Semi-flexible asphalt pavement base structure

Abstract

The utility model relates to the technical field of pavement base structures, and particularly discloses a semi-flexible asphalt pavement base structure, which comprises a rammed earth layer, a rammed earth layer and a semi-flexible asphalt pavement base structure, the gravel part is laid on the surface of the rammed earth layer; the stabilizing part is laid on the surface of the gravel part; the concrete part is laid on the surface of the stabilizing part; according to the utility model, the thick broken stone hardcore is arranged, the roller press is used for compacting to ensure that gaps among broken stones are filled, the cement-based grouting material with high flowability is poured, the trowelling machine is used for compacting to form a uniform hardcore, the roller press is used for final compacting to ensure that the whole hardcore is flat and firm, and the cement-stabilized base layer is adopted, so that the construction efficiency is improved. Graded broken stone serves as aggregate, gaps of the aggregate are filled with a certain amount of cementing materials and enough mortar, the strength is increased along with the age, and a plate body is rapidly formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of pavement base structure, and in particular relates to a semi-flexible asphalt pavement base structure. Background Art

[0002] The pavement base is a layered structure that is paved in layers on the surface of the roadbed (or cushion layer) with a single material according to certain technical measures. The quality of its material and quality directly affects the quality and performance of the pavement. The base is the load-bearing layer of the entire road and plays a role in stabilizing the road surface. Semi-flexible pavement is a composite pavement material that combines rigidity and flexibility. Therefore, the application of semi-flexible asphalt pavement base structure is becoming more and more widespread.

[0003] In the Chinese patent with publication number CN205134126U, a semi-flexible asphalt pavement base structure is mentioned, including an upper base and a lower base, the lower base is a lime-fly ash stabilized gravel layer, and the upper base is a foamed asphalt in-situ cold-regenerated lime-fly ash gravel layer. The utility model adopts the foamed asphalt in-situ cold-regeneration technology to recycle on-site waste materials, and adds a semi-flexible upper base to the pavement base, which not only overcomes the disadvantage of weak interface connection between the semi-rigid base and the asphalt surface layer due to material differences, but also ensures that the pavement structure has sufficient strength and overall stability.

[0004] However, the above-mentioned base structure has some problems when used, and the gaps between the gravels are not filled evenly, resulting in the entire cushion layer being not flat enough.

[0005] To this end, those skilled in the art have proposed a semi-flexible asphalt pavement base structure to solve the above-mentioned problems. Utility Model Content

[0006] The utility model aims to provide a semi-flexible asphalt pavement base structure to solve the problems raised in the above background technology.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A semi-flexible asphalt pavement base structure, comprising:

[0009] A rammed earth layer, wherein the rammed earth layer is used to bear the load;

[0010] A crushed stone part, wherein the crushed stone part is laid on the surface of the rammed soil layer;

[0011] a stabilizing portion, the stabilizing portion being laid on the surface of the gravel portion;

[0012] A concrete portion is laid on a surface of the stabilizing portion.

[0013] Preferably, the rammed soil layer is laid on the surface of the original roadbed.

[0014] Preferably, the crushed stone part comprises a graded crushed stone subbase and a thick graded crushed stone cushion layer, the graded crushed stone subbase is laid on the surface of the rammed soil layer, and the thick graded crushed stone cushion layer is laid on the surface of the graded crushed stone subbase.

[0015] Preferably, the stabilizing portion comprises a water-stable base layer and a cement concrete layer, wherein the water-stable base layer is laid on the surface of a thick grade crushed stone cushion layer, and the cement concrete layer is laid on the surface of the water-stable base layer.

[0016] Preferably, the concrete part comprises a thick C20 concrete base layer, the thick C20 concrete base layer is laid on the surface of the cement concrete layer, and the surface of the thick C20 concrete base layer is laid with a thick rough asphalt concrete layer.

[0017] Preferably, the surface of the thick coarse asphalt concrete layer is paved with a thick fine asphalt concrete base layer.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] (1) The utility model is provided with a thick crushed stone cushion layer, which is compacted by a roller to ensure that the gaps between the crushed stones are filled, and a cement-based grouting material with high fluidity is poured, which is compacted by a trowel to form a uniform cushion layer, and a roller is used for the final compaction to ensure that the entire cushion layer is flat and solid.

[0020] (2) The utility model adopts a water-stable base layer, which uses graded crushed stone as aggregate, adopts a certain amount of cementitious material and a sufficient volume of mortar to fill the gaps in the aggregate, and spreads and compacts according to the interlocking principle. The compaction degree is close to the density, and the strength depends on the interlocking principle between the crushed stones. At the same time, there is a sufficient volume of mortar to fill the gaps in the aggregate. The initial strength is high, and the strength increases with age. The board body is quickly formed, so it has higher strength, better impermeability and frost resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front cross-sectional structural schematic diagram of the utility model;

[0022] In the figure: 1, rammed earth layer; 2, crushed stone part; 3, stabilization part; 4, concrete part;

[0023] 201. Graded crushed stone subbase; 202. Thick graded crushed stone cushion layer;

[0024] 301, water-stable base layer; 302, cement concrete layer;

[0025] 401. Thick C20 concrete base; 402. Thick coarse asphalt concrete layer; 403. Thick fine asphalt concrete base. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1:

[0028] See also Figure 1 As shown, a semi-flexible asphalt pavement base structure comprises:

[0029] A plain soil compaction layer 1, wherein the plain soil compaction layer 1 is used to bear the load;

[0030] A crushed stone part 2, the crushed stone part 2 is laid on the surface of the rammed earth layer 1;

[0031] A stabilizing portion 3, wherein the stabilizing portion 3 is laid on the surface of the gravel portion 2;

[0032] Concrete part 4 , the concrete part 4 is laid on the surface of the stabilizing part 3 .

[0033] As can be seen from the above, the rammed earth layer 1 is used as the bottom support. The rammed earth layer 1 is the foundation of the floor. The raw soil is sandy clay without impurities. After being rammed, it can withstand the ground load transmitted from above. Then the crushed stone part 2 is laid on its surface for filling and support. The surface of the crushed stone part 2 is the stabilizing part 3, which effectively improves the bearing capacity and impermeability of the base layer. The surface of the stabilizing part 3 is the concrete part 4, which has a large thickness and a strong bearing capacity.

[0034] Specifically, the rammed soil layer 1 is laid on the surface of the original roadbed.

[0035] As can be seen from the above, the rammed earth layer 1 is provided to bear the ground load transmitted from above.

[0036] Specifically, the crushed stone part 2 includes a graded crushed stone base layer 201 and a thick graded crushed stone cushion layer 202 . The graded crushed stone base layer 201 is laid on the surface of the rammed soil layer 1 , and the thick graded crushed stone cushion layer 202 is laid on the surface of the graded crushed stone base layer 201 .

[0037] As can be seen from the above, the graded crushed stone base layer 201 is preferably hard, wear-resistant, soil- and organic-free graded crushed stone. The particle size of the crushed stone should be graded as required, and single-size crushed stone and stone chips of different particle sizes are used to ensure the stability and bearing capacity of the bottom. The thick crushed stone cushion layer 202 is compacted with a roller to ensure that the gaps between the crushed stones are filled, and a cement-based grouting material with high fluidity is poured and compacted with a trowel to form a uniform cushion layer. The final compaction is performed with a roller to ensure that the entire cushion layer is flat and solid.

[0038] Specifically, the stabilizing portion 3 includes a water-stable base layer 301 and a cement concrete layer 302 . The water-stable base layer 301 is laid on the surface of the thick crushed stone cushion layer 202 , and the cement concrete layer 302 is laid on the surface of the water-stable base layer 301 .

[0039] As can be seen from the above, the water-stable base layer 301 uses graded crushed stones as aggregates, adopts a certain amount of cementitious materials and sufficient mortar volume to fill the gaps in the aggregates, and is spread and compacted according to the interlocking principle. Its compaction degree is close to its density, and its strength relies on the interlocking principle between the crushed stones. At the same time, there is sufficient mortar volume to fill the gaps in the aggregates. It has high initial strength, and the strength increases with age. It quickly forms a board body, so it has high strength, good impermeability and frost resistance. The cement concrete layer 302 prevents or reduces the bottom of the board from being hollowed out and dislocated due to mud pumping, and works together with the crushed stone part 2 to control or reduce the adverse effects of uneven frost heave or volume deformation of the roadbed on the concrete surface layer, providing a stable and solid foundation for the concrete part 4 and improving the load transfer capacity of the joint.

[0040] Specifically, the concrete part 4 includes a thick C20 concrete base layer 401 , which is laid on the surface of the cement concrete layer 302 , and a thick rough asphalt concrete layer 402 is laid on the surface of the thick C20 concrete base layer 401 .

[0041] From the above, it can be seen that the thick C20 concrete base 401 is poured from the highest point to the overflow port according to the grid blocks, and then leveled with a small vibrator after vibration, and then leveled with a scraper. After finding the slope, it is smoothed with a wooden trowel and pressed with an iron trowel. After the floating water sinks, it is considered that there are footprints but no sinking when people step on it, and then it can be pressed a second time with an iron trowel.

[0042] Specifically, a thick and fine asphalt concrete base layer 403 is laid on the surface of the thick and coarse asphalt concrete layer 402 .

[0043] As can be seen from the above, after the compaction and rolling processes, the thickness of the thick coarse asphalt concrete layer 402 is 5 cm, and the thickness of the thick fine asphalt concrete base layer 403 is 3 cm.

[0044] Working principle: The rammed earth layer 1 is the bottom support. The rammed earth layer 1 is the foundation of the floor. The raw soil is sandy clay without impurities. Only after tamping can it bear the ground load transmitted from above. The graded crushed stone subbase 201 is preferably hard, wear-resistant, and graded crushed stone without soil and organic matter. The particle size of the crushed stone should be graded as required. Single-size crushed stone and stone chips of different particle sizes are used to ensure the stability and bearing capacity of the bottom. The thick crushed stone cushion layer 202 is compacted by a roller to ensure that the gaps between the crushed stones are filled. It is compacted with a trowel to form a uniform cushion layer. The final compaction is performed with a roller to ensure that the entire cushion layer is flat and solid. The water-stable base layer 301 uses graded crushed stone as aggregate, and a certain amount of cementitious material and sufficient mortar volume are used to fill the gaps between the aggregates. It is spread and compacted according to the interlocking principle. Its compaction degree is close to the density, and its strength depends on the interlocking principle between the crushed stones. At the same time, there is enough The volume of mortar is used to fill the gaps in the aggregate. The initial strength is high, and the strength increases with age. The board body is quickly formed, so it has high strength, good impermeability and frost resistance. The cement concrete layer 302 prevents or reduces the defects such as bottom debonding and misalignment caused by mud pumping. It works together with the gravel part 2 to control or reduce the adverse effects of uneven frost heave or volume deformation of the roadbed on the concrete surface layer, provide a stable and solid foundation for the concrete part 4, and improve the load transfer capacity of the joint. The thick C20 concrete base layer 401 is poured from the highest point to the overflow port according to the grid blocks, and a small vibrator is used to vibrate and then flatten it, and it is scraped flat with a scraper. After finding the slope, it is rubbed flat with a wooden trowel and pressed with an iron trowel. After the floating water sinks, it is considered that there are footprints but no sinking when people step on it, and then it is pressed a second time with an iron trowel. After compaction and rolling and other process treatments, the thickness of the thick coarse asphalt concrete layer 402 is 5 cm, and the thickness of the thick fine asphalt concrete base layer 403 is 3 cm.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A semi-flexible asphalt pavement base structure, characterized in that: include: A rammed earth layer (1), wherein the rammed earth layer (1) is used to bear a load; A crushed stone part (2), wherein the crushed stone part (2) is laid on the surface of the rammed earth layer (1); A stabilizing portion (3), the stabilizing portion (3) being laid on the surface of the gravel portion (2); A concrete part (4), the concrete part (4) being laid on the surface of the stabilizing part (3); The crushed stone part (2) comprises a graded crushed stone base layer (201) and a thick graded crushed stone cushion layer (202), wherein the graded crushed stone base layer (201) is laid on the surface of the rammed soil layer (1), and the thick graded crushed stone cushion layer (202) is laid on the surface of the graded crushed stone base layer (201); The stabilizing part (3) comprises a water-stable base layer (301) and a cement concrete layer (302), wherein the water-stable base layer (301) is laid on the surface of a thick crushed stone cushion layer (202), and the cement concrete layer (302) is laid on the surface of the water-stable base layer (301).

2. A semi-flexible asphalt pavement base structure according to claim 1, characterized in that: The rammed soil layer (1) is laid on the surface of the original roadbed.

3. A semi-flexible asphalt pavement base structure according to claim 1, characterized in that: The concrete part (4) comprises a thick C20 concrete base layer (401), wherein the thick C20 concrete base layer (401) is laid on the surface of the cement concrete layer (302), and a thick rough asphalt concrete layer (402) is laid on the surface of the thick C20 concrete base layer (401).

4. A semi-flexible asphalt pavement base structure according to claim 3, characterized in that: A thick fine asphalt concrete base layer (403) is laid on the surface of the thick coarse asphalt concrete layer (402).

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