Concrete curing construction method in low-temperature environment

Abstract

The invention relates to the technical field of concrete curing, and discloses a concrete curing construction method in a low-temperature environment, which comprises the following steps: S1, arranging a support frame above the surface of concrete; s2, a temperature and humidity sensor is arranged on the supporting frame, and a heating system and a humidifying system are installed; s3, the supporting frame is covered, and a plurality of sealing heat preservation layers are installed on the supporting frame; and S4, the temperature and humidity data are received through the Internet of Things control system, and the operation states of the heating system and the humidifying system are adjusted so that the temperature and humidity in the sealed heat preservation layer can be kept within the set range. A supporting frame is arranged above the surface of concrete, a temperature and humidity sensor, a heating system and a humidifying system are arranged, a closed curing space is formed through a multi-layer sealed heat preservation structure, temperature and humidity data are monitored in combination with an internet-of-things system, heating and humidifying equipment is automatically adjusted, and the temperature and humidity in the sealed heat preservation layer are kept within a set range; and the maintenance quality and strength development of the concrete in a low-temperature environment are effectively ensured.

Description

Technical Field

[0001] The invention relates to the technical field of concrete curing, in particular to a concrete curing construction method in a low temperature environment. Background Art

[0002] Concrete needs to maintain appropriate temperature and humidity during the curing process to ensure the smooth progress of the hydration reaction. However, when the outside temperature is low, the hydration reaction rate will be greatly slowed down, and the strength of the concrete will not be fully developed. In addition, water is easy to evaporate in a low temperature environment, causing problems such as cracking on the concrete surface. In order to ensure the strength and durability of concrete under low temperature conditions, effective maintenance measures must be taken to control the temperature and humidity environment in the maintenance space, so as to ensure the quality of concrete and meet the safety and durability requirements of construction.

[0003] In the prior art, concrete curing in low-temperature environments is usually carried out by combining physical covering and artificial heating. For example, concrete is wrapped with covering materials such as thermal blankets and plastic films to reduce heat loss, while electric blankets or cable heating devices are laid on its surface to provide an external heat source to increase the temperature. Some solutions also use humidification equipment to maintain a certain humidity in the covering layer to prevent the surface from losing water too quickly. These methods can improve the temperature and humidity of the curing environment to a certain extent and reduce the adverse effects of low temperature on concrete curing.

[0004] However, traditional curing methods have many shortcomings, especially in terms of the accuracy and stability of temperature and humidity control. Manual adjustment and heating methods cannot accurately maintain appropriate temperature and humidity, and local temperature differences and uneven humidity are prone to occur. In addition, excessive fluctuations in temperature and humidity are prone to occur, and a stable curing environment cannot be maintained for a long time. Therefore, the curing effect of concrete under low temperature conditions is not ideal, affecting the final structural strength and quality. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a concrete curing construction method in a low-temperature environment, which solves the problems in the prior art that manual adjustment and heating are prone to local temperature differences and uneven humidity, excessive fluctuations in temperature and humidity, and an inability to maintain a stable curing environment for a long time, thereby affecting the final structural strength and quality.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: A concrete curing construction method under a low temperature environment comprises the following steps:

[0007] S1. Arrange a support frame above the concrete surface so that the support frame spans the concrete but does not contact the concrete surface;

[0008] S2. Arrange a temperature and humidity sensor on the support frame, and install a heating system and a humidification system to adjust the temperature and humidity of the maintenance space in the support frame;

[0009] S3, covering the support frame and installing a multi-layer sealing insulation layer on it, the sealing insulation layer includes: a bottom sealing film close to the support frame, used to form a closed maintenance space and prevent water loss; an intermediate insulation layer outside the bottom sealing film, used to isolate the low temperature outside; an outer protective layer arranged outside the intermediate insulation layer, used to prevent wind and water;

[0010] S4. Receive temperature and humidity data through the Internet of Things control system, and adjust the operating status of the heating system and the humidification system to keep the temperature and humidity in the sealed insulation layer within the set range.

[0011] Preferably, in S1, the area of ​​the sealing and heat-insulating layer is larger than the area of ​​the supporting frame, and the material and connection method of the sealing and heat-insulating layer include:

[0012] The bottom sealing film is set as a high-density plastic film;

[0013] The intermediate thermal insulation layer is provided as aerogel composite cotton;

[0014] The outer protective layer is set as a PVC film;

[0015] Three-layer fixing method: the bottom sealing film, the middle insulation layer and the outer protective layer are bonded by an adhesive, and the adhesive is set to be a chloroprene rubber-based adhesive.

[0016] Preferably, the temperature and humidity sensor system and data monitoring and control system include the following steps:

[0017] Arrangement of temperature and humidity sensors: Arrange multiple temperature and humidity sensors in the curing space within the support frame, where the temperature sensors are arranged at different positions on the concrete surface and the internal space of the support frame, and the humidity sensors are arranged at different heights in the sealing insulation layer to obtain the distribution data of temperature and humidity in the curing space;

[0018] Data transmission and wireless transmission module: The temperature and humidity sensor is connected to the Internet of Things control system through a wireless data transmission module. The wireless data transmission module uses a low-power wireless communication protocol to transmit stable data in a low-temperature environment and uploads real-time temperature and humidity data to the Internet of Things control system;

[0019] Data analysis: The IoT control system receives the temperature and humidity data transmitted by the sensor, analyzes the temperature and humidity change trends in real time through the data monitoring algorithm, and sets the upper and lower limits of temperature and humidity;

[0020] Automatic control: The IoT control system automatically adjusts the operating status of the heating system and humidification system according to real-time data, including:

[0021] When the temperature is lower than the set lower limit, the heating system will automatically start and enter the heating mode;

[0022] When the humidity is lower than the set lower limit, the humidification system is started and enters the humidification mode;

[0023] When the temperature and humidity return to the set range, the system enters the maintenance mode and turns off the alarm.

[0024] Preferably, the heating system comprises a far infrared heater mounted on the support frame to uniformly heat the air in the sealed insulation layer.

[0025] Preferably, the Internet of Things control system controls the operating state of the heating system through a control algorithm, automatically starts heating when the temperature is lower than a set lower limit, and enters a maintenance mode when the temperature reaches an upper limit.

[0026] Preferably, the control algorithm includes a temperature setting range control formula:

[0027] T min ≤T≤T max

[0028] Where T is the current temperature, T min and T max are respectively the lower and upper limits of the temperature in the sealing and heat-insulating layer.

[0029] Preferably, the humidification system includes a water spraying device installed on a supporting frame, and the humidity data is monitored by an Internet of Things control system to automatically turn on the humidifier when the humidity is lower than a set range.

[0030] Preferably, the setting range of the humidity control satisfies the following formula:

[0031] H min ≤H≤H max

[0032] Where H is the current humidity, H min and H max are the lower and upper humidity limits respectively.

[0033] Preferably, in the data monitoring and control system, when the temperature or humidity data exceeds the set range after data analysis, the system sends out an alarm signal;

[0034] In addition, the Internet of Things control system supports remote monitoring function, and construction management personnel can view temperature and humidity data in real time through mobile terminals and manually adjust temperature and humidity control parameters.

[0035] Preferably, the Internet of Things control system also includes data recording, curve generation and report generation, and the steps are:

[0036] Data collection and recording: During the concrete curing period, the temperature and humidity sensors collect temperature and humidity data at set intervals and upload the data to the Internet of Things control system through the wireless data transmission module. The system continuously records the received data and stores it in the central database;

[0037] Data processing and calculation model: The Internet of Things control system uses an autoregressive integral moving average model to process and analyze the collected temperature and humidity data:

[0038] Data fitting: The AR IMA model is used to fit the temperature and humidity data to generate a continuous curve of temperature and humidity changes to reflect the actual fluctuation trend of temperature and humidity during the maintenance process;

[0039] Trend prediction: Based on the fitting curve, the system uses the AR IMA model to predict the trend of temperature and humidity in the future, generate a prediction curve, and provide data support for adjusting the heating and humidification equipment;

[0040] Curve generation: The system generates a temperature and humidity change curve based on the fitting and prediction results, including the actual measurement curve and the prediction curve, to visually display the changes in temperature and humidity during the maintenance period;

[0041] Report generation: The system automatically generates a maintenance report that includes temperature and humidity change curves, equipment start and stop records, abnormal alarm records, and environmental conditions during maintenance.

[0042] The present invention provides a concrete curing construction method in a low temperature environment. It has the following beneficial effects:

[0043] 1. The present invention sets a support frame above the concrete surface and arranges temperature and humidity sensors, a heating system and a humidification system to form a closed curing space with a multi-layer sealed insulation structure. The Internet of Things system is combined to monitor temperature and humidity data, and the heating and humidification equipment is automatically adjusted to maintain the temperature and humidity in the sealed insulation layer within the set range, thereby effectively ensuring the curing quality and strength development of concrete in a low temperature environment.

[0044] 2. The present invention receives and analyzes temperature and humidity data through the Internet of Things control system. The system can issue an alarm when the data exceeds the set range and adjust the status of the heating and humidification equipment according to the real-time data. In addition, the Internet of Things system supports remote monitoring, and construction management personnel can view temperature and humidity data in real time through mobile terminals, which improves the management efficiency and precise control of concrete maintenance.

[0045] 3. The present invention uses the ARIMA model to perform data fitting and trend prediction on the collected temperature and humidity data to generate a temperature and humidity change curve. By automatically recording temperature and humidity data, equipment start and stop conditions, abnormal alarms and other information, and generating a maintenance report containing these contents, it provides a reliable traceability basis for subsequent quality acceptance and data analysis, and optimizes the prediction and setting of subsequent maintenance conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 The present invention is a flow chart of the method. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Please see attached Figure 1 , an embodiment of the present invention provides a concrete curing construction method under a low temperature environment, comprising the following steps: S1, setting a support frame above the concrete surface so that the support frame spans the concrete but does not touch the concrete surface; S2, arranging temperature and humidity sensors on the support frame, and installing a heating system and a humidification system to adjust the temperature and humidity of the curing space in the support frame; S3, covering the support frame and installing a multi-layer sealing insulation layer on it, the sealing insulation layer comprising: a bottom sealing film close to the support frame, used to form a closed curing space and prevent water loss; an intermediate insulation layer outside the bottom sealing film, used to isolate the external low temperature; an outer protective layer arranged outside the intermediate insulation layer, used to prevent wind and water; S4, receiving temperature and humidity data through an Internet of Things control system, and adjusting the operating status of the heating system and the humidification system to keep the temperature and humidity in the sealing insulation layer within a set range.

[0049] In the present invention, a support frame is set above the concrete surface, and the temperature and humidity sensor, the heating system and the humidification system are arranged in the concrete curing space, and a multi-layer sealed insulation structure is used to form a closed space, so as to provide a suitable temperature and humidity environment for the concrete under a low temperature environment. The entire system relies on the Internet of Things control system to receive temperature and humidity data in real time and perform intelligent management. The operation of the heating and humidification system is regulated by preset upper and lower limits to ensure that the temperature and humidity in the sealed insulation layer are stable within the optimal range, which effectively supports the curing and strength improvement of the concrete. The temperature and humidity sensor is set as a multifunctional temperature and humidity sensor, model: DHT22 (AM2302). The DHT22 (AM2302) model multifunctional temperature and humidity sensor is suitable for a temperature range of -40°C to +80°C, with a humidity accuracy of ±2%RH and a temperature accuracy of ±0.5°C. It can provide synchronous measurement of temperature and humidity, is suitable for use in an environment with low temperature and large humidity changes, and outputs in the form of digital signals, which is convenient for integration with a wireless transmission module and an Internet of Things system to ensure the reliability of data acquisition and transmission.

[0050] In S1, the area of ​​the sealing insulation layer is larger than the area of ​​the supporting frame, and the material and connection method of the sealing insulation layer include: the bottom sealing film is set as a high-density plastic film; the middle insulation layer is set as aerogel composite cotton; the outer protective layer is set as a PVC film; three-layer fixing method: the bottom sealing film, the middle insulation layer and the outer protective layer are bonded by an adhesive, and the adhesive is set as a chloroprene rubber-based adhesive.

[0051] In the present invention, the area of ​​the sealing insulation layer is larger than the area of ​​the supporting frame, so that the edge of the entire maintenance space can be completely covered and sealed, further improving the sealing effect, effectively blocking the entry of external low-temperature air and preventing internal heat loss. The sealing insulation layer adopts a three-layer structure to meet the insulation and protection needs at different levels. First, the bottom sealing film adopts a high-density plastic film. Its high density and low permeability characteristics enable it to provide good waterproofness and barrier properties under the condition of contact with air, effectively preventing the loss of internal moisture, and maintaining elasticity and not easy to break in low-temperature environments; secondly, the middle insulation layer uses aerogel composite cotton. This material has excellent thermal insulation performance and lightweight structure. Its excellent thermal conductivity coefficient enables it to effectively isolate the external low temperature and provide continuous insulation effect for the maintenance space under extreme climatic conditions; the outer protective layer uses PVC film, which has good weather resistance and tear resistance, and can provide solid protection in harsh environments such as wind and rain, preventing the sealing insulation layer from external physical damage. In order to ensure a solid connection between the three layers of materials, each layer of material is bonded with a chloroprene rubber-based adhesive, which not only has strong bonding strength, but also has low-temperature resistance, and can maintain bonding stability and durability under low-temperature conditions, so that the entire sealing and thermal insulation layer can still maintain complete structure and sealing effect in a low-temperature environment. Therefore, the sealing and thermal insulation layer has multiple functions of weather resistance, heat preservation, waterproofing and damage resistance, providing a reliable guarantee for the maintenance of concrete in a low-temperature environment.

[0052] The temperature and humidity sensor system and data monitoring and control system include the following steps:

[0053] Arrangement of temperature and humidity sensors: Arrange multiple temperature and humidity sensors in the curing space within the support frame, where the temperature sensors are arranged at different positions on the concrete surface and the internal space of the support frame, and the humidity sensors are arranged at different heights in the sealing insulation layer to obtain the distribution data of temperature and humidity in the curing space;

[0054] Data transmission and wireless transmission module: The temperature and humidity sensor is connected to the Internet of Things control system through the wireless data transmission module. The wireless data transmission module uses a low-power wireless communication protocol to transmit stable data in a low-temperature environment and uploads real-time temperature and humidity data to the Internet of Things control system;

[0055] Data analysis: The IoT control system receives the temperature and humidity data transmitted by the sensor, analyzes the temperature and humidity change trends in real time through the data monitoring algorithm, and sets the upper and lower limits of temperature and humidity;

[0056] Automatic control: The Internet of Things control system automatically adjusts the operating status of the heating system and the humidification system according to real-time data, including: when the temperature is lower than the set lower limit, the heating system is automatically turned on and the heating system enters the heating mode; when the humidity is lower than the set lower limit, the humidification system is started and the humidification system enters the humidification mode; when the temperature and humidity return to the set range, the system enters the maintenance mode and turns off the alarm.

[0057] In the present invention, in the design of the temperature and humidity sensor system and the data monitoring and control system, firstly, a plurality of temperature and humidity sensors are precisely arranged in the maintenance space within the support frame to realize comprehensive monitoring of temperature and humidity. The temperature sensors are distributed at different positions on the concrete surface and inside the support frame, so that the system can obtain multi-point temperature data on the concrete surface and in the support frame space, thereby more accurately capturing the temperature distribution. In addition, the humidity sensors are arranged at different heights of the sealing and insulation layer. Such an arrangement helps to obtain humidity distribution data in the vertical direction, so as to better grasp the humidity gradient in the entire maintenance space. Therefore, not only the accurate collection of temperature and humidity data is ensured, but also the system can analyze the changing characteristics of temperature and humidity at different positions in the space, thereby optimizing the control strategy for heating and humidification, and realizing refined management of the maintenance environment;

[0058] In terms of data transmission, the temperature and humidity sensors are connected to the IoT control system through a wireless data transmission module. Considering the high requirements of low-temperature environments on signal transmission stability and transmission energy consumption, a low-power wireless communication protocol is selected to ensure stable and continuous transmission of temperature and humidity data in low-temperature environments. The real-time collected data will be uploaded directly to the IoT control system, so it can respond quickly to changes in temperature and humidity, so as to conduct a comprehensive analysis of the temperature and humidity distribution data collected by the sensor. During the data analysis process, the IoT control system uses a data monitoring algorithm to analyze the temperature and humidity change trends in real time, and sets the upper and lower limits of temperature and humidity based on the analysis results to ensure that the system can effectively regulate the heating and humidification equipment according to actual conditions;

[0059] After receiving the temperature and humidity data, the IoT control system will automatically adjust the operating status of the heating system and the humidification system based on the real-time data. For example, when the temperature is lower than the set lower limit, the heating system will automatically start and enter the heating mode, thereby gradually increasing the temperature of the maintenance space until it returns to an appropriate range. Similarly, when the humidity is lower than the set lower limit, the humidification system will automatically start and enter the humidification mode to increase the humidity in the space. After the heating and humidification adjustments, when the temperature and humidity return to the preset range, the system automatically enters the maintenance mode, stops adjusting and turns off the alarm signal, thereby ensuring the stability of the maintenance environment.

[0060] The heating system includes a far-infrared heater mounted on a support frame to evenly heat the air in the sealed insulation layer. The IoT control system controls the operating state of the heating system through a control algorithm, automatically starting heating when the temperature is below the set lower limit, and entering maintenance mode when the temperature reaches the upper limit. The control algorithm includes the temperature setting range control formula:

[0061] T min ≤T≤T max

[0062] Where T is the current temperature, T min and T max They are respectively the lower and upper limits of the temperature inside the sealed insulation layer.

[0063] The humidification system includes a water spray device mounted on a support frame, which monitors humidity data through an IoT control system to automatically turn on the humidifier when the humidity is below a set range. The setting range of humidity control satisfies the following formula:

[0064] H min ≤H≤H max

[0065] Where H is the current humidity, H min and H max are the lower and upper humidity limits respectively.

[0066] In the data monitoring and control system, when the temperature or humidity data exceeds the set range after data analysis, the system will send out an alarm signal; and the Internet of Things control system supports remote monitoring function. Construction management personnel can view temperature and humidity data in real time through mobile terminals and manually adjust temperature and humidity control parameters.

[0067] In the present invention, the heating system uses a far-infrared heater and is installed in a supporting frame to ensure that the air in the entire sealed insulation layer can be evenly heated. Since the far-infrared heater utilizes the penetrating property of far-infrared radiation, it can quickly heat a larger area of ​​space, making the heating effect more efficient and uniform. The Internet of Things control system accurately controls the operating state of the heating system through a control algorithm to achieve automatic regulation. When it is detected that the temperature in the maintenance space is lower than the set lower limit, the control system will immediately start the heating system, put the heater into a heating mode, and gradually increase the temperature to reach the set appropriate range. When the temperature returns to the set upper limit, the system automatically adjusts to the maintenance mode, maintains the appropriate temperature without heating, thereby avoiding temperature fluctuations and energy waste, and ensuring the stability and efficiency of the curing process. The far-infrared heater is set to the Phelps FHW-15K industrial-grade far-infrared heater. The power of this far-infrared heater is 15kW, which is suitable for larger curing areas and can effectively increase the temperature of the curing space in a short time. Heating range: This model is suitable for areas of 30-50 square meters, and can evenly cover the air in the curing space to ensure uniform heat distribution. Temperature control function: Built-in automatic temperature control system, which can be connected to the Internet of Things control system to achieve precise control of the upper and lower limits of temperature, and automatically start or stop heating. Low temperature resistance: The equipment is designed to maintain normal operation in an environment as low as -20°C, which is suitable for concrete curing needs in extremely cold environments, and is equipped with wall-mounted and bracket-type installation methods, which are convenient for installation according to the support frame layout requirements and have strong flexibility.

[0068] The humidification system uses a water spray device to adjust the humidity in the curing space to ensure that the concrete surface always maintains sufficient moisture under low temperature conditions. The water spray device is arranged above the support frame, and the humidity is increased by precise water spray control to avoid condensation caused by excessive humidification. The Internet of Things control system monitors the humidity data in real time. When the humidity is detected to be lower than the lower limit of the set range, the system will automatically activate the humidifier to gradually increase the humidity of the curing space to an appropriate level. The humidity range set by the system is precisely regulated to ensure that the humidity is stable in the optimal range. Once the humidity reaches the upper limit, the system will automatically enter the maintenance state, stop spraying water and maintain the set humidity level. It effectively avoids the problem of insufficient hydration of concrete due to too low humidity, and prevents unnecessary moisture accumulation caused by too high humidity, ensuring the stability and high quality of the curing environment.

[0069] The IoT control system also includes data recording, curve generation and report generation. The steps are:

[0070] Data collection and recording: During the concrete curing period, the temperature and humidity sensors collect temperature and humidity data at set intervals and upload the data to the Internet of Things control system through the wireless data transmission module. The system continuously records the received data and stores it in the central database;

[0071] Data processing and calculation model: The Internet of Things control system uses an autoregressive integral moving average model to process and analyze the collected temperature and humidity data:

[0072] Data fitting: Use the ARIMA model to fit the temperature and humidity data to generate a continuous curve of temperature and humidity changes to reflect the actual fluctuation trend of temperature and humidity during the maintenance process;

[0073] Trend prediction: Based on the fitting curve, the system uses the ARIMA model to predict the trend of temperature and humidity in the future, generate a prediction curve, and provide data support for adjusting the heating and humidification equipment;

[0074] Curve generation: The system generates a temperature and humidity change curve based on the fitting and prediction results, including the actual measurement curve and the prediction curve, to visually display the changes in temperature and humidity during the maintenance period;

[0075] Report generation: The system automatically generates a maintenance report that includes temperature and humidity change curves, equipment start and stop records, abnormal alarm records, and environmental conditions during maintenance.

[0076] In the present invention, the Internet of Things control system has comprehensive data recording, curve generation and report generation functions to ensure the monitoring of the maintenance process and data traceability. During the concrete curing period, the system first collects data regularly through the temperature and humidity sensors, usually automatically every set time (for example, 5 minutes or 15 minutes). The collected temperature and humidity data will be uploaded to the Internet of Things control system in real time through the wireless data transmission module. The system continuously records all received data and stores it in the central database to form a complete data record chain. Such a data collection and recording mechanism not only ensures the real-time nature of the data, but also provides an accurate data basis for subsequent data analysis and equipment control, avoiding errors caused by large data intervals. At the same time, the centrally stored data facilitates the retrieval and comparison of historical data, provides a reliable reference basis for construction management personnel and quality inspection, and makes the entire maintenance process more transparent and traceable;

[0077] In terms of data processing, the system uses the autoregressive integrated moving average model (ARIMA) to conduct in-depth analysis of the collected temperature and humidity data. Data processing is divided into multiple stages. The first is data fitting. The temperature and humidity data are fitted by the ARIMA model to generate a continuous temperature and humidity change curve, which accurately reflects the temperature and humidity fluctuations during the maintenance period. This fitting curve can effectively eliminate short-term fluctuations in the data and more clearly show the actual change trend of temperature and humidity. Based on the fitted data, the system further uses the ARIMA model to predict trends, predict the temperature and humidity changes in the future, and generate trend prediction curves, providing effective data support for the early adjustment of heating and humidification equipment. Finally, the system generates a temperature and humidity change curve chart based on the fitting and prediction results, including the actual measurement curve and the prediction curve, so that construction management personnel can intuitively observe the temperature and humidity changes during the maintenance period. The system also automatically generates a detailed maintenance report containing temperature and humidity change curves, equipment start and stop records, abnormal alarm records, and environmental conditions during maintenance, providing complete record support for construction quality acceptance and subsequent data analysis. Such data management and analysis functions not only optimize equipment control, but also improve the scientificity and management efficiency of the maintenance process.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concrete curing construction method in a low temperature environment, characterized in that: The following steps are involved: S1. Arrange a support frame above the concrete surface so that the support frame spans the concrete but does not contact the concrete surface; S2. Arrange a temperature and humidity sensor on the support frame, and install a heating system and a humidification system to adjust the temperature and humidity of the maintenance space in the support frame; S3, covering the support frame and installing a multi-layer sealing insulation layer on it, the sealing insulation layer includes: a bottom sealing film close to the support frame, used to form a closed maintenance space and prevent water loss; an intermediate insulation layer outside the bottom sealing film, used to isolate the low temperature outside; an outer protective layer arranged outside the intermediate insulation layer, used to prevent wind and water; S4. Receive temperature and humidity data through the Internet of Things control system, and adjust the operating status of the heating system and the humidification system to keep the temperature and humidity in the sealed insulation layer within the set range.

2. The method for concrete curing construction in a low temperature environment according to claim 1, characterized in that: In S1, the area of ​​the sealing and heat-insulating layer is larger than the area of ​​the supporting frame, and the material and connection method of the sealing and heat-insulating layer include: The bottom sealing film is set as a high-density plastic film; The intermediate thermal insulation layer is provided as aerogel composite cotton; The outer protective layer is set as a PVC film; Three-layer fixing method: the bottom sealing film, the middle insulation layer and the outer protective layer are bonded by an adhesive, and the adhesive is set to be a chloroprene rubber-based adhesive.

3. The method for concrete curing construction in a low temperature environment according to claim 1, characterized in that: The temperature and humidity sensor system and data monitoring and control system include the following steps: Arrangement of temperature and humidity sensors: Arrange multiple temperature and humidity sensors in the curing space within the support frame, where the temperature sensors are arranged at different positions on the concrete surface and the internal space of the support frame, and the humidity sensors are arranged at different heights in the sealing insulation layer to obtain the distribution data of temperature and humidity in the curing space; Data transmission and wireless transmission module: The temperature and humidity sensor is connected to the Internet of Things control system through a wireless data transmission module. The wireless data transmission module uses a low-power wireless communication protocol to transmit stable data in a low-temperature environment and uploads real-time temperature and humidity data to the Internet of Things control system; Data analysis: The IoT control system receives the temperature and humidity data transmitted by the sensor, analyzes the temperature and humidity change trends in real time through the data monitoring algorithm, and sets the upper and lower limits of temperature and humidity; Automatic control: The IoT control system automatically adjusts the operating status of the heating system and humidification system according to real-time data, including: When the temperature is lower than the set lower limit, the heating system will automatically start and enter the heating mode; When the humidity is lower than the set lower limit, the humidification system is started and enters the humidification mode; When the temperature and humidity return to the set range, the system enters the maintenance mode and turns off the alarm.

4. The method for concrete curing construction in a low temperature environment according to claim 3, characterized in that: The heating system includes a far infrared heater mounted on a supporting frame to uniformly heat the air in the sealed insulation layer.

5. The method for curing concrete in a low temperature environment according to claim 3, characterized in that: The Internet of Things control system controls the operating state of the heating system through a control algorithm, automatically starts heating when the temperature is lower than the set lower limit, and enters a maintenance mode when the temperature reaches the upper limit.

6. The method for curing concrete in a low temperature environment according to claim 5, characterized in that: The control algorithm includes the temperature setting range control formula: T min ≤T≤T max Where T is the current temperature, T min and T max are respectively the lower and upper limits of the temperature in the sealing and heat-insulating layer.

7. The method for curing concrete in a low temperature environment according to claim 5, characterized in that: The humidification system includes a water spraying device installed on a supporting frame, and the humidity data is monitored by an Internet of Things control system to automatically turn on the humidifier when the humidity is lower than a set range.

8. The method for curing concrete in a low temperature environment according to claim 7, characterized in that: The setting range of the humidity control satisfies the following formula: H min ≤H≤H max Where H is the current humidity, H min and H max are the lower and upper humidity limits respectively.

9. The method for curing concrete in a low temperature environment according to claim 7, characterized in that: In the data monitoring and control system, when the temperature or humidity data exceeds the set range after data analysis, the system sends out an alarm signal; In addition, the Internet of Things control system supports remote monitoring function, and construction management personnel can view temperature and humidity data in real time through mobile terminals and manually adjust temperature and humidity control parameters.

10. The method for curing concrete in a low temperature environment according to claim 9, characterized in that: The Internet of Things control system also includes data recording, curve generation and report generation, and the steps are: Data collection and recording: During the concrete curing period, the temperature and humidity sensors collect temperature and humidity data at set intervals and upload the data to the Internet of Things control system through the wireless data transmission module. The system continuously records the received data and stores it in the central database; Data processing and calculation model: The Internet of Things control system uses an autoregressive integral moving average model to process and analyze the collected temperature and humidity data: Data fitting: Use the ARIMA model to fit the temperature and humidity data to generate a continuous curve of temperature and humidity changes to reflect the actual fluctuation trend of temperature and humidity during the maintenance process; Trend prediction: Based on the fitting curve, the system uses the ARIMA model to predict the trend of temperature and humidity in the future, generate a prediction curve, and provide data support for adjusting the heating and humidification equipment; Curve generation: The system generates a temperature and humidity change curve based on the fitting and prediction results, including the actual measurement curve and the prediction curve, to visually display the changes in temperature and humidity during the maintenance period; Report generation: The system automatically generates a maintenance report that includes temperature and humidity change curves, equipment start and stop records, abnormal alarm records, and environmental conditions during maintenance.

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