Intelligent water supply control method and system for mass concrete temperature rise stage

Abstract

The invention provides an intelligent water supply control method and system for a mass concrete temperature rise stage, the mass concrete adopts a double-loop circulating water cooling system, return water of a first water loop returns to a water tank, return water of a second water loop is connected to a cooling pond, a water inlet pump is arranged in the cooling pond, and a water outlet pump is arranged in the cooling pond. A water level sensor and a temperature sensor are arranged in the water tank, through reasonable logic design, automatic control over the water pump is achieved, intelligent water passing control in the concrete temperature rising stage is achieved, and the working efficiency of water passing cooling is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of concrete construction, and in particular to an intelligent water flow control method and system for large-volume concrete in a heating stage. Background Art

[0002] During the pouring process of large-volume concrete, a large amount of heat will be generated due to the hydration reaction of the internal cement. Since concrete is a poor conductor of heat, the heat cannot be dissipated in time, resulting in a distribution of high temperature inside the concrete and low temperature outside. Due to the existence of internal and external temperature difference, the concrete will produce certain temperature stress. Once it exceeds the allowable value of the concrete, it will cause temperature cracks in the concrete.

[0003] Cooling concrete through water pipes is an effective means of controlling the temperature rise inside the concrete. Considering the on-site layout conditions, a circulating water system is generally adopted, that is, a circulating water tank is laid out, and the cooling water pipe takes water from the water tank. After the temperature inside the concrete rises, it returns to the water tank. During the concrete heating stage, the water in the water tank is heated internally in the concrete, and its return water temperature is relatively high. If it is directly returned to the water tank, the water temperature in the water tank will rise, affecting the cooling effect of the concrete. The existing method of treating the water tank often requires a refrigerator or cooling device, which has a limited cooling effect and consumes a lot of energy. Summary of the Invention

[0004] In view of the problems of the prior art, the present invention provides a method and system for intelligent water flow control during the temperature rise stage of large-volume concrete.

[0005] The present invention provides an intelligent water flow control method for a mass concrete heating stage. The mass concrete is temperature-controlled by water flow. The control method is used for controlling the water temperature of a water tank during the heating stage of the concrete. The method is characterized in that a water flow system includes a water tank, a first water circuit, a second water circuit, and a cooling pool. The first water circuit and the second water circuit both take in water through the water tank and are arranged in the concrete. The water outlet of the first water circuit is connected to the water tank, and the water outlet of the second water circuit is connected to the cooling pool. The cooling pool is connected to the water tank via a water inlet pump and a water inlet pipe. A water level sensor and a temperature sensor are provided in the water tank for obtaining the water level H and temperature T of the water tank. The control method comprises the following steps: S1: When the water level H is less than or equal to the minimum set water level Hmin, the water inlet pump is controlled to start, and the water in the cooling pool enters the water tank; S2: When the water level H is greater than or equal to the maximum set water level Hmax, the water inlet pump is controlled to be turned off; S3: When the water level H is between Hmin and Hmax, and when the temperature T is less than or equal to the set temperature Tx, the water inlet pump is controlled to be turned off; when the temperature T is greater than the set temperature Tx, the water inlet pump is controlled to be turned on.

[0006] Preferably, the set temperature Tx is greater than the water temperature in the cooling pool and less than the temperature of the first water circuit outlet.

[0007] Preferably, an intermediate water level Hp is set. When the temperature T is greater than Tx and the water level H is greater than or equal to Hp, the water inlet pump is turned on and the refrigeration device is started at the same time. The refrigeration device is connected to the water tank. When the temperature T is greater than Tx and the water level H is less than Hp, only the water inlet pump is turned on.

[0008] The present invention also provides a system that applies the above-mentioned intelligent water flow control method for the temperature rise stage of large-volume concrete. The system includes a temperature sensor, a water level sensor and a control module arranged in a water tank. The control module is connected to an input module and a drive module. The input module is used to input the minimum set water level Hmin, the maximum set water level Hmax and the set temperature Tx. The drive module is used to drive the water inlet pump to turn on or off. The control module is used to obtain data input by the input module and, according to the above-mentioned intelligent water flow control method for the temperature rise stage of large-volume concrete, drive the water inlet pump to turn on or off through the drive module.

[0009] Preferably, the control module is a single chip microcomputer, and the driving module is a relay.

[0010] The working principle of the present invention is as follows: For large-volume concrete pouring construction, for a period of time after the concrete pouring is completed, the heat generated by the hydration reaction is far greater than the heat dissipation rate, and the concrete enters the heating stage. The heating stage is also the core time stage of concrete temperature control. At this time, the return water temperature of the water pipe that has heated up inside the concrete is relatively high, and can even reach 30~40℃. If it is not effectively controlled and the return water is allowed to return directly to the water tank, the water temperature in the water tank will increase. Some existing control measures also have methods of increasing the injection of cold water and chiller control, but they do not essentially solve the problem of heat return. If part of the heat is no longer returned to the water tank during the heating stage, the heat accumulation in the water tank will be greatly reduced, which will help to reduce the water temperature in the water tank.

[0011] Based on this principle, two water circuits are arranged so that one of the water circuits does not return to the water tank, which greatly reduces the return and accumulation of heat in the water tank. At the same time, for the water circuit that does not return to the water tank, a cooling pool is set up for natural cooling or artificial cooling. The capacity of the cooling pool is much larger than the capacity of the water tank, preferably more than 10 times the capacity of the water tank. Since the specific heat capacity of the water body is small, the original water body of the cooling pool can be fully utilized to cool and neutralize the return water temperature of the water circuit. Water is pumped by the water inlet pump so that the cooled water in the cooling pool returns to the water tank, thereby reducing the water temperature of the water tank.

[0012] A water level sensor and a temperature sensor are set in the water tank to monitor the water temperature and water level in the water tank in real time. Once the water level triggers the upper and lower limits, the water inlet pump is regulated. When the water inlet pump is not working, the water level in the water tank will drop. To ensure the normal operation of the system, the water inlet rate of the water inlet pump should be greater than the water outlet rate of the second water circuit to ensure that the water level in the water tank can rise when the water inlet pump is working.

[0013] Set the upper and lower water level limits to ensure that the water level in the water tank is within a reasonable operating range and to ensure sufficient circulating water volume. At the same time, set the set temperature. This temperature should be lower than the return water temperature of the first water circuit and higher than the water temperature in the cooling pool (if the setting is unreasonable, it may cause frequent operation or the set temperature may not be reached). For the set temperature, you can set it based on experience, or you can choose to subtract the recommended value from the temperature of the center point inside the concrete. The recommended value can be 20~25℃.

[0014] The method and system are mainly used in the temperature rising stage, especially the stage when the outlet temperature of the concrete cooling water pipe rises rapidly, and can effectively reduce the water temperature of the water tank, thereby ensuring that the water temperature entering the concrete is appropriate.

[0015] The advantages of the present invention are: (1) Setting up a double-circuit water cooling system can improve the effective control of concrete temperature; (2) By setting up a cooling pool, the outlet water of the second water circuit is connected to the cooling pool, reducing the entry of hot water into the water tank. At the same time, the cooling of the water in the cooling pool is used to form a cold water source, and the water is pumped to the water tank by the water inlet pump to achieve the cooling of the water tank water temperature; (3) Install a water level sensor and a temperature sensor in the water tank to achieve reasonable control of the water level and water temperature in the water tank, avoid too little or too much water in the water tank, ensure a reasonable amount of water flow, and use water temperature control to ensure that the water temperature is within the preset range; (4) Add a refrigeration device to ensure that the water temperature cannot be effectively reduced even when the water level exceeds the maximum set water level during the rapid temperature rise stage.

[0016] (5) Use the automatic control system to achieve automatic optimization control and improve the efficiency of concrete temperature control. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a flow chart of the control method of the present invention; Figure 2 This is a flow chart of a control method according to an embodiment of the present invention; Figure 3 Schematic diagram of the system connection of the present invention.

[0017] Specific implementation method: The following is a detailed explanation of the content defined in the present invention.

[0018] The application provides a large-volume concrete heating stage intelligent water passing control method, which is used for temperature control of large-volume concrete by water passing, and is used for water tank water temperature control in a concrete heating stage, and is characterized in that: a water passing system comprises a water tank, a first water circuit, a second water circuit and a cooling pool, the first water circuit and the second water circuit both pass into the water tank and are arranged in concrete, a water outlet of the first water circuit is connected with the water tank, a water outlet of the second water circuit is connected with the cooling pool, the cooling pool is connected with the water tank through a water inlet pump 6 and a water inlet pipe, a water level sensor 2 and a temperature sensor 1 are arranged in the water tank and are used for acquiring a water level H and a temperature T of the water tank, and the control method comprises the following steps: S1: when the water level H is less than or equal to a lowest set water level Hmin, the water inlet pump 6 is controlled to be started, and water in the cooling pool enters the water tank; S2: when the water level H is greater than or equal to a highest set water level Hmax, the water inlet pump 6 is controlled to be stopped; S3: when the water level H is between the Hmin and the Hmax, when the temperature T is less than or equal to a set temperature Tx, the water inlet pump 6 is controlled to be stopped, and when the temperature T is greater than the set temperature Tx, the water inlet pump 6 is controlled to be started.

[0019] In the control, once a corresponding control condition is triggered, a control action is triggered, and until the next time a control is triggered, the corresponding last control action ends. For example, when the water level H is greater than or equal to the highest set water level Hmax, when the water level H is less than or equal to the lowest set water level Hmin, the water inlet pump 6 is controlled to be started, at this time, the water level rises, even if the water level H exceeds the Hmin, but because the next control action is not triggered, the water inlet pump is always started until the next control (for example, the temperature T is less than or equal to the set temperature Tx) and the water inlet pump is stopped.

[0020] As a preferred, the set temperature Tx is greater than a water temperature in the cooling pool and is less than a temperature of the water outlet of the first water circuit. In order to facilitate temperature regulation, temperature sensors 1 are also arranged at positions of the cooling pool and the water outlet of the first water circuit, are used for acquiring temperatures at the cooling pool and the water outlet of the first water circuit in real time, and are used for guiding temperature control adjustment.

[0021] As a preferred, an inlet water rate of the water inlet pump 6 should be greater than an outlet water rate of the second circuit water outlet, so as to ensure that the inlet water in the water tank is greater than the outlet water when the water inlet pump 6 works, and the water level of the water tank is ensured to rise.

[0022] As another embodiment, In the control logic, the setting of the intermediate water level is added, specifically: setting the intermediate water level Hp, when the temperature T is greater than Tx, and the water level H is greater than or equal to Hp, the water inlet pump 6 is started, and at the same time the refrigeration device is started, the refrigeration device is connected with the water tank, when the temperature T is greater than Tx, and the water level H is less than Hp, only the water inlet pump 6 is started.

[0023] The purpose of adding the intermediate water level is: when the intermediate water level is reached, if the temperature still exceeds the set temperature Tx, it is possible to cause the temperature to still exceed the set temperature Tx at the highest set water level Hmax, at this time, since the highest water level Hmax is reached, the water inlet pump 6 needs to be closed, after the water inlet pump 6 is closed, due to the imbalance of the water tank, the water level will drop, at this time, the temperature of the water tank will exceed Tx, the water inlet pump 6 needs to be started, which will cause frequent actions at the water level at Hmax, in order to overcome this problem, the intermediate water level is added, once the intermediate water level Hp is exceeded, if the temperature is still greater than the set temperature Tx, the refrigeration device is started.

[0024] For the lower limit of the water level Hmin, the above-mentioned setting can also be referred to, considering that the return water temperature of the concrete in the heating stage is high, the heat carried back is large, therefore, mainly considering how to reduce the temperature of the water body in the water tank, when the lower limit of the water level Hmin is triggered, the water inlet pump 6 is started to enter cool water, which is beneficial to reducing the temperature of the water in the water tank, and the setting of not adding the intermediate water level can be considered.

[0025] The application also provides a system applying the intelligent water passing control method for mass concrete in the heating stage, the system comprises a temperature sensor 1, a water level sensor 2 and a control module 4 arranged in the water tank, the control module 4 is connected with an input module 3 and a driving module 5, the input module 3 is used for inputting the minimum set water level Hmin, the maximum set water level Hmax and the set temperature Tx, the driving module 5 is used for driving the water inlet pump 6 to start or stop, and the control module 4 is used for acquiring the data input by the input module 3 and driving the water inlet pump 6 to start or stop through the driving module 5 according to the intelligent water passing control method for mass concrete in the heating stage.

[0026] Preferably, the control module 4 is a single-chip microcomputer, and the driving module 5 is a relay, when the relay is connected, the water inlet pump 6 is started and works, and when the relay is in the disconnected state, the water inlet pump 6 is stopped and works.

[0027] The input module 3 is a touch screen or upper computer software, and is connected with the single-chip microcomputer through the touch screen or the upper computer software, wherein the upper computer software is connected in a wireless mode, the control module 4 acquires the corresponding input data of the input module 3, performs logical judgment and controls.

[0028] Taking a certain project as an example, large-volume concrete is used for the construction of the gate bottom plate. The gate bottom plate is laid with two layers of water pipes and water circuits, and the two layers of water pipes are used for cooling. The water circuit of the lower layer of water pipes enters the cooling pool, and the water circuit of the upper layer of water pipes enters the water tank. The minimum water level of the water tank is set to 0.5m and the maximum water level is 1m. Once the water level is lower than 0.5m, the water inlet pump 6 is turned on. Once the water level is higher than 1m, the water inlet pump 6 is turned off.

[0029] The water tank temperature Tx is set and the actual temperature inside the water tank is monitored in real time. Once the temperature exceeds Tx, the water inlet pump 6 is turned on, causing the water level to rise and the temperature to drop. When the temperature drops below Tx, the water inlet pump 6 is turned off, causing the water level to drop and the temperature to rise again. This control logic allows for optimal control of the water level and temperature inside the water tank.

[0030] The above embodiments are only preferred embodiments of the present invention. The protection scope of the present invention should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the present invention also includes equivalent technical means that can be thought of by those skilled in the art based on the concept of the present invention.

Claims

1. A method for intelligent water flow control during the temperature rise phase of large-volume concrete, wherein the temperature of the large-volume concrete is controlled by water flow. The method is used to control the water temperature of a water tank during the temperature rise phase of the concrete, and is characterized by: The water supply system includes a water tank, a first water circuit, a second water circuit and a cooling pool. The first water circuit and the second water circuit are both fed by the water tank and are laid out in concrete. The water outlet of the first water circuit is connected to the water tank, and the water outlet of the second water circuit is connected to the cooling pool. The cooling pool is connected to the water tank through an inlet pump and an inlet pipe. A water level sensor and a temperature sensor are provided in the water tank to obtain the water level H and temperature T of the water tank. The control method includes the following steps: S1: When the water level H is less than or equal to the minimum set water level Hmin, the water inlet pump is controlled to start, and the water in the cooling pool enters the water tank; S2: When the water level H is greater than or equal to the maximum set water level Hmax, the water inlet pump is controlled to be turned off; S3: When the water level H is between Hmin and Hmax, and when the temperature T is less than or equal to the set temperature Tx, the water inlet pump is controlled to be turned off; when the temperature T is greater than the set temperature Tx, the water inlet pump is controlled to be turned on.

2. The intelligent water flow control method for mass concrete during the temperature rise phase according to claim 1, characterized in that: The set temperature Tx is greater than the water temperature in the cooling pool and less than the temperature of the first water circuit outlet.

3. The intelligent water flow control method for mass concrete during the temperature rise phase according to claim 1, characterized in that: An intermediate water level Hp is set. When the temperature T is greater than Tx and the water level H is greater than or equal to Hp, the water inlet pump is turned on and the refrigeration device is started at the same time. The refrigeration device is connected to the water tank. When the temperature T is greater than Tx and the water level H is less than Hp, only the water inlet pump is turned on.

4. A system using the intelligent water flow control method for the temperature rise stage of large-volume concrete according to any one of claims 1 to 3, the system comprising a temperature sensor, a water level sensor, and a control module arranged in a water tank, the control module connected to an input module and a drive module, the input module being used to input a minimum set water level Hmin, a maximum set water level Hmax, and a set temperature Tx, the drive module being used to drive the water inlet pump to turn on or off, the control module being used to obtain data input by the input module, and according to the intelligent water flow control method for the temperature rise stage of large-volume concrete according to any one of claims 1 to 3, driving the water inlet pump to turn on or off through the drive module.

5. The system according to claim 4, wherein: The control module is a single chip microcomputer, and the driving module is a relay.

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