Self-control cold air storage frozen soil roadbed

Abstract

The utility model relates to the technical field of frozen soil engineering, in particular to a self-control cold air storage frozen soil roadbed which comprises an air cooling regulation and control unit, a control unit, a power supply unit, an automatic temperature control air door and an inner temperature probe. The air cooling regulation and control unit comprises phase-change heat exchange cold storage bodies, an air cooling box body and air pipes, the multiple phase-change heat exchange cold storage bodies are evenly distributed in the air cooling box body at intervals, and the multiple air pipes communicated with the external environment are arranged on the side wall of the outer side of the air cooling box body; an inner temperature probe is arranged on the inner side of the air cooling box body, an outer temperature probe for measuring the external environment temperature is arranged on the outer side of the air cooling box body, and an automatic temperature control air door is installed at the end, located on the outer side of the air cooling box body, of each air pipe. By means of the external air cooling control system, through comprehensive utilization of modes such as automatic temperature control sensing, forced convection and phase change energy storage slow release heat absorption, and through effective work of the air cooling regulation and control unit, the purposes of efficient and intelligent cooling and long-term stability of the frozen soil roadbed are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of frozen soil engineering, in particular to a self-controlled cold-storage frozen soil roadbed. Background Art

[0002] In the permafrost areas of my country such as the Qinghai-Tibet Plateau and Northeast China, through long-term evolution, development and change, thick underground ice with various shapes and thicknesses of several meters or even more than ten meters has been formed. With the changes in climate and environment and the impact of human engineering activities, the permafrost and underground ice will degenerate and melt, leading to various engineering disasters and having an important impact on the stability of various major engineering buildings.

[0003] Actively cooling the frozen soil foundation through the adoption of frozen soil protection engineering measures is a key way to ensure the long-term safe operation and stability of frozen soil engineering. Since the strength of frozen soil is closely related to temperature, its strength can increase exponentially as the temperature of frozen soil continues to decrease. Under low temperature conditions, the frozen soil foundation can be as hard as a rock, and under high temperature or close to 0°C, it can also be as soft as a soft soil foundation. Therefore, by applying frozen soil protection engineering measures in the frozen soil foundation, by reducing the frozen soil temperature to varying degrees and continuously gathering cold energy into the foundation, the purpose of maintaining the long-term stability of the frozen soil foundation can be well achieved. Therefore, for an engineering measure to protect frozen soil, its cooling efficiency, or the overall regulation efficiency of the ground temperature field of the frozen soil foundation, is the key to the success or failure of maintaining the long-term stability of the roadbed.

[0004] Measures such as block-stone-based roadbed are one of the important engineering measures to protect permafrost foundations. They mainly achieve cooling of the frozen soil foundation through the different thermal conductivity of the block-stone layer in cold and warm seasons, and have played an important role in frozen soil projects such as the Qinghai-Tibet Railway. However, with the continuous intensification of warming and humidification on the Qinghai-Tibet Plateau, the rate of frozen soil degradation and melting has doubled, posing a major threat to the stability of the frozen soil foundation. Actual observation results show that the cooling efficiency of this measure is now difficult to meet the actual engineering needs, especially under highway conditions. The efficiency is even worse, or it has no cooling efficiency. Since the Qinghai-Tibet Railway and the world's first Qinghai Gonghe-Yushu Expressway have adopted a large number of block-stone-based roadbed structures in frozen soil areas, engineering diseases such as uneven settlement and cracking of the roadbed have continued to appear in large numbers, posing a serious threat to engineering stability and driving safety. Utility Model Content

[0005] The utility model provides a self-controlled cold-storage frozen soil roadbed, which overcomes the shortcomings of the prior art and can effectively solve the problem of poor cooling effect of the block stone roadbed set in the existing frozen soil roadbed.

[0006] In order to solve the above problems, the utility model discloses an automatic cold storage air-frozen soil roadbed, which includes an air-cooling control unit, a control unit, a power supply unit, an automatic temperature control damper and an internal temperature probe;

[0007] The air-cooling control unit includes a phase-change heat storage body, an air-cooling box and an air duct. A plurality of phase-change heat storage bodies are evenly spaced inside the air-cooling box, and a plurality of air ducts connected to the external environment are arranged on the outer side wall of the air-cooling box. An internal temperature probe is arranged inside the air-cooling box, and an external temperature probe for measuring the external ambient temperature is arranged outside the air-cooling box. An automatic temperature control damper is installed at one end of each air duct located outside the air-cooling box, and the automatic temperature control damper, the internal temperature probe and the external temperature probe are all connected to the control unit.

[0008] The air-cooling box body is a hollow structure consisting of a top plate, a bottom plate and an outer partition plate, and supporting columns are arranged at intervals inside the air-cooling box body.

[0009] The end of the air duct located outside the air cooling box is tilted, and the angle between the inclined section of the duct opening and the vertical perpendicular direction is 0-45°.

[0010] The above-mentioned phase change heat storage body is a thin-shell sealed container, and the phase change temperature range of the phase change material therein is 0°C~-15°C.

[0011] The control unit includes a control module and a signal transmission module, and the control module is connected to the signal transmission module; or / and, the power supply unit also includes a battery, the solar photovoltaic panel is connected to the battery, and the battery is connected to the control unit.

[0012] The above also includes water-proof geotextile and thermal insulation material. The thermal insulation material is arranged above the air-cooling control unit, and the water-proof geotextile is arranged above the thermal insulation material.

[0013] Through the external air cooling control system of the utility model, through the comprehensive utilization of automatic temperature control perception, forced convection, phase change energy storage and slow release heat absorption and other modes, and through the effective operation of the air cooling control unit, the purpose of efficient, intelligent cooling and long-term stability of the frozen soil roadbed is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0015] Figure 1 It is a plan view of an embodiment of the utility model.

[0016] Figure 2 It is a front view of the air cooling control unit in the embodiment of the utility model.

[0017] Figure 3 for Figure 1 Schematic diagram of the cross section of the middle AA` roadbed.

[0018] Figure 4 for Figure 1 Schematic diagram of the cross section of the middle BB` roadbed.

[0019] In the figure: 1-automatic temperature control damper, 2-internal temperature probe, 3-phase change heat storage body, 4-air cooling box, 5-air duct, 6-support column, 7-waterproof geotextile, 8-insulation material, 9-roadbed, 10-solar photovoltaic panel, 11-external temperature probe, 12-control module, 13-signal transmission module, 14-battery. DETAILED DESCRIPTION

[0020] The present invention is not limited by the following embodiments, and specific implementation methods can be determined according to the technical solution of the present invention and actual conditions.

[0021] The present invention is further described below in conjunction with the embodiments and drawings:

[0022] like Figure 1-2 As shown, a self-controlled cold storage air-frozen soil roadbed includes an air-cooling control unit, a control unit, a power supply unit, an automatic temperature control damper 1 and an internal temperature probe 2;

[0023] The power supply unit includes a solar photovoltaic panel 10 located above the roadbed slope; the power supply unit is connected to the control unit;

[0024] The air cooling control unit includes a phase change heat storage body 3, an air cooling box 4 and an air duct 5. A plurality of phase change heat storage bodies 3 are evenly spaced inside the air cooling box 4, and a plurality of air ducts 5 connected to the external environment are arranged on the outer side wall of the air cooling box 4; an internal temperature probe 2 is arranged on the inner side of the air cooling box 4, and an external temperature probe 11 for measuring the external environment temperature is arranged on the outer side of the air cooling box 4. An automatic temperature control damper 1 is installed at one end of each air duct 5 located on the outer side of the air cooling box 4, and the automatic temperature control damper 1, the internal temperature probe 2 and the external temperature probe 11 are all connected to the control unit.

[0025] During installation, the air cooling control unit is horizontally located inside the roadbed 9 as a whole, with the bottom at a height of 0 to 1.0 m from the original natural surface. It can be set inside the roadbed 9 fill when the roadbed 9 is filled to a certain height.

[0026] The above-mentioned automatic temperature control damper 1 may be an existing well-known technology, which may contain a temperature intelligent sensing system, which may be electronic or mechanical, wherein the mechanical type is an automatic temperature control damper composed of an induction transmission device such as a temperature control memory alloy (the inventor's authorized patents 201610152042.6, 201010241354.7, 200510065354.5, etc. can all achieve mechanical control). Both methods can automatically sense seasonal changes and ambient temperature changes.

[0027] Among them, when the automatic temperature control damper is electronic, it can be controlled to open and close by the control unit, and the control unit includes a control module 12 and a signal transmission module 13, and the control module 12 is connected to the signal transmission module 13. The control module 12 can be an existing well-known technology, which is used to compare and judge the received temperature according to the temperature in the air-cooling control unit measured in real time by the internal temperature probe 2, and the external environment temperature data collected in real time by the external temperature probe 11, and control the opening and closing of the automatic temperature control damper 1 according to the established negative temperature (set in the control module 12); through the signal transmission module 13, the signal of the control module 12 is transmitted to the remote host computer (which can be a terminal control device such as a computer, a tablet, a mobile phone, etc.), so as to facilitate the remote viewing of the temperature signal in the air-cooling box 4 and control of the entire system.

[0028] The power supply unit further includes a battery 14 , the solar photovoltaic panel 10 is connected to the battery 14 , and the battery 14 is connected to the control unit.

[0029] The above-mentioned solar photovoltaic panel 10 is an existing well-known technology, which can directly or indirectly convert solar radiation into electrical energy through photoelectric effect or photochemical effect, and the converted electrical energy is stored in the battery 14; when power supply is not needed, the solar photovoltaic panel 10 is used to charge the battery 14, so that the battery 14 can be used as a backup power source for power supply when the solar photovoltaic panel 10 has no power output.

[0030] like Figure 1 As shown, the air-cooling box body 4 is a hollow structure consisting of a top plate, a bottom plate and an outer partition plate, and support columns 6 are arranged at intervals inside the air-cooling box body 4.

[0031] Among them, the air-cooling box 4 is a hollow closed structure, and its shape can be a rectangular parallelepiped, a cylindrical shape, or a combination thereof, with a thickness of 10cm~50cm. The outer shell of the air-cooling box 4 is a prefabricated concrete part, or it can be a metal component. The load-bearing structure is formed by the top plate, the bottom plate and the outer partition to meet the load-bearing requirements of the roadbed 9 and ensure its overall compressive strength; the supporting columns 6 adopt a concrete or steel frame structure with high strength. The supporting columns 6 are evenly arranged at a certain interval to provide sufficient space for the phase change heat storage body 3, and at the same time form a natural channel to enhance the convective heat exchange of the air in the air-cooling box 4.

[0032] like Figure 1 As shown, the end of the air duct 5 located outside the air cooling box 4 is tilted, and the angle between the inclined section of the duct opening and the vertical perpendicular direction is 0-45°.

[0033] Therefore, the ports of the air duct 5 are arranged to be distributed obliquely, so that the air flow can flow more smoothly in the air duct 5 .

[0034] like Figure 1As shown, the phase change heat storage body 3 is a thin shell sealed container, and the phase change temperature range of the phase change material therein is 0°C to -15°C.

[0035] Among them, the phase change material can be composed of one or more combinations. The main purpose is to store the cold energy in the air-cooled control unit through the phase change process, and then release the cold energy when the roadbed 9 needs to be cooled. By balancing and regulating the temperature in the roadbed 9, the purpose of uniformly reducing the temperature of the roadbed 9 can be achieved.

[0036] like Figure 3-4 As shown, it also includes a water-proof geotextile 7 and a thermal insulation material 8. The thermal insulation material 8 is arranged above the air-cooling control unit, and the water-proof geotextile 7 is arranged above the thermal insulation material 8.

[0037] The above-mentioned thermal insulation material 8 can be one or a combination of polystyrene board (EPS), polyurethane board (PU), injection molded polystyrene board (XPS), with a thickness of 10~50cm. It is set at a height of 0~1.0m above the air-cooled control unit, which can effectively block the heat transfer process in the roadbed 9 from the outside, and has the effect of eliminating the adverse effect of heat absorption of the roadbed 9 on the cooling of engineering measures; in actual application, its width is slightly narrower than the width of the roadbed fill at its burial depth, and its burial height is coordinated with the burial height of the air-cooled control layer unit.

[0038] The above-mentioned water-proof geotextile 7 is a commonly used water-proof geotextile 7 in engineering projects, which is located on the upper part of the thermal insulation material 8. It is mainly used to reinforce the soil and isolate the water body to prevent moisture from entering the thermal insulation material 8 and the air-cooling control unit and affecting the air-cooling control performance.

[0039] The utility model is a forced refrigeration mode under forced convection conditions, and the specific working principle is as follows:

[0040] In the cold season, when the control module 12 determines that the received external environment temperature is lower than the predetermined negative temperature or the temperature measured by the internal temperature probe 2, the automatic temperature control damper 1 is opened to start the forced cooling mode. That is, the external cold air enters the air cooling control unit through the automatic temperature control damper 1, and then flows through the overall air cooling control unit. The low-temperature air and all the shells of the air cooling control unit mainly cool down the bottom plate, that is, the lower part of the roadbed 9; at the same time, it also exchanges heat and cools down with the phase change heat storage body 3, accumulates cold energy, and realizes the cooling process of the external open system of the roadbed 9 in the cold season.

[0041] In the warm season, when the control module 12 determines that the received ambient temperature is greater than the predetermined negative temperature or the temperature measured by the internal temperature probe 2, the automatic temperature control damper 1 is automatically closed, and the outside air no longer enters the air cooling control unit. The cold energy stored in the phase change heat storage body 3 is used to cool the roadbed 9.

[0042] The function of the phase change heat storage body 3 is to store cold energy in winter nights or other low ambient temperature weather conditions for heat exchange during the day or other relatively high ambient temperature conditions; in warm seasons, the cold energy stored in the phase change heat storage body 3 is used for heat exchange inside the roadbed 9. When the inside of the roadbed 9 is in a low temperature state, the entire system is in a dormant state.

[0043] In summary, through the external air cooling control system of the utility model, through the comprehensive utilization of automatic temperature control perception, forced convection, phase change energy storage slow release heat absorption and other modes, through the effective operation of the air cooling control unit, the purpose of efficient, intelligent cooling and long-term stability of the frozen soil roadbed 9 is achieved.

Claims

1. A self-controlled cold storage gas frozen soil roadbed, characterized in that: It includes air cooling control unit, control unit, power supply unit, automatic temperature control damper and internal temperature probe; The power supply unit includes a solar photovoltaic panel located above the roadbed slope; the power supply unit is connected to the control unit; The air-cooling control unit includes a phase-change heat storage body, an air-cooling box and an air duct. A plurality of phase-change heat storage bodies are evenly spaced inside the air-cooling box, and a plurality of air ducts connected to the external environment are arranged on the outer side wall of the air-cooling box. An internal temperature probe is arranged inside the air-cooling box, and an external temperature probe for measuring the external ambient temperature is arranged outside the air-cooling box. An automatic temperature control damper is installed at one end of each air duct located outside the air-cooling box, and the automatic temperature control damper, the internal temperature probe and the external temperature probe are all connected to the control unit.

2. The self-controlled cold storage gas frozen soil roadbed according to claim 1 is characterized in that: The air-cooling box body is a hollow structure consisting of a top plate, a bottom plate and an outer partition plate, and supporting columns are arranged at intervals inside the air-cooling box body.

3. The self-controlled cold storage gas frozen soil roadbed according to claim 1 or 2, characterized in that: The end of the air duct located on the outside of the air cooling box is tilted, and the angle between the inclined section of the duct opening and the vertical perpendicular direction is 0~45°.

4. The self-controlled cold storage gas frozen soil roadbed according to claim 1 or 2, characterized in that: The phase change heat storage body is a thin-shell sealed container, and the phase change temperature range of the phase change material inside it is 0°C~-15°C.

5. The self-controlled cold storage gas frozen soil roadbed according to claim 3 is characterized in that: The phase change heat storage body is a thin-shell sealed container, and the phase change temperature range of the phase change material inside it is 0°C~-15°C.

6. The self-controlled cold storage gas frozen soil roadbed according to claim 1, 2 or 5, characterized in that: The control unit includes a control module and a signal transmission module, and the control module is connected to the signal transmission module; or / and, the power supply unit also includes a battery, the solar photovoltaic panel is connected to the battery, and the battery is connected to the control unit.

7. The self-controlled cold storage gas frozen soil roadbed according to claim 3 is characterized in that: The control unit includes a control module and a signal transmission module, and the control module is connected to the signal transmission module; or / and, the power supply unit also includes a battery, the solar photovoltaic panel is connected to the battery, and the battery is connected to the control unit.

8. The self-controlled cold storage gas frozen soil roadbed according to claim 4 is characterized in that: The control unit includes a control module and a signal transmission module, and the control module is connected to the signal transmission module; or / and, the power supply unit also includes a battery, the solar photovoltaic panel is connected to the battery, and the battery is connected to the control unit.

9. The self-controlled cold storage gas frozen soil roadbed according to claim 1, 2, 5, 7 or 8, characterized in that: It also includes water-proof geotextile and thermal insulation material. The thermal insulation material is arranged above the air-cooling control unit, and the water-proof geotextile is arranged above the thermal insulation material.

10. The self-controlled cold storage gas frozen soil roadbed according to claim 6, characterized in that: It also includes water-proof geotextile and thermal insulation material. The thermal insulation material is arranged above the air-cooling control unit, and the water-proof geotextile is arranged above the thermal insulation material.

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