CN115467206A - Anti-frost-heaving roadbed system and roadbed heat supply method - Google Patents

Abstract

The invention provides an anti-frost heaving roadbed system and a roadbed heat supply method, and relates to the technical field of railway roadbed maintenance equipment. The frost heaving resistant roadbed system comprises a roadbed body, a heat dissipation device and a geothermal energy device, wherein the heat dissipation device is embedded in the roadbed body, and the geothermal energy device is arranged underground at the position of the roadbed body and is used for collecting geothermal energy; a circulating pipeline is arranged between the heat dissipation device and the geothermal energy device, a heat medium is arranged in the circulating pipeline, and the circulating pipeline is used for transferring the heat collected by the geothermal energy device to the heat dissipation device. Based on the technical scheme of the invention, when the ambient temperature of the railway roadbed is too low, the geothermal energy device collects the geothermal energy and radiates the heat to the roadbed body through the radiating device to heat the roadbed base body, so that the temperature of the railway roadbed is raised, and frost heaving is avoided.

Description

Anti-frost-heaving roadbed system and roadbed heat supply method

Technical Field

The invention relates to the technical field of railway roadbed maintenance equipment, in particular to an anti-frost heaving roadbed system and a roadbed heat supply method.

Background

In cold and severe cold climatic regions, the frost heaving of the roadbed can cause the irregularity of the railway track structure, thereby not only increasing the consumption of manpower and material resources of the engineering department, but also influencing the safe operation of the line. Therefore, in order to avoid the occurrence of frost heaving of the roadbed as much as possible, a targeted frost heaving prevention and control measure must be taken. The temperature of the roadbed filling is reduced to be below the freezing point temperature to cause liquid water in soil to become ice, and the volume of the water with the same mass can expand by 9 percent after the water becomes ice, so the temperature is a key cause for the frost heaving of the roadbed.

At present, the adjusting method aiming at the roadbed temperature comprises the steps of increasing the thermal resistance of roadbed filling materials, paving an insulating layer on the top surface of the roadbed and additionally arranging insulating protective roads on side slopes on two sides of the roadbed. CN210596837U discloses a distributing type solar energy plateau railway frozen soil ground consolidates, and increase filler thermal resistance and heat preservation measure can only weaken road bed rate of heat dissipation and reduce the freezing degree of depth to a certain extent, reduce the frost heaving deflection from this. However, in severe cold climatic regions, the lowest temperature can reach below-30 ℃, and in extreme severe cold and extremely cold weather, even if the measures are adopted, the freezing depth can be gradually increased to be above the harmful freezing depth critical value, and then serious frost heaving diseases are caused. Particularly for high-speed railway ballastless tracks, when frost heaving deformation exceeds the adjustable range of a track fastener and cannot be adjusted through the fastener, the speed of a train must be limited or the train must be shut down, otherwise the train can fall off or overturn.

Aiming at the negative temperature phenomenon and frost heaving diseases of the roadbed, if the temperature of the roadbed can be kept above the freezing point temperature in extremely cold weather, the frost heaving diseases can be fundamentally eliminated, and the method has great significance for normal operation and daily work maintenance operation of the railway.

Disclosure of Invention

In order to solve the problems in the prior art, the application provides an anti-frost-heaving roadbed system and a roadbed heat supply method, so that the frost-heaving problem of a railway roadbed is solved.

In one aspect, the present invention provides an anti-frost heaving roadbed system, including:

a roadbed body;

the heat dissipation device is embedded in the road basic body; and

the geothermal energy device is arranged underground at the position of the roadbed body and is used for collecting geothermal energy;

and a circulating pipeline is arranged between the heat dissipation device and the geothermal energy device, a heat medium is arranged in the circulating pipeline, and the circulating pipeline is used for transferring the heat collected by the geothermal energy device to the heat dissipation device.

As a further improvement of the technical scheme:

in the frost heaving resistant roadbed system, the geothermal energy device further comprises a geothermal sleeve, a heat absorption pipe arranged in the geothermal sleeve and used as a part of the circulating pipeline, and a heat conduction material filled between the geothermal sleeve and the heat absorption pipe.

The frost heaving resistant roadbed system further comprises a heat dissipation sleeve, a heat dissipation pipe arranged in the heat dissipation sleeve and used as a part of the circulating pipeline, and a heat conduction material filled between the heat dissipation sleeve and the heat dissipation pipe.

The frost heaving resistant roadbed system further comprises a conversion device, wherein the conversion device comprises a compressor, the compressor is arranged on the circulating pipeline, an inlet of the compressor is communicated with an outlet of the circulating pipeline of the geothermal energy device part, and an outlet of the compressor is communicated with an inlet of the circulating pipeline of the heat dissipation device part.

The anti-frost heaving roadbed system further comprises an electric heating film, wherein the electric heating film is attached to the outside of the compressor and used for heating lubricating oil of the compressor.

The frost heaving resisting roadbed system further comprises a solar device, wherein the solar device is connected with the conversion device through a cable so as to supply power to electric components in the conversion device.

Foretell frost heaving resistance roadbed system, furtherly, circulation pipeline includes flexible metal pipeline section, flexible metal pipeline section set up in conversion device's compressor the heat absorption pipe of geothermal energy device and between two liang among heat abstractor's the cooling tube three, just the outside cladding of flexible metal heat transmission pipeline section has the heat preservation.

Foretell frost heaving resistance roadbed system, furtherly, the roadbed body includes by lower supreme ground, roadbed body, foundation bed bottom, foundation bed top layer and the foam lightweight concrete heat preservation that stacks gradually, heat abstractor set up in the foundation bed bottom layer.

In another aspect, the present invention provides a roadbed heating method, including the steps of:

counting historical environmental data of a roadbed and acquiring real-time environmental data of the roadbed;

selecting a frost heaving resisting roadbed system according to the historical environmental data and determining an installation mode;

and controlling the operation mode of the frost heaving resisting roadbed system according to the real-time environment data of the roadbed.

In the roadbed heating method, further, when the temperature is lower than a first temperature threshold value, the anti-frost heaving roadbed system is controlled to adopt a timing intermittent operation mode; and when the temperature is lower than a second temperature threshold value or harmful frost heaving occurs to the roadbed, controlling the frost heaving resisting roadbed system to adopt a continuous operation mode.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

Compared with the prior art, the anti-frost heaving roadbed system and the roadbed heat supply method provided by the invention at least have the following beneficial effects: in the frost heaving resistant roadbed system, when the environment temperature of the railway roadbed is too low, the geothermal energy device collects geothermal energy and radiates heat to the roadbed body through the heat radiation device to heat the roadbed base body, so that the temperature of the railway roadbed rises, and frost heaving is avoided.

In order to make the aforementioned objects, features and advantages of the present invention more comprehensible and comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

fig. 1 is a schematic structural diagram illustrating an anti-frost heaving roadbed system provided by the embodiment of the invention;

FIG. 2 is a schematic structural diagram of a transformation device of the anti-frost heaving roadbed system according to the embodiment of the invention;

fig. 3 is a schematic structural diagram of a geothermal energy device of an anti-frost heaving roadbed system provided by the embodiment of the invention;

fig. 4 shows a schematic structural diagram of a heat dissipation device of an anti-frost heaving roadbed system according to an embodiment of the invention.

In the drawings, like parts are given like reference numerals. The drawings are not to scale.

Reference numerals are as follows:

100-frost heaving resistant roadbed system, 110-roadbed body, 111-foundation, 112-roadbed body, 113-roadbed bottom layer, 114-roadbed surface layer, 115-foam lightweight concrete heat preservation layer, 120-heat dissipation device, 121-heat dissipation casing pipe, 122-heat dissipation pipe, 123-throttle valve, 124-second support, 130-solar device, 132-photovoltaic panel, 133-storage battery, 134-inversion controller, 140-geothermal energy device, 141-geothermal casing pipe, 142-heat absorption pipe, 143-first support, 150-conversion device, 151-heat preservation shell, 152-compressor, 153-electric heating film, 154-controller, 155-flexible metal heat transmission pipe.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

The invention will be further explained with reference to the drawings.

The embodiment of the invention provides an anti-frost heaving roadbed system 100, which aims to solve the frost heaving problem of a railway roadbed.

As shown in fig. 1 to fig. 4, an anti-frost-heaving roadbed system 100 according to an embodiment of the present invention includes a roadbed body 110, a solar energy device 130 and a geothermal energy device 140, wherein a heat dissipation device 120 is disposed in a roadbed bottom layer 113 of the roadbed body 110; the solar device 130 is used for converting solar energy into electric energy and storing the electric energy; the geothermal energy device 140 is connected to the heat dissipation device 120, and is connected to the solar energy device 130 through the conversion device 150, and the solar energy device 130 is used for supplying power to the conversion device 150, so that the geothermal energy device 140 collects geothermal energy and dissipates the heat to the roadbed body 110 through the heat dissipation device 120.

In the frost heaving resisting roadbed system 100, the solar device 130 converts solar energy into electric energy and stores the electric energy, when the environmental temperature of the railway roadbed is too low, the solar device 130 supplies power to the conversion device 150 so that the geothermal energy device 140 collects geothermal energy and radiates the heat to the roadbed body 110 through the heat radiation device 120, and the roadbed base body 110 is heated so that the temperature of the railway roadbed is raised and frost heaving is avoided.

Specifically, referring to fig. 2, the transformation device 150 includes a heat preservation housing 151 and a compressor 152 located in the heat preservation housing 151, an electric heating film 153 is sleeved outside the compressor 152, the compressor 152 and the electric heating film 153 are both connected to the solar device 130 through a controller 154, and the compressor 152, the geothermal energy device 140 and the heat dissipation device 120 form a heat medium circulation path.

Referring to fig. 3, the geothermal energy device 140 includes a geothermal casing 141, a heat absorbing pipe 142 disposed in the geothermal casing 141, and a heat conductive material disposed between the geothermal casing 141 and the heat absorbing pipe 142, a compressor 152 is communicated with one end of the heat absorbing pipe 142 for absorbing geothermal energy in the heat absorbing pipe 142 and transmitting the geothermal energy to the heat dissipating device 120 for dissipating heat, and the heat absorbing pipe 142 is mounted in the geothermal casing 141 through a first bracket 143.

Referring to fig. 4, the heat dissipating device 120 includes a heat dissipating sleeve 121, a heat dissipating tube 122 disposed in the heat dissipating sleeve 121, and a heat conductive material disposed between the heat dissipating sleeve 121 and the heat dissipating tube 122, the compressor 152 is communicated with one end of the heat dissipating tube 122, the other end of the heat dissipating tube 122 is communicated with the other end of the heat absorbing tube 142 through the throttle 123, and the heat dissipating tube 122 is spiral, so as to increase the heat dissipating area of the heat dissipating tube 122, thereby improving the heat dissipating efficiency of the heat dissipating tube 122. The heat dissipation pipe 122 is installed in the heat dissipation sleeve 121 through the second bracket 124, and heat conduction layers are sleeved on the outer sides of the geothermal sleeve 141 and the heat dissipation sleeve 121.

The compressor 152 is the core driving component of the inverter 150, but since the lubricating oil inside the compressor 152 is solidified at-30 ℃ and the compressor 152 cannot be normally started, it is very important to ensure the normal start and operation of the compressor 152 in severe cold weather.

In the invention, the electric heating film 153 is attached to the outside of the compressor 152, and when the compressor 152 cannot be started due to low temperature in severe cold weather, the compressor 152 is preheated by the electric heating film 153 to reach the temperature required by normal starting and then is started to operate. Specifically, the solar device 130 is connected to the controller 154 of the conversion device 150 via a power line. The controller 154 is divided into two output terminals, which are respectively connected to the compressor 152 and the electric heating film 153. The two output ends work in an alternate power supply mode, and when the electric heating film 153 senses that the temperature of the compressor 152 is lower than-30 ℃, the controller 154 only supplies power to the electric heating film 153 to dissipate heat; when the temperature of the compressor 152 sensed by the electric heating film 153 rises to-30 ℃, the controller 154 stops supplying power to the electric heating film 153 and instead supplies power to the compressor 152. Therefore, the compressor 152 can be normally started in extreme cold weather and the whole system can normally run through the combined application of solar energy and geothermal energy.

The compressor 152, the heat absorbing pipe 142 and the heat radiating pipe 122 are sequentially communicated with the flexible metal heat transferring pipe 155, and the outer side of the flexible metal heat transferring pipe 155 is coated with a heat insulating layer which insulates the flexible metal heat transferring pipe 155. The compressor 152 of the reforming device 150 forms a low pressure environment inside the heat absorbing pipe 142 of the geothermal energy device 140 and a high pressure environment inside the heat radiating pipe 122 of the heat radiating device 120, respectively, by performing work. The heat medium is a gas-liquid two-phase flow when entering the heat absorbing pipe 142, and is gasified in a low-pressure environment inside the heat absorbing pipe 142, the gasification process is accompanied with a heat absorption effect, the temperature of the wall surface of the heat absorbing pipe 142 is reduced, then the temperature of the heat conducting material and the temperature of the geothermal sleeve 141 are gradually reduced, when the temperature of the outer wall of the geothermal sleeve 141 is lower than that of the surrounding foundation 111 soil, the heat of the foundation 111 soil is quickly transferred to the inside of the geothermal sleeve 141 through the heat conducting layer, so that the deep geothermal energy of the foundation 111 is collected, the gaseous heat medium containing the geothermal energy then enters the compressor 152, under the work compression of the compressor 152, the heat storage density of the gaseous heat medium is increased, the gaseous heat medium is changed into high-temperature high-pressure gas, the high-temperature high-pressure gaseous heat medium then enters the heat radiating pipe 122, due to the surrounding of the low-temperature roadbed, the high-temperature high-pressure gaseous heat medium can radiate heat outwards to heat the roadbed, the high-temperature liquid state is finally cooled into high-pressure liquid state, the high-pressure liquid state then passes through the throttle valve 123, the liquid state is throttled and reduced in the throttle valve 123, the two-phase flow, and is changed into the gas-liquid heat absorbing pipe 142 again, and is collected and is repeatedly conducted to the heat radiation and is repeatedly.

When high-temperature and high-pressure liquid heating medium flows in the heat dissipation pipe 122 of the heat dissipation device 120, heat is gradually transferred to the heat conduction material, then the temperature of the pipe wall of the heat dissipation sleeve 121 rises, and under the driving action of temperature difference, the heat of the heat dissipation sleeve 121 continues to be transferred to the soil around the heat conduction layer through the heat conduction layer, so that the temperature of the roadbed soil is gradually raised, and thus the frost heaving is prevented from being generated.

The solar device 130 includes a photovoltaic panel 132 mounted by a photovoltaic bracket and a battery 133 connected to the photovoltaic panel 132, the battery 133 being connected to the inverter device 150 by an inverter controller 134. During the daytime when the sun is shining, the sunlight shines on the photovoltaic panel 132 to generate a dc voltage, and the dc power is stored in the battery 133. The photovoltaic panel 132 uses a thin film solar cell, and can maintain a good weak photovoltaic effect even in rainy and snowy weather without solar irradiation. When power is needed, the inverter controller 134 can convert the low-voltage constant-frequency direct current stored in the storage battery 133 into a usable frequency-modulation voltage-regulation power supply at any time no matter in daytime or at night.

The roadbed body 110 comprises a foundation 111, a roadbed body 112, a foundation bed bottom layer 113, a foundation bed surface layer 114 and a foam lightweight concrete heat-insulating layer 115 which are sequentially arranged in a stacked manner from bottom to top. The foam lightweight concrete heat-insulating layer 115 is actually a cold-blocking and heat-insulating boundary, on one hand, the heat inside the roadbed is prevented from being dissipated too fast under the condition of cold climate; on the other hand, the heat transferred to the roadbed body 110 by the heat dissipation device 120 is prevented from being dissipated to the surrounding atmosphere, which is beneficial to maintaining the roadbed temperature.

The invention also provides a roadbed heating method, which comprises the following steps:

step 1: and counting historical environmental data of the roadbed and acquiring real-time environmental data of the roadbed.

And investigating the freezing damage condition of the roadbed, including the lowest winter air temperature, the average winter air temperature, the maximum freezing depth, the maximum frost heaving amount of the roadbed, the freezing depth difference value of the road shoulder and the center of the roadbed and the like.

Collecting roadbed filling soil samples within the roadbed freezing depth range, determining frost heaving stratum thermophysical parameters through indoor tests according to the climatic conditions of the region where the roadbed is located, and calculating the hourly heat load and the maximum instantaneous heat load of each linear meter of the roadbed in winter.

The calculation method of the heat load comprises the following steps: firstly, combining the hourly air temperature and the comprehensive earth surface heat exchange coefficient, and calculating the air convection heat exchange quantity on the surface of the roadbed by taking the earth surface target control temperature of 0 ℃ as a calculation reference; secondly, calculating the radiation heat gain of the roadbed surface by combining the solar radiation heat conversion coefficient; thirdly, multiplying the sum of the air convection heat exchange quantity and the radiation heat gain quantity by a heat load coefficient, calculating a time-by-time heat load time course curve, and determining the maximum instantaneous heat load.

The purpose of the thermal load factor is: when the artificial active heat regulation and control are carried out on the frozen soil roadbed, a certain safety coefficient needs to be reserved for the heat regulation and control effect according to the grade of a railway, so that the regulation and control target value of the total heat transfer quantity of the roadbed needs to be corrected and then can be used as the final calculation result of the heat load.

Preferably, the thermal load coefficients of the high-speed railway, the passenger-cargo collinear railway and the freight railway are respectively 1.8, 1.6 and 1.4.

And 2, step: and selecting the frost heaving resisting roadbed system according to the historical environmental data and determining an installation mode.

According to the roadbed freezing depth and the change rule of the heat transfer radius of an internal artificial heat source along with time, the embedding depth of a heat dissipation sleeve of the heat dissipation device on the cross section of the roadbed body and the arrangement distance of the heat dissipation sleeve along the longitudinal section (roadbed trend) are determined. And (3) determining the heat supply capacity of the conversion device by combining the maximum instantaneous heat load per linear meter of the roadbed obtained in the step (2).

The calculation method of the heat supply capacity of the conversion device is that the maximum instantaneous heat load of each linear meter of the roadbed is multiplied by the arrangement distance along the vertical section (the trend of the roadbed).

And (5) investigating the solar energy and geothermal energy resource conditions near the roadbed. Determining the sunshine time, the solar irradiation intensity and the irradiation quantity of an area where a roadbed is located, and the field terrain condition and the shielding condition; and determining the ground temperature gradient and the underground heat storage condition of the foundation near the roadbed through a field thermal response test.

And selecting the type of the components of the conversion device. Selecting the type of the compressor according to the designed heat supply capacity of the conversion device; selecting the type of a heating medium according to the ground temperature gradient condition of a foundation near a roadbed; the type of the electric heating film is selected according to the local lowest air temperature, and then other components are matched according to the model and the size of the compressor.

And selecting the type of the components of the solar device. According to the power consumption of the compressor and the electrothermal film, the model of the photovoltaic panel of the solar device is determined by combining the solar resource condition of the region where the roadbed is located, and then other components are matched.

And determining the arrangement position of the geothermal energy device and the type selection of parts of the geothermal energy device. According to the underground heat storage condition, the arrangement position and the number of the foundation drill holes are determined, the height and the diameter of the geothermal sleeve are determined, then the length of a copper pipe of the U-shaped heat absorption pipe is determined by combining the type of the compressor, and the type of the multi-joint is determined according to the number of the geothermal sleeves.

And determining the layout position of the heat dissipation device and the part type selection thereof. According to the design size of the roadbed, the maximum freezing depth and the freezing depth difference value between the roadbed shoulder and the roadbed center, the entrance position, the inclination angle and the number of roadbed drill holes of the heat dissipation device are determined, and the length, the diameter and the pipe thickness of the heat dissipation sleeve are determined. Then, the length of the copper pipe of the spiral radiating pipe is determined according to the type of the compressor. And determining the type of the multi-joint according to the number of the heat dissipation sleeves.

And determining the number and the length of the flexible metal heat transfer pipes required by the connection of each part according to the positions of the geothermal energy device, the conversion device and the heat dissipation device.

And step 3: and controlling the operation mode of the frost heaving resisting roadbed system according to the real-time environment data of the roadbed.

When the temperature is lower than a first temperature threshold value, controlling the frost heaving resisting roadbed system to adopt a timing intermittent operation mode; and when the temperature is lower than a second temperature threshold value or harmful frost heaving occurs to the roadbed, controlling the frost heaving resisting roadbed system to adopt a continuous operation mode.

In this embodiment, the start-up timing and the operation time of the conversion means are determined based on the prediction of extremely cold weather.

1) From the prevention perspective, after entering winter, the operation mode of the conversion device is controlled through the inverter controller, the timing intermittent operation mode is adopted, 3h is taken as a start-stop cycle period, and 0.5h is taken as unit duration. The operation mode is as follows:

when the average heat load of a certain day is 0% -20% of the maximum heat load, the start-stop time proportion is set to be 0.5h:2.5h;

when the average heat load of a certain day is 20% -40% of the maximum heat load, the starting-stopping time proportion is set to be 1.0h:2.0h;

when the average heat load of a certain day is 40% -60% of the maximum heat load, the start-stop time proportion is set to be 1.5h:1.5h;

when the average heat load of a certain day is 60% -80% of the maximum heat load, the start-stop time proportion is set to be 2.0h:1.0h;

when the average heat load of a certain day is 80% -100% of the maximum heat load, the start-stop time proportion is set to be 2.5h:0.5h.

2) When the weather forecast is coming from extremely low temperature weather, the continuous operation mode is set.

3) When harmful frost heaving occurs on the upper part of the roadbed, a continuous operation mode is set.

For example, the active heating frost heaving resistant railroad bed body of the design and implementation ground is as follows:

the engineering conditions of the roadbed body are as follows: the thickness of the bed surface layer 104 of the freight railway is 60cm, and the thickness of the bed bottom layer 103 of the freight railway is 190cm. The freezing damage conditions are as follows: the freezing damage section is 8m long, the maximum freezing depth is 180cm, the maximum cooling load is 200W/m, and the corresponding cooling load correction coefficient is 1.4.

The design and implementation of the conversion device are as follows: a compressor (200W/m 8.0m 1.4= 2.24kW) with the heating capacity of 3.0kW is selected, the power consumption rate is 600W, the heat medium is low-temperature refrigerant R134a, and the lowest refrigerating temperature is less than-20 ℃. The conversion device is arranged at the center of the freezing injury section 1.0m away from the slope toe of the roadbed. Correspondingly, a set of solar device capable of meeting the power consumption of 600W is matched.

The design and implementation conditions of the geothermal energy device are as follows: the general mechanized drilling machine drills downwards vertical foundation drill holes on the surface of a foundation which is 6m away from a slope toe of the roadbed, the number of the foundation drill holes is 2, the distance between every two adjacent foundation drill holes along the moving direction of the foundation is 4.0m, and the outer sides of the drill holes are 2.0m respectively. The bore 501 has a diameter of 180mm and a height of 8.0m. The specific dimensions of the geothermal casing are: the diameter is 140mm, the overall height is 8.0m, and the wall thickness of the pipe is 2.0mm. After the foundation drilling construction is completed, inserting the prefabricated geothermal casing, immediately injecting high-heat-conduction quick-drying mortar into the residual gap in the drill hole, and forming a heat conduction layer with the thickness of 20mm after solidification. The inside of the geothermal casing is inserted into a U-shaped heat absorption pipe and fixed by a first bracket with the diameter of 140 mm. The specific size of the U-shaped heat absorption tube is as follows: the device is formed by spirally bending a copper pipe with the accumulated length of 150m and the diameter of 10mm, and the overall diameter is 100mm and the length is 6.0m. After the U-shaped heat absorption pipe is inserted, high-heat-conductivity heat storage particle materials are poured into the geothermal sleeve. Then, the inlets of the two U-shaped heat absorption pipes are connected into 1 inlet by a multi-joint, the outlets of the two U-shaped heat absorption pipes are connected into 1 outlet by the multi-joint, and finally, flanges are installed at the outer ends of the geothermal casing pipes.

The design and implementation conditions of the heat dissipation device are as follows: the general mechanized drilling machine drills roadbed drill holes which incline downwards at the position of a 120cm slope below the top surface of the roadbed, the number of the roadbed drill holes is 2, the distance between every two roadbed drill holes along the moving direction of the roadbed is 4.0m, and the outer sides of the drill holes are 2.0m respectively, so that the heat supply effect can completely cover the whole frost heaving paragraph. The bore had a diameter of 100mm and a length of 4.0m. The specific dimensions of the heat dissipation sleeve are as follows: the diameter was 80mm, the overall length was 4.0m, and the wall thickness was 2.0mm. After the roadbed drilling construction is completed, the prefabricated heat dissipation sleeve is inserted, high-heat-conduction quick-drying mortar is injected into a gap left in a drill hole immediately, and a heat conduction layer with the thickness of 10mm is formed after solidification. The spiral radiating pipe is inserted into the radiating sleeve and is fixed by a second bracket with the diameter of 80 mm. The specific dimensions of the spiral radiating pipe are as follows: the spiral winding device is formed by spirally winding a copper pipe with the accumulated length of 130m and the diameter of 6mm, and the whole diameter of the spiral winding device is 50mm and the length of the spiral winding device is 4.0m. After the spiral radiating pipe is inserted, the heat accumulating granular material with high heat conductivity is poured into the radiating sleeve. And then, connecting the inlets of the two spiral radiating pipes into 1 inlet by using a multi-connection structure, connecting the outlets of the two spiral radiating pipes into 1 outlet by using a multi-connection joint, welding a throttle valve at the outlet, and finally installing a flange at the outer end of the radiating sleeve.

After the conversion device, the geothermal energy device and the heat dissipation device are designed and implemented, the flexible metal heat transfer pipe is adopted, and the outlet of the U-shaped heat absorption pipe and the inlet of the compressor, the outlet of the compressor and the inlet of the spiral heat dissipation pipe, the outlet of the spiral heat dissipation pipe and the inlet of the throttle valve, and the outlet of the throttle valve and the inlet of the U-shaped heat absorption pipe are welded and sealed in sequence to form a closed circulation loop. And finally, filling a heat medium into the compressor, performing joint debugging and joint testing of all the devices, and completing field installation operation.

After entering winter, the operation mode of the heat energy conversion and transportation subsystem 4 is flexibly adjusted through the inverter controller 204 according to the preset scheme of the step 10 in the refined heat supply method.

In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims (10)

1. An anti-frost heaving roadbed system, the anti-frost heaving roadbed system comprising:

a roadbed body;

the heat dissipation device is embedded in the road basic body; and

the geothermal energy device is arranged underground at the position of the roadbed body and is used for collecting geothermal energy;

the geothermal energy device comprises a heat dissipation device, a geothermal energy device and a circulating pipeline, wherein the circulating pipeline is arranged between the heat dissipation device and the geothermal energy device, a heat medium is arranged in the circulating pipeline, and the circulating pipeline is used for transferring heat collected by the geothermal energy device to the heat dissipation device.

2. The frost heaving resisting roadbed system of claim 1, wherein the geothermal energy device comprises a geothermal casing, an absorber pipe arranged in the geothermal casing and used as a part of the circulation pipeline, and a heat conducting material filled between the geothermal casing and the absorber pipe.

3. The frost heaving resistant roadbed system as claimed in claim 1, wherein the heat dissipation means comprises a heat dissipation sleeve, a heat dissipation pipe disposed in the heat dissipation sleeve and serving as a part of the circulation pipeline, and a heat conductive material filled between the heat dissipation sleeve and the heat dissipation pipe.

4. The frost heaving resistant roadbed system according to any one of claims 1 to 3, further comprising a conversion device, wherein the conversion device comprises a compressor, the compressor is arranged on the circulation pipeline, an inlet of the compressor is communicated with an outlet of the circulation pipeline of the geothermal energy device part, and an outlet of the compressor is communicated with an inlet of the circulation pipeline of the heat dissipation device part.

5. The frost heave resistant roadbed system according to claim 4, wherein the conversion device further comprises an electric heating film, the electric heating film is attached outside the compressor and is used for heating lubricating oil of the compressor.

6. The frost heaving resistant roadbed system of claim 5, further comprising a solar energy device connected to the conversion device by a cable to supply power to electrical components in the conversion device.

7. The frost heaving resisting roadbed system as claimed in claim 6, wherein the circulation pipeline comprises a flexible metal pipe section, the flexible metal pipe section is arranged between the compressor of the conversion device, the heat absorption pipe of the geothermal energy device and the heat dissipation pipe of the heat dissipation device, and the outer side of the flexible metal heat transmission pipe section is wrapped with an insulating layer.

8. The frost heaving resisting roadbed system of claim 1, wherein the roadbed body comprises a foundation, a roadbed body, a roadbed bottom layer, a roadbed surface layer and a foam lightweight concrete heat insulation layer which are sequentially arranged in a stacked manner from bottom to top, and the heat dissipation device is arranged in the roadbed bottom layer.

9. A roadbed heating method is characterized by comprising the following steps:

counting historical environmental data of a roadbed and acquiring real-time environmental data of the roadbed;

selecting a frost heaving resisting roadbed system according to the historical environmental data and determining an installation mode;

and controlling the operation mode of the frost heaving resisting roadbed system according to the real-time environment data of the roadbed.

10. The roadbed heating method of claim 9, wherein when the temperature is lower than a first temperature threshold value, the frost heaving resisting roadbed system is controlled to adopt a timing intermittent operation mode; and when the temperature is lower than a second temperature threshold value or harmful frost heaving occurs to the roadbed, controlling the frost heaving resisting roadbed system to adopt a continuous operation mode.

Images