Concrete curing method and curing device

Abstract

To provide a cure method and a device thereof allowing a high quality construction to be constructed through properly managing water content of concrete cure sheet, always maintaining the concrete cure sheet in a wet state, and constantly supplying water in the concrete structure.SOLUTION: A cure method wet-curing concrete installed at a site with concrete cure sheet includes: a primary water supply process supplying water to the concrete cure sheet; a water content measurement process directly measuring water content of the concrete cure sheet after the primary water supply process; and a secondary water supply process supplying a predetermined amount of water to the concrete cure sheet based on the water content of the concrete cure sheet measured in the water content measurement process.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a method and an apparatus for curing concrete placed on site.

Background Art

[0002] Generally, in concrete construction, in order to ensure required qualities such as the strength, durability, and watertightness of concrete, so-called curing is necessary to keep the concrete at the temperature and humidity required for hardening for a certain period after the concrete is placed.

[0003] As disclosed in Patent Documents 1 to 5, there are various methods for curing concrete. For example, in the case of a slab or the like, a water curing method in which the surrounding formwork is made higher in advance and water is filled on the surface of the concrete, a watering curing method in which watering is performed manually by workers or automatically and constantly by a sprinkler or the like, a film curing method in which a film curing agent is sprayed at the earliest possible time after the surface finishing of the concrete to prevent evaporation of moisture, a moisture retention curing method in which the concrete is sufficiently watered and then covered with a sheet that adheres to the surface, a heat insulation curing method in which the exposed surface and openings of the concrete are covered with sheets, a heat insulation curing method in which a heat insulation mat is laid on the surface of the concrete or a formwork with a heat insulation material such as foamed urethane styrene attached is used, etc. are known, and also a curing method combining these is known.

[0004] Further, Patent Document 4 discloses a method for curing a concrete structure in which water is supplied to the outer wall and the inner wall of the concrete structure after placement, the temperature of the water supplied to the outer wall is adjusted based on the temperature of the water that has descended along the outer wall, and the temperature of the water supplied to the inner wall is adjusted based on the temperature of the water that has descended along the inner wall.

[0005] Furthermore, Patent Document 5 discloses a method for curing a concrete structure in which when curing the placed concrete structure with a concrete curing sheet, the wet state around the periphery between the concrete curing sheet and the concrete surface is measured and the wet state is remotely managed.

Prior Art Documents

Patent Document

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0007] By the way, each of the above-mentioned curing methods has its own problems. For example, in the case of the watering curing method, drying may be severe depending on the weather conditions, and the effect of watering is likely to be uneven. Also, in the case of the film curing method, it is effective for preventing very early drying after the surface finishing of the concrete, but the effect is likely to decline when the temperature is high. Further, in the case of the heat insulation curing method, it becomes difficult to maintain the appropriate temperature when the temperature is extremely low.

[0008]

[0009]

[0009] In addition, in Patent Document 4, water is supplied to the outer wall and the inner wall of the concrete structure after placement, and the temperature of the water that has descended on the outer wall and the inner wall is measured. However, it may not be possible to grasp the quantitative dry-wet state of the concrete structure itself and to carry out reliable curing. Also, in Patent Document 4, the temperature of the water that has descended on the outer wall and the inner wall is measured. However, since there is a difference between the temperature of the descended water and the temperature of the outer wall and the inner wall, it is difficult to control the temperature of the concrete surface to be within a predetermined range. Therefore, there is a concern about the occurrence of drying shrinkage cracks and temperature cracks, and there is also a possibility that the quality of the concrete cannot be ensured.Furthermore, in Patent Document 5, although it is configured to measure the moisture state around the concrete curing sheet and the concrete surface, since a general hygrometer measures relative humidity, the humidity as the measurement result changes due to a change in temperature. Therefore, it cannot be used as a value for the threshold for managing the curing of concrete. Also, since a moisture meter measures the moisture of both the concrete and the concrete curing sheet, the larger the volume of the concrete structure, the faster the drying rate of the concrete, making it difficult to confirm the moisture state of the concrete curing sheet and potentially unable to ensure the quality of the concrete.

[0010] The present invention has been made in view of such points, and an object thereof is to provide a curing method and apparatus capable of obtaining a high-quality concrete structure by appropriately managing the water content rate of a concrete curing sheet, keeping the concrete curing sheet constantly in a moist state, and continuously supplying water to the concrete structure during the curing of the concrete structure.

Means for Solving the Problem

[0011] To achieve the above object, in a first aspect of the present disclosure, in a curing method of moist-curing concrete placed on-site with a concrete curing sheet, a primary water supply step of supplying water to the concrete curing sheet, a water content rate measurement step of directly measuring the water content rate of the concrete curing sheet after the primary water supply step, and based on the water content rate of the concrete curing sheet measured in the water content rate measurement step, a secondary water supply step of supplying a preset amount of water to the concrete curing sheet are included.

[0012] According to this configuration, after installing a water supply hose on the surface of the concrete structure after placement and supplying water, the water retention capacity of the concrete curing sheet can be obtained by directly measuring the water content of the concrete curing sheet. Then, an appropriate amount of water can be supplied to the concrete structure based on the water content of the concrete curing sheet. At this time, since the water content of the concrete curing sheet is obtained, an amount of water corresponding to the water content can be supplied. In addition, since the timing of supplying water to the surface of the concrete structure can be accurately grasped based on the water content of the concrete curing sheet, water supply is not performed when it is unnecessary, and the necessary amount of water can be supplied when water supply is required.

[0013] In a second aspect of the present disclosure, it is characterized by including a transmission step of transmitting the water content of the concrete curing sheet measured in the water content measurement step to a location away from the concrete structure.

[0014] According to this configuration, since the water content of the concrete curing sheet is transmitted to a location away from the concrete structure, remote monitoring of concrete curing can be performed. For example, this configuration is particularly effective in places where it is difficult for people to enter after concrete placement, on steep slopes, at high places, in narrow areas, within radiation control areas, etc.

[0015] In a third aspect of the present disclosure, the secondary water supply step is characterized by being performed by an automatic water supply device that automatically supplies water to the concrete curing sheet.

[0016] According to this configuration, since water is automatically supplied to the concrete curing sheet, labor saving is possible particularly when performing remote monitoring.

[0017] In a fourth aspect of the present disclosure, in a curing device for wet-curing freshly placed concrete with a concrete curing sheet, the curing device includes a moisture content measuring sensor for directly measuring the moisture content of the concrete curing sheet, and a water supply device for supplying water to the concrete curing sheet, wherein the water supply device is configured to supply a preset amount of water to the concrete curing sheet based on the moisture content of the concrete curing sheet measured by the moisture content measuring sensor.

[0018] According to this configuration, after the concrete is placed, the moisture content of the concrete curing sheet is directly measured by the moisture content measuring sensor. Then, an amount of water set based on the moisture content of the concrete curing sheet can be supplied to the surface of the concrete structure. Therefore, water supply can be avoided when it is not necessary, and the necessary amount of water supply can be performed when water supply is required.

[0019] In a fifth aspect of the present disclosure, a remote operation means is connected to the water supply device, and when the water supply device receives a water supply operation or a water supply stop operation by the remote operation means, the water supply device forcibly starts or stops water supply regardless of the moisture content of the concrete curing sheet.

[0020] According to this configuration, water supply start and water supply stop can be executed at a location away from the concrete curing sheet.

[0021] In a sixth aspect of the present disclosure, the moisture content measuring sensor is installed between the concrete curing sheet and the concrete structure.

[0022] According to this configuration, when the surface of the concrete structure is covered with the concrete curing sheet, the moisture content measuring sensor comes into contact with the surface of the concrete structure or the concrete curing sheet, so that the measurement result of the moisture content by the moisture content measuring sensor becomes even more accurate.

[0023] In a seventh aspect of the present disclosure, the moisture content measurement sensor is characterized in that it is fixed to the concrete curing sheet by a magnet.

[0024] According to this configuration, the moisture content measurement sensor can be easily fixed in contact with the concrete curing sheet.

[0025] In an eighth aspect of the present disclosure, the moisture content measurement sensor is characterized in that it is fixed to the concrete curing sheet by mechanical fixing means.

[0026] According to this configuration, the moisture content measurement sensor can be easily fixed in contact with the concrete curing sheet using mechanical fixing means, i.e., screws, nuts, bolts, etc.

[0027] In a ninth aspect of the present disclosure, the moisture content measurement sensor is characterized in that it is fixed to the concrete curing sheet by a magnet and mechanical fixing means.

[0028] According to this configuration, the moisture content measurement sensor can be securely fixed to the concrete curing sheet.

[0029] In a tenth aspect of the present disclosure, it is characterized by comprising detection means for detecting any one or more of the position information, ambient temperature, concrete surface temperature, and water supply status of the concrete structure.

[0030] According to this configuration, the state of the concrete structure can be remotely monitored, and it becomes possible to manage the curing of the concrete in the same state as being on-site.

Advantages of the Invention

[0031] As described above, based on the moisture content of the concrete curing sheet, water can be supplied to the concrete curing sheet as needed. Therefore, the moisture content of the concrete curing sheet and the surface temperature of the concrete structure can be appropriately managed, and a high-quality concrete structure can be obtained.

Brief Description of the Drawings

[0032]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiments is merely illustrative in nature and is not intended to limit the present invention, its applications, or its uses.

[0034] FIG. 1 shows a concrete curing device 1 according to an embodiment of the present invention. The concrete curing device 1 is a device used when curing the concrete placed on site, and by using this concrete curing device 1, the concrete curing method according to the present invention can be implemented. Curing of concrete means maintaining the temperature and humidity required for hardening for a certain period after the concrete is placed, and it is a necessary process to ensure the required quality such as the strength, durability, and watertightness of the concrete. The above-mentioned certain period is not particularly limited and varies depending on the size and shape of the concrete structure, etc., but it can be, for example, about 5 to 10 days. In addition, concrete structures that can be cured by the concrete curing device 1 include, for example, foundation structures, floor slabs, walls, etc., but are not limited thereto.

[0035] (Overall configuration of the concrete curing device 1) As shown in FIG. 1, the concrete curing device 1 includes a master unit 10, a plurality of slave units 20, an atmosphere measuring device 30, and a water supply device (automatic water supply device) 40. The master unit 10 and the slave units 20, the master unit 10 and the atmosphere measuring device 30, and the master unit 10 and the water supply device 40 are each configured to be capable of wireless communication. The master unit 10 can be installed at a place away from the slave units 20, and can be installed, for example, in a construction management office or the like. The slave unit 20 measures the surface temperature of the concrete structure and the moisture content of the concrete curing sheet and transmits them to the master unit 10, and there may be one. The atmosphere measuring device 30 is installed near the concrete structure and constitutes a detection means for detecting the position information of the concrete structure, the air temperature (atmosphere temperature) near the concrete structure, and the surface temperature of the concrete. The atmosphere measuring device 30 measures these and transmits them to the master unit 10. The water supply device 40 is a device for supplying water to the concrete structure according to an instruction from the master unit 10. As will be described later, the water supply device 40 can automatically supply an appropriate amount of water to the concrete structure.

[0036] (Configuration of the master unit 10) As shown in FIG. 2, the master unit 10 includes a control unit 11, a communication unit 12, an antenna 13, and a storage unit 14. The master unit 10 is supplied with power from a power outlet (not shown). The communication unit 12 may be a conventionally well-known communication module, and for example, it can be configured by a 920 MHz band low-power radio device. The antenna 13 is connected to the communication unit 12 and is for transmitting and receiving radio waves in a predetermined frequency band that the communication unit 12 can handle.

[0037] The control unit 11 can be configured by a microcomputer including, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. The storage unit 14 is a part for storing the moisture content of the concrete curing sheet 50 transmitted from the slave unit 20, the atmospheric temperature data of the concrete structure transmitted from the atmosphere measuring device 30, and the concrete surface temperature data in time series respectively, and can be configured by various storage devices. Details of the control content by the control unit 11 will be described later.

[0038] Although not shown, the master unit 10 can be provided with a display screen. In this case, the moisture content of the concrete curing sheet 50 transmitted from the slave unit 20, the atmospheric temperature of the concrete structure transmitted from the atmosphere measuring device 30, the concrete surface temperature, etc. can be displayed numerically, or after processing the data, it can also be displayed in, for example, a graph format, etc., so that the operator can grasp the changes in the atmospheric temperature, surface temperature of the concrete structure, and the moisture content of the concrete curing sheet 50.

[0039] (Configuration of the slave unit 20) As shown in FIG. 3, the slave unit 20 includes a plurality of measurement units 21, a control unit 22, a communication unit 23, an antenna 24, a memory unit 25, a battery 26, and an I / F conversion unit 27. The battery 26 is for supplying power to each part of the slave unit 20. By providing the battery 26, the slave unit 20 does not need to be connected to an outlet, and the degree of freedom in the installation location is improved. For example, the slave unit 20 can be installed in a place where it is difficult for people to enter after the concrete is placed, on a steep slope, at a high place, in a narrow area, within a radiation control area, etc. Note that the slave unit 20 may be supplied with power by a power supply means other than the battery 26.

[0040] The measurement unit 21 includes a surface temperature measurement sensor 21a that measures the surface temperature of a concrete structure in a state where water is supplied to the surface of the concrete after the concrete is placed, and a moisture content measurement sensor 21b that measures the moisture content of a concrete curing sheet 50 containing water sprayed by a water supply hose or the like on the surface of the concrete after the concrete is placed. The number of measurement units 21 may be one or a plurality. The surface temperature measurement sensor 21a can be composed of, for example, a thermocouple or the like, and can output measurement results at a predetermined short interval (substantially in real time). The moisture content measurement sensor 21b is not particularly limited. For example, the relationship between the dielectric constant and the moisture content is examined in advance, and the moisture content can be obtained by converting the dielectric constant into the amount of water. This moisture content measurement sensor 21b can also output measurement results at a predetermined short interval (substantially in real time). As the moisture content measurement sensor 21b, a sensor that measures the volumetric moisture content, such as a conventionally well-known soil moisture sensor (e.g., WD-3-WT-5Y manufactured by A·R·P Co., Ltd.), can be used.

[0041] Since the surface temperature measurement sensor 21a and the moisture content measurement sensor 21b are integrated to form the measurement unit 21, the surface temperature at the same point of the concrete structure and the moisture content of the concrete curing sheet 50 can be obtained. The measurement unit 21 is provided with a signal line 21c connected to the control unit 22 of the slave unit 20. The surface temperature of the concrete structure measured by the surface temperature measurement sensor 21a and the moisture content of the concrete curing sheet 50 measured by the moisture content measurement sensor 21b are transmitted to the control unit 22 via the signal line 21c. When power supply is required for the surface temperature measurement sensor 21a and the moisture content measurement sensor 21b, it can be supplied from the control unit 22 side via the signal line 21c or a power supply line (not shown). The length of the signal line 21c can be several meters or more and can be extended by an intermediate connector 21d as required. Incidentally, the surface temperature measurement sensor 21a and the moisture content measurement sensor 21b may be separate bodies. In this case, signal lines will extend from each of the surface temperature measurement sensor 21a and the moisture content measurement sensor 21b. Also, the measurement unit 21 may be composed only of the moisture content measurement sensor 21b.

[0042] The communication unit 23 is composed of a communication module similar to the communication unit 12 of the master unit 10, enabling data transmission and reception between the master unit 10 and the slave unit 20. The antenna 24 is connected to the communication unit 23 and is for transmitting and receiving radio waves in a predetermined frequency band that the communication unit 23 can handle.

[0043] The memory unit 25 is a part for temporarily storing the surface temperature data of the concrete structure and the moisture content of the concrete curing sheet 50, and can be composed of various storage devices. The surface temperature data of the concrete structure and the moisture content of the concrete curing sheet 50 are once stored in the memory unit 25 after being measured by the surface temperature measurement sensor 21a and the moisture content measurement sensor 21b. In the memory unit 25, the surface temperature data of the concrete structure and the moisture content of the concrete curing sheet 50 can be temporarily stored, for example, once every few minutes or once every 10 minutes. The storage frequency of the surface temperature data of the concrete structure and the moisture content of the concrete curing sheet 50 is not particularly limited, and it may be stored in substantially real-time. Thereby, the trends of the surface temperature of the concrete structure and the moisture content of the concrete curing sheet 50 can be grasped.

[0044] The I / F conversion unit 27 is provided between the control unit 22 and the measurement unit 21, and is a part for enabling the signal line 21c of the measurement unit 21 to be connected to the control unit 22. A plurality of waterproof connectors 27a are provided in the I / F conversion unit 27, and the signal line 21c of the measurement unit 21 is connected to each waterproof connector 27a.

[0045] The control unit 22 is configured to cause the communication unit 23 to transmit the surface temperature data and the moisture content data stored in the memory unit 25 to the master unit 10. The transmission interval to the master unit 10 can be, for example, once every few minutes or once every 10 minutes, but this is just an example, and it may be transmitted in substantially real-time. The transmitted data is sequentially erased from the memory unit 25, but it may also be retained. Incidentally, one control unit 22 may be connected to one measurement unit 21.

[0046] (Configuration of the atmosphere measurement device 30) The atmosphere measurement device 30 shown in FIG. 1 can have the same basic configuration as the slave unit 20 and is installed near the concrete structure. The atmosphere measurement device 30 also includes a GPS (Global Positioning System) 30a for detecting the position information of the concrete structure, an atmosphere temperature sensor (outside air temperature sensor) 31 for measuring the atmosphere temperature of the concrete structure, and a temperature sensor 32 for measuring the surface temperature of the concrete structure. The atmosphere temperature sensor 31 can be composed of a thermocouple, and the temperature measured by the atmosphere temperature sensor 31 can be the outside air temperature. The temperature sensor 32 can also be composed of a thermocouple.

[0047] The position information of the concrete structure measured by the GPS 30a, the atmosphere temperature data measured by the atmosphere temperature sensor 31, and the surface temperature data of the concrete structure measured by the temperature sensor 32 are transmitted to the master unit 10. The transmission interval to the master unit 10 can be longer than the transmission intervals of the surface temperature data of the concrete structure by the slave unit 20 and the moisture content of the concrete curing sheet 50, and can be, for example, once per hour. The position information, the atmosphere temperature data, and the surface temperature data may be transmitted simultaneously or at different timings. The position information may be transmitted only once, for example, at the start of curing.

[0048] Although not shown, the atmosphere temperature sensor 31 and the temperature sensor 32 can also be provided in the slave unit 20. Also, one of the atmosphere temperature sensor 31 and the temperature sensor 32 may be omitted. Further, the atmosphere measurement device 30 may be omitted.

[0049] (Configuration of the water supply device 40) As shown in FIG. 4, the water supply device 40 includes a water supply pipe 41 through which water is supplied at a predetermined water pressure, a water spray pipe 42, a valve device 43, a control unit 44, a communication unit 45, and an antenna 46. Inside the water supply pipe 41, there is water that is constantly pressurized by, for example, a pump (not shown). The water spray pipe 42 is a pipe for supplying water to a concrete structure, and a plurality of them can be provided to increase the water spray area. When the concrete curing device 1 includes a concrete curing sheet 50, the downstream side of the water spray pipe 42 can be arranged between the surface of the concrete structure and the concrete curing sheet 50.

[0050] The valve device 43 is disposed between the water supply pipe 41 and the water spray pipe 42, and is a device for adjusting the amount of water flowing from the water supply pipe 41 to the water spray pipe 42. The valve device 43 can be configured by a conventionally well-known electric valve device. When it is in the closed state, water does not flow from the water supply pipe 41 to the water spray pipe 42, and when it is in the open state, water flows from the water supply pipe 41 to the water spray pipe 42. Further, the opening degree of the valve device 43 can be arbitrarily adjusted between the fully closed state and the fully open state, whereby the flow rate of water flowing from the water supply pipe 41 to the water spray pipe 42 is changed.

[0051] The communication unit 45 is composed of a communication module similar to the communication unit 12 of the master unit 10, and data can be transmitted and received between the master unit 10 and the water supply device 40. The antenna 46 is connected to the communication unit 45 and is for transmitting and receiving radio waves in a predetermined frequency band that the communication unit 45 can handle.

[0052] The control unit 44 controls the valve device 43 based on the instruction data (described later) transmitted from the master unit 10. The instruction data includes at least two types of instruction data: a water supply stop instruction and a water supply start instruction. The water supply start instruction data can include flow rate setting data for setting the flow rate of water. When the control unit 44 receives the instruction data, in the case of the water supply stop instruction data, it closes the valve device 43 completely, and in the case of the water supply start instruction data, it opens the valve device 43. The opening degree of the valve device 43 is changed to correspond to the flow rate setting data, enabling adjustment of the water supply amount per unit time. Also, since the control unit 44 can detect the water supply status to the concrete curing sheet 50, the control unit 44 serves as a detection means for detecting the water supply status. The water supply status to the concrete curing sheet 50 detected by the control unit 44 can be transmitted to the master unit 10, and the master unit 10 can store the water supply status to the concrete curing sheet 50. The water supply status to the concrete curing sheet 50 includes the date and time when water supply started, the date and time when water supply stopped, the water supply amount, etc.

[0053] Note that instead of the valve device 43, a water supply pump (not shown) may be provided. In this case, the control unit 44 controls the water supply pump so as to correspond to the water supply instruction data transmitted from the master unit 10. That is, in the case of the water supply stop instruction data, it stops the water supply pump, and in the case of the water supply start instruction data, it operates the water supply pump, and the water supply amount by the water supply pump can be changed to correspond to the flow rate setting data.

[0054] (Configuration of the control unit 11 of the master unit 10) The control unit 11 of the master unit 10 sets the water supply amount based on the water content rate of the concrete curing sheet 50 transmitted from the slave unit 20, and controls the water supply device 40. That is, a wet environment suitable for curing a concrete structure can be obtained by the water content rate of the concrete curing sheet 50. During the curing period of the concrete structure, if the water content rate of the concrete curing sheet 50 is kept at a predetermined level or higher, the quality of the concrete structure can be improved. Such a wet environment has been conventionally known and can also be obtained from, for example, experiments. The control unit 11 of the master unit 10 is configured to supply water by the water supply device 40 so that the water content rate of the concrete curing sheet 50 becomes a water content rate suitable for curing the concrete structure. For example, when the water content rate of the concrete curing sheet 50 transmitted from the slave unit 20 is within the range of the water content rate suitable for curing the concrete structure (water content rate of 50% or more), the control unit 11 of the master unit 10 transmits water supply stop instruction data to the water supply device 40. On the other hand, when the water content rate of the concrete curing sheet 50 transmitted from the slave unit 20 deviates to the dry side from the range of the water content rate suitable for curing the concrete structure, the control unit 11 of the master unit 10 transmits water supply start instruction data to the water supply device 40. The water supply amount is preset so that the lower the water content rate of the concrete curing sheet 50 transmitted from the slave unit 20, the larger the water supply amount by the water supply device 40. The specific water supply amount can be changed according to the size of the concrete structure, the area to be cured, the outside air temperature, etc., and can be obtained, for example, by experiments.

[0055] Incidentally, even if the water content rate of the concrete curing sheet 50 is more than a predetermined level, there is no problem, but the control unit 11 manages so as not to deviate to the dry side. The management algorithm of the control unit 11 can be obtained from experiments as described above, but can also be designed using the results of simulation considering, for example, the ambient temperature, the surface temperature of the concrete structure, the period, etc.

[0056] In this way, the water supply device 40 is controlled by the control unit 11 of the master unit 10 to set the water supply control, and can automatically supply water to the concrete curing sheet 50, so it is an automatic water supply device.

[0057] The host machine 10 can also remotely operate the water supply device 40. In this case, the host machine 10 serves as the remote operation means, and various operation switches and the like are provided on the host machine 10. Examples of the operation switches include a water supply operation switch and a water supply stop operation switch, etc., which are switches that can be manually operated by an administrator or the like. When the administrator or the like operates the water supply operation switch, the host machine 10 receives the water supply operation. Also, when the administrator or the like operates the water supply stop operation switch, the host machine 10 receives the water supply stop operation. Since the host machine 10 and the water supply device 40 are communicably connected, when the water supply device 40 receives the water supply operation by the host machine 10, regardless of the moisture content of the concrete curing sheet 50, if water supply has not been performed, it forcibly executes water supply. Further, when the water supply device 40 receives the water supply stop operation by the host machine 10, regardless of the moisture content of the concrete curing sheet 50, if water is being supplied, it forcibly executes water supply stop. Note that this remote operation means is not essential for the present invention and may be omitted.

[0058] (Concrete curing sheet) The concrete curing device 1 may include a concrete curing sheet 50 shown in FIGS. 5 and 6. The concrete curing sheet 50 covers the surface of the concrete structure and suppresses the evaporation of water on the surface of the concrete structure, that is, it may be a member that keeps the surface of the concrete structure in a wet state and can cure the concrete, and is not particularly limited. For example, the members disclosed in Patent Documents 1 to 3 can be used.

[0059] Although not shown, the concrete curing sheet 50 can be, for example, a member including a water-impermeable base sheet and a wetting material provided on the surface of the base sheet on the side of the concrete structure, a member in which a water retention layer made of a polymer water absorber and a water-impermeable heat insulation layer are integrated, a member in which a moisture retention sheet and a water-impermeable heat insulation sheet are integrated, etc. The concrete curing sheet 50 may have a single-layer structure.

[0060] When the concrete curing sheet 50 is provided, the water content measurement sensor 21b can be fixed to the surface of the concrete curing sheet 50 on the side that covers the concrete structure. As a result, when the concrete structure is covered with the concrete curing sheet 50, the water content measurement sensor 21b is disposed between the surface of the concrete structure and the concrete curing sheet 50 and is held in contact with the water absorption surface of the concrete curing sheet 50.

[0061] As a means for fixing the water content measurement sensor 21b to the concrete curing sheet 50, any means may be used. For example, fixing means using a magnet, mechanical fixing means, etc. can be mentioned. In the case of fixing means using a magnet, a first permanent magnet is fixed to the water content measurement sensor 21b, and a second permanent magnet is disposed on the side of the concrete curing sheet 50 opposite to the side of the water content measurement sensor 21b. Then, when the first permanent magnet and the second permanent magnet are arranged so as to sandwich the concrete curing sheet 50, the water content measurement sensor 21b can be fixed to a desired position on the concrete curing sheet 50 by magnetic force. Since magnetic force is used, the position adjustment of the water content measurement sensor 21b is easy and the concrete curing sheet 50 is not damaged. Further, a permanent magnet may be fixed to the water content measurement sensor 21b, and a member made of a magnetic material such as iron may be disposed on the side of the concrete curing sheet 50 opposite to the side of the water content measurement sensor 21b. Conversely, a member made of a magnetic material may be fixed to the water content measurement sensor 21b, and a permanent magnet may be disposed on the side of the concrete curing sheet 50 opposite to the side of the water content measurement sensor 21b.

[0062] In the case of mechanical fixing means, for example, fastening members such as screws, bolts, and nuts can be used. After the water content measurement sensor 21b is disposed at a desired position, the water content measurement sensor 21b and the concrete curing sheet 50 can be fastened with screws and nuts, or fastened with bolts and nuts. Thereby, the water content measurement sensor 21b can be prevented from falling off. In this case, an insertion hole through which a screw or a bolt passes can be provided in a part of the water content measurement sensor 21b.

[0063] The water content measurement sensor 21b may be fixed to the concrete curing sheet 50 by both magnetic fixing means and mechanical fixing means, or may be fixed by only one of the fixing means. Further, if necessary, the water content measurement sensor 21b may be fixed to the concrete curing sheet 50 using an adhesive or the like.

[0064] (Concrete curing method) Next, a method of curing concrete using the concrete curing apparatus 1 configured as described above will be described. As shown in FIGS. 5 and 6, a formwork 100 for constructing a concrete bottom plate 101 (concrete structure) is assembled, and concrete is placed inside the formwork 100. Although the concrete bottom plate 101 is a test structure, it can be considered to be substantially the same as a concrete structure at an actual construction site. Each dimension of the concrete bottom plate 101 can be, for example, a width of 1200 mm, a length of 20200 mm, and a thickness of 250 mm, but this is only an example. The master unit 10 can be installed at a location away from the slave unit 20, but is not limited thereto, and the master unit 10 and the slave unit 20 may be installed close to each other.

[0065] After the concrete is placed, a primary water supply process of supplying water to the surface of the concrete bottom plate 101 is performed. This may be a method by sprinkling water, but in this embodiment, a wetting method using a concrete curing sheet 50 is adopted. That is, the concrete curing sheet 50 is immersed in water for 24 hours so that the water absorption material (wetting material) of the concrete curing sheet 50 contains sufficient water. Further, the measuring unit 21 is fixed to the concrete curing sheet 50 by the fixing means using the magnet and / or mechanical fixing means. The concrete curing sheet 50 in this state is laid so as to cover the surface of the concrete bottom plate 101 with the wetting material on the surface side of the concrete bottom plate 101. The concrete curing sheet 50 can be, for example, 1000 mm in width, 20000 mm in length, and 1.3 mm in thickness, but is not limited thereto. When the wetting material of the concrete curing sheet 50 comes into contact with the surface of the concrete bottom plate 101, the surface of the concrete bottom plate 101 is supplied with water by the wetting material. Also, when the water on the surface of the concrete bottom plate 101 decreases over time, the water on the surface of the concrete bottom plate 101 is replenished by the water of the wetting material of the concrete curing sheet 50. Since the concrete curing sheet 50 has a water-impermeable layer, the water on the surface of the concrete bottom plate 101 is less likely to evaporate.

[0066] The measuring unit 21 is installed between the surface of the concrete bottom plate 101 and the concrete curing sheet 50. When a plurality of measuring units 21 are provided, they are installed at intervals from each other. When there is no concrete curing sheet 50, the measuring unit 21 may be installed so as to contact the surface of the concrete bottom plate 101.

[0067] After the primary water supply process, a water content measurement process is performed to measure the water content of the concrete curing sheet 50 by the measurement unit 21. At this time, a surface temperature measurement process for measuring the surface temperature of the concrete bottom plate 101 may be performed. In the surface temperature measurement process, the surface temperature of the concrete bottom plate 101 is measured by the surface temperature sensor 21a of the measurement unit 21. In the water content measurement process, the water content of the concrete curing sheet 50 is measured by the water content measurement sensor 21b. This can be automatically performed, for example, by giving a measurement instruction from the master unit 10 to the slave unit 20, and when the power of the slave unit 20 is on, it can also be configured to measure constantly and output the measurement result to the master unit 10.

[0068] The slave unit 20 transmits the surface temperature data of the concrete bottom plate 101 and the water content data of the concrete curing sheet 50 to the master unit 10. This is the transmission process. Therefore, in this method, the surface temperature of the concrete bottom plate 101 measured in the surface temperature measurement process and the water content of the concrete curing sheet 50 measured in the water content measurement process are included in the transmission process of transmitting to a location away from the concrete bottom plate 101, but this transmission process may be omitted.

[0069] The master unit 10 generates instruction data based on the surface temperature data transmitted from the slave unit 20 and the water content data of the concrete curing sheet 50, and transmits the generated instruction data to the water supply device 40. The water supply device 40 automatically performs water supply as required based on the instruction data transmitted from the master unit 10. That is, a secondary water supply process is performed to set the water supply amount for supplying water to the surface of the concrete bottom plate 101 based on the surface temperature of the concrete bottom plate 101 measured in the surface temperature measurement process and the water content of the concrete curing sheet 50 measured in the water content measurement process. The secondary water supply process may be performed multiple times. Also, the time when the secondary water supply process is performed can be arbitrarily set. Since the secondary water supply process is repeated until a predetermined curing period ends, the surface of the concrete structure can be properly cured. Note that this method may be terminated during the curing period and curing may be performed by another method.

[0070] (Measurement example) FIG. 7 is a graph showing the case where the atmosphere of the curing portion of a concrete structure is measured by a moisture sensor of a conventional example (corresponding to Patent Document 5). The vertical axis of the graph shown in FIG. 7 is the volume water content (%), and the horizontal axis is the elapsed time (hr) since the start of curing. Sensors 1 and 2 measure different measurement locations. As shown in this graph, since the relative humidity changes as the outside air temperature changes, measurement results reflecting the water content of the concrete curing sheet 50 cannot be obtained. Therefore, it cannot be used as a value for the threshold for managing concrete curing. Also, since the moisture meter measures the moisture of both the concrete and the concrete curing sheet 50, the larger the volume of the concrete structure, the faster the drying rate of the concrete, and it is difficult to confirm the wet state of the concrete curing sheet 50, and there is a possibility that the quality of the concrete cannot be ensured.

[0071] On the other hand, the graph on the right side of FIG. 8 shows the result of measuring the water content of the concrete curing sheet 50 by the measurement method according to the embodiment of the present invention. The vertical axis of the graph on the right side of FIG. 8 is the measured value of the water content of the concrete curing sheet 50 measured by the water content measurement sensor 21b, and the horizontal axis is the elapsed time (hr) since the start of curing. On the other hand, the vertical axis of the graph on the left side of FIG. 8 is the weight of the concrete curing sheet 50 (kg / 0.65 m 2 ), and the horizontal axis is the elapsed time (hr) since the start of curing. Also shown are the measurement results of the concrete temperature.

[0072] The weight of the concrete curing sheet 50 changes depending on the amount of water absorbed by the concrete curing sheet 50. Therefore, the graph on the left side of FIG. 8 shows the time change of the water content of the concrete curing sheet 50, and it can be seen that the weight of the concrete curing sheet 50 becomes lighter as time passes, that is, the water content (water content rate) of the concrete curing sheet 50 decreases.

[0073] The change in the measured value measured by the moisture content measurement sensor 21b shown in the graph on the right side of FIG. 8 has the same tendency as the change over time in the water content of the concrete curing sheet 50 shown in the graph on the left side. That is, by using the moisture content measurement sensor 21b of the present embodiment, it can be seen that the moisture content of the concrete curing sheet 50 can be measured with little influence from the change in the concrete temperature. Therefore, according to the present embodiment, appropriate curing management can be performed.

[0074] (Operational effects of the embodiment) According to this embodiment, after supplying water to the surface of the concrete structure after placement, the surface temperature of the concrete structure is obtained by measuring the surface temperature of the concrete structure, and the moisture content of the concrete curing sheet 50 is obtained by measuring the moisture content of the concrete curing sheet 50. Then, water can be supplied to the surface of the concrete structure based on the surface temperature of the concrete structure and the moisture content of the concrete curing sheet 50. At this time, since not only the surface temperature of the concrete structure but also the moisture content of the concrete curing sheet 50 is obtained, an amount of water corresponding to the surface temperature and the moisture content of the concrete curing sheet 50 can be supplied. In addition, since the timing of supplying water to the surface of the concrete structure can be accurately grasped based on the surface temperature of the concrete structure and the moisture content of the concrete curing sheet 50, water supply is not performed when it is not necessary, and the necessary amount of water supply can be performed when water supply is required. Therefore, the moisture content and surface temperature of the concrete curing sheet 50 can be appropriately managed, and a high-quality concrete structure can be obtained.

[0075] In addition, remote monitoring can be performed by transmitting the surface temperature of the concrete structure and the moisture content of the concrete curing sheet 50 to a location away from the concrete structure.

[0076] In addition, since water can be automatically supplied to the surface of the concrete structure, labor can be saved.

[0077] In addition, when the concrete curing sheet 50 is provided, it is possible to perform curing management based on the surface temperature and moisture content while maintaining the wet state of the concrete structure, and further labor saving can be achieved.

[0078] Furthermore, any one or more of the position information, ambient temperature, concrete surface temperature, and water supply status of the concrete structure can be detected, and the detection results can be saved. Therefore, it is possible to determine later whether the curing of the concrete structure has been appropriately performed.

[0079] (Other Embodiments) The above-described embodiments are merely illustrative in all respects and should not be construed in a limiting sense. Further, modifications and changes belonging to the equivalent scope of the claims are all within the scope of the present invention.

[0080] In the above embodiment, an automatic water supply device is used as the water supply device 40. However, the present invention is not limited to this, and a water supply device manually operated by an operator (not shown) may be used. In this case, the operator causes the surface temperature of the concrete structure and the moisture content of the curing sheet to be displayed on the display screen of the master unit 10, and waters the surface of the concrete structure when necessary.

[0081] Also, the connection between the master unit 10 and the slave unit 20, the connection between the master unit 10 and the ambient measurement device 30, and the connection between the master unit 10 and the water supply device 40 may each be a wired connection.

Industrial Applicability

[0082] As described above, the present invention can be used, for example, when curing concrete placed on-site.

Explanation of Reference Numerals

[0083] 1 Concrete curing device 10 Master unit 20 Slave unit 21 Measurement unit 21a Surface temperature measurement sensor 21b Moisture content measurement sensor 31 Ambient temperature sensor (outside air temperature sensor) 40 Water supply device 50 Concrete curing sheet

Claims

1. In a concrete curing method in which concrete poured on site is wet-cured with a concrete curing sheet, A primary water supply process for supplying water to the concrete curing sheet; After the primary water supply step, a moisture content measuring step of directly measuring the moisture content of the concrete curing sheet; and a secondary water supplying step of supplying a predetermined amount of water to the concrete curing sheet based on the moisture content of the concrete curing sheet measured in the moisture content measuring step.

2. The method for curing concrete according to claim 1, A concrete curing method comprising the steps of: transmitting the moisture content of the concrete curing sheet measured in the moisture content measuring step to a location away from the concrete structure.

3. The method for curing concrete according to claim 1 or 2, A method for curing concrete, comprising the steps of: (a) providing a second water supplying step to the concrete curing sheet by using an automatic water supplying device that automatically supplies water to the concrete curing sheet;

4. In a concrete curing device that wet cures concrete poured on site with a concrete curing sheet, A moisture content measuring sensor that directly measures the moisture content of the concrete curing sheet; A water supply device that supplies water to the concrete curing sheet, The water supply device is configured to supply a predetermined amount of water to the concrete curing sheet based on the moisture content of the concrete curing sheet measured by the moisture content measuring sensor.

5. The concrete curing apparatus according to claim 4, A remote control means is connected to the water supply device, A concrete curing apparatus characterized in that, when the water supply device receives a water supply operation or a water supply stop operation from the remote control means, the water supply device forcibly supplies water or stops the water supply regardless of the moisture content of the concrete curing sheet.

6. The concrete curing apparatus according to claim 5, A concrete curing device characterized in that the moisture content measuring sensor is installed between the concrete curing sheet and a concrete structure.

7. The concrete curing apparatus according to claim 6, 2. A concrete curing device comprising: a moisture content measuring sensor that is fixed to the concrete curing sheet by a magnet;

8. The concrete curing apparatus according to claim 6, 2 is a schematic diagram showing a concrete curing apparatus according to the first embodiment of the present invention; FIG. 3 is a schematic diagram showing a concrete curing apparatus according to the first embodiment of the present invention;

9. The concrete curing apparatus according to claim 6, A concrete curing device according to claim 1, wherein the moisture content measuring sensor is fixed to the concrete curing sheet by a magnet and a mechanical fixing means.

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