EP3441529B1 - Dispositif et procédé de congélation de sol - Google Patents

Dispositif et procédé de congélation de sol Download PDF

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Publication number
EP3441529B1
EP3441529B1 EP17020351.7A EP17020351A EP3441529B1 EP 3441529 B1 EP3441529 B1 EP 3441529B1 EP 17020351 A EP17020351 A EP 17020351A EP 3441529 B1 EP3441529 B1 EP 3441529B1
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EP
European Patent Office
Prior art keywords
section
refrigerant
soil
freezing
temperature
Prior art date
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Active
Application number
EP17020351.7A
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German (de)
English (en)
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EP3441529A1 (fr
Inventor
Ralf Schmand
Abraham Sliwo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Linde GmbH
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Linde GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Linde GmbH filed Critical Linde GmbH
Priority to EP17020351.7A priority Critical patent/EP3441529B1/fr
Priority to PL17020351T priority patent/PL3441529T3/pl
Priority to US16/047,169 priority patent/US10655293B2/en
Priority to SG10201806676VA priority patent/SG10201806676VA/en
Priority to CN201810901652.0A priority patent/CN109387002A/zh
Publication of EP3441529A1 publication Critical patent/EP3441529A1/fr
Application granted granted Critical
Publication of EP3441529B1 publication Critical patent/EP3441529B1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
    • F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
    • E02D3/115—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means by freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D29/00—Arrangement or mounting of control or safety devices

Definitions

  • the invention relates to a device and a method for freezing soil.
  • So-called ground freezing processes or icing processes are used according to the state of the art to consolidate or seal the building ground.
  • Processes that use liquid nitrogen or liquefied air as a coolant.
  • the icing with brine which in turn is tempered by a refrigeration system. Due to the low temperature of the liquid nitrogen, freezing with liquid nitrogen is much faster than with brine, whereas the running costs (energy costs) for longer freezing times are significantly higher with liquid nitrogen than with brine.
  • devices for freezing soil with so-called freezing lances are introduced into the soil for soil freezing processes, the freezing lances having an outer pipe and two downpipes arranged in an interior, such as from document EP2 690 222 A1 known.
  • a refrigerant e.g. a cryogenic liquefied gas such as liquid nitrogen is introduced into the interior.
  • the liquid refrigerant which is in a thermally conductive connection with the outer pipe, removes heat from the surroundings, so that the soil surrounding the freezing lance freezes.
  • the exhaust gas (e.g. gaseous nitrogen) produced in the interior space by evaporation of the refrigerant is conducted to the surface of the earth via the second downpipe using the methods of the prior art.
  • the cold gaseous nitrogen escaping from the second downpipe on the surface of the earth can collect near the ground, which can lead to a risk of suffocation in this area.
  • a first aspect of the invention relates to a device for freezing soil comprising a freezing lance extending along a longitudinal axis, which is designed to be introduced into the ground for freezing soil, the freezing lance having a jacket which has an interior space with a first section (also referred to as freezing area) for receiving a liquid refrigerant, wherein the soil surrounding the freezing lance can be cooled by means of the refrigerant located in the first section or heat can be extracted from the soil surrounding the freezing lance by means of the refrigerant located in the first section, so that the soil at least partially freezes, and a line projecting into the interior space for providing the liquid refrigerant in the first section of the interior space, the device having a first end section at which a first opening is formed for withdrawing a refrigerant by evaporation eten exhaust gas is provided from the interior, the interior having a second section (also referred to as the heating area) adjoining the first section along the longitudinal axis for receiving the exhaust gas, so that the exhaust gas in the
  • heat is exchangeable in the second section between the exhaust gas located in the interior or flowing through the interior and the jacket, so that the exhaust gas can be heated through the jacket with the soil adjacent to the freezing lance.
  • Said first end section can be passed through the freezing lance or its jacket, or through a separate part, e.g. a freezer head.
  • the device also has a freezing head connected to the freezing lance at the first end section, the freezing head in particular forming the first end section.
  • the freezing head in particular has the line for providing the liquid refrigerant and / or the first opening for drawing off the exhaust gas.
  • the freezer head can form at least a part of the second section for receiving the exhaust gas.
  • the freezer head can e.g. be soldered onto the freezing lance.
  • the freezer head is in particular outside the ground.
  • the soil surrounding the freezing lance is advantageously used to heat the exhaust gas. Separate devices for heating the exhaust gas flow can thus be omitted and costs and energy are saved.
  • first end section adjoins the second section and the jacket has a second end section which adjoins the first section.
  • Said device can, when used as intended, e.g. be arranged such that the longitudinal axis is vertical, the first section being arranged below the second section, and the first end section of the shell being arranged above.
  • the first end section is arranged outside the soil to be frozen.
  • the device can be oriented in any other direction when used as intended.
  • the freezing lance can e.g. Have a total length of 20 meters, with the bottom 10 meters forming the first section and the top 10 meters forming the second section.
  • an opening in the conduit for providing the coolant can be positioned at a depth of 19.7 meters, i.e. 0.3 meters above the lower end of the freezing lance.
  • the device for freezing soil has a first device for temperature measurement, in particular a temperature measuring lance, positioned at a transition area between the first section and the second section, which is designed to be at the transition area between the first section and the second section measure the temperature of the exhaust gas.
  • thermocouple for example, can be inserted directly into the freezing lance so that direct temperature measurement is possible.
  • the temperature of the first section can thus be set more precisely (optimized temperature control at the point of use), in particular when the exhaust gas flow is heated on the way to the earth's surface. This leads to cost savings due to a more precisely determinable consumption of refrigerant.
  • the first device for temperature measurement can e.g. be positioned at a depth of 10 meters with respect to the surface of the earth if the total length of the freezing lance is 20 meters and the lower 10 meters are used as the first section.
  • the first device for temperature measurement is displaceable along the longitudinal axis.
  • freezer sections that is to say in particular heights or depths of the first section and of the second section
  • different freezer sections can advantageously be set flexibly (for the respective application).
  • the device for freezing earth has a second device for temperature measurement which is positioned at the first opening and is designed to measure the temperature of the exhaust gas at the first opening.
  • the exhaust gas temperature can be determined in a simple manner, whereby conclusions can be drawn about the temperature in the first section.
  • the flow of refrigerant into the first section can be controlled or regulated in order to achieve or maintain a specific temperature of the first section.
  • both a first device for measuring the temperature of the exhaust gas at the transition area between the first section and the second section and a second device for measuring the temperature of the exhaust gas at the first opening can also be provided.
  • a second aspect of the invention relates to a method for freezing soil by means of a device for freezing soil according to the first aspect of the invention, wherein the freezing lance is at least partially inserted into the ground, and wherein a liquid refrigerant is provided in the first section of the interior of the freezing lance
  • the soil surrounding the freezing lance is cooled by means of the refrigerant located in the first section, so that the soil at least partially freezes, and in a second section adjoining the first section an exhaust gas is formed by evaporation of the refrigerant, the exhaust gas is withdrawn from the interior space at the first end section of the freezing lance, and wherein the exhaust gas exchanges heat with the jacket in the second section, so that the exhaust gas is heated by heat exchange with the soil adjacent to the jacket.
  • the heat exchange between the exhaust gas and the ground takes place mainly via that section of the shell that surrounds the second section or heating area of the interior.
  • the refrigerant is a cryogenic liquefied gas, in particular liquid nitrogen (N 2 ).
  • a first temperature of the exhaust gas is measured at the transition region between the first section and the second section, in particular by means of the first device for temperature measurement.
  • a second temperature in particular of the exhaust gas withdrawn from the interior, is measured at the first opening on the first end section of the freezing lance (e.g. at the freezing head), in particular by means of the second device for temperature measurement.
  • an inflow of the refrigerant into the interior is controlled or regulated by means of the first temperature and / or the second temperature, in particular by means of a control and / or regulating device.
  • the inflow of the refrigerant into the first section can be controlled or regulated, for example, by means of a valve, a flow connection being established by means of the valve can be interrupted and / or throttled between a refrigerant container and the first section, in particular the line.
  • a plurality of freezing lances are introduced into the ground, the first temperature and / or the second temperature being measured on only some of the freezing lances.
  • the plurality of freezing lances are provided in a so-called freezing field, which is formed from a plurality of freezing lances which are intended to freeze a section of the ground.
  • some of the freezing lances are equipped with a device for temperature measurement, in particular a temperature lance (e.g. 10% of the freezing lances)
  • the other freezing lances are then adapted in particular via setting values on the exhaust gas side (i.e., for example via the target value of the exhaust gas temperature at the first end section of the respective freezing lance) this means that the coolant flow is adjusted accordingly so that a certain temperature prevails in the first section.
  • a temperature lance e.g. 10% of the freezing lances
  • setting values on the exhaust gas side i.e., for example via the target value of the exhaust gas temperature at the first end section of the respective freezing lance
  • the refrigerant is stored in a refrigerant container at overpressure, that is to say when the pressure is higher than atmospheric pressure, the refrigerant being introduced from the refrigerant container into the first section of the interior space, and the exhaust gas being caused by a pressure difference between the Interior space and a surrounding area of the freezing lance that is in flow connection with the first opening is withdrawn from the interior space via the first opening.
  • the refrigerant is stored in the refrigerant container at an absolute pressure of 2 bar to 20 bar, in particular 6 bar to 16 bar, preferably 8 bar to 12 bar.
  • atmospheric pressure prevails in particular on the outlet side of the first opening, that is to say the system comprising the refrigerant container and freezing lance or interior of the freezing lance is depressurized on the outlet side of the first opening.
  • the pressure difference between the interior and the environment therefore leads to the exhaust gas flowing or being pressed through the first opening into the environment.
  • Fig. 1 shows a device 1 according to the invention in longitudinal section with respect to a longitudinal axis L along which the device 1 extends.
  • the device 1 has a freezing lance 10 with a jacket 11, the jacket 11 surrounding an interior space 12, in particular in the circumferential direction with respect to the longitudinal axis L.
  • the jacket 11 can have any shape in cross section with respect to the longitudinal axis L.
  • the jacket 11 is circular in cross section with respect to the longitudinal axis L.
  • the jacket can e.g. have a diameter of 50 to 60 mm, in particular 54 mm.
  • the jacket 11 is made of a material with good thermal conductivity, e.g. Copper, formed so that a good heat transfer between the refrigerant K located in the interior 12 and the surrounding soil is ensured.
  • a material with good thermal conductivity e.g. Copper
  • the jacket 11 has a first end section 2 arranged on the end face with respect to the longitudinal axis L and a second end section 3 arranged opposite the first end section 2 on the end face.
  • the first end section 2 is shown in FIG Fig. 1
  • the embodiment shown is formed by a freezing head 5 which is connected to the freezing lance 10, for example by soldering.
  • the longitudinal axis L runs vertically, for example, with the first end section 2 forming the upper end of the freezing lance 10 and in particular being positioned outside the soil to be frozen, and with the second end section 3 forming the lower end of the freezing lance 10 and in particular is positioned in the soil.
  • the second end section 3 is in particular closed, so that no refrigerant K can escape from the interior 12 via the second end section 3.
  • the longitudinal axis runs horizontally or obliquely with respect to the vertical.
  • the interior 12 has a first section 13 or freezing area for receiving a liquid refrigerant K, in particular liquid nitrogen, and a second section 14 or heating area adjoining the first section 13 along the longitudinal axis L for receiving an exhaust gas A formed by the evaporation of the refrigerant K. .
  • the second section 14 is arranged above the first section 13.
  • the lighter exhaust gas A collects above the liquid refrigerant K.
  • phase boundary between the liquid refrigerant K and the gaseous exhaust gas A.
  • a liquid-gas mixture of the refrigerant K can also be present at or near this phase boundary.
  • the line 15 can be brought into flow connection in particular with a refrigerant container 19 for storing the refrigerant K.
  • the refrigerant K is stored in the refrigerant container 19 at overpressure, for example at a pressure of 2 bar to 20 bar, in particular 6 bar to 16 bar, preferably 8 bar to 12 bar, and from the refrigerant container 19 via line 15 into the interior 12 initiated.
  • the flow connection between the refrigerant container 19 and the line 15 can be closed and / or throttled by a valve 20, so that a refrigerant flow or refrigerant inflow into the first section 13 can be controlled via the valve 20.
  • the line 15 can, for example, have a diameter of 6 mm to 28 mm, in particular 12 mm.
  • the line 15 can in particular be thermally insulated.
  • a first device 17 for temperature measurement for example a temperature measuring lance
  • the device 17 for temperature measurement or a temperature sensor arranged at its end is arranged in the vicinity of the transition area 4 between the first section 13 and the second section 14, so that the temperature of the exhaust gas A can be measured directly after the refrigerant K has evaporated.
  • relatively precise conclusions can be drawn about the temperature of the first section 13, so that a refrigerant inflow from the refrigerant container 19 into the first section 13 can be precisely regulated in order to correct temperature deviations from the setpoint.
  • the exhaust gas A formed by the evaporation of the refrigerant K flows upwards in the second section 14 of the interior 12, heat being exchanged between the exhaust gas A via the jacket 11 with the surrounding soil, so that the exhaust gas A is in the second section when it rises 14 heated.
  • a first opening 16 for drawing off the heated exhaust gas A and a second opening 22 for drawing off the heated exhaust gas A are provided on the freezing head 5 at the first end section 2, ie in particular at the upper end of the freezing lance 10.
  • the interior 12 is in flow communication with an environment in particular via the first opening 16 and the second opening 22, with atmospheric pressure prevailing in the environment.
  • the exhaust gas A flows into the surroundings from the first opening 16 and the second opening 22, in particular due to the pressure difference between the system comprising the refrigerant container 19 and the interior 12 to the surroundings.
  • the first opening 16 shown is positioned perpendicular to the longitudinal axis L and the second opening 22 is arranged on the end face with respect to the longitudinal axis L, that is to say on the first end section 2.
  • the jacket 11 can also be provided. This can be arranged perpendicular to the longitudinal axis L or at the end.
  • An optional second device 18 for measuring the temperature of the exhaust gas A is positioned at the first opening 16.
  • the first opening 16 is mainly used to measure the temperature of the exhaust gas A, while the main portion of the exhaust gas A leaves the interior space 12 through the second opening 22 and in particular exits into the environment.
  • the second device 18 for temperature measurement can be arranged on the second opening 22 instead of the first opening 16, or a respective device for measuring the temperature of the exhaust gas A can be provided both on the first opening 16 and on the second opening 22.
  • the arrangement shown of the first opening 16 and the second opening 22 can be realized, for example, by a T-piece, wherein a first arm of the T-piece is connected to the jacket 11, and wherein a second arm of the T- Piece forms the first opening 16, and wherein a third arm running parallel to the first arm and opposite the first arm forms the second opening 22.
  • a control and / or regulating device 21 is also shown, which is connected to the first device 17 for temperature measurement, the second device 18 for temperature measurement and the valve 20 in such a way that a temperature of the exhaust gas A from the first device 17 for temperature measurement and / or the second device 18 for temperature measurement and can be transmitted as an actual variable to the control and / or regulating device 21, wherein the control and / or regulating device 21 is designed to regulate the valve 20 so that the inflow of the refrigerant K from the refrigerant container 19 into the first section 13 of the interior 12 of the freezing lance 10 is set in such a way that the temperature of the exhaust gas A is adapted to a predetermined setpoint value.
  • This setpoint is selected in particular so that the temperature of the refrigerant K in the first section 13 has a temperature required to freeze the ground (that is, is kept at the temperature or is brought to the temperature) when the temperature of the exhaust gas A reaches the setpoint corresponds.
  • refrigerant K can be introduced into the first section 13 via the valve 20, for example intermittently, as a result of which the temperature of the refrigerant K in the first section 13 is reduced.
  • a corresponding control and / or regulating device 21 can also only receive temperature data from one of the devices 17, 18 for temperature measurement (i.e. either with an exhaust gas temperature measured at the transition area 4 or with an exhaust gas temperature measured at the first opening 16 at the first end section).
  • control and / or regulating device 21 controls or regulates the inflow of the refrigerant K into the first section 13 not via the valve 20 but in another suitable manner.

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)

Claims (11)

  1. Dispositif (1) de congélation de sol, comprenant
    - une lance de congélation (10) s'étendant le long d'un axe longitudinal (L), laquelle est conçue pour être introduite dans le sol pour congeler le sol, dans lequel ladite lance de congélation (10) comporte une enveloppe (11), laquelle entoure un espace intérieur (12) doté d'une première section (13) destinée à la réception d'un agent de refroidissement (K) liquide, dans lequel le sol entourant la lance de congélation (10) peut être refroidi au moyen de l'agent de refroidissement (K) se trouvant dans la première section (13),
    - une conduite (15) faisant saillie dans l'espace intérieur (12) destinée à fournir l'agent de refroidissement (K) liquide dans la première section (13) de l'espace intérieur (12),
    - dans lequel ledit dispositif (1) comporte une première section d'extrémité (2) pourvue d'une première ouverture (16) destinée à l'évacuation d'un gaz d'échappement (A), formé par évaporation de l'agent de refroidissement (K), de l'espace intérieur (12),
    caractérisé en ce
    que l'espace intérieur (12) comporte une seconde section (14) adjacente à la première section (13) le long de l'axe longitudinal (L) destinée à la réception du gaz d'échappement (A) de telle sorte que le gaz d'échappement (A) dans la seconde section (14) peut venir en contact avec l'enveloppe (11).
  2. Dispositif (1) de congélation de sol selon la revendication 1, caractérisé en ce que ledit dispositif (1) comporte un premier équipement (17) de mesure de température positionné sur une zone de transition (4) entre la première section (13) et la seconde section (14), lequel est conçu pour mesurer la température du gaz d'échappement (A) au niveau de la zone de transition (4) entre la première section (13) et la seconde section (14).
  3. Dispositif (1) de congélation de sol selon la revendication 2, caractérisé en ce que le premier équipement (17) de mesure de température est déplaçable le long de l'axe longitudinal (L).
  4. Dispositif (1) de congélation de sol selon l'une quelconque des revendications 1 à 3, caractérisé en ce que ledit dispositif (1) comporte un second équipement (18) de mesure de température positionné au niveau de la première ouverture (16), lequel est conçu pour mesurer la température du gaz d'échappement (A) au niveau de la première ouverture (16).
  5. Procédé de congélation de sol au moyen d'un dispositif (1) de congélation de sol selon l'une quelconque des revendications 1 à 4, dans lequel la lance de congélation (10) est introduite dans le sol et dans lequel, dans la première section (13), un agent de refroidissement (K) liquide est fourni, dans lequel le sol entourant la lance de congélation (10) est refroidi au moyen de l'agent de refroidissement (K) se trouvant dans la première section (13) de telle sorte que le sol est au moins partiellement congelé, et dans lequel, dans une seconde section (14) adjacente à la première section (13), par évaporation de l'agent de refroidissement (K), un gaz d'échappement (A) est formé, dans lequel le gaz d'échappement (A) est évacué, au niveau de la première section d'extrémité (2) de la lance de congélation (10), de l'espace intérieur (12), et dans lequel le gaz d'échappement (A) dans la seconde section (14) échange de la chaleur avec l'enveloppe (11) de telle sorte que le gaz d'échappement (A) est réchauffé par échange de chaleur avec le sol adjacent à l'enveloppe (11).
  6. Procédé selon la revendication 5, dans lequel l'agent de refroidissement (K) est un gaz liquéfié fortement réfrigéré, en particulier l'azote (N2) liquide.
  7. Procédé selon la revendication 5 ou 6, dans lequel au niveau de la zone de transition (4) entre la première section (13) et la seconde section (14), une première température du gaz d'échappement (A) est mesurée.
  8. Procédé selon l'une quelconque des revendications 5 à 7, dans lequel, au niveau de la première ouverture (16), une seconde température du gaz d'échappement (A) est mesurée.
  9. Procédé selon la revendication 7 ou 8, dans lequel, au moyen de la première température et/ou de la seconde température, un afflux de l'agent de refroidissement (L) dans l'espace intérieur (12) est commandé ou régulé.
  10. Procédé selon l'une quelconque des revendications 5 à 9, dans lequel une pluralité de lances de congélation (10) sont introduites dans le sol, et dans lequel la première température et/ou la seconde température est mesurée uniquement au niveau d'une partie des lances de congélation (10).
  11. Procédé selon l'une quelconque des revendications 5 à 10, dans lequel l'agent de refroidissement (K), en cas de surpression, est stocké dans un récipient d'agent de refroidissement (19), et dans lequel l'agent de refroidissement (K) est introduit du récipient d'agent de refroidissement (19) vers la première section (13) de l'espace intérieur (12), et dans lequel le gaz d'échappement (A) est retiré à travers la première ouverture (16), par une différence de pression entre l'espace intérieur (12) et un environnement de la lance de congélation (10) en liaison fluidique avec la première ouverture (16), de l'espace intérieur (12).
EP17020351.7A 2017-08-10 2017-08-10 Dispositif et procédé de congélation de sol Active EP3441529B1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP17020351.7A EP3441529B1 (fr) 2017-08-10 2017-08-10 Dispositif et procédé de congélation de sol
PL17020351T PL3441529T3 (pl) 2017-08-10 2017-08-10 Urządzenie i sposób zamrażania gruntu
US16/047,169 US10655293B2 (en) 2017-08-10 2018-07-27 Device and method for ground freezing
SG10201806676VA SG10201806676VA (en) 2017-08-10 2018-08-06 Device and method for ground freezing
CN201810901652.0A CN109387002A (zh) 2017-08-10 2018-08-09 地面冻结装置及方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17020351.7A EP3441529B1 (fr) 2017-08-10 2017-08-10 Dispositif et procédé de congélation de sol

Publications (2)

Publication Number Publication Date
EP3441529A1 EP3441529A1 (fr) 2019-02-13
EP3441529B1 true EP3441529B1 (fr) 2020-09-30

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EP17020351.7A Active EP3441529B1 (fr) 2017-08-10 2017-08-10 Dispositif et procédé de congélation de sol

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US (1) US10655293B2 (fr)
EP (1) EP3441529B1 (fr)
CN (1) CN109387002A (fr)
PL (1) PL3441529T3 (fr)
SG (1) SG10201806676VA (fr)

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CN109387002A (zh) 2019-02-26
SG10201806676VA (en) 2019-03-28
PL3441529T3 (pl) 2021-04-06
US20190048549A1 (en) 2019-02-14
US10655293B2 (en) 2020-05-19

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