Roadbed structure for expressway in frozen soil area
By designing a layer-by-layer reduction insulation control structure of gravel layers, heat insulation panels, ventilation ducts, hot rods and filling layers in the freezing highway subgrade in the frozen soil area, the problem of road diseases caused by the increase in heat in the frozen soil is solved, and the effect of effectively reducing the temperature of the frozen soil and reducing heat transfer is achieved.
Patent Information
- Application Number
- CN202421614527.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-05-09
- Estimated Expiration
- 2034-07-09
AI Technical Summary
The highway roadbed in the frozen soil area has increased heat, causing diseases on the road. The prior art such as ventilation ducts and hot rods cannot effectively block heat transfer.
A roadbed structure is designed, including gravel layer, heat insulation board, ventilation duct, heat rod and filling layer. Through the decreasing insulation control structure and the embedded reinforcement structure, the heat receiving of the frozen soil is reduced and the heat transfer is reduced.
It effectively reduces the temperature of the permafrost, reduces the downward transfer of heat, avoids road diseases caused by the continuous rise in the permafrost temperature, and improves the normal operation capacity of expressways in the permafrost area.
Smart Images
Figure CN222847145U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of roadbeds in frozen soil areas, in particular to a roadbed structure for expressways in frozen soil areas. Background Art
[0002] my country's permafrost is mainly distributed in the Qinghai-Tibet Plateau, the Greater and Lesser Khingan Mountains in the northeast, the northern part of the Songnen Plain and the western mountains. The permafrost areas have long-term low temperatures, a fast cooling rate, and a large temperature difference between day and night. In addition, the special engineering properties of permafrost result in many diseases such as longitudinal cracks, uneven settlement, and rutting in permafrost areas, which greatly reduce the construction quality and service level of roads. The disturbance of permafrost by highway construction projects directly aggravates the melting of permafrost within the influence range of highways, resulting in frequent roadbed and pavement diseases, which seriously affects the normal operation of highways in permafrost areas.
[0003] In order to avoid the occurrence of highway diseases caused by the melting of frozen soil in the frozen soil foundation, the existing technology usually adopts ventilation pipe roadbed or heat rod roadbed to maintain the frozen soil structure. However, the ventilation pipe can only reduce the temperature in the roadbed soil and has little effect on the protection of the frozen soil layer. The heat rod can dissipate the heat in the frozen soil foundation to a certain extent, but cannot block the heat transfer from the roadbed soil to the frozen soil layer. Utility Model Content
[0004] The utility model aims to provide a roadbed structure for highways in frozen soil areas, so as to solve the problem that the heat increase of the frozen soil layer may cause highway diseases as mentioned in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a roadbed structure for a highway in a frozen soil area, comprising a crushed stone layer, wherein the crushed stone layer is located at the bottom layer, and is characterized in that it also comprises a heat insulation board 1, wherein the heat insulation board 1 is laid on the upper surface of the crushed stone layer, and a heat preservation control structure is arranged on the upper surface of the heat insulation board 1, and the heat preservation control structure can cool down and dissipate heat of the internal soil layer through a ventilation pipe and a heat rod 1 in cooperation with a filling layer.
[0006] Preferably, the thermal insulation control structure includes a rammed soil layer, which is laid on the upper surface of the insulation board one, a crushed stone layer is provided on the upper surface of the rammed soil layer, and ventilation pipes are provided at equal intervals on the upper surface of the crushed stone layer, a filling layer is filled and laid between the ventilation pipes, a crushed stone layer is laid on the upper surface of the filling layer, and the insulation board two is provided on the upper surface of the crushed stone layer, a rammed soil layer is provided on the upper surface of the insulation board two, heat rod one is obliquely penetrated on both sides of the rammed soil layer, and a concrete layer is laid on the upper surface of the rammed soil layer, and a plurality of heat rods one are provided at equal intervals.
[0007] By adopting the above technical solution, the lower layer of Jiangxi is insulated by two pairs of insulation boards to reduce heat transfer.
[0008] Preferably, the filling layer is made of coarse-grained soil.
[0009] By adopting the above technical solution, coarse-grained soil is insensitive to frost heave, and the ventilation pipe can be protected from the influence of frost heave.
[0010] Preferably, the second insulation board is made of XPS insulation board made of polystyrene resin.
[0011] The adoption of the technical solution can achieve better heat insulation effect.
[0012] Preferably, the first insulation board is connected to a pre-buried reinforcement structure, and the pre-buried reinforcement structure can reinforce the second heat rod by reserving an opening through a pre-buried pipe.
[0013] The adoption of the technical solution facilitates the installation of the second heat rod.
[0014] Preferably, the embedded reinforcement structure includes a reinforcement layer, which is laid on the upper surface of the insulation board 1, and the side surface of the reinforcement layer is connected to the side surface of the compacted soil layer. The upper surface of the insulation board 1 is penetrated by an embedded pipe, the upper surface of the bottom gravel layer is provided with a drainage ditch, and the side surface of the drainage ditch is connected to the reinforcement layer, and the upper surface of the embedded pipe is penetrated by a heat rod 2.
[0015] By adopting the above technical solution, the bottom layer of frozen soil is cooled by heat rod 2.
[0016] Preferably, filler is filled between the embedded pipe and the second heat rod.
[0017] The adoption of the above technical solution makes the hot rod 2 more stable.
[0018] Compared with the prior art, the utility model has the following beneficial effects: the subgrade structure for highways in frozen soil areas:
[0019] 1. The roadbed structure for the highway in the frozen soil area is provided with a heat preservation control structure. Ventilation pipes are arranged at equal intervals between the middle gravel layers of the roadbed. The ground temperature is lowered by forced convection heat exchange between the ventilation pipes, so that the frozen soil is cooled. The heat insulation board can reduce the temperature transmitted downward, so as to avoid the continuous rise of the frozen soil temperature and cause damage to the highway;
[0020] 2. Furthermore, a filling layer is provided between the ventilation pipes. The filling layer is made of coarse-grained soil that is insensitive to frost heave, so that the filling layer can be prevented from being affected by frost heave and the surface affects the ventilation pipes. In addition, gravel layers are laid on the upper and lower layers of the filling layer, which can enhance the bearing capacity of the ventilation pipes.
[0021] 3. Furthermore, a heat rod 1 is obliquely inserted between the upper rammed soil layers to reduce the heat between the rammed soil layers, thereby reducing the heat transfer downward. An insulation board 2 is arranged in the lower layer of the rammed soil layer to further weaken the heat transfer to the lower layer, thereby greatly reducing the heat transfer to the base frozen soil. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 This is a schematic diagram of the shaft side surface structure of the utility model;
[0023] Figure 2 This is a schematic diagram of the front cross-sectional structure of the heat rod of the utility model;
[0024] Figure 3 This is a schematic diagram of the front sectional structure of the utility model on the axial side;
[0025] Figure 4 This is a schematic diagram of the local structure of the embedded pipe of the utility model;
[0026] Figure 5 It is a schematic diagram of the side sectional structure of the utility model.
[0027] In the figure: 1. Gravel layer; 2. Insulation board 1; 3. Drainage ditch; 4. Rammed earth layer; 5. Reinforcement layer; 6. Insulation board 2; 7. Concrete layer; 8. Heat rod 1; 9. Ventilation pipe; 10. Filling layer; 11. Heat rod 2; 12. Embedded pipe; 13. Filler. DETAILED DESCRIPTION
[0028] 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.
[0029] See also Figure 1-5 The utility model provides a technical solution: a roadbed structure for a highway in a frozen soil area, comprising a crushed stone layer 1, a heat insulation board 2, a drainage ditch 3, a compacted soil layer 4, a reinforcement layer 5, a heat insulation board 6, a concrete layer 7, a heat rod 8, a ventilation pipe 9, a filling layer 10, a heat rod 11, an embedded pipe 12, and a filler 13.
[0030] Example 1
[0031] The subgrade structure for the highway in the frozen soil area is provided with a heat preservation control structure, which can reduce the heat conducted to the base frozen soil layer by layer through the ventilation pipe 9 and the heat rod 8, specifically:
[0032] The gravel layer 1 is located at the bottom layer and also includes an insulation board 2, which is laid on the upper surface of the gravel layer 1. The upper surface of the insulation board 2 is provided with a thermal insulation control structure, which can cool and dissipate the internal soil layer through the ventilation pipe 9 and the heat rod 8 in cooperation with the filling layer 10. The thermal insulation control structure includes a rammed soil layer 4, which is laid on the upper surface of an insulation board 2, a crushed stone layer 1 is arranged on the upper surface of the rammed soil layer 4, and ventilation pipes 9 are arranged at equal intervals on the upper surface of the crushed stone layer 1, a filling layer 10 is filled and laid between the ventilation pipes 9, a crushed stone layer 1 is laid on the upper surface of the filling layer 10, and an insulation board 6 is arranged on the upper surface of the crushed stone layer 1, and a rammed soil layer 4 is arranged on the upper surface of the insulation board 6, and a heat rod 8 is obliquely penetrated on both sides of the rammed soil layer 4, and a concrete layer 7 is laid on the upper surface of the rammed soil layer 4, and a plurality of heat rods 8 are arranged at equal intervals, the filling layer 10 uses coarse-grained soil, and the insulation board 6 uses an XPS insulation board made of polystyrene resin;
[0033] When laying the roadbed structure, first, a crushed stone layer 1 is laid on the upper surface of the base frozen soil. When laying the crushed stone layer 1, the crushed stones are first laid evenly, and then the roller is used to repeatedly roll and level them. Then, a chip spreader is used to evenly spread the dry filling material on the compacted coarse crushed stones, and then a vibrating roller is used to roll them so that the filling material fills the crushed stones completely. Then, after the laying of the crushed stone layer 1 is completed, an insulation board 2 is laid on the upper layer. The insulation board 2 uses an XPS insulation board made of polystyrene resin as a raw material, and has a better insulation effect. A compacted soil layer 4 is laid above the insulation board 2. The soil gap of the compacted soil layer 4 is small, which increases the density of the soil and improves the compressive strength and stability of the roadbed. The crushed stone layer 1 is laid again on the upper layer of the compacted soil layer 4 to improve the supporting force of the roadbed. Then, ventilation pipes 9 are evenly spaced above the crushed stone layer 1, and coarse-grained concrete is used between the ventilation pipes 9. A filling layer 10 of soil material is located between the ventilation pipes 9. Coarse-grained soil is a soil that is not sensitive to frost heave. It can protect the ventilation pipes 9 between the ventilation pipes 9. The external airflow and the internal airflow are convectively exchanged through the ventilation pipes 9 to cool the inside of the roadbed. Then, a crushed stone layer 1 is laid again above the ventilation pipes 9 and the filling layer 10, and an insulation board 6 is laid on the upper surface of the crushed stone layer 1 for further insulation. Then, a compacted soil layer 4 is laid on the upper surface of the insulation board 6 to improve the compressive strength and stability of the upper layer of the roadbed. A heat rod 8 is obliquely arranged on the side of the compacted soil layer 4. During installation, the compacted soil layer 4 is first drilled by a drilling machine, and then the heat rod 8 is inserted. The heat rod 8 can stably cool the heat of the upper layer, thereby reducing the heat transferred downward. Finally, a concrete layer 7 is laid on the compacted soil layer 4 as the uppermost layer.
[0034] Example 2
[0035] The subgrade structure for the highway in the frozen soil area is also provided with a pre-buried reinforcement structure, and the heat rod 11 is installed through the pre-buried pipe 12 to dissipate heat to the bottom frozen soil base layer, specifically:
[0036] The heat insulation board 1 2 is connected with a pre-buried reinforcement structure, which can be reinforced by pre-buried pipes 12 after reserving openings for the heat rod 2 11. The pre-buried reinforcement structure includes a reinforcement layer 5, which is laid on the upper surface of the heat insulation board 1 2 and provided with the reinforcement layer 5. The side surface of the reinforcement layer 5 is connected to the side surface of the compacted soil layer 4. The upper surface of the heat insulation board 1 2 is penetrated by the pre-buried pipe 12, the upper surface of the bottom gravel layer 1 is provided with a drainage ditch 3, and the side surface of the drainage ditch 3 is connected to the reinforcement layer 5. The upper surface of the pre-buried pipe 12 is penetrated by the heat rod 2 11, and the space between the pre-buried pipe 12 and the heat rod 2 11 is filled with filler 13;
[0037] Pre-buried pipes 12 are arranged at equal intervals on both sides of the upper surface of the insulation board 2, and reinforcement layers 5 are arranged around the pre-buried pipes 12 on both sides of the insulation board 2. The reinforcement layer 5 is located between the drainage ditch 3 and the compacted soil layer 4 on the upper surface of the insulation board 2. The reinforcement layer 5 is made of gravel granular material, and the pre-buried pipes 12 are filled around. Then, when the heat rod 11 is installed, the pre-buried pipes 12 are directly penetrated through the insulation board 2 to insert into the most basic frozen soil. The pre-buried pipes 12 can avoid damage to the insulation board 2 during drilling. After the heat rod 11 is inserted, filler 13 is filled between the pre-buried pipe 12 and the heat rod 11. The filler 13 is made of silty clay, which has a stronger viscosity reinforcement force. Therefore, the heat rod 11 can be reinforced by the filler 13. A drainage ditch 3 is arranged on the upper surface of the gravel layer 1 for drainage. The heat of the base frozen soil is dissipated by the heat rod 11, which can reduce the road hazards caused by frost heave.
[0038] Working principle: When using the roadbed structure for highways in frozen soil areas, a thermal insulation control structure is provided, which can reduce the temperature transmitted layer by layer through the heat rod 8 and the ventilation pipe 9, thereby reducing the heating of the frozen soil. A pre-buried reinforcement structure is also provided, and the pre-buried pipe 12 facilitates the installation of the heat rod 11, thereby increasing the overall practicality.
[0039] 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 roadbed structure for a highway in a frozen soil region, comprising a crushed stone layer (1), wherein the crushed stone layer (1) is located at the bottom layer, and characterized in that: It also includes a heat insulation board (2), the heat insulation board (2) being laid on the upper surface of the gravel layer (1), and a heat insulation control structure being provided on the upper surface of the heat insulation board (2), and the heat insulation control structure being able to cool down and dissipate heat from the internal soil layer through a ventilation pipe (9) and a heat rod (8) in cooperation with a filling layer (10).
2. A roadbed structure for a highway in a frozen soil region according to claim 1, characterized in that: The thermal insulation control structure comprises a rammed soil layer (4), the rammed soil layer (4) is laid on the upper surface of the first insulation board (2), a crushed stone layer (1) is arranged on the upper surface of the rammed soil layer (4), and ventilation pipes (9) are arranged at equal intervals on the upper surface of the crushed stone layer (1), a filling layer (10) is filled and laid between the ventilation pipes (9), the upper surface of the filling layer (10) is laid with a crushed stone layer (1), and the upper surface of the crushed stone layer (1) is provided with a second insulation board (6), the upper surface of the second insulation board (6) is provided with a rammed soil layer (4), both sides of the rammed soil layer (4) are obliquely penetrated by a first heat rod (8), and a concrete layer (7) is laid on the upper surface of the rammed soil layer (4), and a plurality of the first heat rods (8) are arranged at equal intervals.
3. A roadbed structure for a highway in a frozen soil region according to claim 2, characterized in that: The filling layer (10) is made of coarse-grained soil.
4. A roadbed structure for a highway in a frozen soil region according to claim 2, characterized in that: The second insulation board (6) is an XPS insulation board made of polystyrene resin.
5. The roadbed structure for a highway in a frozen soil region according to claim 2, characterized in that: The first heat insulation board (2) is connected to a pre-buried reinforcement structure, and the pre-buried reinforcement structure can reinforce the second heat rod (11) by reserving an opening through a pre-buried pipe (12).
6. A roadbed structure for a highway in a frozen soil region according to claim 5, characterized in that: The pre-buried reinforcement structure comprises a reinforcement layer (5), the reinforcement layer (5) being arranged on the upper surface of the first heat insulation board (2), the side surface of the reinforcement layer (5) being connected to the side surface of the compacted soil layer (4), the upper surface of the first heat insulation board (2) being penetrated by a pre-buried pipe (12), the upper surface of the bottommost gravel layer (1) being provided with a drainage ditch (3), and the side surface of the drainage ditch (3) being connected to the reinforcement layer (5), and the upper surface of the pre-buried pipe (12) being penetrated by a second heat rod (11).
7. A roadbed structure for a highway in a frozen soil region according to claim 6, characterized in that: A filler (13) is filled between the embedded pipe (12) and the second heat rod (11).