Semi-flexible asphalt pavement base structure

Abstract

The utility model discloses a semi-flexible asphalt pavement base structure, which relates to the technical field of semi-flexible asphalt pavement base structures and comprises a pavement foundation, in particular to a cement stabilized macadam base arranged at the top of the pavement foundation, and a sealing layer fixedly connected to the top of the cement stabilized macadam base. The top of the sealing layer is fixedly connected with a first asphalt concrete layer and a second asphalt concrete layer, the first asphalt concrete layer and the second asphalt concrete layer are consistent in thickness, a plastic layer is fixedly connected between the first asphalt concrete layer and the second asphalt concrete layer, and the thickness of the plastic layer is consistent with that of the first asphalt concrete layer. The first asphalt concrete layer is located on the left side of the plastic layer, the second asphalt concrete layer is located on the right side of the plastic layer, the plastic layer is made of low-carbon steel, the principle is simple, the structure is effective, pavement bursting caused by high-temperature expansion of asphalt can be effectively prevented, and meanwhile the problem that a bonding layer is loosened due to hot summer can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of semi-flexible asphalt pavement base structures, and specifically relates to a semi-flexible asphalt pavement base structure. Background Technique

[0002] Asphalt is a dark brown complex mixture composed of hydrocarbon compounds with different molecular weights and their non-metallic derivatives. It is a kind of high-viscosity organic liquid, in a liquid state, with a black surface, soluble in carbon disulfide. Asphalt is a waterproof, moisture-proof and anti-corrosion organic cementing material. Asphalt can be mainly divided into three types: coal tar asphalt, petroleum asphalt and natural asphalt. Among them, coal tar asphalt is a by-product of coking, petroleum asphalt is the residue after crude oil distillation, and natural asphalt is stored underground, some forming ore layers or accumulating on the earth's crust surface. Asphalt is mainly used in industries such as coatings, plastics, rubber, etc. and for paving roads.

[0003] In a rut-resistant semi-flexible pavement structure disclosed in the utility model patent application publication specification CN213804695U in China, although the problem of short service life is solved, the rut-resistant semi-flexible pavement structure still has the following disadvantages: First, due to the thermal expansion and contraction of asphalt, it is very easy to have problems such as pavement cracking or pavement bulging in summer, causing potential safety hazards; Second, under the sun exposure in summer, due to the strong sunlight, when the temperature of the pavement is high, the adjacent bonding layer will become loose due to the high temperature, which is not conducive to long-term use. Content of the Utility Model

[0004] (I) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the utility model provides a semi-flexible asphalt pavement base structure, which solves the problems raised in the above background technique.

[0006] (II) Technical Solutions

[0007] To achieve the above objectives, the utility model is realized through the following technical solutions: A semi-flexible asphalt pavement base structure includes a road surface foundation. Specifically, a cement stabilized macadam base is provided on the top of the road surface foundation. A sealing layer is fixedly connected to the top of the cement stabilized macadam base. A first asphalt concrete layer and a second asphalt concrete layer are fixedly connected to the top of the sealing layer. The thicknesses of the first asphalt concrete layer and the second asphalt concrete layer are the same. A plastic layer is fixedly connected between the first asphalt concrete layer and the second asphalt concrete layer. The thickness of the plastic layer is the same as that of the first asphalt concrete layer. The first asphalt concrete layer is located on the left side of the plastic layer, and the second asphalt concrete layer is located on the right side of the plastic layer. The material of the plastic layer is low-carbon steel.

[0008] Optionally, the plastic layer is in a square ring shape, the bottom of the plastic layer is in close contact with the sealing layer, an air groove is provided in the middle of the plastic layer, and both the first asphalt concrete layer and the second asphalt concrete layer are of AC-13F type.

[0009] Optionally, the thickness of the first asphalt concrete layer and the second asphalt concrete layer is not less than 3 cm, the thickness of the cement stabilized macadam base layer is not less than 18 cm, and a bonding layer is fixedly connected to the tops of the plastic layer, the first asphalt concrete layer and the second asphalt concrete layer.

[0010] Optionally, a semi-flexible pavement base layer is fixedly connected to the top of the bonding layer, a heat insulation layer is fixedly connected to the top of the semi-flexible pavement base layer, and a semi-flexible pavement top layer is fixedly connected to the top of the heat insulation layer.

[0011] Optionally, both the semi-flexible pavement base layer and the semi-flexible pavement top layer adopt SFP-13 pavement, and the cooling linear shrinkage coefficient of the semi-flexible pavement base layer and the semi-flexible pavement top layer is (0.8 - 1.5)×10-5.

[0012] Optionally, the material of the heat insulation layer is a rigid heat insulation material, a waterproof layer is fixedly connected to the top of the semi-flexible pavement top layer, the top of the waterproof layer is in an arc shape with both sides low and the middle high, and the material of the waterproof layer is silicone waterproof agent.

[0013] (III) Beneficial effects

[0014] The utility model provides a semi-flexible asphalt pavement base structure, which has the following beneficial effects:

[0015] 1. For this semi-flexible asphalt pavement base structure, since the material of the plastic layer is low-carbon steel and the plastic layer is arranged in a square ring shape, the semi-flexible asphalt pavement base structure has the effect of enabling the plastic layer to have good plasticity. Through the combined setting of the plastic layer, the first asphalt concrete layer and the second asphalt concrete layer, during use, when the sun shines in summer and the first asphalt concrete layer and the second asphalt concrete layer expand, the plastic layer can provide expansion space for the first asphalt concrete layer and the second asphalt concrete layer, thereby playing a role in preventing the first asphalt concrete layer and the second asphalt concrete layer from being extruded with each other during expansion, achieving the purpose of preventing the road surface from cracking.

[0016] 2. The base structure of this semi-flexible asphalt pavement has an arc-shaped setting with both sides lower and the middle higher at the top of the waterproof layer, enabling this semi-flexible asphalt pavement base structure to have the effect of reducing water accumulation on the road surface when it rains. Through the combined setting of the heat insulation layer, the semi-flexible pavement base, and the semi-flexible pavement top layer, the temperature of the bonding layer can be reduced during use in summer, thus playing a role in preventing the bonding layer from loosening due to being in a high-temperature state for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional overall schematic diagram of the road surface of the present utility model;

[0018] Figure 2 It is a front overall schematic diagram of the road surface of the present utility model;

[0019] Figure 3 For the present utility model Figure 1 An enlarged schematic diagram of part A;

[0020] Figure 4 For the present utility model Figure 1 An enlarged schematic diagram of part B.

[0021] In the figure: 1, road surface foundation; 2, cement stabilized macadam base; 3, sealing layer; 4, first asphalt concrete layer; 5, second asphalt concrete layer; 6, plastic layer; 7, bonding layer; 8, semi-flexible pavement base; 9, heat insulation layer; 10, semi-flexible pavement top layer; 11, waterproof layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Embodiment 1

[0023] Please refer to Figures 1 to 3, the present utility model provides a technical solution: a semi-flexible asphalt pavement base structure, including a pavement foundation 1. Specifically, a cement stabilized macadam base 2 is provided on the top of the pavement foundation 1. A sealing layer 3 is fixedly connected to the top of the cement stabilized macadam base 2. A first asphalt concrete layer 4 and a second asphalt concrete layer 5 are fixedly connected to the top of the sealing layer 3. The thicknesses of the first asphalt concrete layer 4 and the second asphalt concrete layer 5 are the same. A plastic layer 6 is fixedly connected between the first asphalt concrete layer 4 and the second asphalt concrete layer 5. The thickness of the plastic layer 6 is the same as that of the first asphalt concrete layer 4. The first asphalt concrete layer 4 is located on the left side of the plastic layer 6, and the second asphalt concrete layer 5 is located on the right side of the plastic layer 6. The material of the plastic layer 6 is low-carbon steel. The plastic layer 6 is in a square ring shape. The bottom of the plastic layer 6 is in close contact with the sealing layer 3. An air groove is provided in the middle of the plastic layer 6. Both the first asphalt concrete layer 4 and the second asphalt concrete layer 5 are of AC-13F type. The thicknesses of the first asphalt concrete layer 4 and the second asphalt concrete layer 5 are not less than 3 cm, and the thickness of the cement stabilized macadam base 2 is not less than 18 cm. A bonding layer 7 is fixedly connected to the top of the plastic layer 6, the first asphalt concrete layer 4, and the second asphalt concrete layer 5.

[0024] During use, due to the thermal expansion and contraction of asphalt, problems such as pavement cracking or pavement bulging are likely to occur in summer, posing a safety hazard. Therefore, there is a semi-flexible asphalt pavement base structure. When the pavement base is exposed to sunlight in summer, the first asphalt concrete layer 4 and the second asphalt concrete layer 5 expand due to the increase in temperature. At this time, due to the fact that the material of the plastic layer 6 is low-carbon steel and the plastic layer 6 is in a square ring shape, the first asphalt concrete layer 4 and the second asphalt concrete layer 5 can be made to squeeze towards the plastic layer 6 when expanding, which can relieve the expansion of the first asphalt concrete layer 4 and the second asphalt concrete layer 5 to the greatest extent, thereby avoiding the problem of pavement cracking caused by the mutual extrusion of the first asphalt concrete layer 4 and the second asphalt concrete layer 5 during expansion. Embodiment 2

[0025] Please refer to Figures 1 to 4 , the present utility model provides a technical solution: a semi-flexible asphalt pavement base structure. A semi-flexible pavement base 8 is fixedly connected to the top of the bonding layer 7. An insulation layer 9 is fixedly connected to the top of the semi-flexible pavement base 8. A semi-flexible pavement top layer 10 is fixedly connected to the top of the insulation layer 9. Both the semi-flexible pavement base 8 and the semi-flexible pavement top layer 10 adopt SFP-13 pavement. The temperature drop linear shrinkage coefficient of the semi-flexible pavement base 8 and the semi-flexible pavement top layer 10 is (0.8 - 1.5) × 10-5. The material of the insulation layer 9 is a rigid heat-insulating material. A waterproof layer 11 is fixedly connected to the top of the semi-flexible pavement top layer 10. The top of the waterproof layer 11 is in an arc shape with both sides low and the middle high. The material of the waterproof layer 11 is an organosilicon waterproof agent.

[0026] During use, under the sunlight in summer, since the sunlight is relatively intense and the temperature of the road surface is high, the adjacent bonding layer 7 will become loose due to the high temperature, which is not conducive to long-term use. Therefore, there is a semi-flexible asphalt pavement base structure. When the road surface is in normal use in summer, through the setting of the top of the waterproof layer 11 in an arc shape with both sides low and the middle high, it can make the rainwater in the sky slide to the left and right sides of the road when it falls on the top of the road surface, avoiding the retention of rainwater on the top of the road surface. When the sun shines on the road surface, through the setting that the heat insulation layer 9 is made of a hard heat preservation and insulation material, it can reduce the downward transmission of high temperature, thereby reducing the bonding layer 7 from contacting too high a temperature for a long time in summer, playing a role in preventing the bonding layer 7 from loosening due to being in a high temperature state for a long time.

[0027] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A semi-flexible asphalt pavement base structure, comprising a pavement foundation (1), characterized in that: Specifically, a cement-stabilized crushed stone base layer (2) is provided on the top of the pavement foundation (1); a sealing layer (3) is fixedly connected to the top of the cement-stabilized crushed stone base layer (2); a first asphalt concrete layer (4) and a second asphalt concrete layer (5) are fixedly connected to the top of the sealing layer (3); the first asphalt concrete layer (4) and the second asphalt concrete layer (5) have the same thickness; a plastic layer (6) is fixedly connected between the first asphalt concrete layer (4) and the second asphalt concrete layer (5); the thickness of the plastic layer (6) is the same as that of the first asphalt concrete layer (4); the first asphalt concrete layer (4) is located on the left side of the plastic layer (6); the second asphalt concrete layer (5) is located on the right side of the plastic layer (6); and the material of the plastic layer (6) is low-carbon steel.

2. A semi-flexible asphalt pavement base structure according to claim 1, characterized in that: The plastic layer (6) is in a square ring shape, the bottom of the plastic layer (6) is in close contact with the sealing layer (3), an air groove is provided in the middle of the plastic layer (6), and the first asphalt concrete layer (4) and the second asphalt concrete layer (5) are both AC-13F models.

3. A semi-flexible asphalt pavement base structure according to claim 2, characterized in that: The thickness of the first asphalt concrete layer (4) and the second asphalt concrete layer (5) is not less than 3 centimeters, the thickness of the cement-stabilized crushed stone base layer (2) is not less than 18 centimeters, and the plastic layer (6) is fixedly connected to the top of the first asphalt concrete layer (4) and the second asphalt concrete layer (5) by a bonding layer (7).

4. A semi-flexible asphalt pavement base structure according to claim 3, characterized in that: The top of the bonding layer (7) is fixedly connected to a semi-flexible pavement base layer (8), the top of the semi-flexible pavement base layer (8) is fixedly connected to a heat insulation layer (9), and the top of the heat insulation layer (9) is fixedly connected to a semi-flexible pavement top layer (10).

5. A semi-flexible asphalt pavement base structure according to claim 4, characterized in that: The semi-flexible pavement base layer (8) and the semi-flexible pavement top layer (10) are both made of SFP-13 pavement. The cooling linear shrinkage coefficient of the semi-flexible pavement base layer (8) and the semi-flexible pavement top layer (10) is (0.8-1.5)×10 -5 .

6. A semi-flexible asphalt pavement base structure according to claim 5, characterized in that: The material of the heat insulation layer (9) is a hard heat-insulating material. The top of the semi-flexible pavement top layer (10) is fixedly connected to a waterproof layer (11). The top of the waterproof layer (11) is in an arc shape with low sides and a high middle. The material of the waterproof layer (11) is an organic silicon waterproofing agent.

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