Automatic cooling device for circulating cooling water of mass concrete

Abstract

The utility model discloses an automatic cooling device for circulating cooling water of mass concrete. The automatic cooling device comprises a circulating cooling water pipe arranged in the concrete, a water tank connected with the circulating cooling water pipe, temperature sensors uniformly distributed in the concrete, and a control cabinet electrically connected with the temperature sensors and the water tank. A cooling circulating water temperature control method is adopted to reduce the temperature rise of mass concrete, the water flow speed of a circulating water pipe is automatically adjusted according to the change rule of the temperature in the concrete measured by a thermocouple sensor in a temperature measuring point, the internal and external temperatures of the mass concrete are balanced, stress cracks caused by the concrete temperature difference are prevented, the engineering quality is ensured, and the construction flexibility is improved; the construction efficiency is improved, the quality and performance of the concrete are improved, and the problems of cracking and deformation caused by temperature difference in the hardening process of the concrete are reduced. The device can realize remote monitoring, monitors and adjusts the concrete temperature in real time through a sensor and data analysis, and improves the stability and reliability of the system.

Description

Technical Field

[0001] This application relates to the field of post-concrete curing technology for raft foundation concrete, and in particular to an automatic cooling device for circulating cooling water in large-volume concrete. Background Technology

[0002] Raft foundation concrete is used for pouring raft foundations. A raft foundation is a concrete slab with the ground beneath it and columns, walls, etc., on top. Raft foundation concrete needs to meet certain strength, workability, and durability requirements to ensure the stability and safety of the raft foundation. Cooling and curing is a crucial step after the raft foundation concrete has been poured and formed, aiming to eliminate the influence of temperature differences between the inside and outside of the concrete and prevent temperature cracks.

[0003] Because raft foundations (mass-concrete slabs) are characterized by their thick structure, large size, and high construction technical requirements, a significant amount of heat is generated during the construction process due to the heat of cement hydration. Heat dissipates quickly from the concrete surface, while internal heat is difficult to dissipate, resulting in a large temperature difference between the interior and surface. When this temperature difference exceeds a certain critical value, it causes temperature stress cracks in the concrete, thus affecting the durability of the project.

[0004] Currently, after large-volume concrete is poured and formed, its temperature is controlled through cooling circulating water to avoid stress cracking caused by excessive internal and external temperature differences. The cooling structure of the circulating water is as follows: Figure 1 As shown, this includes circulating cooling water pipes installed within the concrete (connected and fixed to the reinforcing steel bars within the concrete before pouring), and a water tank connected to these pipes. Currently, cooling measures must be managed by designated personnel who regularly test the surface and internal temperatures of the concrete on-site. Only when the temperature difference exceeds the specified requirements will the water pump be manually activated to inject cooling water. The inability to adjust the water pump's operation in real-time based on temperature changes may lead to excessive temperature differences, resulting in cracks and other defects in the project. Summary of the Invention

[0005] To address the aforementioned problems, this application aims to provide an automatic cooling device for circulating cooling water in large-volume concrete. This device employs a cooling water temperature control method to reduce the temperature rise of the large-volume concrete. By analyzing the temperature changes within the concrete measured by thermocouple sensors at the temperature measuring points, the device automatically adjusts the water flow rate in the circulating water pipes to balance the internal and external temperatures of the large-volume concrete, preventing stress cracks caused by temperature differences and ensuring project quality.

[0006] To achieve the above objectives, the technical solution adopted in this application is as follows: an automatic cooling device for circulating cooling water in large-volume concrete, comprising a circulating cooling water pipe installed in the concrete and a water tank connected to the circulating cooling water pipe, characterized in that: temperature sensors are evenly distributed in the concrete, and a control cabinet is electrically connected to the temperature sensors and the water tank.

[0007] Preferably, the circulating cooling water pipes are arranged in an arc-shaped plane within the concrete, and longitudinal connecting pipes are connected between adjacent sections of the circulating cooling water pipes.

[0008] Preferably, the cross-section of both the circulating cooling water pipe and the longitudinal conductive pipe is a vertical elliptical structure.

[0009] Preferably, positioning arc rings nested with the reinforcing bars in the concrete are also provided at intervals on the top side of the circulating cooling water pipe and the longitudinal guide pipe.

[0010] The beneficial effects of this application are: using cooling circulating water temperature control method to reduce the temperature rise of large-volume concrete, and automatically adjusting the water flow rate of the circulating water pipe by measuring the temperature change pattern of the concrete inside the temperature measuring point by the thermocouple sensor, balancing the internal and external temperatures of the large-volume concrete, preventing stress cracks caused by temperature difference in the concrete, and ensuring project quality.

[0011] This device saves energy and costs, increases construction flexibility, improves construction efficiency, enhances concrete quality and performance, and reduces cracking and deformation caused by temperature differences during the hardening process. The device enables remote monitoring, using sensors and data analysis to monitor and adjust concrete temperature in real time, thus improving system stability and reliability. Attached Figure Description

[0012] Figure 1 This is a diagram of a current raft foundation (concrete cooling structure).

[0013] Figure 2 This is a schematic diagram of the automatic cooling device and the raft plate connection structure of this application.

[0014] Figure 3 This is a plan view of the current circulating cooling water pipe structure.

[0015] Figure 4 This is a diagram illustrating the structure of a longitudinally connected pipe in the circulating cooling water pipe of this application.

[0016] Figure 5 A comparison diagram of the horizontal distance between the circulating cooling water pipe and the longitudinal conductive pipe with the circular pipe body, which are designed with a vertical elliptical structure for this application.

[0017] Figure 6 This is a diagram of the steel reinforcement structure within the raft foundation.

[0018] Figure 7 This diagram illustrates the connection between the circulating cooling water pipe and the longitudinal conductive pipe and the tied reinforcing steel bars in this application.

[0019] Figure 8This illustration shows the lateral and longitudinal displacement of the circulating cooling water pipes and longitudinal guide pipes and the tied reinforcing bars during the concrete pouring process, as described in this application.

[0020] Figure 9 This diagram illustrates the circumferential deflection of the circulating cooling water pipe and longitudinal guide pipe relative to the tied reinforcing bars during the concrete pouring process, as described in this application.

[0021] Figure 10 For the purpose of this application Figure 9 The diagram shows the breakage at the junction of the circulating cooling water pipe and the longitudinal conductive pipe caused by circumferential deflection.

[0022] Figure 11 This application includes a positioning arc ring and a usage status diagram.

[0023] Figure 12 This is a schematic diagram of the control system of an automatic cooling device.

[0024] In the diagram: 6-raft slab (concrete); 7-raft slab temperature sensor signal cable; 8-circulating pump power cable; 9-water tank temperature sensor signal cable; 10-overflow pipe; 11-solenoid valve; 12-ball valve; 13-atmospheric temperature sensor; 14-reinforcing steel bars. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solutions of this application, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] See attached document Figures 1-11 The illustrated automatic cooling device for large-volume concrete circulating cooling water includes a circulating cooling water pipe 1 (preferably a thin-walled iron pipe with an outer diameter of 50mm, with the pipes connected by matching joints to achieve circulating flow of cooling water within the iron pipe) installed within the concrete, and a water tank 2 connected to the circulating cooling water pipe 1 (also comprising a circulating water pump, which pumps water from the tank into the cooling water pipe to achieve cooling). Currently, the cooling measures must be managed by designated personnel who regularly test the surface and internal temperatures of the concrete on-site. Only when the temperature difference exceeds the specified requirements will the water pump be manually activated to inject cooling water for cooling.

[0027] To address the current inability to activate cooling water pumps in real time based on temperature changes, which could lead to excessive temperature differences and cracks, this application proposes uniformly distributed temperature sensors (preferably WZP-GZPT-A platinum resistance temperature sensors, not shown in the figure, installed together with the circulating cooling water pipe 1 before concrete pouring, and connected to the control cabinet 3 via wires) within the concrete. These sensors are positioned within temperature measurement points on the concrete (preferably six points, including temperature sensors at the edges, corners, and center of the concrete; each point has a temperature sensor embedded in the concrete at a depth of -50mm and -600mm below the surface of the concrete, respectively, and at a distance greater than 300mm from the circulating water pipe) to collect the temperature within the concrete.

[0028] It also includes a control cabinet 3 electrically connected to the temperature sensor and water tank 2. This control cabinet 3 is preferably a PLC control cabinet, comprising a central processing unit, input / output interfaces, etc., and has an alarm function for situations such as excessively rapid cooling or excessive temperature difference between the surface and interior. Based on the signal returned by the temperature sensor, it collects temperature change information, controls the start and stop of the circulating water pump, and controls the opening and closing of the water replenishment device for water tank 2. The water replenishment device, such as... Figure 2 As shown, the system consists of an inlet pipe, a ball valve, and a solenoid valve, which replenishes the cooling water in water tank 2. It also includes a temperature sensor installed in the middle of the water tank to test the temperature of the cooling water inside, and a temperature sensor installed in the concrete pouring area to test the atmospheric temperature.

[0029] The process of controlling the temperature difference of large-volume concrete is as follows: The temperature changes at different depths and the development patterns of temperature differences in the early and middle stages of construction are understood. The resistance change of the platinum resistance temperature sensor is measured using control cabinet 3. Data collected by temperature sensors in the raft slab (concrete) and water tank 2 are compared and analyzed. Calculations are performed to determine the changes in surface and internal temperature differences of the raft slab concrete, cooling rate, and other data. Deviations from the set values ​​are compared. When the deviation exceeds the set value, a control loop is formed with the automatic electronic magnetic signal control system of the multi-stage water pump, the solenoid valve of the water supply pipe, etc., thereby automatically starting the automatic cooling water circulation system.

[0030] Automatic temperature control can be implemented through the following steps:

[0031] 1) After the concrete is poured and the cooling water pipes and temperature sensors are covered (i.e., when the concrete begins to heat up), the temperature sensors inside the raft begin to collect information on the changes in concrete temperature. The pre-embedded temperature sensors 1 and 2 transmit the collected temperature information back to the automatic temperature control device via wired connection.

[0032] 2) During temperature monitoring, when the temperature difference between the concrete surface and the interior exceeds the set value of 25℃ by the temperature controller, the temperature control device will automatically alarm. The controller will intelligently and promptly start the circulating water pump in the water tank to inject the cooling water in the water tank into the circulating cooling water pipes in the raft, thereby achieving raft temperature control.

[0033] 3) Based on temperature information collected by temperature sensors, when the difference between the highest temperature of the concrete and the surface temperature is less than 15℃, the temperature control device sends a signal to pause the water supply and cooling operation of the circulating water pump. The circulating water pump will restart when the temperature difference between the surface and the interior exceeds the set value.

[0034] The cooling rate is controlled by the temperature control device, which records the daily cooling rate of the raft concrete by collecting the core temperature of the concrete through sensor 2. When the cooling rate is greater than 2.0℃ / d or the temperature drops more than 10℃ every 4 hours, the control system controls the circulating water pump to stop supplying water through an automatic electronic magnetic signal, thereby controlling the heating and cooling rate of the concrete to meet the specifications.

[0035] 4) Water tank replenishment control

[0036] Temperature sensors within the raft slab detect the temperature difference between the inlet water and the highest internal temperature of the concrete. If the water temperature in the cooling circulating water tank is lower than the set value at the center of the large-volume concrete, the controller will open the ball valve on the water supply pipe to replenish the cooling water in the tank. This regulates the temperature of the cooling water entering the circulating cooling pipe until it effectively lowers the concrete temperature. An overflow pipe must be installed in the cooling circulating water tank to discharge high-temperature water.

[0037] Building upon the aforementioned automated temperature control of concrete, to further improve cooling efficiency and reduce energy consumption, such as... Figure 1-3 As shown, the circulating cooling water pipe 1 is arranged in a bow-shaped plane within the concrete, with a single layer vertically. The cooling pipe is positioned in the middle of the concrete, 600mm from the bottom. The bow-shaped plane arrangement allows for water inlet and outlet, while also ensuring uniform distribution within the concrete, thus improving the cooling effect.

[0038] To further enhance the cooling effect of circulating cooling water pipe 1, such as Figure 4 As shown, in the adjacent sections of the circulating cooling water pipe 1 (such as...) Figure 4 The parallel pipes shown are all connected by a longitudinal guide pipe 4. This longitudinal guide pipe 4 is connected to the circulating cooling water pipe 1. Based on the water circulation, it can effectively increase the cooling area of ​​the circulating cooling water pipe 1 (by utilizing the circulating cooling water pipe 1 and the longitudinal guide pipe 4 to absorb the heat in the concrete), thereby accelerating the temperature drop of the concrete and reducing the energy consumption of the automatic control device.

[0039] Because the circulating cooling water pipe 1 and the longitudinal guide pipe 4 are arranged in a planar manner within the concrete, the concrete pouring surface encroached upon by the circulating cooling water pipe 1 and the longitudinal guide pipe 4 within this horizontal plane is too large. This means the amount of concrete poured in this plane is reduced, which will affect the overall strength of the concrete. Therefore, to solve this problem, such as... Figure 5 As shown, the cross-sections of both the circulating cooling water pipe 1 and the longitudinal conductive pipe 4 are vertically elliptical. By setting the circulating cooling water pipe 1 and the longitudinal conductive pipe 4 to a vertical elliptical structure, the impact on the amount of concrete poured is reduced within the plane in which the circulating cooling water pipe 1 and the longitudinal conductive pipe 4 are arranged, while maintaining the cooling area of ​​the pipe body. Simultaneously, the increased vertical height of the circulating cooling water pipe 1 and the longitudinal conductive pipe 4 enhances the cooling effect on the concrete portions above and below the pipe body's arrangement plane, thus accelerating the temperature drop of the concrete and reducing the energy consumption of automatic control.

[0040] Furthermore, the longitudinal guide pipe 4 can be set as a U-shaped structure to better avoid the impact on the amount of concrete poured in the current horizontal plane caused by it being in the same plane as the circulating cooling water pipe 1. At the same time, after the longitudinal guide pipe 4 and the circulating cooling water pipe 1 have a vertical height difference, the cooling effect on the concrete parts above and below the circulating cooling water pipe 1 is further enhanced.

[0041] Since the circulating cooling water pipe 1 and the longitudinal guide pipe 4 are tied to the reinforcing steel bars before the concrete is poured, such as Figure 6-7 As shown, the binding is usually done with thin iron wire. During the concrete pouring process, the flow of concrete and the force of vibration are transmitted to the circulating cooling water pipe 1 and the longitudinal guide pipe 4, as... Figure 8 As shown, this will cause the circulating cooling water pipe 1 and the longitudinal conductive pipe 4 to shift laterally and longitudinally relative to the tied reinforcing bars, as well as to deflect circumferentially (e.g. Figure 9 As shown), this will affect the sealing performance at the corner of the circulating cooling water pipe 1 and at the connection with the longitudinal guide pipe 4 (as shown). Figure 10 (as shown), therefore, to solve this problem, such as Figure 11 As shown, positioning arc rings 5, nested with reinforcing bars within the concrete, are also provided at intervals on the top sides of the circulating cooling water pipe 1 and the longitudinal conductive pipe 4. Figure 11 As shown, by nesting the positioning arc ring 5 on the bottom surface of the tied steel bar and then tying it again with thin steel bars, the lateral and longitudinal positioning of the circulating cooling water pipe 1 and the longitudinal guide pipe 4 can be achieved. This can resist the longitudinal and lateral displacement between the pipe and the tied steel bar during the concrete pouring process, as well as the circumferential deflection relative to the tied steel bar, thereby avoiding the sealing problem between the circulating cooling water pipe 1 and the longitudinal guide pipe 4.

[0042] The principle of this application is as follows: Before concrete pouring, the circulating cooling water pipe 1 and the longitudinal guide pipe 4 are fixed to the horizontal and longitudinal reinforcing bars by positioning arc rings 5. Then, a large volume of concrete is poured and formed. After forming, the temperature inside the concrete is measured by the control cabinet 3, and the water tank 2 is controlled to circulate the water source in the circulating cooling water pipe 1 and the longitudinal guide pipe 4, thereby realizing the self-controlled cooling operation of the concrete.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this application. Various changes and modifications may be made to this application without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims.

Claims

1. A mass concrete circulating cooling water automatic cooling device, comprising a circulating cooling water pipe (1) arranged in concrete, and a water tank (2) connected with the circulating cooling water pipe (1), characterized in that: Temperature sensors are evenly arranged in the concrete, and a control cabinet (3) is electrically connected with the temperature sensors and the water tank (2).

2. The automatic cooling device according to claim 1, characterized in that: The circulating cooling water pipes (1) are arranged in an arch-shaped plane in the concrete, and longitudinal through pipes (4) are arranged between the pipe sections of the adjacent circulating cooling water pipes (1).

3. The automatic cooling device according to claim 2, characterized in that: The pipe sections of the circulating cooling water pipes (1) and the longitudinal through pipes (4) are all vertical elliptical structures.

4. The automatic cooling device according to claim 3, characterized in that: Positioning circular arc rings (5) are arranged at intervals on the top sides of the circulating cooling water pipes (1) and the longitudinal through pipes (4) and are nested with the bundled steel bars in the concrete.

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