A frozen soil area roadbed heat preservation reinforcing structure
Patent Information
- Application Number
- CN202522397984.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-12
- Publication Date
- 2026-09-25
- Estimated Expiration
- 2035-11-12
AI Technical Summary
但是传统技术存在显著局限性：增加路基高度在阻隔外部热量传入的同时，也像“保温毯”一样阻碍了地基内部冷量的释放，可能导致下部冻土反而升温，且成本高昂、生态破坏严重，而铺设EPS等传统隔热层，则因其易受潮变形、抗压性不足，导致保温性能急剧衰退，长期加固效果难以保证
1.采用XPS挤塑聚苯乙烯板作为保温加固板铺设在表层，其闭孔结构吸水率低，配合防水垫，在潮湿环境中仍能长期保持干燥，保温性能不因吸水而衰减，并且其抗压强度达远高于传统使用的EPS隔热材料，可承受上覆荷载，避免传统隔热层因压缩变形导致的保温失效；
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Figure CN224799250U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of highway bridge engineering, and in particular to a roadbed insulation and reinforcement structure in permafrost regions. Background Technology
[0002] Permafrost subgrade engineering refers to the special engineering of constructing road foundations in permafrost regions. Because permafrost is extremely sensitive to temperature, thawing when heated can lead to instability, settlement and deformation of the foundation. The core of the project is to maintain the stability of the permafrost and ensure the long-term safety of the subgrade. Traditional techniques mainly alleviate the problem by increasing the height of the subgrade, replacing it with non-frost-susceptible materials, or laying an insulation layer. However, traditional technologies have significant limitations: while increasing the height of the roadbed blocks the entry of external heat, it also acts like an "insulation blanket" to hinder the release of cold energy inside the foundation, which may cause the underlying frozen soil to warm up instead. Moreover, it is costly and causes serious ecological damage. On the other hand, laying traditional insulation layers such as EPS is prone to moisture and deformation and has insufficient compressive strength, resulting in a sharp decline in insulation performance and making it difficult to guarantee long-term reinforcement effects. Utility Model Content
[0003] The purpose of this application is to provide a roadbed insulation and reinforcement structure for permafrost regions to solve the above-mentioned problems.
[0004] In the first aspect, the technical solution of the roadbed insulation and reinforcement structure in the permafrost region provided in this application is as follows: it includes a main roadbed layer, the surface of which is covered with an insulation and reinforcement board, one side of which is provided with a tenon and the other side of which is provided with a mortise matching the tenon, the bottom surface of which is provided with an anti-slip pad that is laid flat and connected to the surface of the main roadbed layer, and the upper surface of which is covered with a waterproof pad, and the insulation and reinforcement board is fixed to the surface of the main roadbed layer by anchors; By adopting the above technical solution, the thermal insulation reinforcement board is XPS extruded polystyrene board. The manufacturing process of XPS gives it a continuous and uniform closed-cell structure with extremely low water absorption, far lower than EPS. In a humid frozen soil environment, combined with the waterproof pad on the surface of the thermal insulation reinforcement board, the board can remain dry for a long time, and its thermal insulation performance will not decrease significantly due to water absorption, ensuring the long-lasting and stable thermal insulation effect. Furthermore, the compressive strength of XPS extruded polystyrene board can reach 150-700 kPa or more, which is several times that of EPS. This allows the thermal insulation reinforcement board to directly withstand the pressure of the overlying roadbed fill and vehicle dynamic loads without easily undergoing compression deformation. The insulation reinforcement board, through its tenon and mortise joint design, enables modular and rapid installation, improving construction efficiency; the anti-slip pad increases the friction between the insulation reinforcement board and the main subgrade layer, preventing slippage; the waterproof pad effectively prevents moisture penetration, protecting the insulation layer from dampness; and the anchors ensure the firm fixation of the insulation reinforcement board, enhancing the overall structural stability.
[0005] Preferably, the anchor is pre-embedded inside the main subgrade layer, and the upper end of the anchor penetrates through the inside of the edge of the insulation and reinforcement plate to fix the insulation and reinforcement plate to the surface of the main subgrade layer. By adopting the above technical solution, the anchor is pre-embedded inside the main layer of the roadbed, providing a reliable anchoring foundation. The upper end penetrates the edge of the insulation and reinforcement plate, so that the insulation and reinforcement plate is tightly connected to the main layer of the roadbed, preventing the insulation plate from shifting or warping, and improving the durability of the structure.
[0006] Preferably, the anchor consists of a bolt, a pressure plate, and a nut. The lower end of the bolt is pre-embedded inside the main layer of the roadbed, and the upper end of the bolt penetrates inside the edge of the insulation and reinforcement plate. The upper end of the bolt is tightened by the nut to press the pressure plate down along the bolt and fix the edge of the insulation and reinforcement plate. By adopting the above technical solution, the combination of bolts and pressure plates allows for adjustment of the clamping force. By tightening the nut cap, the pressure plate is made to evenly press the edge of the insulation reinforcement plate, avoiding local stress concentration, ensuring the fixing effect, simplifying construction, allowing for repeated adjustments, and making it suitable for different working conditions.
[0007] Preferably, the bottom surface of the pressing plate is provided with an elastic bottom plate for cushioning when the pressing plate presses and fixes the edge of the thermal insulation reinforcement plate; By adopting the above technical solution, the elastic base plate provides a buffering effect when the edge plate is pressed, distributes pressure, prevents the edge of the insulation reinforcement plate from being damaged due to excessive compression, and at the same time enhances the sealing performance and reduces the intrusion of moisture and cold air.
[0008] Secondly, the technical solution of the roadbed insulation and reinforcement structure in the frozen soil area provided in this application is as follows: the surface of the insulation and reinforcement plate is alternately covered with geogrids, and the geogrids are bidirectional geogrids. The nodes of the geogrids are provided with reinforcing blocks and are an integrated structure. The upper and lower surfaces of the geogrids are provided with friction pads and are an integrated structure. By adopting the above technical solutions, the geogrid, as a reinforcing layer, disperses the load, which significantly reduces the pressure transmitted to the underlying insulation and reinforcement plate and the main subgrade layer, thereby improving the bearing capacity and deformation resistance of the subgrade. The reinforcing blocks enhance the strength of the geogrid nodes and prevent geogrid deformation. The friction pads increase the friction between the geogrid and the insulation and reinforcement plate, preventing relative sliding and ensuring the continuity of the geogrid reinforcement effect.
[0009] Preferably, the inside of the geogrid's mesh openings is mechanically reinforced by setting U-shaped nails and the surface of the thermal insulation and reinforcement board; By adopting the above technical solution, U-shaped nails mechanically fix the geogrid and the two adjacent geogrids to the thermal insulation reinforcement plate, preventing multiple geogrids from shifting or rolling up during installation, ensuring the stability and integrity of the geogrid, and further improving the structure's resistance to frost heave and thaw settlement.
[0010] Preferably, a protective layer is also provided on top of the thermal insulation and reinforcement board and the geogrid, and the protective layer is formed by laying crushed stone with a particle size of 5-10cm. By adopting the above technical solution, the crushed stone protective layer disperses the upper load, reduces the direct pressure on the insulation and reinforcement board and geogrid, and provides a good drainage channel to prevent water accumulation and extend the service life of the structure; the thickness of the crushed stone layer is not less than 30cm, ensuring sufficient protection and insulation effect.
[0011] In summary, this application includes at least one of the following beneficial technical effects of roadbed insulation and reinforcement structures in permafrost regions: 1. XPS extruded polystyrene board is used as the insulation reinforcement board and laid on the surface. Its closed-cell structure has a low water absorption rate. When combined with a waterproof pad, it can remain dry for a long time in a humid environment. The insulation performance will not be reduced due to water absorption. Moreover, its compressive strength is much higher than that of traditional EPS insulation materials. It can withstand the load on the top and avoid the insulation failure caused by compression deformation of traditional insulation layers. 2. Modular splicing of insulation boards is achieved through tenons and mortises. Combined with bolts, pressure plates and elastic base plates in the anchors, rapid installation and uniform clamping are achieved, effectively preventing the insulation boards from shifting, improving overall stability, shortening the construction period and reducing the overall construction cost. 3. By alternately laying geogrids on the thermal insulation and reinforcement board and setting up reinforcing blocks, friction pads and U-shaped nails, the overall tensile strength and interfacial friction are enhanced, the load is effectively distributed and the bearing capacity of the subgrade is improved; a crushed stone protective layer is laid on top to further distribute pressure, improve drainage, avoid water accumulation, significantly improve the resistance to frost heave and thaw settlement, and extend the service life of the structure. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application; Figure 2 This is a schematic diagram of the geogrid laying structure in this application; Figure 3 This is a three-dimensional structural diagram of the thermal insulation and reinforcement board of this application; Figure 4 This is a three-dimensional and partially enlarged structural schematic diagram of the anchor of this application; Figure 5 This is a three-dimensional and partially enlarged structural schematic diagram of the geogrid of this application; Explanation of reference numerals in the attached drawings: 1. Main subgrade layer; 2. Thermal insulation and reinforcement board; 21. Tenon; 22. Mortise and tenon groove; 23. Anti-slip mat; 24. Waterproof mat; 3. Anchor; 31. Bolt; 32. Edge plate; 321. Elastic base plate; 33. Nut cap; 4. Geogrid; 41. Reinforcing block; 42. Friction pad; 5. U-shaped nail. Detailed Implementation
[0013] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.
[0014] Example 1: A roadbed insulation and reinforcement structure in permafrost regions, referring to... Figure 1-4 The system includes a roadbed main layer 1, on the surface of which is laid an insulation and reinforcement board 2. One side of the insulation and reinforcement board 2 is provided with a tenon 21, and the other side of the insulation and reinforcement board 2 is provided with a mortise 22 that matches the tenon 21. The bottom surface of the insulation and reinforcement board 2 is provided with an anti-slip pad 23 that is laid flat and connected to the surface of the roadbed main layer 1. The upper surface of the insulation and reinforcement board 2 is covered with a waterproof pad 24. The insulation and reinforcement board 2 is fixed to the surface of the roadbed main layer 1 by anchors 3. The insulation reinforcement board 2 is made of XPS extruded polystyrene board. The manufacturing process of XPS gives it a continuous and uniform closed-cell structure with extremely low water absorption, far lower than EPS. In humid frozen soil environments, combined with the waterproof pad 24 on the surface of the insulation reinforcement board 2, the insulation reinforcement board 2 can remain dry for a long time, and its thermal insulation performance will not decrease significantly due to water absorption, ensuring the long-lasting and stable thermal insulation effect. In addition, the compressive strength of XPS extruded polystyrene board can reach 150-700kPa or more, which is 2 to 5 times that of EPS. This allows the insulation reinforcement board 2 to directly withstand the pressure of the overlying roadbed fill and vehicle dynamic loads without easily undergoing compression deformation. The insulation reinforcement board 2, through the splicing design of tenon 21 and mortise 22, achieves modular and rapid installation, improving construction efficiency; the anti-slip pad 23 increases the friction between the insulation reinforcement board 2 and the main subgrade layer 1, preventing slippage; the waterproof pad 24 effectively prevents water penetration and protects the insulation layer from moisture; the anchor 3 ensures the firm fixation of the insulation reinforcement board 2 and enhances the stability of the overall structure.
[0015] Preferably, the anchor 3 is pre-embedded inside the main subgrade layer 1, and the upper end of the anchor 3 penetrates through the inside of the edge of the insulation and reinforcement plate 2 to fix the insulation and reinforcement plate 2 to the surface of the main subgrade layer 1. Anchor 3 is pre-embedded inside the main subgrade layer 1, providing a reliable anchoring foundation. Its upper end penetrates the edge of the insulation and reinforcement plate 2, making the insulation and reinforcement plate 2 tightly connected to the main subgrade layer 1, preventing the insulation plate from shifting or warping, and improving the durability of the structure.
[0016] Preferably, the anchor 3 consists of a bolt 31, a pressure plate 32, and a nut 33. The lower end of the bolt 31 is pre-embedded inside the main subgrade layer 1, and the upper end of the bolt 31 penetrates inside the edge of the insulation and reinforcement plate 2. The upper end of the bolt 31 is tightened by the nut 33 to press the pressure plate 32 down along the bolt 31 to press and fix the edge of the insulation and reinforcement plate 2. The combination of bolt 31 and pressure plate 32 allows for adjustment of the clamping force. By tightening the nut cap 33, the pressure plate 32 is made to evenly press the edge of the insulation reinforcement plate 2, avoiding local stress concentration, ensuring the fixing effect, and making construction simple, allowing for repeated adjustments, and suitable for different working conditions.
[0017] Preferably, the bottom surface of the pressing plate 32 is provided with an elastic bottom plate 321, which is used for buffering when the pressing plate 32 presses and fixes the edge of the thermal insulation reinforcement plate 2. The elastic base plate 321 provides a buffering effect when the pressure plate 32 is pressed, distributes the pressure, prevents the edge of the insulation reinforcement plate 2 from being damaged due to excessive compression, and at the same time enhances the sealing performance and reduces the intrusion of moisture and cold air.
[0018] The construction principle of this application embodiment is as follows: First, bolts 31 are pre-embedded on the compacted main roadbed layer 1. The upper end of the bolts 31 penetrates the edge of the insulation and reinforcement plate 2. The insulation and reinforcement plate 2 is laid on the surface of the main roadbed layer 1. Modular connection is achieved by splicing the tenons 21 and mortises 22 between two adjacent insulation and reinforcement plates 2, ensuring that the insulation and reinforcement plates 2 are tightly spliced together. When the thermal insulation reinforcement plate 2 is laid on the surface of the main subgrade layer 1, the anti-slip pad 23 at the bottom of the thermal insulation reinforcement plate 2 contacts the surface of the main subgrade layer 1 to increase friction and prevent slippage. The waterproof pad 24 on the upper surface plays a role in moisture prevention. Then, by tightening the nut cap 33 on the top of the bolt 31, the tightening nut cap 33 pushes the pressing plate 32 downward to press and fix the edge of the thermal insulation reinforcement plate 2. The elastic bottom plate 321 at the bottom of the pressing plate 32 provides buffering to avoid local stress concentration, thereby firmly fixing the thermal insulation reinforcement plate 2 to the main subgrade layer 1.
[0019] Example 2: A roadbed insulation and reinforcement structure in permafrost regions, referring to... Figure 2 and 5 The surface of the thermal insulation and reinforcement board 2 is alternately covered with geogrid 4, and the geogrid 4 is a bidirectional geogrid. The nodes of the geogrid 4 are equipped with reinforcing blocks 41 and are integrated structures. The upper and lower surfaces of the geogrid 4 are equipped with friction pads 42 and are integrated structures. As a reinforcing layer, the geogrid 4 disperses the load, which significantly reduces the pressure transmitted to the underlying insulation and reinforcement plate 2 and the main subgrade layer 1, thereby improving the bearing capacity and deformation resistance of the subgrade. The reinforcing block 41 enhances the strength of the geogrid nodes and prevents the geogrid from deforming. The friction pad 42 increases the friction between the geogrid 4 and the insulation and reinforcement plate 2, preventing relative sliding and ensuring the continuity of the reinforcement effect of the geogrid 4.
[0020] Preferably, the inside of the mesh of the geogrid 4 is mechanically reinforced with the surface of the thermal insulation and reinforcement plate 2 by setting U-shaped nails 5; U-shaped nails 5 mechanically fix the geogrid 4 and the two adjacent geogrids 4 to the thermal insulation and reinforcement plate 2, preventing multiple geogrids 4 from shifting or rolling up during installation, ensuring the stability and integrity of the geogrid 4, and further improving the structure's resistance to frost heave and thaw settlement.
[0021] Preferably, a protective layer is also covered on top of the thermal insulation and reinforcement board 2 and the geogrid 4. The protective layer is formed by laying crushed stone with a particle size of 5-10cm. The protective layer of crushed stone disperses the upper load, reduces the direct pressure on the insulation and reinforcement board 2 and the geogrid 4, and provides a good drainage channel to prevent moisture accumulation and extend the service life of the structure; the thickness of the crushed stone layer is not less than 30cm, ensuring sufficient protection and insulation effect.
[0022] The construction principle of this application embodiment is as follows: Based on embodiment 1, geogrid 4 is alternately laid on the thermal insulation and reinforcement board 2. The geogrid 4 is a bidirectional geogrid with reinforcing blocks 41 at its nodes and friction pads 42 on both the upper and lower surfaces to enhance the friction with the thermal insulation and reinforcement board 2 and the overall strength; U-shaped nails 5 are used to pass through the mesh holes of the geogrid 4 to mechanically fix the geogrid 4 to the thermal insulation and reinforcement board 2 to prevent displacement or roll-up; Finally, a protective layer is placed over the insulation and reinforcement board 2 and the geogrid 4. The protective layer is formed by laying crushed stone with a particle size of 5-10cm and a thickness of not less than 30cm to distribute the load, provide drainage and extend the service life of the structure.
[0023] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.
Claims
1. A roadbed insulation and reinforcement structure for permafrost regions, comprising a main roadbed layer (1), wherein the surface of the main roadbed layer (1) is covered with an insulation and reinforcement board (2), characterized in that, The insulation and reinforcement board (2) has a tenon (21) on one side and a mortise (22) matching the tenon (21) on the other side. The bottom surface of the insulation and reinforcement board (2) is provided with an anti-slip pad (23) which is laid flat and connected to the surface of the roadbed main layer (1). The upper surface of the insulation and reinforcement board (2) is covered with a waterproof pad (24). The insulation and reinforcement board (2) is fixed to the surface of the roadbed main layer (1) by anchors (3).
2. The roadbed insulation and reinforcement structure in permafrost areas according to claim 1, characterized in that, The anchor (3) is pre-embedded inside the main subgrade layer (1), and the upper end of the anchor (3) penetrates through the edge of the insulation and reinforcement plate (2) to fix the insulation and reinforcement plate (2) to the surface of the main subgrade layer (1).
3. The roadbed insulation and reinforcement structure in permafrost areas according to claim 2, characterized in that, The anchor (3) consists of a bolt (31), a pressure plate (32) and a nut (33). The lower end of the bolt (31) is pre-embedded inside the main body layer (1) of the roadbed, and the upper end of the bolt (31) penetrates the inside of the edge of the thermal insulation reinforcement plate (2). The upper end of the bolt (31) is tightened by the nut (33) to press the pressure plate (32) down along the bolt (31) to press and fix the edge of the thermal insulation reinforcement plate (2).
4. The roadbed insulation and reinforcement structure in permafrost areas according to claim 3, characterized in that, The bottom surface of the pressing plate (32) is provided with an elastic bottom plate (321) for buffering when the pressing plate (32) presses and fixes the edge of the heat insulation and reinforcement plate (2).
5. The roadbed insulation and reinforcement structure in permafrost areas according to claim 2, characterized in that, The surface of the thermal insulation and reinforcement board (2) is alternately covered with geogrid (4), and the geogrid (4) is a bidirectional geogrid. The nodes of the geogrid (4) are provided with reinforcing blocks (41) and are integrated structures. The upper and lower surfaces of the geogrid (4) are provided with friction pads (42) and are integrated structures.
6. The roadbed insulation and reinforcement structure in permafrost areas according to claim 5, characterized in that, The inside of the geogrid (4) is mechanically reinforced with U-shaped nails (5) and the surface of the thermal insulation and reinforcement plate (2).
7. The roadbed insulation and reinforcement structure in permafrost areas according to claim 6, characterized in that, The insulation and reinforcement board (2) and the geogrid (4) are also covered with a protective layer, which is formed by laying crushed stone with a particle size of 5-10cm.