An artificial freezing system for seepage stratum and construction method

Abstract

The application discloses an artificial freezing system for seepage stratum, comprising: a freezing subsystem, comprising a freezing station, a brine pump and a freezing assembly, the freezing station comprising a compressor, a condenser, an expansion valve and an evaporator connected in sequence, the brine pump being connected with one end of the evaporator, and the freezing assembly comprising at least one freezing pipe, the freezing pipe being buried in a to-be-frozen area of the stratum, and the at least one freezing pipe being connected between the other end of the evaporator and the brine pump; and a magnetic field generating device arranged on a groundwater seepage path of the stratum, the groundwater seepage path comprising a path of groundwater seepage from an unfrozen area of the stratum to the to-be-frozen area. The application also discloses a construction method. The application combines the magnetic field action with seepage, the water is magnetized water after the magnetic field action, the ice-soil cementation can be strengthened when freezing again, the freezing wall strength is enhanced, the time of circle formation is shortened under the seepage environment, the formation efficiency and reliability under the seepage environment are improved, the safety is high, and the energy consumption is reduced.

Description

Technical Field

[0001] This invention relates to the field of freezing construction technology, and in particular to an artificial freezing system and construction method for seepage formations. Background Technology

[0002] Artificial freezing is a key engineering technique that uses artificial refrigeration to freeze water in the soil layer into ice, which then binds to the soil, forming a frozen soil wall. This ice-soil contact is crucial for groundwater control and reinforcement. Due to its high safety factor, wide applicability, excellent water-stopping effect, and minimal environmental impact, it is widely used in major projects such as coastal underground works, river crossings, and sea crossings. However, these projects often face the challenge of groundwater seepage. Seepage can disturb the temperature field, delay the formation of the frozen wall, and affect its thickness and uniformity, thus threatening construction safety.

[0003] Existing countermeasures mostly rely on external control, such as optimizing the arrangement of freezing holes, lowering the refrigerant temperature, or grouting for sealing. These are all passive responses that rely on controlling flow rate or enhancing refrigeration, and they all require a lot of manpower, material resources, and energy. Summary of the Invention

[0004] In view of the shortcomings of existing technologies, the purpose of this invention is to provide an artificial freezing system and construction method for seepage formations.

[0005] To achieve the above objectives, an embodiment of the present invention provides the following technical solution:

[0006] An artificial freezing system for seepage formations, comprising:

[0007] A freezing subsystem includes a freezing station, a brine pump, and a freezing assembly. The freezing station includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence. The brine pump is connected to one end of the evaporator. The freezing assembly includes at least one freezing pipe buried in the area to be frozen in the stratum. The at least one freezing pipe is connected to the other end of the evaporator and the brine pump.

[0008] A magnetic field generating device is arranged on the groundwater seepage path of the stratum, the groundwater seepage path including the path of groundwater seeping from the unfrozen area of ​​the stratum to the unfrozen area.

[0009] As a further improvement of the present invention, the freezing station also includes an oil separator, which is connected to the compressor, the expansion valve and the evaporator respectively.

[0010] As a further improvement of the present invention, the freezing station also includes a liquid collector connected between the condenser and the expansion valve.

[0011] As a further improvement of the present invention, the magnetic field generating device is located on the side closer to the area to be frozen.

[0012] As a further improvement of the present invention, the magnetic field range of the magnetic field generating device covers the groundwater seepage path.

[0013] As a further improvement of the present invention, the magnetic field generating device includes at least one magnetic field generating element, which includes a permanent magnet or an electromagnet with adjustable intensity.

[0014] As a further improvement of the present invention, the number of magnetic field generating elements is two, and the two magnetic field generating elements are arranged opposite each other on both sides of the groundwater seepage path.

[0015] As a further improvement of the present invention, the magnetic field strength of the magnetic field generating device is 100-500mT and the magnetic path length is 30-200cm.

[0016] As a further improvement of the present invention, the groundwater seepage rate of the stratum is 5-40 m / d.

[0017] A construction method using the aforementioned artificial freezing system for seepage formations includes the following steps:

[0018] (1) Turn on the magnetic field generating device. The groundwater flows from the unfrozen area to the area to be frozen. When it passes through the magnetic field generating device, it is magnetized to obtain magnetized water.

[0019] (2) When the magnetized water flows through the at least one freezing pipe, the freezing subsystem is turned on, the low-temperature refrigerant is delivered to the at least one freezing pipe, and the low-temperature refrigerant circulation is realized;

[0020] (3) The magnetized water is frozen into ice in the area to be frozen, and the ice is tightly bonded to the soil, quickly forming a freezing zone.

[0021] The beneficial effects of this invention are:

[0022] This invention breaks through the traditional approach of passively suppressing seepage by actively utilizing groundwater seepage. It combines magnetic field effects with seepage to achieve resource utilization of seepage. At the same time, it combines magnetic field treatment technology with artificial freezing. Water becomes magnetized water after being subjected to the magnetic field. When it is re-frozen, it can strengthen the ice-soil cementation, enhance the strength of the frozen wall, and shorten the looping time in the seepage environment, thereby improving its formation efficiency and reliability in the seepage environment. It has high construction safety, eliminates the need for additional freezing pipes, lowering the refrigerant temperature, and grouting for water sealing, reduces energy consumption, and lowers construction costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the front view structure of a preferred embodiment of the present invention;

[0025] Figure 2 This is a top view of a preferred embodiment of the present invention;

[0026] In the diagram: 1. Freezing subsystem, 11. Freezing station, 111. Compressor, 112. Condenser, 113. Expansion valve, 114. Evaporator, 115. Cooling water pump, 116. Oil separator, 117. Liquid collector, 12. Brine pump, 13. Freezing assembly, 131. Freezing pipe, 2. Magnetic field generator, 21. Permanent magnet, 3. Stratum, 31. Area to be frozen, 32. Groundwater seepage path, 33. Area not to be frozen. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0028] Please see Figure 1 , Figure 2 This application discloses an artificial freezing system for seepage formations, including a freezing subsystem 1 and a magnetic field generating device 2. The freezing subsystem 1 includes a freezing station 11, a brine pump 12, and a freezing assembly 13. The freezing station 11 includes a compressor 111, a condenser 112, an expansion valve 113, and an evaporator 114 connected in sequence. The brine pump 12 is connected to one end of the evaporator 114. The freezing assembly 13 includes at least one freezing pipe 131, which is buried in the area 31 to be frozen in the formation 3. At least one freezing pipe 131 is connected to the other end of the evaporator 114 and the brine pump 12. The magnetic field generating device 2 is arranged on the groundwater seepage path 32 of the formation 3, which includes the path for groundwater to seep from the unfrozen area 33 of the formation 3 to the area 31 to be frozen.

[0029] The refrigeration cycle of the freezing subsystem 1: Compressor 111 compresses the refrigerant into high-temperature, high-pressure vapor, which is then condensed into high-temperature, high-pressure refrigerant by condenser 115. After being throttled by expansion valve 113, the high-temperature, high-pressure refrigerant becomes a low-temperature, low-pressure gas-liquid two-phase mixture, which enters evaporator 114. It exchanges heat with brine, cooling the brine into a low-temperature refrigerant. Brine pump 12 delivers the low-temperature refrigerant to freezing pipe 131, where it absorbs heat from the ground stratum 3 and flows back to evaporator 114, completing the refrigeration cycle. Simultaneously, groundwater flows along the groundwater seepage path 32. Magnetic field generator 2 generates a magnetic field, and the seeping groundwater is magnetized as it passes through the magnetic field generator 2. At this time, the water molecule clusters decrease in size and the surface tension decreases. The magnetized water flows into the area to be frozen 31 and is frozen, accelerating the expansion of the freezing range. Due to the change in the physical properties of the magnetized water, the interfacial bonding force with soil particles is significantly improved, making the ice-soil bond tighter, promoting rapid cloning of the frozen wall, and increasing its strength.

[0030] Preferably, the refrigerant is ammonia or Freon.

[0031] The condenser 112 is connected to a cooling water pump 115, which supplies water.

[0032] In this embodiment, the freezing station 11 further includes an oil separator 116, which is connected to the compressor 111, the expansion valve 113, and the evaporator 114. The oil separator 116 separates the lubricating oil circulating with the refrigerant and returns the separated lubricating oil to the compressor, ensuring stable operation of the refrigeration system.

[0033] Preferably, the freezing station 11 further includes a liquid collector 117, which is connected between the condenser 112 and the expansion valve 113. The liquid collector 117 enables gas-liquid separation and refrigerant storage, protecting the compressor 111 and stabilizing the liquid supply to the evaporator 114.

[0034] Preferably, three freezing pipes 131 are provided, and the three freezing pipes 131 are arranged side by side at intervals along a direction perpendicular to the groundwater seepage path 32.

[0035] To ensure that all groundwater flows through the magnetic field, it is preferable that the magnetic field generating device 2 is located on the side of the area to be frozen 31.

[0036] In this embodiment, the magnetic field of the magnetic field generating device 2 covers the groundwater seepage path 32, ensuring that all groundwater flowing through the magnetic field generating device 2 becomes magnetized water.

[0037] Preferably, the magnetic field generating device 2 includes at least one magnetic field generating element, which includes a permanent magnet 21. It is understood that it is not limited to a permanent magnet 21, and may also be an electromagnet with adjustable intensity.

[0038] In order to increase the magnetic field strength and make the physical properties of groundwater change more significantly after passing through the magnetic field, that is, the water molecule clusters are reduced and the surface tension is reduced more significantly, it is preferable to have two magnetic field generators, which are arranged opposite each other on both sides of the groundwater seepage path 32.

[0039] The magnetic field generating device 2 has a magnetic field strength of 100-500 mT and a magnetic path length of 30-200 cm, which can further increase the changes in the properties of magnetized water. The magnetic path length refers to the path length of groundwater flowing through the magnetic field.

[0040] The groundwater seepage rate in stratum 3 is 5-40 m / d. At this seepage rate, the frozen wall is difficult to seal, allowing groundwater to seep smoothly into the unfrozen area 31.

[0041] This application also discloses a construction method using the aforementioned artificial freezing system for seepage formations, comprising the following steps:

[0042] (1) Turn on the magnetic field generating device. The groundwater flows from the unfrozen area to the area to be frozen. When it passes through the magnetic field generating device, it is magnetized to obtain magnetized water.

[0043] (2) When the magnetized water flows through the at least one freezing pipe, the freezing subsystem is turned on, the low-temperature refrigerant is delivered to the at least one freezing pipe, and the low-temperature refrigerant circulation is realized;

[0044] (3) The magnetized water is frozen into ice in the area to be frozen, and the ice is tightly bonded to the soil, quickly forming a freezing zone.

[0045] To better illustrate the construction method of the present invention, the following are detailed steps.

[0046] (1) Two permanent magnets 21 generate a magnetic field. Groundwater flows from the unfrozen area 33 to the unfrozen area 31 through seepage. When it passes through the two permanent magnets 21, it is magnetized and magnetized water is obtained. At this time, the water molecule clusters decrease and the surface tension decreases.

[0047] (2) When the magnetized water flows through the three freezing pipes 131, the compressor 111 compresses the refrigerant into high-temperature and high-pressure vapor, which is condensed into high-temperature and high-pressure refrigerant by the condenser 115. The high-temperature and high-pressure liquid enters the liquid collector 117 and becomes a low-temperature and low-pressure gas-liquid two-phase mixture after being throttled by the expansion valve 113. It enters the oil separator 116 to separate the lubricating oil and then returns to the crankcase of the compressor 111. At the same time, the gas-liquid two-phase mixture enters the evaporator 114 and exchanges heat with the brine to cool the brine into a low-temperature refrigerant. The brine pump 12 delivers the low-temperature refrigerant to the three freezing pipes 131, absorbs the heat of the stratum 3, and then flows back to the evaporator 114 to realize the low-temperature refrigerant circulation.

[0048] (3) The magnetized water is frozen into ice in the waiting-to-freeze zone 31. Due to the change in the physical properties of the magnetized water, the interfacial bonding force with the soil particles is significantly enhanced, and the ice and soil are tightly bonded together, quickly forming a freezing zone.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An artificial freezing system for seepage formations, characterized in that, include: A freezing subsystem includes a freezing station, a brine pump, and a freezing assembly. The freezing station includes a compressor, a condenser, an expansion valve, and an evaporator connected in sequence. The brine pump is connected to one end of the evaporator. The freezing assembly includes at least one freezing pipe buried in the area to be frozen in the stratum. The at least one freezing pipe is connected to the other end of the evaporator and the brine pump. A magnetic field generating device is arranged on the groundwater seepage path of the stratum, the groundwater seepage path including the path of groundwater seeping from the unfrozen area of ​​the stratum to the unfrozen area.

2. The artificial freezing system for seepage formations according to claim 1, characterized in that, The freezing station also includes an oil separator, which is connected to the compressor, expansion valve and evaporator respectively.

3. The artificial freezing system for seepage formations according to claim 1, characterized in that, The freezing station also includes a liquid collector connected between the condenser and the expansion valve.

4. The artificial freezing system for seepage formations according to claim 1, characterized in that, The magnetic field generating device is located on the side of the area to be frozen.

5. The artificial freezing system for seepage formations according to claim 1, characterized in that, The magnetic field of the magnetic field generating device covers the groundwater seepage path.

6. The artificial freezing system for seepage formations according to claim 1, characterized in that, The magnetic field generating device includes at least one magnetic field generating element, which includes a permanent magnet or an electromagnet with adjustable intensity.

7. The artificial freezing system for seepage formations according to claim 6, characterized in that, The number of magnetic field generators is two, and the two magnetic field generators are arranged opposite each other on both sides of the groundwater seepage path.

8. The artificial freezing system for seepage formations according to claim 1, characterized in that, The magnetic field strength of the magnetic field generating device is 100-500mT and the magnetic path length is 30-200cm.

9. The artificial freezing system for seepage formations according to claim 1, characterized in that, The groundwater seepage rate in the strata is 5-40 m / d.

10. A construction method, characterized in that, Using an artificial freezing system for seepage formations as described in any one of claims 1-9, the method includes the following steps: (1) Turn on the magnetic field generating device. The groundwater flows from the unfrozen area to the area to be frozen. When it passes through the magnetic field generating device, it is magnetized to obtain magnetized water. (2) When the magnetized water flows through the at least one freezing pipe, the freezing subsystem is turned on, the low-temperature refrigerant is delivered to the at least one freezing pipe, and the low-temperature refrigerant circulation is realized; (3) The magnetized water is frozen into ice in the area to be frozen, and the ice is tightly bonded to the soil, quickly forming a freezing zone.

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