Concrete temperature control system and temperature control method

Abstract

To provide a concrete temperature control system and a concrete temperature control method capable of adjusting the temperature of concrete upon production to a target temperature by adjusting the water temperature of kneading water to desired water temperature all year round including winter and summer without using a boiler.SOLUTION: A concrete temperature control system 200 comprises: a water tank A (10A) storing hot and cold water; a water tank B (10B) storing room temperature water; a water tank C (10C) storing heat source water; a measuring tank 50 fed with the cold water and the room temperature water to generate kneading water; a mixer 70 storing the kneading water and other materials and mixing the same; a heat exchanger A (30A), a heat exchanger C (30C) and a heat pump 20 standing between the water tank A (10A) and the water tank C (10C) and executing heat exchange between the cold water and the heat source water to adjust the temperature of the hot and cold water; plural temperature sensors 96a or the like directly or indirectly measuring the temperature of the hot and cold water or the like; and a control device 100.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a temperature control system and a temperature control method for concrete. [Background technology]

[0002] In the construction of mountain tunnels, after the specified length of excavation and excavation, a series of construction cycles are carried out, including the primary spraying of concrete onto the walls of the constructed tunnel, including the sides and face, erecting steel supports, the secondary spraying, and then driving in rock bolts as necessary.At the mountain tunnel construction site, a concrete plant (batcher plant) is built to manufacture the sprayed concrete, and the concrete manufactured in the concrete plant is loaded onto a mixer truck, transported into the tunnel, and then sprayed onto the tunnel walls. Temperature control is extremely important in the production of ready-mixed concrete, and has a significant impact on the quality of shotcrete. For example, if the temperature of ready-mixed concrete is too high, the hydration reaction will accelerate, leading to a decrease in long-term strength, and because the temperature during hardening is high, cracks will easily occur if the temperature drops suddenly due to the outside air. Since mountain tunnel construction is generally carried out on an annual basis, shotcrete is applied under conditions where the outside air temperature varies greatly between summer and winter. At concrete plants for mountain tunnels, water used in the production of ready-mixed concrete is procured on-site, but the temperature of the on-site water varies depending on the outside air temperature, with the water temperature varying greatly depending on the season, from 0°C or a few degrees Celsius in winter to around 50°C in summer. Meanwhile, in the production of ready-mixed concrete, from the perspective of concrete quality as mentioned above, it is necessary to manage the temperature of the mixed concrete so that it remains relatively uniform throughout the year (for example, around 25°C).

[0003] Ready-mixed concrete is produced by mixing various materials such as coarse aggregate, fine aggregate, cement, water (mixing water), and admixtures in a mixer. Therefore, when controlling the temperature of the ready-mixed concrete, the temperature control of the mixing water, which is one of the materials, and other materials such as cement (materials other than mixing water) has a significant impact on the temperature of the concrete when it is mixed. Regarding temperature control of aggregates such as coarse aggregate and fine aggregate, it is extremely difficult to install large-capacity aggregate bins that can maintain a constant aggregate temperature in concrete plants constructed at mountain tunnel sites, so it is common to use the aggregate that arrives daily as is in the production of ready-mix concrete. Furthermore, since the temperature of the aggregate is also greatly affected by the outside air temperature, high-temperature aggregate is used in the summer and low-temperature aggregate is used in the winter.

[0004] Therefore, a realistic solution is to adjust the temperature of the mixing water, which can be temperature-controlled even in mountain tunnel concrete plants, to adjust the temperature of the ready-mixed concrete to the desired level. For example, in winter, a measure is taken to heat the mixing water using a boiler to raise the temperature of the ready-mixed concrete to be produced, but adjusting the temperature of the mixing water using a boiler requires on-site fuel management because it uses petroleum fuel, and safety management is also required to run the boiler constantly to prevent freezing, and further, there is the problem of environmental impact because carbon dioxide is emitted when the boiler is running. Furthermore, while in winter, it is possible to heat the mixing water using a boiler, despite the various issues mentioned above, in summer, there is no specific measure to lower the temperature of the mixing water, and there is a problem that the temperature of the mixing water cannot be adjusted in summer. Therefore, in summer, concrete is produced using mixing water and other materials at a high temperature, and the temperature of the concrete when mixed is inevitably high.

[0005] In view of the above, there is a need for a concrete temperature control system and method that can adjust the temperature of the mixed concrete to a target temperature by raising the temperature of the mixing water as desired in winter and lowering it as desired in summer without using a boiler.

[0006] Here, Patent Document 1 proposes a system for controlling the temperature of concrete after mixing. This system measures the temperatures of various materials in the concrete, calculates the heat capacity values ​​of the materials based on the measured temperatures to set the concrete mixing temperature within a target range, and sets the heating or cooling temperatures of the mixing water and aggregate using a formula that estimates the mixing temperature from the heat capacity values, thereby controlling the concrete mixing temperature by heating or cooling the materials.

[0007] Meanwhile, Non-Patent Document 1 proposes a concrete plant with a temperature control function. This concrete plant with a temperature control function is based on the idea that controlling the temperature of cement will improve the accuracy of predicting the temperature of the concrete after mixing, and improves the accuracy of predicting the temperature of the concrete after mixing by changing the measurement position of the sensor that measures the cement temperature or by increasing the number of sensors installed to grasp the appropriate temperature, and further reduces changes in the cement temperature by implementing measures such as heat insulation for the cement silo and drawing conveyor. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 2017-132164 [Non-Patent Document 1] A Study on Concrete Plants with Temperature Control Functions 74th Annual Academic Lecture at the 2019 National Convention of the Japan Society of Civil Engineers Summary of the Invention [Problem to be solved by the invention]

[0009] The concrete mixing temperature control system described in Patent Document 1 requires heating of aggregate, and therefore, as mentioned above, presents the inherent problem of the difficulty of heating aggregate in concrete plants actually constructed at mountain tunnel construction sites. Furthermore, while the concrete mixing temperature is controlled by heating or cooling the materials, no specific means are disclosed for cooling the mixing water, for example. Furthermore, the concrete plant with temperature control function described in Non-Patent Document 1 focuses on the measurement position and number of sensors that measure cement temperature, but no specific means are disclosed for adjusting the temperature of the mixing water as desired in both winter and summer.

[0010] The present invention aims to provide a temperature control system and method for concrete that can adjust the temperature of concrete during production to a target temperature by adjusting the temperature of mixing water to a desired temperature throughout the year, including winter and summer, without using a boiler. [Means for solving the problem]

[0011] In order to achieve the above object, one aspect of the concrete temperature control system according to the present invention is to A concrete temperature control system that measures the temperature of mixing water, which is a material used in producing concrete, measures the temperatures of other materials other than the mixing water, or assumes that the temperatures are similar to the nearby measured temperatures, and controls the temperature of the concrete to be produced to a target temperature. A water tank A containing cold or hot water, which may be cold or hot water; Aquarium tank B containing room temperature water; a water tank C containing heat source water; a measuring tank into which the cold / hot water and the room temperature water are supplied from the water tank A and the water tank B to generate the mixing water; a mixer that accommodates and kneads the mixing water and the other materials; a heat exchanger and a heat pump interposed between the water tank A and the water tank C, which adjusts the temperature of the cold / hot water by exchanging heat between the cold / hot water and the heat source water; a plurality of temperature sensors that directly or indirectly measure the temperatures of the cold / hot water, the room temperature water, the mixing water, and the manufactured concrete; and a control device that stores the target temperature, takes in measurement data from the plurality of temperature sensors, and executes control to generate the mixing water having a target water temperature for realizing the target temperature based on the measurement data and the target temperature.

[0012] According to this embodiment, by using a heat exchanger and a heat pump to adjust the temperature of cold and hot water used to produce concrete that has a target temperature when mixed, it is possible to heat and even cool water procured at the construction site without using a boiler, making it possible to adjust the mixing water to a target water temperature to achieve the target concrete temperature throughout the year. Therefore, in the summer, cold mixing water can be produced using high-temperature local water, and in the winter, warm mixing water can be produced using low-temperature local water. In this specification, the water contained in water tank A and having a temperature range from cold to warm, approximately 5°C to 50°C, is referred to as "cold and hot water." Furthermore, the temperatures of other materials other than the mixing water are merely assumed to be the same as measured or nearby measured temperatures, and the temperatures of other materials are not heated, so large-capacity aggregate bins, etc., are not required. As other materials are generally stored inside the concrete plant, the temperatures of other materials can be determined by measuring the indoor temperature inside the concrete plant, so direct measurement is acceptable, but even if direct measurement is not required, it is sufficient to "assume that the temperatures are the same as nearby measured temperatures."

[0013] In addition, "directly or indirectly measuring the temperatures of the cold / hot water, room temperature water, mixing water, and the produced concrete" means not only directly measuring each temperature with a temperature sensor, but also, for example, calculating the temperature of the mixing water based on the temperature of the cold / hot water or room temperature water without directly measuring the temperature of the mixing water (calculating instead of measuring, or identifying it from other temperatures). The inventors have demonstrated that there is almost no error between the temperature of the mixing water calculated by stabilizing the temperatures of both the cold / warm water and the room temperature water before supplying them to the metering tank and taking into account the amount of each water supplied, and the actual temperature of the mixing water; this includes a form in which the temperature of the mixing water is indirectly determined based on this rule of thumb. Furthermore, if the supply amounts (weight) of both the cold / warm water and the room temperature water are calculated and supplied to the metering tank in order to bring the mixing water to a target water temperature, the mixing water produced in the metering tank will naturally be at or near the target water temperature, making it unnecessary to directly measure the temperature of the mixing water in the metering tank. In this way, the temperature sensor in the metering tank may be eliminated, reducing the manufacturing costs of the system, or the temperature of the mixing water may actually be measured with a temperature sensor in the metering tank.

[0014] A heat pump is a device that transfers heat (volume) by repeatedly compressing or expanding gas, making use of its properties of increasing temperature through compression and decreasing temperature through expansion. This makes it possible to transfer heat not only from high temperature to low temperature, but also from low temperature to high temperature. On the other hand, a heat exchanger is a device that transfers heat, and there are various types such as plate heat exchangers, shell-and-tube heat exchangers, and fin-and-tube heat exchangers. In this embodiment, a heat exchanger and a heat pump are disposed between a water tank A containing hot and cold water and a water tank C containing heat source water. For example, two heat exchangers may be disposed on either side of one heat pump, or two heat exchangers may be disposed on either side of two heat pumps arranged in parallel. In other words, multiple heat pumps may be used depending on the amount of hot and cold water to be temperature-adjusted and the performance of the heat pumps.

[0015] The chilled / hot water and heat source water are, for example, river water or well water on-site, and the temperature of the chilled / hot water stored in Tank A fluctuates greatly, for example, within a range of about 5°C to 50°C, depending on the outdoor air temperature depending on the season. By operating the heat pump, in the summer, heat is removed from the chilled / hot water stored in Tank A and transferred to the heat source water stored in Tank C, thereby lowering the temperature of the chilled / hot water, and in the winter, heat is removed from the heat source water stored in Tank C and transferred to the chilled / hot water stored in Tank A, thereby raising the temperature of the chilled / hot water.

[0016] Tank A, which contains temperature-adjusted cold / hot water, and tank B, which contains room-temperature water, supply cold / hot water and room-temperature water to a metering tank, respectively, where mixed water consisting of cold / hot water and room-temperature water is produced. Here, the room-temperature water contained in tank B is local water, just like the cold / hot water and heat source water. In other words, even though it is called "room-temperature water," the temperature still fluctuates greatly, for example, within a range of about 5°C to 50°C, depending on the outside temperature depending on the season.

[0017] In producing the mixed water in the measuring tank, for example, the temperature of the mixed water is determined by the respective temperatures and supply amounts of the cold / warm water and room temperature water that are supplied. In this embodiment, when mixing water of a target water temperature is ultimately produced by adjusting the supply amounts of both, the temperature of the cold / warm water is set taking into account the temperature of the room temperature water, and heat transfer is performed between water tank A and water tank C so that the cold / warm water has the set water temperature.

[0018] In another aspect of the temperature control system for concrete according to the present invention, The heat exchangers include a heat exchanger A specific to the water tank A and a heat exchanger C specific to the water tank C, The water tank A and the heat exchanger A are connected to circulate the liquid through a pipe having a circulation pump therebetween, The water tank C and the heat exchanger C are connected to circulate the liquid through a pipe having a circulation pump therebetween, The heat pump is interposed between the heat exchanger A and the heat exchanger C, The heat exchanger A and the heat pump are connected to circulate the liquid through a pipe having a circulation pump interposed therebetween, The heat exchanger C and the heat pump are connected to circulate the liquid through a pipe having a circulation pump interposed therebetween.

[0019] According to this embodiment, a circulation pump is provided in each of the piping between water tank A and heat exchanger A, between water tank C and heat exchanger C, between heat exchanger A and the heat pump, and between heat exchanger C and the heat pump, and by circulating liquid in each piping, rapid heat transfer via the liquid can be achieved, allowing for efficient temperature adjustment of hot and cold water. Here, the liquid may be local water (including treated water) or a coolant liquid, etc.

[0020] In another aspect of the temperature control system for concrete according to the present invention, An adjustment tank is provided above the measuring tank, The water tank A and the adjustment tank are connected to circulate water through piping with a circulation pump interposed therebetween, A circulation pump is interposed in the water tank B, and a pipe leading to the measuring tank is connected to the water tank B, so that water is circulated between the water tank B and the pipe. The cold / hot water is circulated between the water tank A and the adjusting tank, and the temperature of the cold / hot water is stabilized before the cold / hot water is supplied to the metering tank. The room temperature water is circulated between the water tank B and the piping, and the room temperature water is supplied to the measuring tank after the temperature of the room temperature water has been stabilized.

[0021] According to this aspect, by providing an adjustment tank above the metering tank, circulating cold / warm water between water tank A and the adjustment tank to supply cold / warm water of a stable temperature to the metering tank, and circulating room temperature water between water tank B and the piping leading to the metering tank to supply room temperature water of a stable temperature to the metering tank, it becomes possible to produce mixed water at a target water temperature with high precision. Also, by disposing the adjustment tank above the metering tank, the supply of cold / warm water to the metering tank can be carried out by the cold / warm water falling under its own weight, and no dedicated pump is required for supplying cold / warm water. Furthermore, since the amount of cold / warm water supplied in the production of mixed water is generally greater than that of room temperature water, the supply of cold / warm water to the metering tank by the cold / warm water falling under its own weight can achieve an efficient supply of cold / warm water without requiring power.

[0022] In another aspect of the temperature control system for concrete according to the present invention, The control device Calculating the target water temperature of the mixing water to achieve the target temperature of the concrete to be produced based on the measurement data regarding the temperatures of the other materials; The method is characterized in that the weights of the cold / warm water and the room temperature water to be supplied to the measuring tank are calculated based on measurement data regarding the temperature of the cold / warm water whose temperature has been adjusted and measurement data regarding the temperature of the room temperature water whose temperature has been adjusted, so that the temperature of the kneaded water to be generated becomes the target water temperature.

[0023] According to this aspect, by calculating the weights of the cold / warm water and room temperature water to be supplied to the measuring tank based on measurement data relating to the respective temperatures of the temperature-adjusted cold / warm water and room temperature water so that the temperature of the mixing water to be generated becomes the target water temperature for producing concrete at the target temperature, mixing water at the target water temperature can be generated and concrete at the target temperature can be produced.

[0024] In another aspect of the temperature control system for concrete according to the present invention, The control device If the temperature of the produced first batch of concrete is higher than the target temperature, a temperature difference amount is identified, and a control is executed to produce concrete by setting the target temperature of the second batch or the third batch of concrete to be lower than the initial target temperature by the temperature difference amount; If the temperature of the first batch of concrete produced is lower than the target temperature, the temperature difference amount is identified, and the target temperature of the second or third batch of concrete is set higher than the original target temperature by the temperature difference amount, and control is executed to produce concrete.

[0025] According to this embodiment, the temperature of the concrete to be produced is compared with the target temperature, and if there is a temperature difference, feedback control is performed to change the target temperature (set temperature) by the specified temperature difference, thereby making it possible to produce concrete at the original target temperature.

[0026] In another aspect of the temperature control system for concrete according to the present invention, When the temperature of the heat source water stored in the water tank C changes by a predetermined temperature from the initial temperature during the process of using the heat source water, the heat source water is drained from the water tank C, new heat source water is supplied to the water tank C, and the drained heat source water is supplied to the mixer to wash the mixer.

[0027] According to this embodiment, by replacing the heat source water with new heat source water when its temperature becomes too high or too low during use and it can no longer function as heat source water, the production of mixing water can be continued thereafter, and the used heat source water can be used to wash the mixer without being drained, thereby making effective use of the heat source water.

[0028] Another aspect of the concrete temperature control system according to the present invention is The apparatus is configured to be able to cope with a case where the amount of the cold or hot water supplied to the measuring tank is greater than the amount of the room temperature water, Between the adjustment tank and the measuring tank, there are two systems of first and second piping, A first metering valve for rough metering is interposed in the first piping, A second metering valve for minute metering is interposed in the second pipe, after the majority of the cold / hot water to be supplied to the metering tank is supplied through the first pipe, the remaining cold / hot water is supplied to the metering tank through the second pipe, Between the water tank B and the measuring tank, there is a third piping system. A third metering valve that performs both rough metering and fine metering is interposed in the third piping, and the third metering valve supplies the remaining amount of room temperature water to the metering tank after the majority of the room temperature water has been supplied thereto.

[0029] According to this aspect, the system is configured to accommodate cases where the amount of chilled / hot water supplied to the metering tank is greater than the amount of room-temperature water. To accommodate such cases, the supply of chilled / hot water, which is supplied in a relatively larger amount than room-temperature water, from the adjustment tank to the metering tank is carried out via two pipes, the first and second pipes. Furthermore, by providing a first metering valve for rough metering in one of the first pipes and a second metering valve for fine metering in the other, the second pipe, a large amount of chilled / hot water can be efficiently supplied to the metering tank via the first pipe, while the remaining chilled / hot water up to the set supply amount can be accurately metered and supplied to the metering tank via the second pipe. This allows for precise and efficient supply of chilled / hot water to the metering tank at the set supply amount. Meanwhile, the supply of room-temperature water, which is supplied in a relatively smaller amount from water tank B, to the metering tank is carried out via a single pipe, the third pipe. Furthermore, by providing a third metering valve for both rough metering and fine metering in the third pipe, it is possible to precisely supply the set supply amount of room-temperature water to the metering tank without increasing the number of pipes.

[0030] Further, one aspect of the concrete temperature control method according to the present invention is to A method for controlling the temperature of concrete by measuring the temperatures of mixing water, which is made up of cold and warm water and room temperature water, and other materials other than the mixing water, which are materials used in producing concrete, and controlling the temperature of the concrete to be produced to a target temperature. A process A includes adjusting the temperature of the cold or hot water by performing heat exchange between the cold or hot water contained in a water tank A and heat source water contained in a water tank C using a heat exchanger and a heat pump; A process B includes measuring the temperature of the other materials and calculating a target water temperature of the mixing water to achieve the target temperature of the concrete to be produced based on measurement data regarding the temperature of the other materials; a C process in which the weights of the cold / warm water and the room temperature water are calculated based on measurement data on the temperature of the cold / warm water whose temperature has been adjusted and measurement data on the temperature of the room temperature water whose temperature has been adjusted, and the calculated weights are supplied to a measuring tank so that the temperature of the mixed water to be produced becomes the target water temperature, and the mixed water is produced in the measuring tank; The method is characterized by including a step D of supplying the mixing water and the other materials to a mixer to produce concrete and measuring the temperature of the concrete.

[0031] According to this embodiment, by using a heat exchanger and a heat pump to adjust the temperature of the cold and hot water used to produce concrete that has a target temperature when mixed, it is possible to heat and even cool water procured at the construction site without using a boiler, making it possible to adjust the mixing water to the target water temperature to achieve the target concrete temperature throughout the year. [Effects of the Invention]

[0032] As can be understood from the above explanation, the concrete temperature control system and temperature control method of the present invention can adjust the temperature of the mixing water to the desired temperature throughout the year, including winter and summer, without using a boiler, thereby adjusting the temperature during concrete production to the target temperature. [Brief explanation of the drawings]

[0033] [Figure 1] 1 is a diagram illustrating an overall configuration of an example of a concrete temperature control system according to an embodiment. [Figure 2] FIG. 10 is a diagram showing an example of heat transfer between aquarium A and aquarium C, and the water temperatures in each aquarium and the measuring tank in summer. [Figure 3] FIG. 10 is a diagram showing an example of heat transfer between tanks A and C and the water temperatures in each tank and the measuring tank in winter. [Figure 4] FIG. 2 is a diagram illustrating an example of a hardware configuration of a control device. [Figure 5] FIG. 2 is a diagram illustrating an example of a functional configuration of a control device. [Figure 6] FIG. 4 is a diagram illustrating an example of a control flow in a control device. [Figure 7] FIG. 10 is a diagram illustrating an example of heat quantity calculation. DETAILED DESCRIPTION OF THE INVENTION

[0034] Hereinafter, a concrete temperature control system and a concrete temperature control method according to an embodiment will be described with reference to the accompanying drawings. In this specification and drawings, substantially identical components are designated by the same reference numerals, and redundant explanations may be omitted.

[0035] [Concrete temperature control system and temperature control method according to the embodiment] An example of a concrete temperature control system and a temperature control method according to an embodiment will be described with reference to Figures 1 to 7. Here, Figure 1 is an overall configuration diagram of an example of a concrete temperature control system according to an embodiment. Also, Figures 2 and 3 are diagrams showing an example of heat transfer between water tank A and water tank C, and water temperatures in each water tank and measuring tank in summer and winter, respectively.

[0036] The concrete temperature control system 200 is a temperature control system formed in a concrete plant constructed on-site to produce ready mixed concrete for shotcrete in mountain tunnels.

[0037] The temperature control system 200 includes a water tank A (10A) that stores cold or hot water, which may be cold water or hot water, a water tank B (10B) that stores room temperature water, a water tank C (10C) that stores heat source water, a measuring tank 50 into which the cold or hot water and room temperature water are supplied from water tank A (10A) and water tank B (10B) to produce mixing water, a mixer 70 that stores and mixes the mixing water and other materials, and a control device 100. Here, each water tank, etc. may be stored within the concrete plant, or, depending on the storage space of the concrete plant, the water tank B (10B) that stores room temperature water may be installed outside the concrete plant, for example.

[0038] "Other materials," which indicate the materials used to make ready-mix concrete, include coarse aggregate, fine aggregate, cement, and various admixtures, which are materials used to make concrete other than mixing water.

[0039] The cold and hot water, room temperature water, and heat source water are all local water such as river water or well water that is supplied to each tank from the site. Therefore, the temperature of each water fluctuates greatly, for example, within a range of 5°C to 50°C depending on the outside air temperature depending on the season.

[0040] Temperature control system 200 does not use boilers that use fossil fuels and have an environmental impact, and furthermore, by adjusting the temperature of the mixing water to a desired temperature throughout the year, including winter and summer, the temperature of the cold and hot water used to generate the mixing water is adjusted to a desired temperature in order to adjust the temperature during concrete production (when mixed) to a target temperature. As a means for adjusting the temperature of this cold and hot water, two heat exchangers A (30A) and C (30C) and a heat pump 20 are interposed between water tank A (10A) and water tank C (10C), and heat exchange between the cold and hot water and the heat source water is performed.

[0041] Specifically, by operating the heat pump 20, in the summer, heat is removed from the chilled / hot water stored in the water tank A (10A) and transferred to the heat-source water stored in the water tank C (10C), thereby lowering the temperature of the chilled / hot water. On the other hand, in the winter, heat is removed from the heat-source water stored in the water tank C (10C) and transferred to the chilled / hot water stored in the water tank A (10A), thereby raising the temperature of the chilled / hot water.

[0042] Here, the illustrated example shows a configuration in which two heat exchangers A (30A) and C (30C) are arranged on the left and right of one heat pump 20, but depending on the amount of cold and hot water to be temperature-adjusted and the performance of the heat pump, a configuration in which two heat exchangers are arranged on the left and right of multiple heat pumps arranged in parallel may also be applied.

[0043] Water tank A (10A) and heat exchanger A (30A) are connected to circulate liquid through pipe 81, which has a circulation pump 95a interposed therebetween. Water tank C (10C) and heat exchanger C (30C) are connected to circulate liquid through pipe 82, which has a circulation pump 95b interposed therebetween. Heat exchanger A (30A) and heat pump 20 are connected to circulate liquid through pipe 83, which has a circulation pump 95c interposed therebetween, and heat exchanger C (30C) and heat pump 20 are connected to circulate liquid through pipe 84, which has a circulation pump 95d interposed therebetween.

[0044] If local water is used to transfer heat between water tank A (10A), water tank C (10C) and heat exchanger A (30A), heat exchanger C (30C), there is a good chance that fine sand or the like will be mixed in, even if the local water is treated to make it muddy. This sand may get into the heat exchanger inside the heat pump 20 and cause clogging, reducing the heat exchange efficiency of the heat pump 20. Furthermore, in consideration of the high cost of maintaining the heat pump 20, as a countermeasure, heat exchangers A (30A) and C (30C) are installed in pipes 81 and 83 between water tank A (10A) and heat pump 20, and in pipes 82 and 84 between the heat pump 20 and water tank C (10C), respectively.

[0045] Here, in order to prevent clogging of heat exchanger A (30A) and heat exchanger C (30C), a dust separator such as a multi-cyclone (not shown) may be installed in the piping 81 between water tank A (10A) and heat exchanger A (30A) and in the piping 82 between water tank C (10C) and heat exchanger C (30C).

[0046] The liquid contained in each of the pipes 81, 82, 83, and 84 may be local water (including treated water) or a coolant liquid. For example, by circulating a coolant liquid in the pipes 83 and 84 between the heat pump 20 and the heat exchanger A (30A) or heat exchanger C (30C), it is possible to prevent the cooling side of the heat pump 20 from freezing, prevent the heating side of the heat pump 20 from changing into a gas state due to a temperature rise, and prevent rust in the pipes 83 and 84.

[0047] An adjustment tank 40 is provided above the measuring tank 50 where the mixing water is produced, and the cold / hot water that has been heat exchanged with the heat source water and adjusted to a desired temperature is supplied to the adjustment tank 40 via piping 85. More specifically, a circulation pump 95e is provided in the piping 85 between the water tank A (10A) and the adjustment tank 40, and the cold / hot water is circulated between the water tank A (10A) and the adjustment tank 40 via the piping 85.

[0048] As the cold / hot water circulates between water tank A (10A) and the adjustment tank 40 in the X3 direction, the temperature of the cold / hot water stabilizes, and the temperature-stabilized cold / hot water is supplied from the adjustment tank 40 to the metering tank 50.

[0049] On the other hand, water tank B (10B) containing room temperature water and metering tank 50 are connected by piping 86 with a circulation pump 95f interposed therebetween, and in the process of circulating the room temperature water between water tank B (10B) and piping 86 in the X4 direction, the temperature of the room temperature water stabilizes, and the room temperature water with the stabilized temperature is supplied from piping 86 to metering tank 50.

[0050] A temperature sensor 96a is installed in the adjustment tank 40 to constantly measure the temperature of the hot and cold water, while a temperature sensor 96b is installed midway along the pipe 86 to constantly measure the temperature of the room temperature water.

[0051] The amount of cold / hot water supplied to the metering tank 50 is set to be greater than the amount of room-temperature water. Therefore, the piping system that supplies cold / hot water from the adjustment tank 40 to the metering tank 50 and the piping system that supplies room-temperature water from the piping 86 to the metering tank 50 are configured differently. Note that, in addition to the illustrated example, the amounts of cold / hot water and room-temperature water may be set to be equal, or the amount of room-temperature water may be set to be greater than the amount of cold / hot water. For example, the illustrated example is preferable in summer and winter because the amount of cold / hot water used is relatively large. In spring and autumn, there may be cases where the amount of room-temperature water used is relatively large, so in such cases it is preferable to set the amount of room-temperature water to be relatively large. The illustrated example is an example that is particularly suitable for summer and winter, when it is difficult to adjust the temperature of the mixing water.

[0052] Specifically, two systems of first piping 87 and second piping 88 are provided between the adjustment tank 40 and the metering tank 50, with a first metering valve 87a for rough metering interposed in the first piping 87 and a second metering valve 88a for fine metering interposed in the second piping 88. Meanwhile, one system of third piping 89 is provided between the metering tank 50 and the piping 86 leading to the water tank B (10B), with a third metering valve 89a for performing both rough metering and fine metering interposed in the third piping 89.

[0053] The first metering valve 87a for coarse metering is, for example, a butterfly valve, and the second metering valve 88a for fine metering and the third metering valve 89a that performs both coarse metering and fine metering are, for example, ball valves.

[0054] First, while measuring with the first metering valve 87a for rough metering, chilled / hot water is supplied to the metering tank 50 via the first pipe 87 in the X5 direction, and when the measured value reaches the value obtained by subtracting a preset value of 90% of the dynamic load from the target weight, the first metering valve 87a is closed. Next, the second metering valve 88a is opened, and while measuring with the second metering valve 88a for fine metering, the remaining chilled / hot water is supplied to the metering tank 50 via the second pipe 88 in the X6 direction. When the measured value reaches the value obtained by subtracting the value of 100% of the dynamic load from the target weight, the second metering valve 88a is closed, and the chilled / hot water present between the second metering valve 88a and the metering tank 50 falls into the metering tank 50, thereby supplying the target weight of chilled / hot water to the metering tank 50.

[0055] Next, third metering valve 89a is opened, and room-temperature water is supplied to metering tank 50 in the X7 direction via third piping 89 while performing coarse metering with third metering valve 89a. When the measured value reaches the value obtained by subtracting a preset 90% dynamic load value from the target weight, third metering valve 89a is switched to fine metering, and the supply of room-temperature water continues. When the measured value reaches the value obtained by subtracting 100% dynamic load value from the target weight, third metering valve 89a is closed. Room-temperature water present between third metering valve 89a and metering tank 50 falls into metering tank 50, and the target weight of room-temperature water is supplied to metering tank 50.

[0056] By providing an adjustment tank 40 above the metering tank 50, and circulating cold / warm water between water tank A (10A) and the adjustment tank 40 to supply cold / warm water of a stable temperature to the metering tank 50, and by circulating room temperature water between water tank B (10B) and the pipe 86 leading to the metering tank 50 to supply room temperature water of a stable temperature to the metering tank 50, it is possible to produce mixing water of the target water temperature with high precision for producing ready-mixed concrete whose mixing temperature is the target temperature.

[0057] Furthermore, since the adjustment tank 40 is disposed above the metering tank 50, cold / hot water can be supplied to the metering tank 50 by the gravity of the cold / hot water falling, and no dedicated pump is required for supplying cold / hot water. Furthermore, since the amount of cold / hot water supplied is greater than that of room temperature water when producing mixing water in the metering tank 50, supplying cold / hot water to the metering tank 50 by the gravity of the cold / hot water makes it possible to efficiently supply cold / hot water without requiring power.

[0058] Furthermore, by efficiently supplying a large amount of chilled or hot water to metering tank 50 via first piping 87, while accurately metering the remaining chilled or hot water up to the set supply amount via second piping 88 and supplying it to metering tank 50, it is possible to precisely and efficiently supply chilled or hot water to the metering tank at the set supply amount. On the other hand, by supplying room-temperature water, which has a relatively small supply amount, to metering tank 50 via a single system of third piping 89 and providing third piping 89 with a third metering valve 89a that performs both rough metering and fine metering, it is possible to precisely supply room-temperature water to the metering tank at the set supply amount without increasing the number of piping.

[0059] Although the illustrated example shows one metering tank 50, for example, two metering tanks may be used, with first to third pipes connected to each metering tank.

[0060] When two measuring tanks are used, for example, the mixing water required to produce one batch of ready-mixed concrete is divided into two at a predetermined ratio, and the mixing water is supplied first from one measuring tank to the mixer 70, where it is mixed, for example, for a predetermined proportion of the batch together with the other materials supplied to the mixer 70, for a certain period of time. The remaining mixing water and other materials are then supplied to the mixer 70 and mixed to produce one batch of ready-mixed concrete. This manufacturing method makes it possible to produce higher quality concrete than when mixing water and other materials are supplied to the mixer 70 at once and mixed. Note that the illustrated example shows a system equipped with one measuring tank 50 to make the system easier to understand.

[0061] The measuring tank 50 and the mixer 70 are connected by a pipe 91, and mixing water having a predetermined amount and target temperature required to produce, for example, one batch of ready-mixed concrete is supplied to the mixer 70 via the pipe 91 in the X8 direction.

[0062] Meanwhile, coarse aggregate, fine aggregate, cement, etc. stored in other material storage tank 60 within the concrete plant are supplied to mixer 70 in the X9 direction via, for example, piping 92. A temperature sensor 96c is installed in other material storage tank 60, but this temperature sensor 96c may also be installed near other material storage tank 60 within the concrete plant.

[0063] The other material storage tank 60 has separate tanks for each material, and each material is supplied from its own tank in a predetermined amount required to produce, for example, one batch of ready-mix concrete, and at the temperature within the concrete plant.

[0064] Here, instead of passing some or all of the weighed materials through the pipe 92, the ready-mixed concrete manufacturer may manually add the materials to the mixer 70.

[0065] The mixer 70 is provided with a temperature sensor 96d, which measures the temperature of the kneaded mixture.

[0066] Water tank C (10C) and mixer 70 are connected by piping 93, and when the temperature of the heat-source water changes from the initial temperature by a predetermined temperature (for example, about ±20°C) during the process of using the heat-source water, heat-source water is supplied from water tank C (10C) to mixer 70 in the direction X10 via piping 93 and used to rinse mixer 70. Meanwhile, new heat-source water is supplied to water tank C (10C) from which the heat-source water has been drained.

[0067] In this way, by replacing the heat-source water that has become too hot or too cold during use and can no longer function as heat-source water with new heat-source water, it is possible to continue producing mixing water thereafter.In addition, by using the used heat-source water for washing the mixer without having to drain it, it is possible to make effective use of the heat-source water.

[0068] The control device 100 controls the operation of various devices that make up the system (heat pump 20, circulation pump 95a, etc., first metering valve 87a, etc.), receives measurement data from each temperature sensor 96a, etc., and performs tasks such as setting the target water temperature of the cold / hot water and calculating the amount (weight) of cold / hot water and room temperature water to be supplied to the metering tank 50 so that the concrete mixing temperature reaches the set target temperature. Furthermore, although the operation of the mixer 70 is controlled by the mixer 70 alone, the control device 100 may also control the operation of the mixer 70. Note that the heat pump 20 and circulation pumps 95a to 95d may be controlled by a control device or the like that is independent of the control device 100.

[0069] 2, in the summer, the temperature of the cold / hot water in aquarium A (10A) is as high as 35°C or higher depending on the outside air temperature. Therefore, by operating the heat pump 20 using the control device 100, heat is removed from the cold / hot water in aquarium A (10A) whose temperature is about 35°C, and the heat is transferred in the X1 direction, adjusting the temperature of the cold / hot water to about 7°C as shown in the example.

[0070] The adjustment tank 40 stores cold or hot water at a stable temperature via a pipe 85, and stores cold or hot water at about 7° C., similar to the water tank A (10A), and supplies the cold or hot water to the metering tank 50.

[0071] On the other hand, the temperature of the room temperature water contained in the water tank B (10B) is about 31 to 35°C, and is supplied to the measuring tank 50 via the pipe 86.

[0072] By supplying predetermined amounts of cold / hot water of about 7°C and room temperature water of about 31 to 35°C to the metering tank 50, the amount of mixing water required for mixing one batch at, for example, about 10°C is produced in the metering tank 50.

[0073] The temperature of other materials stored in the concrete plant is around 31 to 33 degrees Celsius.

[0074] Mixing water at about 10°C and other ingredients at about 31 to 33°C are supplied to the mixer 70, and by mixing them in the mixer 70, ready-mixed concrete with a target mixing temperature of 25°C is produced.

[0075] In other words, in the summer, high-temperature water supplied from the site is cooled to produce cold water, and mixing water is produced at a target temperature that is significantly lower than the local water, thereby producing ready-mixed concrete that will have a target temperature when mixed.

[0076] 3, in winter, the temperature of the cold / hot water in water tank A (10A) is low, for example, at about 5°C depending on the outside air temperature. Therefore, by operating the heat pump 20 with the control device 100, heat is removed from the heat source water in water tank C (10C) at a temperature of about 5°C, and the heat is transferred to the cold / hot water in the X2 direction, adjusting the temperature of the cold / hot water to about 55°C as shown in the example.

[0077] The adjustment tank 40 stores cold or hot water at a stable temperature via a pipe 85, and similarly to the water tank A (10A), stores cold or hot water at about 55°C, and supplies the water to the metering tank 50.

[0078] On the other hand, the temperature of the room temperature water contained in the water tank B (10B) is about 5 to 15°C, and is supplied to the measuring tank 50 via the pipe 86.

[0079] By supplying predetermined amounts of cold water at about 55°C and room temperature water at about 5 to 15°C to the metering tank 50, the amount of mixing water required for mixing one batch at, for example, about 50°C is produced in the metering tank 50.

[0080] The temperature of other materials stored in the concrete plant is around 10 to 15 degrees Celsius.

[0081] Mixing water at about 50°C and other ingredients at about 10 to 15°C are supplied to the mixer 70 and mixed in the mixer to produce ready-mixed concrete with a target mixing temperature of 25°C.

[0082] In other words, in winter, cold water supplied from the site is heated to produce cold or hot water, and mixing water at a target temperature that is significantly higher than the local water is produced without using a boiler, thereby producing ready-mixed concrete that is at the target temperature when mixed.

[0083] Next, an example of the hardware configuration of the control device 100 will be described with reference to FIG. 4, and an example of the functional configuration of the control device 100 will be described with reference to FIG.

[0084] As shown in FIG. 4, the control device 100 is configured by an information processing device (computer) such as a personal computer (PC) or a microcomputer, and is installed in a concrete plant as a control panel, for example.

[0085] The computer constituting the control device 100 includes a CPU (Central Processing Unit) 101, a main memory device 102, an auxiliary memory device 103, a communication IF 104, and an input / output IF (interface) 105, which are interconnected by a connection bus 106. The main memory device 102 and the auxiliary memory device 103 are computer-readable recording media. Note that the above components may be provided separately, or some of the components may not be provided.

[0086] The CPU 101 is also called an MPU (Microprocessor) or a processor, and may be a single processor or a multiprocessor. The CPU 101 is a central processing unit that performs overall control of the control device 100, which is a computer. The CPU 101, for example, deploys a program stored in the auxiliary storage device 103 in an executable manner in a working area of ​​the main storage device 102, and controls peripheral devices through the execution of the program, thereby providing functions that meet a predetermined purpose.

[0087] The main memory device 102 stores computer programs executed by the CPU 101, data processed by the CPU 101, etc. The main memory device 102 includes, for example, a flash memory, a random access memory (RAM), and a read-only memory (ROM). The auxiliary memory device 103 stores various programs and various data on a readable and writable recording medium, and is also called an external memory device. The auxiliary memory device 103 stores, for example, an operating system (OS), various programs, various tables, etc. The OS includes, for example, a communication interface program that exchanges data with external devices connected via the communication IF 104. The external devices connected to the control device 100 include communication units provided in the temperature sensors 96a to 96d, the heat pump 20, the circulation pumps 95a to 95f, the metering tank 50, etc.

[0088] The auxiliary storage device 103 is used, for example, as a storage area that supplements the main storage device 102, and stores computer programs executed by the CPU 101, data processed by the CPU 101, etc. The auxiliary storage device 103 is a silicon disk including nonvolatile semiconductor memory (flash memory, EPROM (Erasable Programmable ROM)), a hard disk drive (HDD: Hard Disk Drive), a solid state drive, etc. Examples of the auxiliary storage device 103 include drives for removable recording media such as CD drives, DVD drives, and BD drives, and examples of removable recording media include CDs, DVDs, BDs, USB (Universal Serial Bus) memories, and SD (Secure Digital) memory cards.

[0089] The input / output IF 105 is an interface for inputting and outputting data between devices connected to the control device 100. Input devices such as a keyboard, a touch panel, a mouse, or other pointing device, and a microphone are connected to the input / output IF 105. The control device 100 receives operation instructions and the like from an operator who operates the input device via the input / output IF 105.

[0090] The input / output IF 105 is also connected to, for example, a display device such as a liquid crystal panel (LCD: Liquid Crystal Display) or an organic electroluminescence (EL: Electroluminescence) panel, a printer, a speaker, or other output devices.

[0091] The communication IF 104 is an interface with a network to which the control device 100 is connected. The communication IF 104 receives measurement data from the temperature sensors 96a to 96d via various networks, such as a public network such as the Internet, a wireless network such as a mobile phone network, a dedicated network such as a VPN (Virtual Private Network), or a LAN (Local Area Network), and similarly, via the network, performs metering by the first metering valve 87a, the second metering valve 88a, and the third metering valve 89a based on supply amount data calculated by the control device 100. Here, the control device 100 and some or all of the devices may be connected by wire, in which case there is no need to send and receive data via a network.

[0092] 5, the control device 100 provides various functions, such as at least a communication unit 110, an equipment control unit 112, a measuring tank control unit 114, a feedback control unit 116, a display unit 118, and a storage unit 120, by executing a program by a CPU 101. Here, at least a part of the processing functions may be provided by a DSP (Digital Signal Processor), a GPU (Graphics Processing Unit), or the like, and similarly, at least a part of the processing functions may be provided by a dedicated LSI (Large Scale Integration) such as an FPGA (Field-Programmable Gate Array), a numerical calculation processor, an image processing processor, or other digital circuits.

[0093] The communication unit 110 receives the measurement data transmitted from the temperature sensors 96a to 96d as needed, and stores the data in the storage unit 120. The storage unit 120 stores the target temperature of the ready-mixed concrete when it is mixed.

[0094] The equipment control unit 112 calculates the target temperature of the mixing water to be used to achieve the target temperature of the concrete to be produced based on measurement data related to other materials, and operates the heat pump 20 to generate mixing water at the target temperature by referring to measurement data related to the current cold and hot water.

[0095] The metering tank control unit 114 calculates the weight of each of the cold / hot water and room temperature water to be supplied to the metering tank 50 so that the water temperature of the kneaded water to be produced becomes the target water temperature, and causes the first metering valve 87a, the second metering valve 88a, and the third metering valve 89a to measure the weight of each of the cold / hot water and room temperature water.

[0096] A series of control flows in the above-mentioned equipment control unit 112 and measuring tank control unit 114 are as shown in Fig. 6. That is, when automatic measuring starts, the weight of mixing water is calculated from the blending data, the mixing amount for one batch, the sand surface water ratio, and the gravel surface water ratio (step S10).

[0097] Next, the target temperature of the mixing water is calculated from the target temperature at the end of mixing (the intermediate value between the upper and lower allowable limits), the aggregate temperature (air temperature in the plant ± a corrected value), the cement temperature (air temperature in the plant ± a corrected value), the admixture temperature (air temperature in the plant ± a corrected value), and the mixed temperature for the next batch and thereafter (step S12). For example, by inputting the minimum temperature (lower allowable limit) and maximum temperature (upper allowable limit) at the end of mixing of the fresh concrete on the setting screen of the display unit 118, the intermediate temperature (intermediate value) between the input minimum and maximum temperatures at the end of mixing is automatically set as the target temperature at the end of mixing. To cite a specific numerical example, for example, by inputting a minimum temperature of 20°C and a maximum temperature of 25°C, the target temperature at the end of mixing is set to 22.5°C, with an allowable temperature range of ±2.5°C. In other words, in this method of inputting the upper and lower allowable limits and setting the intermediate value as the target temperature at the end of mixing, the allowable temperature range also changes when the input values ​​are changed.

[0098] Next, the mixing ratio of cold / warm water to room temperature water is calculated from the target water temperature of the mixing water, the weight of the mixing water, the temperature of the cold / warm water, and the temperature of the room temperature water, and the weight of the cold / warm water and room temperature water is determined from the calculated mixing ratio (step S14).

[0099] Next, cumulative measurements are carried out in the measuring tank in the order of cold / hot water and room temperature water (step S16).

[0100] Finally, after the release of the mixing water is completed, the process moves to measuring the next mixing (next batch) (step S18).

[0101] When the specified number of times of kneading has been completed, the kneading ends and the system waits until the next automatic weighing is started.

[0102] In addition, the feedback control unit 116 reads out measurement data regarding the temperature of the concrete produced by the mixer 70 from the storage unit 120 and compares it with the target temperature, and if there is a certain temperature difference between the two, performs feedback control to change the target temperature (set temperature) by the specified temperature difference.

[0103] Specifically, if the temperature of the first batch of concrete produced is higher than the target temperature, the temperature difference is identified, and the target temperature of the second or third batch of concrete is set lower than the original target temperature by the temperature difference, and control is performed to produce the concrete.

[0104] On the other hand, if the temperature of the first batch of concrete produced is lower than the target temperature, the temperature difference is identified, and the target temperature of the second or third batch of concrete is set higher than the original target temperature by the temperature difference amount, and control is performed to produce the concrete.

[0105] Here, an example of feedback control when the metering tank 50 has a pre-metering function will be described below.

[0106] For example, assume that the advance metering function in the metering tank 50 is turned on, the target temperature is 25°C ± 2°C (23°C to 27°C), and the mixing temperature of the first batch is 22°C (lower than the target temperature).

[0107] In this case, the target temperature for the second batch will be 25°C, the same as the first batch, and the weight of the mixing water will be calculated with a target temperature for calculation of 25°C. The target temperature for the third batch will be 26°C, with 1°C added as the correction value for the first batch, and the weight of the mixing water will be calculated with a target temperature for calculation of 26°C.

[0108] On the other hand, assume that the advance metering function in the metering tank 50 is turned on, the target temperature is 25°C ± 2°C (23°C to 27°C), and the mixing temperature of the first batch is 28°C (higher than the target temperature).

[0109] In this case, the target temperature for the second batch will be 25°C, the same as the first batch, and the weight of the mixing water will be calculated with a target temperature for calculation of 25°C. The target temperature for the third batch will be 24°C, with -1°C added, the correction value for the first batch, and the weight of the mixing water will be calculated with a target temperature for calculation of 24°C.

[0110] On the other hand, it is assumed that the advance metering function in the metering tank 50 is turned off, the target temperature is 25°C, and the temperature of the finished mixture for the first batch is 22°C.

[0111] In this case, the target temperature for the second batch is 26°C, which is the correction value for the first batch added by 1°C, and the weight of the mixing water with a target temperature for calculation of 26°C is calculated.

[0112] On the other hand, it is assumed that the advance metering function in the metering tank 50 is turned off, the target temperature is 25°C, and the temperature of the finished mixture for the first batch is 28°C.

[0113] In this case, the target temperature for the second batch is 24°C, with the correction value for the first batch being added -1°C, and the weight of the mixing water with a target temperature for calculation of 24°C is calculated.

[0114] In this way, if the kneaded temperature is out of range when the advance metering function is ON, the temperature error is fed back in the next batch, and if the kneaded temperature is out of range when the advance metering function is OFF, the temperature error is fed back in the next batch.

[0115] Returning to FIG. 5, the display unit 118 displays the measured values ​​of each temperature sensor, the target temperature at the time of mixing, the temperature of the cold and hot water, etc., and further displays the temperature difference between the mixed temperature of the first batch and the target temperature, as described above.

[0116] Fig. 7 is a sheet showing an example of a series of steps to calculate the target mixing water temperature to achieve a target mixing temperature of 25°C when the ambient temperature is 15°C, taking into consideration the temperatures of other materials, the ambient temperature, the specific heat of other materials, mechanical heat, etc. Under the conditions of the illustrated example, the target mixing water temperature is calculated to be about 36°C.

[0117] According to the temperature control system 200, the temperature of the cold and hot water used to produce concrete that has a target temperature when mixed is adjusted using heat exchanger A (30A), heat exchanger C (30C), and heat pump 20.This makes it possible to heat and even cool water procured at the construction site without using a boiler, and therefore makes it possible to adjust the mixing water to a target water temperature to achieve the target concrete temperature throughout the year.

[0118] Moreover, the concrete temperature control method according to the embodiment includes the following steps A to D.

[0119] In process A, the temperature of the cold or hot water stored in water tank A (10A) is adjusted by heat exchange using heat exchanger A (30A) and heat exchanger C (30C) and heat pump 20 between the cold or hot water and the heat source water stored in water tank C (10C).

[0120] In process B, the temperatures of the other materials are measured, and based on the measurement data on the temperatures of the other materials, the target water temperature for mixing water is calculated to achieve the target temperature of the concrete to be produced.

[0121] In process C, the weights of the cold / warm water and the room temperature water are calculated based on the measurement data on the temperature of the temperature-adjusted cold / warm water and the measurement data on the temperature of the temperature-adjusted room temperature water, and are supplied to the measuring tank 50 so that the temperature of the mixed water to be produced becomes the target water temperature, and the mixed water is produced in the measuring tank 50.

[0122] In process D, mixing water and other materials are supplied to the mixer 70 to produce concrete, and the temperature of the concrete when mixed is measured and compared with the target temperature. If there is a temperature difference between the two, feedback control is performed to achieve the target temperature in the next batch or the batch after that.

[0123] It should be noted that the present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0124] 10A: Aquarium A 10B:Aquarium B 10C:Aquarium C 20: Heat pump 30A: Heat exchanger A (heat exchanger) 30C: Heat exchanger C (heat exchanger) 40: Adjustment tank 50:Measuring tank 60: Other material storage tank 70: Mixer 81, 82, 83, 84, 85, 86, 91, 92, 93: Piping 87: First piping 87a: First metering valve 88: Second piping 88a: Second metering valve 89: Third piping 89a: Third metering valve 95a, 95b, 95c, 95d, 95e, 95f: Circulation pump 96a, 96b, 96c, 96d: Temperature sensors 100: Control device 110: Communications Department 112: Equipment control unit 114: Measuring tank control unit 116: Feedback control section 118:Display section 120: Storage area 200: Concrete temperature control system (temperature control system)

Claims

1. A concrete temperature control system that measures the temperature of mixing water, which is a material used in producing concrete, measures the temperatures of other materials other than the mixing water, or assumes that the temperatures are similar to the nearby measured temperatures, and controls the temperature of the concrete to be produced to a target temperature. a water tank A containing cold or hot water; a water tank B containing room temperature water; a water tank C containing heat source water; a measuring tank into which the cold / hot water and the room temperature water are supplied from the water tank A and the water tank B to generate the mixing water; a mixer that accommodates and kneads the mixing water and the other materials; a heat exchanger and a heat pump interposed between the water tank A and the water tank C, which adjusts the temperature of the cold / hot water by exchanging heat between the cold / hot water and the heat source water; a plurality of temperature sensors that directly or indirectly measure the temperatures of the cold / hot water, the room temperature water, the mixing water, and the manufactured concrete; a control device that stores the target temperature, inputs measurement data from the plurality of temperature sensors, and executes control to generate the mixing water having a target water temperature for achieving the target temperature based on the measurement data and the target temperature.

2. The heat exchangers include a heat exchanger A specific to the water tank A and a heat exchanger C specific to the water tank C, The water tank A and the heat exchanger A are connected to circulate the liquid through a pipe having a circulation pump therebetween, The water tank C and the heat exchanger C are connected to circulate the liquid through a pipe having a circulation pump interposed therebetween, The heat pump is interposed between the heat exchanger A and the heat exchanger C, The heat exchanger A and the heat pump are connected to circulate a liquid through a pipe having a circulation pump interposed therebetween, 2. The concrete temperature control system according to claim 1, wherein the heat exchanger C and the heat pump are connected to circulate liquid through piping with a circulation pump interposed therebetween.

3. An adjustment tank is provided above the measuring tank, The water tank A and the adjusting tank are connected to circulate water through piping with a circulation pump interposed therebetween, A circulation pump is interposed in the water tank B, and a pipe leading to the measuring tank is connected to the water tank B, so that water is circulated between the water tank B and the pipe. The cold / hot water is circulated between the water tank A and the adjusting tank, and the temperature of the cold / hot water is stabilized before the cold / hot water is supplied to the metering tank.

3. A concrete temperature control system as described in claim 1 or 2, characterized in that the room temperature water is circulated between the water tank B and the piping, and the room temperature water is supplied to the measuring tank after the temperature of the room temperature water has stabilized.

4. The apparatus is configured to be able to cope with a case where the amount of the cold or hot water supplied to the measuring tank is greater than the amount of the room temperature water, Between the adjustment tank and the measuring tank, there are two systems of first and second piping, A first metering valve for rough metering is interposed in the first piping, A second metering valve for minute metering is interposed in the second pipe, after the majority of the cold / hot water to be supplied to the metering tank is supplied through the first pipe, the remaining cold / hot water is supplied to the metering tank through the second pipe, Between the water tank B and the measuring tank, there is a third piping system. A concrete temperature control system as described in claim 3, characterized in that a third metering valve that performs both rough metering and fine metering is interposed in the third piping, and the third metering valve supplies the remaining amount of room temperature water to the metering tank after the majority of the room temperature water has been supplied to the metering tank.

5. The control device Calculating the target water temperature of the mixing water to achieve the target temperature of the concrete to be produced based on the measurement data regarding the temperatures of the other materials; 5. A concrete temperature control system as claimed in any one of claims 1 to 4, characterized in that the weights of the cold / warm water and the room temperature water to be supplied to the measuring tank are calculated based on measurement data relating to the temperature of the temperature-adjusted cold / warm water and measurement data relating to the temperature of the temperature-adjusted room temperature water so that the temperature of the mixing water to be generated becomes the target water temperature.

6. The control device If the temperature of the produced first batch of concrete is higher than the target temperature, a temperature difference amount is identified, and a control is executed to produce concrete by setting the target temperature of the second batch or the third batch of concrete to be lower than the initial target temperature by the temperature difference amount; 6. A concrete temperature control system according to claim 1, characterized in that, when the temperature of the first batch of concrete produced is lower than the target temperature, a temperature difference amount is identified, and the target temperature of the second or third batch of concrete is set higher than the initial target temperature by the temperature difference amount to produce concrete.

7. A method for controlling the temperature of concrete by measuring the temperatures of mixing water, which is made up of cold and warm water and room temperature water, and other materials other than the mixing water, which are materials used in producing concrete, and controlling the temperature of the concrete to be produced to a target temperature. A process A includes adjusting the temperature of the cold or hot water by performing heat exchange between the cold or hot water contained in a water tank A and heat source water contained in a water tank C using a heat exchanger and a heat pump; A process B includes measuring the temperatures of the other materials and calculating a target water temperature of the mixing water to achieve the target temperature of the concrete to be produced based on measurement data regarding the temperatures of the other materials; a C process in which the weights of the cold / warm water and the room temperature water are calculated based on measurement data relating to the temperature of the temperature-adjusted cold / warm water and measurement data relating to the temperature of the room temperature water contained in a water tank B so that the water temperature of the mixed water to be produced becomes the target water temperature, and the calculated weights are supplied to a measuring tank, and the mixed water is produced in the measuring tank; A method for controlling the temperature of concrete, comprising a step D of supplying the mixing water and the other materials to a mixer to produce concrete and measuring the temperature of the concrete.

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