Water flow self-circulation device for prefabricated segment high-capacity maintenance pool

Abstract

The invention relates to a water flow self-circulation device for a prefabricated segment high-capacity maintenance pool. The water flow self-circulation device for the high-capacity maintenance pool for the prefabricated pipe pieces comprises the high-capacity maintenance pool and an inner wall cleaning mechanism arranged in the high-capacity maintenance pool. The large-capacity maintenance water tank comprises a first maintenance water tank, a second maintenance water tank, a third maintenance water tank, a fourth maintenance water tank, a fifth maintenance water tank, a sixth maintenance water tank, a seventh maintenance water tank and an eighth maintenance water tank which are sequentially communicated through communicating pipes connected in a penetrating mode at the bottoms, and a communicating vessel is arranged on the inner surface of each water tank; a drainage pipe with a normally-closed valve is arranged at the bottom of each water tank, and an inner wall cleaning mechanism is arranged in each water tank; a water injection pipe is connected to the outer side surface of the first maintenance pool and connected with a water pump. The operation time of the water pump can be shortened, meanwhile, the water changing time of the multiple pools can be shortened, and the use efficiency of the high-capacity maintenance pool is improved.

Description

Technical Field

[0001] This application relates to the field of precast tunnel segment maintenance technology, and in particular to a device for self-circulating water in a large-capacity maintenance pool for precast tunnel segments. Background Technology

[0002] Precast tunnel segments are curved concrete components made primarily of steel reinforcement and concrete, prefabricated in a factory. They are mainly used for supporting linings in underground structures such as tunnels and subways, primarily in shield tunneling construction, serving as the tunnel's "skeleton" support structure. After assembly, they form a ring-shaped space to protect the tunnel boring machine (TBM) during operation. They are manufactured using a mold-forming process, involving steel reinforcement binding, concrete pouring, and curing, meeting the requirements of the national standard GB / T 22082-2017. The precast tunnel segment curing water tank is an essential facility for the formation of concrete strength during the segment production process. By controlling the temperature and humidity environment, the quality of the segments is ensured. After demolding, the segments are placed in the curing water tank (commonly known as a "water curing tank") to carry out the cement hydration reaction, replenish the moisture lost due to high-temperature evaporation, prevent concrete cracking, and ensure that the strength meets the standards. This process is similar to the water curing after road construction.

[0003] However, in existing technologies, water changes in water tanks are commonly done manually. This method is time-consuming and labor-intensive, requires a large investment of human capital, and cannot be performed regularly. Furthermore, changing water in multiple large-capacity tanks wastes a lot of water and adds considerable time when changing water in multiple large-capacity tanks. Moreover, after prolonged use, the inner walls of the water tanks accumulate a lot of dust, making it difficult for staff to clean and use them, thus reducing the efficiency of the water tanks. Summary of the Invention

[0004] To solve or partially solve the problems existing in the related technologies, this application provides a device for self-circulating water in a large-capacity curing water tank for precast tunnel segments, which can reduce the running time of water pumps and shorten the water replacement time of multiple water tanks, thereby improving the utilization efficiency of the large-capacity curing water tank.

[0005] This application provides a device for self-circulating water in a large-capacity curing tank for precast tunnel segments, comprising: Large-capacity maintenance water tank; An internal wall cleaning mechanism installed inside a large-capacity maintenance water tank; The large-capacity maintenance water tank includes a first maintenance water tank 1, a second maintenance water tank 2, a third maintenance water tank 3, a fourth maintenance water tank 4, a fifth maintenance water tank 5, a sixth maintenance water tank 6, a seventh maintenance water tank 7, and an eighth maintenance water tank 8, which are connected sequentially by a connecting pipe 9 that runs through the bottom. Each water tank has a connecting device 26 on its inner surface to keep the liquid levels of the eight water tanks level. Each water tank has a drain pipe with a normally closed valve at the bottom and an inner wall cleaning mechanism inside. The outer surface of the first maintenance water tank 1 is connected to a water injection pipe 10, which is connected to a water pump 11.

[0006] Optionally, in some embodiments, the inner wall cleaning mechanism includes a fixed frame 28 fixedly installed on the inner surface of the top of the maintenance pool and a fixed bottom frame 33 fixedly installed at the bottom of the inner cavity of the maintenance pool. A drive motor 27 is provided on the upper surface of the fixed frame 28. The drive shaft of the drive motor 27 rotates through the fixed frame 28 and is connected to a lead screw 30. The bottom end of the lead screw 30 is rotatably connected to the fixed bottom frame 33. A cleaning frame 31 is threadedly connected to the outer surface of the lead screw 30. A brush 32 is installed on the outer surface of the cleaning frame 31. The drive motor 27 drives the lead screw 30 to rotate, causing the cleaning frame 31 to move up and down. The brush 32 on the cleaning frame 31 scrubs and cleans the inner wall of the maintenance pool.

[0007] Optionally, in some solutions, two drive motors 27 are provided, and the two drive motors 27 operate synchronously and are symmetrically arranged on the top left and right sides of the fixed frame 28. The cleaning frame 31 is moved stably through two lead screws 30. Guide rods 29 are vertically installed on the front and rear sides of the fixed frame 28. The top end of the guide rod 29 is fixed to the fixed frame 28, the bottom end is fixed to the fixed bottom frame 33, and the middle part is slidably connected to the cleaning frame 31.

[0008] Optionally, in some embodiments, a first water level gauge 21 is provided on the upper inner surface of the first maintenance water tank 1, and a second water level gauge 22 is provided on the lower side of the first water level gauge 21.

[0009] Optionally, in some embodiments, a controller 12 is provided on the outer surface of the first maintenance water tank 1. The controller 12 is electrically connected to a timer 13. The first water level gauge 21 and the second water level gauge 22 are electrically connected to the controller 12. The second water level gauge 22 monitors the water level in the first maintenance water tank 1 in real time. The first water level gauge 21 controls the water pump 11 to shut down through the controller 12.

[0010] Optionally, in some embodiments, the inner central surface of the maintenance pool is provided with a grate 23, which has a mesh structure.

[0011] Optionally, in some embodiments, a cooler 24 and a heater 25 are provided on one side of the inner wall of the curing water tank below the grate 23, and a thermometer 19 is provided on the other side. The cooler 24, the heater 25 and the thermometer 19 are electrically connected to the controller 12. The thermometer 19 transmits the temperature signal to the controller 12, and the controller 12 starts the heater 25 or the cooler 24 to work.

[0012] Optionally, in some embodiments, a stirring mechanism is provided at the bottom of the inner cavity of the curing water tank. The stirring mechanism is located below the grate 23. The stirring mechanism drives the water to flow, thereby enabling the water temperature in the curing water tank to be kept consistent quickly.

[0013] Optionally, in some embodiments, the stirring mechanism includes a fixed base 20 installed at the bottom of the inner cavity of the curing water tank. A motor 18 is installed on the upper surface of the fixed base 20. A reducer 17 is connected to the upper surface of the motor 18. A connecting shaft 15 is rotatably connected to the upper surface of the reducer 17. A stirring rod 14 is connected to the upper surface of the connecting shaft 15. A stirring blade 16 is installed on the upper outer surface of the stirring rod 14. A waterproof cover is provided on the outer side of the reducer 17, the motor 18, and the fixed base 20. The connecting shaft 15 passes through the waterproof cover and is rotatably connected to the waterproof cover. The connection point is waterproofed to prevent water from entering the waterproof cover and damaging the motor.

[0014] The technical solution provided in this application may include the following beneficial effects: This application utilizes a connecting pipe to connect multiple large-capacity maintenance water tanks, enabling media transmission and ensuring pressure balance within each tank. By interconnecting eight tanks, the water source can be circulated, conserving water and aligning with national energy conservation and emission reduction policies. An injection pipe connects to externally supplied water, maintaining a water level of approximately 1.6 meters across all eight tanks, enhancing both efficiency and practicality. A water pump draws external water and injects it into the large-capacity maintenance water tanks, improving injection efficiency and reducing injection time.

[0015] By using a connecting device, when the liquid inside the pool is not flowing, the connecting device will keep the liquid levels of the eight pools at the same level. If there is a height difference in the liquid level, the liquid will flow from the pool with the higher liquid level to the pool with the lower liquid level, thus forming a deep water gravity flow. This allows for gravity flow of 1.6 meters of water in the eight pools, thereby reducing the operating time of the water pump and shortening the water change time of the eight pools, thus improving the utilization efficiency of the large-capacity maintenance pool.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0017] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0018] Figure 1 This is a schematic diagram of the structure of a device for self-circulating water in a large-capacity curing pool for precast tunnel segments, as shown in an embodiment of this application. Figure 2 This is a schematic diagram of the structure of the communicating vessel shown in the embodiments of this application; Figure 3 This is a schematic diagram of the installation structure of the inner wall cleaning mechanism shown in the embodiments of this application; Figure 4 This is a schematic diagram of the internal wall cleaning mechanism shown in the embodiments of this application; Figure 5 This is a schematic diagram of the internal structure of the maintenance water tank shown in an embodiment of this application.

[0019] Figure label: 1. First curing water tank; 2. Second curing water tank; 3. Third curing water tank; 4. Fourth curing water tank; 5. Fifth curing water tank; 6. Sixth curing water tank; 7. Seventh curing water tank; 8. Eighth curing water tank; 9. Connecting pipe; 10. Water injection pipe; 11. Water pump; 12. Controller; 13. Timer; 14. Stirring rod; 15. Connecting shaft; 16. Stirring blade; 17. Reducer; 18. Motor; 19. Thermostat; 20. Fixing base; 21. First water level gauge; 22. Second water level gauge; 23. Grate; 24. Refrigerator; 25. Heater; 26. Communicating device; 27. Drive motor; 28. Fixing frame; 29. ​​Guide rod; 30. Lead screw; 31. Cleaning frame; 32. Brush; 33. Fixing base frame. Detailed Implementation

[0020] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0021] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] In the description of this application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] To address the aforementioned issues, this application provides a device for self-circulating water in a large-capacity curing water tank for precast tunnel segments. This device reduces the operating time of water pumps and shortens the water exchange time for multiple tanks, thereby improving the utilization efficiency of the large-capacity curing water tank.

[0025] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0026] See Figure 1-2 The device for self-circulating water in the large-capacity curing pool for precast tunnel segments includes: Large-capacity maintenance water tank; An internal wall cleaning mechanism installed inside a large-capacity maintenance water tank; The large-capacity maintenance water tank includes a first maintenance water tank 1, a second maintenance water tank 2, a third maintenance water tank 3, a fourth maintenance water tank 4, a fifth maintenance water tank 5, a sixth maintenance water tank 6, a seventh maintenance water tank 7, and an eighth maintenance water tank 8, which are connected sequentially by a connecting pipe 9 that runs through the bottom. Each water tank has a connecting device 26 on its inner surface to keep the liquid levels of the eight water tanks level. Each water tank has a drain pipe with a normally closed valve at the bottom and an inner wall cleaning mechanism inside. The outer surface of the first maintenance water tank 1 is connected to a water injection pipe 10, which is connected to a water pump 11.

[0027] During operation, the connecting pipe 9 allows connection to multiple large-capacity maintenance water tanks, facilitating media transfer and ensuring pressure balance within each tank. By interconnecting the eight tanks, the water source can be circulated, conserving water and aligning with national energy conservation and emission reduction policies. The water inlet pipe 10 receives externally supplied water, maintaining a water level of approximately 1.6 meters within the eight tanks, enhancing both efficiency and practicality. The water pump 11 draws external water and injects it into the large-capacity maintenance water tanks, improving filling efficiency and reducing filling time. By using the communicating vessel 26, when the liquid inside the pool is not flowing, the communicating vessel 26 will keep the liquid levels of the eight pools at the same level. If there is a height difference in the liquid level, the liquid will flow from the pool with the higher liquid level to the pool with the lower liquid level, thus forming a deep water gravity flow. This enables the gravity flow of 1.6-meter-deep water inside the eight pools, thereby reducing the running time of the water pump 11 and shortening the water replacement time of the eight pools, thus improving the utilization efficiency of the large-capacity maintenance pool.

[0028] See Figure 3-4In some embodiments, the inner wall cleaning mechanism includes a fixed frame 28 fixedly installed on the inner surface of the top of the maintenance pool and a fixed bottom frame 33 fixedly installed on the bottom of the inner cavity of the maintenance pool. A drive motor 27 is provided on the upper surface of the fixed frame 28. The drive shaft of the drive motor 27 rotates through the fixed frame 28 and is connected to a lead screw 30. The bottom end of the lead screw 30 is rotatably connected to the fixed bottom frame 33. A cleaning frame 31 is threadedly connected to the outer surface of the lead screw 30. A brush 32 is installed on the outer surface of the cleaning frame 31. The drive motor 27 drives the lead screw 30 to rotate, causing the cleaning frame 31 to move up and down. The brush 32 on the cleaning frame 31 scrubs and cleans the inner wall of the maintenance pool. There are two drive motors 27, which operate synchronously and are symmetrically arranged on the top left and right sides of the fixed frame 28. They drive the cleaning frame 31 to move stably through two lead screws 30. Guide rods 29 are vertically installed on the front and rear sides of the fixed frame 28. The top of the guide rod 29 is fixed to the fixed frame 28, the bottom is fixed to the fixed bottom frame 33, and the middle is slidably connected to the cleaning frame 31.

[0029] During operation, the water pump 11 draws water from an external source and injects it into the large-capacity maintenance water tank, thereby improving water injection efficiency and shortening the injection time. The communicating vessel 26 keeps the liquid levels in the eight tanks level when the liquid inside is not flowing. If a height difference exists, the liquid flows from the tank with the higher liquid level to the tank with the lower liquid level, creating a deep-water gravity flow. This allows for gravity flow of 1.6 meters of water into the eight tanks, reducing the operating time of the water pump 11 and shortening the water change time in the eight tanks, thus improving the utilization efficiency of the large-capacity maintenance water tank.

[0030] The rotation of the lead screw 30 allows the outer cleaning frame 31 to move up and down reciprocally. The brush 32 installed on the outer surface of the cleaning frame 31 cleans the inner wall of the maintenance pool during the up-and-down movement, ensuring the cleanliness of the maintenance pool. The installed guide rod 29 makes the movement of the outer cleaning frame 31 more convenient and smooth, improving the efficiency of the cleaning device. The installed fixed base frame 33 provides more stable support for the cleaning device above, making it stable and efficient. The wastewater after cleaning can be discharged through the drain pipe.

[0031] See Figure 5In some embodiments, a first water level gauge 21 is provided on the upper inner surface of the first curing water tank 1, and a second water level gauge 22 is provided on the lower side of the first water level gauge 21. A controller 12 is provided on the outer outer surface of the first curing water tank 1, and a timer 13 is electrically connected to the controller 12. The first water level gauge 21 and the second water level gauge 22 are respectively electrically connected to the controller 12. The second water level gauge 22 monitors the water level in the first curing water tank 1 in real time, and the first water level gauge 21 controls the shutdown of the water pump 11 through the controller 12.

[0032] During operation, the first water level gauge 21 and the second water level gauge 22 are of model DP-HCJ1. When the water level of the first maintenance water tank 1 rises to the position of the first water level gauge 21, the controller 12 will shut off the water pump 11 to ensure that the first maintenance water tank 1 will not continue to receive water. The timer 13 is of model KG316. During normal maintenance, the timer 13 can periodically turn on the water pump 11, so that the water in the first maintenance water tank 1 can enter the internal circulation through the water inlet pipe 10, making it practical and versatile.

[0033] In this embodiment, the inner center surface of the maintenance pool is provided with a grate 23, which has a mesh structure.

[0034] During operation, the set grate 23 not only achieves better separation, but also makes the stirring mechanism below operate more stably. Furthermore, the set grate 23 is mesh-like, so it will not affect the internal maintenance water source, thus giving it separation and stability.

[0035] In this embodiment, a cooler 24 and a heater 25 are provided on one side of the inner wall of the curing water tank below the grate 23, and a thermometer 19 is provided on the other side. The cooler 24, the heater 25 and the thermometer 19 are electrically connected to the controller 12. The thermometer 19 transmits the temperature signal to the controller 12, and the controller 12 starts the heater 25 or the cooler 24 to work.

[0036] During operation, the set-up cooler 24 and heater 25 can be used to raise or lower the water temperature inside the first curing water tank 1, thereby ensuring the quality of the cement samples and making them practical and versatile.

[0037] In this embodiment, a stirring mechanism is provided at the bottom of the inner cavity of the curing water tank. The stirring mechanism is located below the grate 23. The stirring mechanism drives the water to flow, thereby ensuring that the water temperature in the curing water tank can be quickly and uniformly maintained. The stirring mechanism includes a fixed base 20 installed at the bottom of the inner cavity of the curing water tank. A motor 18 is installed on the upper surface of the fixed base 20. A reducer 17 is connected to the upper surface of the motor 18. A connecting shaft 15 is rotatably connected to the upper surface of the reducer 17. A stirring rod 14 is connected to the upper surface of the connecting shaft 15. A stirring blade 16 is installed on the upper outer surface of the stirring rod 14. A waterproof cover is provided on the outer side of the reducer 17, the motor 18, and the fixed base 20. The connecting shaft 15 passes through the waterproof cover and is rotatably connected to the waterproof cover. The connection point is waterproofed to prevent water from entering the waterproof cover and damaging the motor.

[0038] During operation, the installed mounting base 20 ensures stable operation of the agitator on its upper surface. The installed motor 18 drives the upper reducer 17 to rotate. The reducer 17 allows for precise adjustment of the output shaft speed and extends the service life of the motor 18, enhancing its stability and practicality. The rotation of the reducer 17 drives the upper connecting shaft 15, which in turn drives the upper agitator rod 14, which in turn drives the outer agitator blades 16 to rotate. The rotation of the agitator blades 16 causes water to flow, thus quickly and consistently maintaining the water temperature in the first curing tank 1, ensuring its adaptability and connectivity.

[0039] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0040] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0041] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A device for self-circulating water in a large-capacity curing tank for precast tunnel segments, characterized in that: The device for self-circulating water in the large-capacity curing pool for precast tunnel segments includes: Large-capacity maintenance water tank; An internal wall cleaning mechanism installed inside a large-capacity maintenance water tank; The large-capacity maintenance water tank includes a first maintenance water tank (1), a second maintenance water tank (2), a third maintenance water tank (3), a fourth maintenance water tank (4), a fifth maintenance water tank (5), a sixth maintenance water tank (6), a seventh maintenance water tank (7), and an eighth maintenance water tank (8) connected sequentially by a connecting pipe (9) that runs through the bottom. Each water tank has a connecting device (26) on its inner surface to keep the liquid levels of the eight water tanks level. Each water tank has a drain pipe with a normally closed valve at the bottom and an inner wall cleaning mechanism inside. The outer surface of the first maintenance water tank (1) is connected to a water injection pipe (10), and the water injection pipe (10) is connected to a water pump (11).

2. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 1, characterized in that: The inner wall cleaning mechanism includes a fixed frame (28) fixedly installed on the inner surface of the top of the maintenance pool and a fixed bottom frame (33) fixedly installed at the bottom of the inner cavity of the maintenance pool. A drive motor (27) is provided on the upper surface of the fixed frame (28). The drive shaft of the drive motor (27) rotates through the fixed frame (28) and is connected to a lead screw (30). The bottom end of the lead screw (30) is rotatably connected to the fixed bottom frame (33). A cleaning frame (31) is threadedly connected to the outer surface of the lead screw (30). A brush (32) is installed on the outer surface of the cleaning frame (31). The drive motor (27) drives the lead screw (30) to rotate, which drives the cleaning frame (31) to move up and down. The brush (32) on the cleaning frame (31) scrubs and cleans the inner wall of the maintenance pool.

3. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 2, characterized in that: The drive motor (27) is provided in two parts. The two drive motors (27) operate synchronously and are symmetrically arranged on the top left and right sides of the fixed frame (28). The cleaning frame (31) is moved stably by two lead screws (30). Guide rods (29) are vertically installed on the front and rear sides of the fixed frame (28). The top end of the guide rod (29) is fixed on the fixed frame (28), the bottom end is fixed on the fixed bottom frame (33), and the middle part is slidably connected to the cleaning frame (31).

4. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 1, 2, or 3, characterized in that: The first maintenance water tank (1) is provided with a first water level gauge (21) on the upper surface inside, and a second water level gauge (22) is provided on the lower side of the first water level gauge (21).

5. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 4, characterized in that: A controller (12) is provided on the outer surface of the first maintenance water tank (1). The controller (12) is electrically connected to a timer (13). The first water level gauge (21) and the second water level gauge (22) are electrically connected to the controller (12). The second water level gauge (22) monitors the water level in the first maintenance water tank (1) in real time. The first water level gauge (21) controls the water pump (11) to shut down through the controller (12).

6. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 5, characterized in that: The inner center surface of the maintenance pool is provided with a grate (23), and the grate (23) has a mesh structure.

7. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 6, characterized in that: A cooler (24) and a heater (25) are provided on one side of the inner wall of the curing water tank below the grate (23), and a thermometer (19) is provided on the other side. The cooler (24), heater (25) and thermometer (19) are electrically connected to the controller (12). The thermometer (19) transmits the temperature signal to the controller (12), and the controller (12) starts the heater (25) or cooler (24) to work.

8. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 7, characterized in that: The bottom of the inner cavity of the maintenance water tank is equipped with a stirring mechanism, which is located below the grate (23). The stirring mechanism drives the water to flow, so that the temperature of the water in the maintenance water tank can be kept consistent quickly.

9. The device for self-circulating water in a large-capacity curing tank for precast tunnel segments according to claim 8, characterized in that: The stirring mechanism includes a fixed base (20) installed at the bottom of the inner cavity of the curing water tank. A motor (18) is installed on the upper surface of the fixed base (20). A reducer (17) is connected to the upper surface of the motor (18). A connecting shaft (15) is rotatably connected to the upper surface of the reducer (17). A stirring rod (14) is connected to the upper surface of the connecting shaft (15). A stirring blade (16) is installed on the upper outer surface of the stirring rod (14). A waterproof cover is provided on the outer side of the reducer (17), the motor (18) and the fixed base (20). The connecting shaft (15) passes through the waterproof cover and is rotatably connected to the waterproof cover. The connection is waterproofed to prevent water from entering the waterproof cover and damaging the motor.

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