Seasonal frost heaving thermal insulation control pavement structure

Abstract

The invention discloses a seasonal frost heaving thermal insulation control pavement structure, and belongs to the field of road engineering. The structure comprises an asphalt or concrete surface layer (1), an upper cement stabilized macadam layer (2), an upper sand cushion layer (3), an extruded sheet thermal insulation layer (4), a lower sand cushion layer (5) and a lower cement stabilized macadam layer (6), the extruded sheet thermal insulation layer (4) is a complete thermal insulation layer formed by splicing a plurality of extruded sheet units through mortise and tenon joint structures (7). Through the extruded sheet thermal insulation layer in mortise and tenon connection, heat transfer of the upper layer and the lower layer can be effectively blocked, displacement between the plates is prevented, and local frost heaving caused by a plate joint thermal bridge effect is avoided, so that the overall stability and durability of a pavement structure are remarkably improved, and the prevention and treatment requirements of seasonal frost heaving of pavements in regions with different freezing depths can be met.

Description

Technical Field

[0001] This invention relates to the field of road engineering, and more specifically, to a pavement structure for preventing frost heave in seasonally frozen soil regions, particularly a pavement structure with an extruded polystyrene board insulation layer connected by a tenon and mortise joint. Background Technology

[0002] In frigid regions, seasonal frost heave damage, road surface cracking, roadbed frost heave, thaw settlement, and strength reduction have become the primary factors restricting the service life of roads, seriously affecting traffic performance and long-term durability.

[0003] Traditional prevention and control methods largely rely on drainage and waterproofing, employing high-strength, water-stable materials such as cement-stabilized crushed stone, and low-temperature crack-resistant asphalt pavements, but the effectiveness is limited. In existing technologies, those skilled in the art have also attempted to use industrial waste such as volcanic ash and coal gangue as base materials for insulation to mitigate frost heave. However, practical applications show that this method is limited by the inherent properties of the materials, and its insulation effect is limited, typically only reducing the maximum frost depth by 30-40 cm. For high-altitude and cold regions with greater frost depths, this is insufficient to effectively meet the needs of preventing frost heave damage to road surfaces. Summary of the Invention

[0004] To address the technical problem of seasonal road frost heave, especially in areas with high frost depth, this invention provides a road insulation and frost heave prevention structure with built-in tenon and mortise joints connecting extruded polystyrene boards.

[0005] The technical solution adopted in this invention is: A seasonal frost heave insulation pavement structure includes an asphalt or concrete surface layer (1), an upper cement-stabilized crushed stone layer (2), an upper sand cushion layer (3), an extruded polystyrene (XPS) insulation layer (4), a lower sand cushion layer (5), and a lower cement-stabilized crushed stone layer (6). The XPS insulation layer (4) is characterized by being constructed by splicing multiple XPS units together using a tenon-and-mortise structure (7) to form a complete insulation layer and prevent relative displacement between the unit plates. This structure, with its tenon-and-mortise connection, effectively blocks heat transfer between upper and lower layers and prevents displacement between plates, thereby avoiding localized frost heave caused by thermal bridging at the plate joints and significantly improving the overall stability and durability of the pavement structure. Attached Figure Description

[0006] Figure 1 This is a structural diagram; Figure 2 for Figure 1 A schematic diagram of the decomposition process; In the diagram: 1. Asphalt or concrete surface layer; 2. Upper cement-stabilized crushed stone layer; 3. Upper sand cushion layer; 4. Extruded polystyrene board insulation layer; 5. Lower sand cushion layer; 6. Lower cement-stabilized crushed stone layer; 7. Mortise and tenon joint. Detailed Implementation

[0007] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0008] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0009] The cement-stabilized crushed stone layer (2) is the upper load-bearing structure. Its thickness should meet the requirement that the road load-bearing capacity transfer will not damage the extruded polystyrene insulation layer. The thickness should be 10~30cm. If the surface layer is asphalt, it should also meet the requirement of reducing the thermal impact on the extruded polystyrene insulation layer during asphalt paving. The thickness should be 20~30cm.

[0010] The thickness of the upper sand cushion layer (3) should meet the requirements of further dispersing the concentrated stress transmitted from the upper part, reducing the temperature strain of the upper structure, drainage and preventing the sharp particles of the upper cement-stabilized crushed stone layer (2) from scratching the extruded board insulation layer, and should be 5~10cm.

[0011] The thickness of the lower sand cushion layer (5) should meet the requirements of reducing the temperature strain of the lower structure, drainage and preventing the sharp particles of the lower cement-stabilized crushed stone layer (6) from scratching the extruded polystyrene insulation layer, and should be 5~10cm.

[0012] The thickness of the extruded polystyrene insulation layer (4) should meet the requirements of blocking the transfer of heat and cold from the upper layer, its own load-bearing capacity, and its own bending strength, and should be greater than 10cm. Preferably, in order to prevent horizontal displacement between the upper and lower layers, the extruded polystyrene board should be laid in a single layer.

[0013] The mortise and tenon structure (7) can be rectangular or trapezoidal, preferably trapezoidal, with a tenon width of 45-50mm and a length of 18-20mm.

[0014] The cement-stabilized crushed stone layer (6) is the main load-bearing layer. It is set according to the actual construction requirements and is not specifically restricted in this application.

[0015] It should be noted that the term "comprising," or any other variation thereof, is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0016] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A seasonal frost heave insulation pavement structure, comprising an asphalt or concrete surface layer (1), an upper cement-stabilized crushed stone layer (2), an upper sand cushion layer (3), an extruded polystyrene board insulation layer (4), a lower sand cushion layer (5), and a lower cement-stabilized crushed stone layer (6), characterized in that: The extruded polystyrene insulation layer (4) is formed by splicing multiple extruded polystyrene board units together through a tenon and mortise structure (7) to form a complete insulation layer and prevent relative displacement between the board units.

2. The seasonal frost heave insulation and prevention pavement structure according to claim 1, characterized in that, The thickness of the cement-stabilized crushed stone layer (2) is 10-30cm.

3. The seasonal frost heave insulation and prevention pavement structure according to claim 1, characterized in that, The thickness of the upper sand pad (3) is 5-10cm.

4. The seasonal frost heave insulation and prevention pavement structure according to claim 1 or 3, characterized in that, The thickness of the lower sand pad (5) is 5-10cm.

5. The seasonal frost heave insulation and prevention pavement structure according to claim 1, characterized in that, The thickness of the extruded polystyrene insulation layer (4) is greater than 10cm.

6. The seasonal frost heave insulation and prevention pavement structure according to claim 1, characterized in that, The mortise and tenon structure (7) is a rectangular mortise and tenon or a trapezoidal mortise and tenon.

7. The seasonal frost heave insulation and prevention pavement structure according to claim 6 or 7, characterized in that, The tenon of the mortise and tenon structure (7) has a tenon width of 45-50mm and a length of 18-20mm.

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