Stone structure layer for preventing tire scuffing and its laying method

Abstract

This invention discloses a crushed stone structural layer and its laying method to prevent tire scraping and detachment, belonging to the field of road construction. The structural layer includes a concave-convex skeleton layer and an anti-detachment and anti-skid structural layer formed by laying anti-detachment sand particles on the skeleton layer. This invention employs two construction processes: First, a first layer of cationic emulsified asphalt + crushed stone is directly and simultaneously spread on the original concrete pavement layer, forming a skeleton layer on the original pavement. This is then compacted with a road roller, with the crushed stone partially embedded in the original pavement layer, forming a concave-convex skeleton layer. Next, a second layer of anionic emulsified asphalt + anti-abrasion sand is simultaneously spread on top, using a mop to reduce loose sand, and then compacted with a road roller. The anti-abrasion sand is embedded in the depressions and gaps of the crushed stone in the first skeleton layer, forming a continuous and smooth pavement layer, reducing the scraping force of the tire on the skeleton layer crushed stone and preventing individual crushed stone particles from falling off. Furthermore, the attraction between the cationic and anionic charges of the two layers of emulsified asphalt makes the structure of the anti-detachment and anti-skid layer more robust, and shortens the curing time by more than half an hour.

Description

Technical Field

[0001] This invention relates to the field of road maintenance and construction, and in particular to a crushed stone structure layer for preventing tire erosion and its laying method. Background Technology

[0002] After roads are opened to traffic, various surface defects begin to appear, ranging from minor to moderate and severe deterioration, including aggregate detachment and insufficient skid resistance, causing driving safety hazards and increased maintenance costs. Currently used maintenance technologies such as chip seal, micro-surfacing, and ultra-thin wearing courses, while meeting basic functional requirements, have varying degrees of drawbacks, including high cost, long construction time, susceptibility to flaking, short service life, and traffic disruption. Chip seal also suffers from high noise levels, susceptibility to impact from vehicle wheels causing individual aggregate detachment, ultimately resulting in insufficient road surface smoothness and poor applicability. Therefore, it is necessary to develop a chip seal anti-skid structural layer that is resistant to detachment, minimizes traffic impact, has a long service life, is economical and environmentally friendly, has low noise levels, and offers significant social benefits. Summary of the Invention

[0003] The main objective of this invention is to provide a gravel structure layer and its laying method to prevent tire scraping and detachment, which can effectively solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A gravel structure layer for preventing tire scraping and detachment and its laying method, the structure layer comprising a concave-convex skeleton layer and a non-detachment and anti-skid structure layer formed by laying anti-detachment sand particles on the concave-convex skeleton layer.

[0006] The paving method is as follows: the concave-convex skeleton layer is made of No. 1 asphalt and crushed stone laid on the original road surface layer and compacted by a road roller 2-5 times. Its thickness is 5-7mm and its width is 0.2-6m. The surface of the concave-convex skeleton layer forms many concave voids. The anti-skid and anti-detachment structural layer is made by laying No. 2 asphalt and anti-wear sand on the surface of the concave-convex skeleton layer. The No. 2 asphalt and anti-wear sand fill the voids on the surface of the concave-convex skeleton layer. Some of the anti-wear sand accumulates on the surface to form free floating sand. Through the action of the mop, the free floating sand and No. 2 asphalt are fully mixed, and finally a black road surface is formed on the surface.

[0007] Preferably, the No. 1 asphalt is a cationic emulsified asphalt, and the dosage is 0.5-0.9 kg / m².

[0008] The crushed stone is commonly made of basalt, diabase, granite, and other road construction materials, with a size of 3-6mm.

[0009] The dosage is 5-8 kg / m².

[0010] Preferably, the road roller weighs 3-15 tons and operates at a speed of 5-10 km / h.

[0011] Preferably, the No. 2 asphalt is anionic emulsified asphalt, and the abrasion-resistant sand specification is 1-2mm.

[0012] Preferably, the mop is mounted on the construction vehicle laying No. 2 asphalt and anti-abrasion sand, at a distance of 100-1000mm behind the anti-abrasion sand.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] In this invention, two construction processes are employed: First, a first layer of asphalt and crushed stone is directly and simultaneously spread on the original concrete pavement layer, forming a skeleton layer 0.2-6m wide on the original pavement. This skeleton layer is then compacted 2-5 times with a road roller, with the crushed stone embedded in the original pavement layer to form a textured skeleton layer. Then, a second layer of emulsified asphalt and anti-abrasion sand is simultaneously spread on top of this layer. A mop is used to reduce loose sand, and the layer is compacted 2-3 times with a road roller to form a skeleton layer. The anti-abrasion sand is embedded in the recesses and gaps of the crushed stone in the first skeleton layer, forming a continuous and smooth pavement layer. This reduces the scraping force of the tires on the crushed stone in the skeleton layer and prevents individual crushed stone particles from falling off. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the first and second layers of the gravel structure layer for preventing tire scraping and detachment according to the present invention.

[0016] In the diagram: 1. Road surface layer; 2. No. 1 asphalt; 3. Crushed stone; 4. Skeleton layer; 5. Road roller; 6. Concave-convex skeleton layer; 7. No. 2 asphalt; 8. Abrasion-resistant sand; 9. Free loose sand; 10. Mop; 11. Smooth road surface layer; 12. Anti-skid and anti-detachment structural layer. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] like Figure 1 As shown, a gravel structure layer for preventing tire scraping and detachment and its laying method are disclosed. The structure layer includes a concave-convex skeleton layer 6 and an anti-detachment and anti-skid structure layer 12 formed by laying anti-detachment sand particles on the concave-convex skeleton layer 6.

[0019] The paving method is as follows: The uneven skeleton layer 6 is made of No. 1 asphalt 2 and crushed stone 3 laid on the road surface layer 1 and compacted 2-5 times by a road roller 5, with a thickness of 5-7mm. The surface of the uneven skeleton layer 6 forms numerous depressions and voids. The anti-skid and anti-detachment structural layer 12 is made by laying No. 2 asphalt 7 and anti-wear sand 8 on the surface of the uneven skeleton layer 6. The No. 2 asphalt 7 and anti-wear sand 8 fill the voids on the surface of the uneven skeleton layer 6 and fill the depressions, forming a continuous and smooth road surface layer and reducing driving noise. Some of the anti-wear sand 8 accumulates on the surface to form free loose sand 9. Through the action of the mop 10, the free loose sand 9 and No. 2 asphalt 7 are fully mixed, and finally a black road surface is formed on the surface.

[0020] In this embodiment, Asphalt 2 is a cationic emulsified asphalt, with a dosage of 0.5-0.9 kg / m²; Crushed stone 3 is commonly made of basalt, diabase, bluestone, granite, and other road construction materials, with a crushed stone size of 3-6 mm and a dosage of 5-8 kg / m²; Asphalt 7 is anionic emulsified asphalt; and the anti-abrasion sand 8 has a size of 1-2 mm. Asphalt 2 is cationic emulsified asphalt, and Asphalt 7 is anionic emulsified asphalt. The attraction between the positive (+) and negative (-) charged ions in the emulsified asphalt makes the structure of the anti-skid and anti-detachment layer more robust, and shortens the curing time by more than half an hour.

[0021] In this embodiment, the mop 10 is mounted on the construction vehicle laying No. 2 asphalt 7 and anti-abrasion sand 8, at a distance of 100-1000mm behind the anti-abrasion sand. The mop picks up loose sand, mixes with emulsified asphalt, and fills the depressions and gaps in the first skeleton layer, forming a continuous and smooth road surface layer. This reduces the impact of the wheels on the aggregate layer's crushed stone from both the forward and reverse pushing forces, preventing individual crushed stone particles from falling off. After being processed by the mop, the loose sand and emulsified asphalt are fully mixed, reducing free loose sand and forming a uniform black road surface.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method of laying a chippings construction layer to prevent tyre skid, characterised in that, The structure layer comprises: a concave-convex framework layer (6) on which an anti-slipping structure layer (12) is laid; The concave-convex framework layer (6) comprises: a first asphalt (2) and gravel (3), the gravel (3) is laid on a road surface layer (1) by the first asphalt (2), and a concave gap is formed on the surface of the concave-convex framework layer (6) after the concave-convex framework layer (6) is laid; The anti-slipping structure layer (12) comprises: a second asphalt (7) and anti-wear sand (8), the anti-wear sand (8) is laid on the concave-convex framework layer (6) by the second asphalt (7), and the gap on the surface of the concave-convex framework layer (6) is filled; The method comprises: rolling the laid first asphalt (2) and gravel (3) by a road roller (5), and forming the concave-convex framework layer (6) after rolling; Rolling the second asphalt (7) and anti-wear sand (8) laid on the concave-convex framework layer (6) by the road roller (5), and forming the anti-slipping structure layer (12) after rolling; During laying of the anti-slipping structure layer (12), part of the anti-wear sand (8) is accumulated on the surface and forms free floating sand (9), the free floating sand (9) is dragged by using a mop (10) so that the free floating sand (9) is fully mixed with the second asphalt (7), and finally the complete anti-slipping structure layer (12) is formed; The gap on the surface of the concave-convex framework layer (6) is filled by the mop (10) and the road roller (5); The first asphalt (2) is a cation-containing emulsified asphalt, and the second asphalt (7) is a cation-containing emulsified asphalt.

2. The method of claim 1, wherein, The mop (10) is installed on a construction vehicle for laying the second asphalt (7) and the anti-wear sand (8), the distance between the mop (10) and the output port of the anti-wear sand (8) is between 100-1000 mm, and the mop (10) is arranged behind the output port of the anti-wear sand (8).

3. The method of claim 1, wherein, The specification of the gravel (3) is 3-6 mm, and the gravel (3) is any one or combination of basalt, diabase, bluestone and granite.

4. The method of claim 1, wherein, The specification of the anti-wear sand (8) is 1-2 mm.

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