi-rigid base layer.

[0007] Drainage components are also installed in the subbase and crushed stone layer of the road surface. The drainage components in the subbase and crushed stone layer are distributed in a crisscross pattern to form a drainage network inside the roadbed, which can drain the water in the roadbed in a timely manner.

[0008] Preferably, both the subbase and the gravel layer of the road surface have a first placement hole and a second placement hole, wherein the first placement hole is located below the second placement hole and the two are not connected to each other. In drainage, the drainage is mainly carried out by water seeping out of the subbase and gravel layer to the first and second placement holes, rather than direct drainage. The first and second placement holes are arranged in an alternating manner, and the drainage component is placed inside the first and second placement holes.

[0009] Preferably, the drainage components include drainage blind ditch one and drainage blind ditch two, wherein drainage blind ditch two is located inside placement hole one, and drainage blind ditch one is located inside placement hole two. Drainage blind ditch one and drainage blind ditch two are made of the same material, both being plastic, and have gaps on their overall surface to allow water to drain out. This structure is a conventional existing structure, so it will not be described in further detail here.

[0010] Preferably, the system also includes a concrete pouring layer, which is poured on both sides of the roadbed structure. The top of the concrete pouring layer is flush with the top of the asphalt layer, and the bottom of the concrete pouring layer is flush with the bottom surface of the road subbase. Placing the concrete pouring layer on both sides of the roadbed can prevent chemical substances from directly contacting the roadbed and reduce the impact of chemical erosion on the roadbed.

[0011] Preferably, the second geotextile layer has the same thickness as the first geotextile layer, and the edge of the first geotextile layer is in contact with the inner surface of the concrete pouring layer.

[0012] Preferably, the thickness of the gravel layer is equal to the thickness of the semi-rigid base layer, and the density of the gravel layer is less than that of the crushed stone layer to ensure drainage, but its strength should be sufficient to support the asphalt layer and subsequent use.

[0013] Preferably, the thickness of the subbase layer is greater than the thickness of the crushed stone layer, and the two sides of the subbase layer are compacted against the inner wall of the concrete pouring layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] In this invention, the addition of geotextile layers one and two effectively prevents salt from migrating upwards with water, reducing the damage of salt to the asphalt subgrade and significantly reducing problems such as subgrade bulging and cracking. At the same time, the longitudinal and transverse drainage structures can drain water from the subgrade in a timely manner. In expansive soil areas, water is the main factor causing its expansion and contraction. A good drainage system can effectively reduce soil moisture content and reduce the volume change of expansive soil. Furthermore, the added concrete pouring layer can prevent chemical substances from directly contacting the subgrade, reducing the impact of chemical erosion on the subgrade. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This utility model is for Figure 1 A schematic diagram after the removal of the blind drainage ditch;

[0018] Figure 3 This is a cross-sectional view of the present invention.

[0019] In the picture:

[0020] 100. Road subbase; 101. Crushed stone layer; 102. Geotextile layer one; 103. Gravel layer; 104. Semi-rigid base; 105. Asphalt layer; 106. Geotextile layer two; 107. Placement hole one; 108. Placement hole two;

[0021] 200. Drainage blind ditch one; 201. Drainage blind ditch two;

[0022] 300. Concrete pouring layer. Detailed Implementation

[0023] 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.

[0024] Please see Figures 1 to 3 This utility model provides a technical solution: an asphalt roadbed structure, including...

[0025] Road subbase 100;

[0026] Crushed stone layer 101 is laid on top of road subbase 100;

[0027] A gravel layer 103 is laid on top of the crushed stone layer 101. There are gaps between the gravel layers 103, which have the function of drainage. Geotextile layer 2 106 and geotextile layer 102 are laid between the road subbase 100 and the crushed stone layer 101, and between the crushed stone layer 101 and the gravel layer 103, respectively. Through the double-layer setting of geotextile layer 2 106 and geotextile layer 102, salt can be effectively prevented from migrating upward with water, reducing the damage of salt to the asphalt subgrade.

[0028] A semi-rigid base layer 104 is laid on top of the gravel layer 103, and an asphalt layer 105 is laid on top of the semi-rigid base layer 104.

[0029] Drainage components are also installed in the subbase 100 and the crushed stone layer 101. The drainage components in the subbase 100 and the crushed stone layer 101 are distributed in a crisscross pattern to form a drainage network inside the roadbed, which can drain the water in the roadbed in a timely manner.

[0030] In this embodiment, preferably, both the road subbase 100 and the gravel layer 101 have placement holes 107 and 108, with placement hole 107 located below placement hole 108 and the two not connected to each other. During drainage, water is mainly drained by seeping from the road subbase 100 and gravel layer 101 to placement holes 107 and 108, rather than being directly discharged. Placement holes 107 and 108 are arranged in an alternating pattern, and the drainage components are placed inside placement holes 107 and 108.

[0031] In this embodiment, preferably, the drainage components include drainage blind ditch one 200 and drainage blind ditch two 201, wherein drainage blind ditch two 201 is located within placement hole one 107, and drainage blind ditch one 200 is located within placement hole two 108. Drainage blind ditch one 200 and drainage blind ditch two 201 are made of the same material, both being plastic, and have gaps on their overall surface to allow water to drain out. This structure is a conventional existing structure, so it will not be described in further detail here.

[0032] In this embodiment, preferably, a concrete pouring layer 300 is also included. The concrete pouring layer 300 is poured on both sides of the roadbed structure, and the top of the concrete pouring layer 300 is flush with the top of the asphalt layer 105, while the bottom of the concrete pouring layer 300 is flush with the bottom surface of the road subbase 100. Placing the concrete pouring layer 300 on both sides of the roadbed can prevent chemical substances from directly contacting the roadbed and reduce the impact of chemical erosion on the roadbed.

[0033] In this embodiment, preferably, the second geotextile layer 106 and the first geotextile layer 102 have the same thickness, and the edge of the first geotextile layer 102 is attached to the inner side of the concrete pouring layer 300.

[0034] In this embodiment, preferably, the thickness of the gravel layer 103 is equal to the thickness of the semi-rigid base layer 104, and the density of the gravel layer 103 is less than that of the crushed stone layer 101, so as to ensure drainage, but its laying strength should be sufficient to support the asphalt layer 105 and subsequent use.

[0035] In this embodiment, preferably, the thickness of the road subbase 100 is greater than the thickness of the crushed stone layer 101, and the two sides of the road subbase 100 are compacted and pressed against the inner wall of the concrete pouring layer 300.

[0036] Although embodiments of the present invention have been shown and described (see the detailed description above), it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An asphalt roadbed structure, comprising: Road subbase (100); A crushed stone layer (101) is laid on top of the subbase layer (100) of the road surface; Its features are: The top of the crushed stone layer (101) is also covered with a gravel layer (103), and geotextile layer two (106) and geotextile layer one (102) are respectively laid between the road subbase (100) and the crushed stone layer (101) and between the crushed stone layer (101) and the gravel layer (103). The gravel layer (103) is also covered with a semi-rigid base layer (104), and the semi-rigid base layer (104) is covered with an asphalt layer (105). Drainage components are also provided in the subbase (100) and the gravel layer (101) of the road surface, and the drainage components in the subbase (100) and the gravel layer (101) are distributed in a crisscross pattern.

2. An asphalt pavement structure according to claim 1, characterised in that: The road subbase (100) and the crushed stone layer (101) are each provided with a placement hole 1 (107) and a placement hole 2 (108). The placement hole 1 (107) is located below the placement hole 2 (108) and the two are not connected to each other. The placement hole 1 (107) and the placement hole 2 (108) are arranged in an alternating manner. The drainage component is placed inside the placement hole 1 (107) and the placement hole 2 (108).

3. An asphalt pavement structure according to claim 2, wherein: The drainage components are drainage blind ditch one (200) and drainage blind ditch two (201), wherein drainage blind ditch two (201) is located inside placement hole one (107), and drainage blind ditch one (200) is located inside placement hole two (108).

4. An asphalt pavement structure according to claim 1 wherein: It also includes a concrete pouring layer (300) poured on both sides of the roadbed structure, with the top of the concrete pouring layer (300) flush with the top of the asphalt layer (105) and the bottom of the concrete pouring layer (300) flush with the bottom surface of the road subbase (100).

5. An asphalt pavement structure according to claim 4, wherein: The second geotextile layer (106) has the same thickness as the first geotextile layer (102), and the edge of the first geotextile layer (102) is attached to the inner side of the concrete pouring layer (300).

6. An asphalt pavement structure according to claim 1 wherein: The thickness of the gravel layer (103) is equal to the thickness of the semi-rigid base layer (104), and the density of the gravel layer (103) is less than the density of the crushed stone layer (101).

7. An asphalt pavement structure according to claim 4, wherein: The thickness of the road subbase (100) is greater than the thickness of the crushed stone layer (101), and the two sides of the road subbase (100) are compacted against the inner wall of the concrete pouring layer (300).

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