CN220335609U - Freeze soil area prevents thawing and sinks compound roadbed structure - Google Patents
Freeze soil area prevents thawing and sinks compound roadbed structure Download PDFInfo
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- CN220335609U CN220335609U CN202320282313.5U CN202320282313U CN220335609U CN 220335609 U CN220335609 U CN 220335609U CN 202320282313 U CN202320282313 U CN 202320282313U CN 220335609 U CN220335609 U CN 220335609U
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- 239000002689 soil Substances 0.000 title claims abstract description 47
- 238000010257 thawing Methods 0.000 title claims abstract description 19
- 150000001875 compounds Chemical class 0.000 title description 2
- 239000002131 composite material Substances 0.000 claims abstract description 15
- 230000017525 heat dissipation Effects 0.000 claims abstract description 13
- 238000010521 absorption reaction Methods 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims abstract description 7
- 238000009423 ventilation Methods 0.000 claims description 30
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 13
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 238000005086 pumping Methods 0.000 claims description 4
- 239000011150 reinforced concrete Substances 0.000 claims description 3
- 230000035515 penetration Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 14
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000005057 refrigeration Methods 0.000 abstract description 3
- 239000000758 substrate Substances 0.000 abstract description 3
- 230000009471 action Effects 0.000 abstract description 2
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 201000010099 disease Diseases 0.000 description 3
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 3
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- 239000000463 material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008542 thermal sensitivity Effects 0.000 description 1
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- Road Paving Structures (AREA)
Abstract
The utility model belongs to the technical field of roadbed structures in frozen soil areas, and particularly relates to an anti-thawing composite roadbed structure in frozen soil areas, which comprises a main pipe, wherein one end of the main pipe is buried in a foundation and is connected with a heat absorption evaporation section in the foundation, the heat absorption evaporation section is composed of two longitudinal side pipes and one transverse side pipe, the longitudinal side pipes and the transverse side pipes are fixedly connected to the same end of the main pipe, the longitudinal side pipes and the transverse side pipes are communicated with the inner cavity of the main pipe, a plurality of fins are uniformly and flexibly arranged at one end of the main pipe exposed out of the foundation, the fins are of hollow structures, cavities of the fins are communicated with the cavities of the main pipe, a plurality of heat conducting rods are distributed along two sides of the frozen soil roadbed, the heat conducting rods are fixedly arranged on the foundation, and two layers of geogrids are paved in the roadbed along the height direction of the roadbed. The device has a large refrigeration and cooling action range, can effectively absorb the redundant heat of roadbed substrates and the underlying frozen soil foundations on the extending sides of the slope feet on the two sides, maintains the stability of the frozen soil for many years, and has good heat dissipation effect.
Description
Technical Field
The utility model belongs to the technical field of roadbed structures in frozen soil areas, and particularly relates to an anti-thawing and anti-sinking composite roadbed structure in a frozen soil area.
Background
Permafrost is a special soil body, and has thawing, frost heaving and rheological properties due to ice-containing property and thermal sensitivity, so that the road engineering in the permafrost region is easy to generate diseases such as thermal thawing subsidence, slope collapse and the like, and the stability of roadbed and the driving safety are affected. Compared with the common soil body, the permafrost has higher strength in a frozen state, and in a melted state, the bearing capacity of the permafrost is reduced due to the melting of ice, and the higher the ice content in the permafrost, the smaller the bearing capacity after melting. Serious damage to the roadbed of a frozen soil area is caused by the instability of the permafrost roadbed. After the roadbed is built in the frozen soil area of the plateau for many years, the heat exchange condition and the hydrothermal transportation process between the ground and the air are changed, the heat balance condition between the climate and the natural permafrost is broken through by changing the surface heat exchange condition, the net heat absorption and the heat absorption are increased due to unbalanced year-by-year heat absorption and heat release in the roadbed, the temperature of the underlying soil body is increased, the permafrost is melted, and the stability of the frozen soil roadbed is seriously threatened.
In order to ensure the stability of the frozen soil roadbed, engineering personnel adopt a large number of measures, such as properly improving the filling height of the roadbed and preserving heat by natural soil, and the method is low in cost, but meanwhile, the high roadbed is easy to cause yin-yang breaking effect, so that the uneven deformation of the roadbed is aggravated; the insulation board can be buried in the roadbed, and a good engineering effect is achieved in engineering practice; the ventilation pipe can be buried, namely, a metal or concrete transverse ventilation pipe with a certain diameter is buried in the roadbed, so that the roadbed filling temperature can be effectively reduced; the stone-throwing roadbed can be adopted, namely, broken stones are used for filling the roadbed, and ventilation and air permeability of the stone-filling roadbed are utilized to isolate downward movement of hot air and absorb cold energy at the same time, so that the function of protecting frozen soil is achieved; a hot rod can be adopted, and the heat of the frozen soil layer can be continuously absorbed by utilizing the vapor-liquid change process of the liquid working medium; the low-frame drought bridges are built in a few extremely unstable frozen soil sections, the engineering effect is guaranteed, and the construction cost is high.
Although the existing engineering measures can obviously improve the stability of the frozen soil roadbed, the existing engineering measures have a small defect, such as small heat absorption range of the existing hot rod structure, and the existing engineering measures mainly absorb the heat of the frozen soil foundation under the slope foot of the roadbed, and cannot act on the frozen soil foundation under the middle part of the roadbed, and the heat accumulation in the foundation is easy to cause due to the fact that the building ground temperature of the roadbed is increased, the heat dissipation effect is poor, the stability of the frozen soil layer in the foundation is poor, and therefore the protection effect on the foundation is greatly reduced.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model aims to provide the composite roadbed structure for preventing thawing and sinking in a frozen soil area, which has a large refrigeration and cooling effect range, can effectively absorb redundant heat of roadbed substrates and the frozen soil foundations under the outer sides of the slope feet on two sides, maintains the stability of frozen soil for many years, has good heat dissipation effect and high operation efficiency, effectively limits the displacement of roadbed filling materials and improves the roadbed bearing capacity through the design of a double-layer geogrid structure, and can effectively reduce uneven settlement and longitudinal cracking of roadbeds.
The technical scheme of the utility model is as follows:
the composite roadbed structure for preventing thawing and sinking in the frozen soil area comprises a roadbed, wherein the roadbed is arranged on the upper side of a foundation and further comprises a plurality of heat dissipation components;
the heat dissipation assembly includes:
the heat absorption evaporation section is a plurality of guide pipes buried in the foundation;
one end of the main pipe is buried in the foundation and fixedly connected with the plurality of guide pipes, and the other end of the main pipe extends out of the foundation and is provided with a buried depth marking;
the fins are uniformly distributed at one end of the main pipe, which is far away from the guide pipe, and the fins are fixedly connected with the main pipe;
the main pipe, the guide pipe and the fins together form a vacuum-pumping cavity structure, and liquid ammonia is injected into the guide pipe.
Preferably, geogrid and ventilation pipe are still be provided with respectively in the road bed, geogrid follows the road bed direction of height lays two-layer in the road bed, geogrid pass through the locator with the road bed is fixed, the ventilation pipe is transversely buried in the road bed and be located the downside geogrid downside, the both ends of ventilation pipe all extend road bed both sides and both sides port department all are equipped with the mouth of pipe baffle, still install the direct current exhaust fan in the ventilation pipe, the direct current exhaust fan is connected with the power supply box electricity, the power supply box still electricity is connected with solar panel.
Preferably, the catheter comprises at least two longitudinal side pipes and one transverse side pipe, wherein one ends, close to the main pipes, of the two longitudinal side pipes and the transverse side pipe are communicated with the main pipe, the two longitudinal side pipes are on the same plane, the included angles between the longitudinal side pipes and the horizontal line are 20-30 degrees, the transverse side pipe is positioned on the bisector of the included angles of the two longitudinal side pipes, the transverse side pipe is perpendicular to the plane where the two longitudinal side pipes are positioned, and the included angles between the transverse side pipe and the horizontal line are set.
Preferably, the two layers of geogrids are respectively arranged at the position of 3/5 roadbed height and the position of 4/5 roadbed height from the foundation.
Preferably, the ventilation pipe is a reinforced concrete circular pipe, the distance between the centers of two adjacent ventilation pipes is 4 times the length of the outer pipe diameter, and the ventilation pipe is arranged at a position from the foundation to the height of 2/5 roadbed.
Preferably, the fins are formed by fixedly connecting upper and lower layers of hollow structural steel plates, the included angle between the upper layer of steel plates and a vertical line is 60-85 degrees, the included angle between the lower layer of steel plates and the vertical line is 105-155 degrees, the transverse length of each fin is 200-230 mm, a space is arranged between every two adjacent fins, and the total length of all the fins wound on the main pipe is 2.5-3.0 m.
Preferably, a plurality of heat conducting rods are distributed along two sides of the roadbed along the frozen soil, the heat conducting rods are inserted and installed on the roadbed, the transverse distance between each heat conducting rod and the slope toe of the roadbed is 1m-1.2m, and the longitudinal distance between every two adjacent heat conducting rods is 4.8m-5.2m.
Preferably, the locator adopts smooth round steel bars, and the penetration depth of the locator is not less than 80mm.
Preferably, the outer diameter of the main pipe is 100mm-110mm, the wall thickness of the main pipe is 8mm-10mm, and the length of the main pipe between the fin and the longitudinal side pipe is 9m-11m.
Compared with the prior art, the frozen soil area anti-thawing and sinking composite roadbed structure has the following beneficial effects:
the heat conducting rod system has a large refrigeration and cooling action range, can effectively absorb the redundant heat of roadbed substrates and the frozen soil foundations below the outer sides of the slope feet on both sides, maintains the stability of permafrost, reduces road diseases, and is favorable for condensation and heat dissipation of vaporized ammonia and liquid ammonia reflux due to the design of the fin structure, and has good heat dissipation effect and high operation efficiency.
Drawings
FIG. 1 is a diagram showing the structure distribution of a main pipe, fins and a heat absorbing evaporation section in the present utility model;
FIG. 2 is a schematic view of a fin according to the present utility model;
fig. 3 is a schematic diagram of the overall layout structure of the present utility model.
Reference numerals illustrate:
1. a main pipe; 2. a longitudinal side pipe; 3. a lateral tube; 4. a fin; 5. burying a depth marking line; 6. a foundation; 7. a solar panel; 8. a power box; 9. a wire; 10. a ventilation pipe; 11. a direct current exhaust fan; 12. geogrid.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In addition, the technical solutions of the embodiments of the present utility model may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present utility model.
Referring to fig. 1 to 3, in order to solve the problem that the heat absorption range of the hot rod technology adopted in road construction of the permafrost region of the Qinghai-Tibet plateau is small, the heat of the subgrade slope underfoot frozen soil foundation 6 is mainly absorbed, and cannot act on the subgrade center underfoot frozen soil foundation 6, so that the hot rod protection effect is greatly reduced, and the existing hot rods and fins 4 have poor heat dissipation effect, so that the quick liquefaction and backflow of a gas working medium are not facilitated; the embodiment provides a frozen soil area anti-thawing composite roadbed structure, which comprises a main pipe 1, wherein the main pipe 1 adopts a vacuum-pumping closed steel pipe, the main pipe 1 adopts a hollow pipe with the outer diameter of 100-110 mm and the pipe wall thickness of about 8-10 mm, one end of the main pipe 1 is buried in a foundation 6, and a buried depth marking 5 is arranged on the pipe body of the main pipe 1; the end part of the main pipe 1 embedded in the roadbed is provided with a heat absorption evaporation section, the heat absorption evaporation section consists of two longitudinal side pipes 2 and one transverse side pipe 3 and is a vacuum-pumping closed steel pipe with the same structure as the main pipe 1, the longitudinal side pipes 2 and the transverse side pipes 3 are fixedly connected to the same end of the main pipe 1, meanwhile, the two longitudinal side pipes 2 and the transverse side pipes 3 are obliquely arranged and are embedded in a foundation 6, and liquid ammonia with the length of about 1.5m is injected into the longitudinal side pipes 2 and the transverse side pipes 3; further, a plurality of fins 4 with hollow structures are uniformly wound on one end of the main pipe 1 exposed above the foundation 6, the fins 4 and the main pipe 1 are fixed through welding, a welded junction is polished smoothly, and meanwhile, the cavity of the fins 4 is communicated with the cavity of the main pipe 1; preferably, the total length AC of the fins 4 wound on the main pipe 1 is 2.5m-3.0m, and the existing construction experience and scientific research data are combined, so that the heat dissipation of the gaseous ammonia liquid can be facilitated. The length CF of the main pipe 1 between the fin 4 and the longitudinal side pipe 2 is 9m-11m, and the distance CD from the fin 4 to the buried mark 5 on the main pipe 1 is about 2m. In addition, a plurality of heat conducting rods are distributed along two sides of the frozen soil roadbed, and the heat conducting rods are fixedly arranged on the foundation 6; preferably, the transverse distance between the heat conducting rods and the slope toe of the roadbed is 1m-1.2m, and the longitudinal distance between two adjacent heat conducting rods is 4.8m-5.2m. Further, two layers of geogrids 12 are paved in the roadbed along the height direction of the roadbed, the geogrids 12 are fixed with the foundation 6 by adopting smooth steel bars with nominal diameters of 8mm-10m as positioners, the positioners are fixed with the geogrids 12 in a welding mode, the depth of the positioners in soil is not less than 80mm, the geogrids 12 are fully unfolded into diamond shapes, and the tensile strength is not less than 20MPa; the geogrid 12 is transversely overlapped with the roadbed width and longitudinally and sectionally overlapped on the whole frozen soil roadbed.
Referring to fig. 3, a plurality of ventilation pipes 10 are transversely and uniformly distributed in the roadbed below the geogrid 12 at the lowest side, two ends of each ventilation pipe 10 extend out of two sides of the roadbed, pipe orifice baffles are arranged at pipe ports at two sides of each ventilation pipe 10, pipe orifice baffles are arranged at two sides of each ventilation pipe 10, and the ventilation pipe is opened in a cold season and closed in a hot season, so that the temperature inside the roadbed can be effectively regulated. The inside of the ventilation pipe 10 is also provided with a direct current exhaust fan 11, the direct current exhaust fan 11 is arranged at the position 1/3 of the pipe length from the right side of the ventilation pipe 10, the direct current exhaust fan 11 is electrically connected with a power supply box 8, the power supply box 8 is also electrically connected with a solar panel 7, and the power of the solar panel 7 is 200w. The power supply box 8 provides power support for the direct-current exhaust fan 11.
Further, the two longitudinal side pipes 2 are on the same plane, the included angles between the two longitudinal side pipes and the horizontal line are 20-30 degrees, the transverse side pipe 3 is positioned on the bisector of the included angle between the two longitudinal side pipes 2, the transverse side pipe 3 is perpendicular to the plane where the two longitudinal side pipes 2 are positioned, and the included angle between the transverse side pipe 3 and the horizontal line is 20-30 degrees.
Further, two geogrids 12 are provided at positions 3/5 and 4/5 of the height of the subgrade, respectively, upward from the foundation 6.
Further, the ventilation pipes 10 are reinforced concrete round pipes, the outer pipe diameter is 0.6m-0.7m, the pipe wall thickness is 70mm-80mm, the distance between the centers of two adjacent ventilation pipes 10 at the front and the back is 4 times the outer pipe diameter length, and the pipe center distance of the ventilation pipes 10 is arranged at the position which is upward from the foundation 6 and is 2/5 of the height of the roadbed.
Further, to facilitate reflux after liquefaction of gaseous ammonia. The fins 4 are hollow structures formed by welding two layers of steel plates with the thickness of about 2mm, the included angle alpha between the upper layer of steel plate and the vertical line is preferably 75 degrees, the included angle beta between the lower layer of steel plate and the vertical line is preferably 120 degrees, the transverse length of each fin 4 is 200mm-230mm, and the distance between every two adjacent fins 4 is about 300 mm.
The manufacturing material has wide sources and is easy to process and install; the refrigerating and cooling range is wide, the redundant heat of the roadbed base and the roadbed 6 with the two side slope feet extending downwards on the side can be effectively absorbed, the stability of permafrost is maintained, and road diseases are reduced; the fin 4 has novel structural design, is favorable for condensation and heat dissipation of vaporized ammonia and liquid ammonia reflux, and has good heat dissipation effect and high operation efficiency; the structural design of the double-layer geogrid 12 effectively limits the displacement of roadbed filling materials, improves the bearing capacity of the roadbed, and can effectively reduce uneven settlement and longitudinal cracking of the roadbed; the pipe orifice baffles are arranged on two sides of the ventilation pipe 10 by using the memory springs, the heat Ji Zidong is automatically opened in cold seasons, the labor is saved, the effect is good, the solar panel 7 and the storage battery are adopted for supplying power to the built-in exhaust fan 11 of the ventilation pipe 10, and the flow of air in the pipe is forcedly quickened through the exhaust fan 11, so that the better convection heat exchange effect is achieved, the internal temperature of a roadbed is reduced, and the overall stability of the roadbed is improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present utility model without departing from the spirit or scope of the utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. The composite roadbed structure for preventing thawing and sinking in the frozen soil area comprises a roadbed, wherein the roadbed is arranged on the upper side of a foundation (6), and is characterized by further comprising a plurality of heat dissipation components;
the heat dissipation assembly includes:
the heat absorption evaporation section is a plurality of guide pipes buried in the foundation (6);
one end of the main pipe (1) is buried in the foundation (6) and fixedly connected with a plurality of the guide pipes, and the other end of the main pipe extends out of the foundation and is provided with a buried depth marking line (5);
the fins (4) are uniformly distributed at one end of the main pipe (1) deviating from the guide pipe, and the fins (4) are fixedly connected with the main pipe (1);
the main pipe (1), the guide pipe and the fins (4) together form a vacuum-pumping cavity structure, and liquid ammonia is injected into the guide pipe.
2. The frozen soil area anti-thawing composite roadbed structure according to claim 1, characterized in that geogrid (12) and ventilation pipe (10) are further arranged in the roadbed respectively, the geogrid (12) is paved with two layers in the roadbed along the height direction of the roadbed, the geogrid (12) is fixed with the roadbed through a positioner, the ventilation pipe (10) is transversely buried at the lower side of the geogrid (12), two ends of the ventilation pipe (10) extend out of two sides of the roadbed and two side ports are provided with pipe orifice baffles, a direct current exhaust fan (11) is further arranged in the ventilation pipe (10), the direct current exhaust fan (11) is electrically connected with a power supply box (8), and the power supply box (8) is further electrically connected with a solar panel (7).
3. The composite roadbed structure for preventing thawing and sinking in frozen soil areas according to claim 1, wherein the guide pipe comprises at least two longitudinal side pipes (2) and one transverse side pipe (3), one end, close to the main pipe (1), of each longitudinal side pipe (2) and each transverse side pipe (3) is communicated with the main pipe (1), each longitudinal side pipe (2) is in the same plane, the included angle between each longitudinal side pipe and a horizontal line is 20-30 degrees, each transverse side pipe (3) is located on the bisector of the included angle of each longitudinal side pipe (2), each transverse side pipe (3) is perpendicular to the plane where each longitudinal side pipe (2) is located, and each transverse side pipe (3) is provided with an included angle with the horizontal line.
4. The frozen soil area anti-thawing composite roadbed structure according to claim 2, wherein two layers of the geogrid (12) are respectively arranged at the position of 3/5 roadbed height and 4/5 roadbed height upwards from the foundation (6).
5. The composite roadbed structure for preventing thawing and sinking in frozen soil areas according to claim 2, wherein the ventilation pipes (10) are reinforced concrete round pipes, the distance between the pipe centers of two adjacent ventilation pipes (10) at the front and the back is 4 times the length of the outer pipe diameter, and the ventilation pipes (10) are arranged at the position 2/5 of the roadbed height upwards from the foundation (6).
6. The composite roadbed structure for preventing thawing and sinking in frozen soil areas according to claim 1, wherein the fins (4) are steel plates with an upper layer and a lower layer of hollow structures, an included angle between the upper layer of steel plates and a vertical line is 60-85 degrees, an included angle between the lower layer of steel plates and the vertical line is 105-155 degrees, the transverse length of each fin (4) is 200-230 mm, a space is arranged between every two adjacent fins (4), and the total length of all the fins (4) wound on a main pipe is 2.5-3.0 m.
7. The composite roadbed structure for preventing thawing settlement in a frozen soil area according to claim 1, wherein a plurality of heat conducting rods are distributed along two sides of the roadbed of frozen soil, the heat conducting rods are installed on a foundation (6) in an inserted mode, the transverse distance between each heat conducting rod and the slope toe of the roadbed is 1m-1.2m, and the longitudinal distance between every two adjacent heat conducting rods is 4.8m-5.2m.
8. The frozen soil area anti-thawing composite roadbed structure according to claim 2, wherein the locator is made of smooth round steel bars, and the penetration depth of the locator is not less than 80mm.
9. A frozen soil area anti-thawing composite subgrade structure according to claim 3, characterized in that said main pipe (1) has an outer diameter of 100-110 mm and a pipe wall thickness of 8-10 mm, and said main pipe (1) between said fins (4) and said longitudinal side pipes (2) has a pipe length of 9-11 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320282313.5U CN220335609U (en) | 2023-02-22 | 2023-02-22 | Freeze soil area prevents thawing and sinks compound roadbed structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320282313.5U CN220335609U (en) | 2023-02-22 | 2023-02-22 | Freeze soil area prevents thawing and sinks compound roadbed structure |
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| Publication Number | Publication Date |
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| CN220335609U true CN220335609U (en) | 2024-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320282313.5U Active CN220335609U (en) | 2023-02-22 | 2023-02-22 | Freeze soil area prevents thawing and sinks compound roadbed structure |
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| Country | Link |
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| CN (1) | CN220335609U (en) |
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2023
- 2023-02-22 CN CN202320282313.5U patent/CN220335609U/en active Active
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