Method for manufacturing concrete structures and curing management system
The curing management system addresses the challenge of moisture content determination in large concrete surfaces by using a reflective measuring instrument and controller to automate watering, ensuring high-quality concrete curing with reduced site complexity.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- NISHIMATSU CONSTR CO LTD
- Filing Date
- 2024-10-29
- Publication Date
- 2026-05-15
Smart Images
Figure 2026078599000001_ABST
Abstract
Description
Technical Field
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[0001] The present disclosure relates to a method for manufacturing a concrete structure and a curing management system.
Background Art
[0002] Placed concrete is cured to maintain moisture in order to prevent cracking due to drying. Patent Document 1 discloses a concrete curing management system that measures the moisture content of concrete during curing using a humidity sensor and performs watering when the moisture content decreases.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Summary of the Invention
Problems to be Solved by the Invention
[0004] When curing concrete with a large surface area, it is difficult to determine the moisture content of the entire surface by measuring only the moisture content of a part of the surface. Therefore, in order to perform strict curing management, many humidity sensors must be installed to measure the moisture content at many locations, which increases the complexity of the site.
[0005] An object of the present disclosure is to provide a curing management system capable of performing high-quality curing management while suppressing complexity, and a method for manufacturing a concrete structure part capable of manufacturing a high-quality concrete structure while suppressing complexity. [[ID=4 The aforementioned curing process is, A monitoring step involves observing the surface of the concrete using a reflective measuring instrument to monitor the degree of wetness at each point on the surface, A watering step in which, if a location is found in the monitoring step in which the degree of wetness is estimated to be below a threshold, water is sprayed onto the surface, Includes, The aforementioned reflective measuring instrument is a measuring instrument that can measure the reflected light intensity and the distance to the object by irradiating light onto the object and receiving the reflected light. In the monitoring step, the degree of wetness at each location is estimated based on the reflectance intensity of each location measured by the reflectance measuring instrument, and the distance to each location.
[0007] The protective management system related to this disclosure is: A reflective measuring instrument that can measure the reflected light intensity and the distance to the object by irradiating an object with light and receiving the reflected light, A controller that manages the curing of poured concrete, Equipped with, The aforementioned controller, Based on the reflectance intensity and distance measured by the reflectance measuring instrument at each point on the surface of the concrete, the degree of wetness at each point is estimated. If a location is found where the moisture level is estimated to be below a threshold, watering of the concrete surface is requested. [Effects of the Invention]
[0008] According to this disclosure, it is possible to perform high-quality curing management while minimizing the complexity of on-site work, thereby providing high-quality concrete structures. [Brief explanation of the drawing]
[0009] [Figure 1] A block diagram showing a curing management system according to an embodiment of the present invention. [Figure 2] This diagram shows an example of the layout of the protective management system. [Figure 3]This flowchart shows the procedure for manufacturing a concrete structure according to an embodiment of the present invention. [Figure 4] This flowchart shows the detailed steps of the protective management process performed by the controller. [Figure 5] This diagram illustrates the divided areas that are set as the monitored area in the curing management process. [Figure 6] This figure shows an example of the reflectance intensity measured in the monitored area (a) and the reflectance intensity after excluding specific data and correcting based on distance (b). [Modes for carrying out the invention]
[0010] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Figure 1 is a block diagram of a curing management system 10 according to an embodiment of the present invention.
[0011] The curing management system 10 of this embodiment is a system that monitors the moisture content of concrete during curing at a construction site of a concrete structure, and automatically sprinkles water when a location is found where the moisture content is below a threshold. It can be applied to various concrete structures such as concrete floor slabs and dam bodies. When a concrete structure is manufactured by placing concrete in multiple stages, the curing management system 10 can manage the curing of the concrete at each of the multiple stages.
[0012] As shown in Figure 1, the curing management system 10 includes a reflective measuring instrument 11 for measuring the surface of concrete, a plurality of reflectors 12, a watering device 13 capable of spraying water onto the concrete surface, a water supply mechanism 14 that supplies water to the watering device 13, and a control device 15 that estimates the wetness of the concrete and controls the watering.
[0013] The reflection type measuring device 11 is a measuring device that can measure the reflection intensity of light and the distance to the measurement target by irradiating the measurement target with light and receiving the reflected light. As the reflection type measuring device 11, LiDAR (light detection and ranging) using infrared laser light can be adopted. In addition, as long as the reflection type measuring device 11 can measure the reflection intensity and the distance, light of a type other than the above laser light may be applied as the irradiated light. The reflection type measuring device 11 treats the measurement target surface as a point cloud and performs measurement with each point of the point cloud as a measurement point. The measurement of the point cloud may be realized by scanning the measurement points on the measurement target surface. Although the measurable range of the reflection type measuring device 11 is finite, it is preferable to adopt one with a wide viewing angle (that is, a measurable angle range) and a wide measurable distance range (for example, up to 20 m maximum).
[0014] The reflector 12 is for setting the boundary of the monitoring target area for monitoring the humidity. The reflector 12 reflects the light of the reflection type measuring device 11 stably and in a manner distinguishable from other objects. Therefore, by positioning the reflector 12 within the measurable range of the reflection type measuring device 11, the measurement data of the reflector 12 can be easily identified from the measurement data of the reflection type measuring device 11. Thereby, by associating each of the measurement data of the point cloud of the reflection type measuring device 11 with the coordinates in the real space, it becomes possible to identify which point in the real space the measurement data of each point of the reflection type measuring device 11 is.
[0015] The sprinkler 13 has a head 131 for sprinkling water and a hose 132 for guiding water to the head 131. The head 131 is a sprinkler that sprinkles water all around by rotating the nozzle, but any other structure may be used. The water supply mechanism 14 includes a valve mechanism and a pump for introducing pressurized water into the hose 132.
[0016] The control device 15 has a controller 151 and a storage unit 152, and is a computer or a sequencer that operates according to a program stored in the storage unit 152. The controller 151 receives the measurement data of the reflection type measuring instrument 11 via an interface (not shown). The controller 151 can control the water supply mechanism 14 via an interface (not shown).
[0017] <Arrangement example of the curing management system> FIG. 2 is a diagram showing an arrangement example of the curing management system at a construction site. FIG. 2 shows a single unit section 300 (for example, 15 m × 30 m) where concrete is placed continuously at the dam embankment construction site. In curing management, the entire surface of the placed concrete, in the example of FIG. 2, the entire surface of a single unit section 300 where concrete is placed continuously is set as a monitoring target area R0 for monitoring the humidity.
[0018] The reflection type measuring instrument 11 is preferably arranged so that the entire monitoring target area R0 is included in the measurable range. When the entire area cannot be covered by a single reflection type measuring instrument 11, a plurality of reflection type measuring instruments 11 can be installed, and by combining the measurable ranges of the plurality of units, the entire monitoring target area R0 can be included in the measurable range. In the example of FIG. 2, a single reflection type measuring instrument 11 is arranged at one end side (for example, the center) in the longitudinal direction of the monitoring target area R0, and its measurable range includes a half area R11 of the monitoring target area R0. Further, another reflection type measuring instrument 11 is arranged at the other end side (for example, the center) in the longitudinal direction of the monitoring target area R0, and its measurable range includes the remaining half area R12 of the monitoring target area R0.
[0019] Note that the measurable range of the reflection type measuring instrument 11 does not necessarily have to cover the entire monitoring target area R0. For example, when the monitoring target area R0 includes a portion where it is difficult for irrigation water to disappear, that portion may be outside the measurable range of the reflection type measuring instrument 11.
[0020] The reflectors 12 are positioned to identify the boundaries of the monitored area R0. In the example in Figure 2, the reflectors 12 are positioned at the four corners of area R11 measured by one reflective measuring instrument 11, and at the four corners of area R12 measured by the other reflective measuring instrument 11.
[0021] In cases where there are multiple units of concrete pouring sections 300, such as at a dam construction site, multiple sets of reflective measuring instruments 11 and reflectors 12 are prepared, and each set of reflective measuring instruments 11 and reflectors 12 is placed in each of the multiple units of sections 300.
[0022] Furthermore, the arrangement of the reflective measuring instrument 11 and the reflector 12 is not limited to the example above. Any arrangement is acceptable as long as it allows for measurement of almost the entire area of the monitored region R0 and enables identification of the boundary of the monitored region R0. This applies not only to dam construction sites but also to sites where various concrete structures, such as concrete floor slabs, are constructed.
[0023] <Method of manufacturing concrete structures> Figure 3 is a flowchart showing the procedure for a method of manufacturing a concrete structure according to an embodiment of the present invention. The method of manufacturing a concrete structure according to this embodiment includes a formwork step H1 for manufacturing formwork, a concrete pouring step H2 for pouring concrete into the formwork, a laitance removal step H3 for removing laitance from the poured concrete, a curing step H4 for curing the poured concrete, and a formwork relocation step H5 for removing the formwork. The laitance removal step H3 may be performed before the curing step H4. The formwork relocation step H5 may be performed as part of the curing step H4.
[0024] In cases where multiple concrete joints are required, such as in the construction of a dam embankment, the above processes H1 to H5 are repeated until there are no more joints (NO in branch H6). This is how the concrete structure is manufactured.
[0025] <Cure Management Treatment> Figure 4 is a flowchart showing the detailed procedure of the curing management process performed by the controller 151 in curing process H4. Figure 5 is a diagram illustrating the divided area r set in the monitored area R0 in the curing management process. When the process moves to curing process H4 and the reflective measuring instrument 11 and reflector 12 are set up around the concrete by the workers, the controller 151 starts the curing management process shown in Figure 4. The curing management process program 153 is stored in the storage unit 152 of the control device 15 (see Figure 1). Steps S3 to S6 in Figure 4 correspond to an example of the monitoring step according to the present invention. Steps S7 and S8 in Figure 4 correspond to an example of the watering step according to the present invention.
[0026] The surface of cement undergoing curing has the property that its light reflectivity is low when the humidity is high, such as when it is irrigated, and increases as the humidity decreases, and becomes significantly higher when the water has receded from the surface. In the curing management process, the controller 151 utilizes the above property to monitor whether there are any areas on the surface of the cement undergoing curing where the humidity has decreased.
[0027] In the curing management process, the controller 151 treats the monitored area R0 as a collection of multiple divided areas r, as shown in Figure 5. The controller 151 then estimates the wetness for each divided area r and monitors whether the wetness is below a threshold. Each divided area r is set to a size that includes multiple measurement points t of the reflective measuring instrument 11, and is also large enough (for example, 50cm x 50cm) so that there is no significant difference in wetness within a single divided area r. In Figure 5, the measurement points t are shown in a simplified manner, and a single divided area r may contain many more measurement points t. Also, the number of measurement points t included in each divided area r does not have to be the same.
[0028] As will be explained in detail later, the controller 151 estimates the wetness of each location based on the reflection intensity measurement data. However, among the many measurement points t, there is a possibility that some measurement points t may have anomalies such as small irregularities or foreign matter floating on the surface. In addition, noise may be mixed into the individual measurement data. Therefore, if the wetness of each measurement point t were estimated from the reflection intensity of each measurement point t without setting a divided region r, the anomalies or noise mentioned above would greatly affect the estimated wetness. On the other hand, as in this embodiment, by estimating the wetness for each divided region r that contains multiple measurement points, the influence of such anomalies or noise can be reduced.
[0029] When the curing management process is started, the controller 151 associates the measurement data of each point in the total point cloud obtained from the reflective measuring instrument 11 with the coordinates of the monitored area R0, determining which point in the point cloud corresponds to which position within the monitored area R0 (step S1). Specifically, in step S1, the controller 151 first extracts the measurement data of the reflector from the total point cloud to identify which point in the point cloud corresponds to the position of the reflector. Furthermore, the controller 151 calculates which point in the point cloud of measurement data corresponds to which position within the monitored area R0, based on the information of the relative position of the reflector 12 with respect to the monitored area R0. The above relative position information 155 (see Figure 1) is provided to the controller 151 in advance and stored in the storage unit 152.
[0030] Next, the controller 151 repeats the process of determining whether or not it is time for monitoring (step S2) until that time is reached. The monitoring timing may be a predetermined periodic timing, or it may be a timing whose period changes according to environmental conditions such as temperature, weather, and time of day. The period should be set to a period in which the wetness of each part of the concrete does not change significantly, for example, a 1-minute period to a 1-hour period.
[0031] When the monitoring timing is determined in step S2, the controller 151 acquires the point cloud measurement data from the reflective measuring instrument 11 (step S3), and if there are measurement points where the reflection intensity is greater than or equal to a specific intensity, the measurement data for those points is excluded (step S4). The specific intensity is set to a reflection intensity value that is greater than the reflection intensity of the surface of dry concrete and less than the reflection intensity of the head 131 of the watering device 13. The head 131 of the watering device 13 is placed on the concrete that is curing, and has a high reflection intensity. Therefore, in the point cloud measurement data, the reflection intensity of the measurement point where the head 131 is located is measured to be high. If this measurement data is included in the measurement data for part of the concrete, there is a risk that an incorrect estimation will be made that the part of the concrete is dry when it is not. In step S4, the measurement data of the above reflection intensity is excluded in order to avoid such an incorrect estimation.
[0032] The hose 132 of the watering device 13 is also placed on the concrete that is curing. Therefore, the measurement data at the measurement point where the hose 132 is located will be a value indicating the reflectivity of the hose 132. However, the reflectivity of the hose 132 is about the same as or less than that of dry concrete, and if the measurement data for this reflectivity is excluded, the data for the reflectivity of the dry concrete will also be excluded. Furthermore, the area occupied by the hose 132 is small relative to one divided area r, and the error in the measurement data due to the hose 132 is small. Therefore, the controller 151 does not remove the measurement data indicating the reflectivity of the hose 132. Note that the hose 132 or its surface may be made of a material that has a higher reflectivity than dry concrete, in which case the measurement data indicating the reflectivity of the hose 132 may be removed by the process in step S4.
[0033] Next, the controller 151 calculates a statistical value of the reflectance of multiple measurement points included in each divided region r (step S5). The statistical value can be any quantity that can represent the average reflectance of the divided region r, such as the mean value or the trimmed mean value which is the average after excluding the top and bottom few percent of the data. The controller 151 may also obtain the average reflectance by performing various other statistical analyses.
[0034] <<Relationship between wetness, reflectance, and reflectance>> As mentioned above, the surface of concrete undergoing curing exhibits a correlation: high humidity results in low reflectivity, and low humidity results in high reflectivity. Therefore, estimating reflectivity is equivalent to estimating humidity.
[0035] On the other hand, the reflectance intensity measured by the reflective measuring instrument 11, as well as the average reflectance intensity calculated in step S5, represent the intensity of the received reflected light. The reflectance intensity is higher for objects with high reflectance and lower for objects with low reflectance. However, the reflectance intensity also changes depending on other factors, such as the distance to the object being measured. Therefore, the reflectance of the object cannot be accurately determined by the reflectance intensity alone.
[0036] Therefore, in the next step S6 of the curing management process, the controller 151 performs a correction so that the reflection intensity, which is the measurement result of the reflective measuring instrument 11, approaches the reflectance of the measurement location. This correction means estimating the reflectance from the measured reflection intensity, and is therefore equivalent to estimating the degree of wetness. Accordingly, the "correction for reflection intensity" described below may be read as "estimation of reflectance" or "estimation of wetness."
[0037] <<Continuation of curing and management procedures>> After calculating the average reflectance for each divided region r in step S5, the controller 151 then corrects the reflectance value for each divided region r based on the distance to each divided region r (distance from the reflectance measuring instrument 11) (step S6).
[0038] As mentioned above, even when measuring objects with the same reflectivity, the reflective measuring instrument 11 will produce higher reflective intensity measurements when the object is close. When observing a wide, horizontal concrete surface with the reflective measuring instrument 11 at a construction site, it is often difficult to position the instrument to get a bird's-eye view of the concrete surface from a high vantage point. When observing the concrete surface from a horizontal direction, the distance to the near side and the far side differ significantly.
[0039] Given the arrangement environment of the reflective measuring instrument 11, in step S6, the controller 151 corrects the reflection intensity value from the measured value so that the shorter the distance between the divided region r and the reflective measuring instrument 11, the smaller the reflection intensity value becomes. This correction adjusts the reflection intensity measurement data so that it approaches the reflectance. As an example of a specific correction method, the controller 151 may set a correction value x that is inversely proportional to the distance, and subtract the correction value x from the average reflection intensity value of the divided region r calculated in step S5 to obtain the corrected reflection intensity. Note that the correction amount and correction formula in step S6 can be any appropriate ones, for example, the necessary correction amount and correction formula may be determined by experimentation or simulation, and the controller 151 may use these to perform the correction. The correction amount and correction formula, or information such as a correction table that expresses these in the form of a data table, 156 is provided to the control device 15 in advance and stored in the storage unit 152 (see Figure 1).
[0040] Next, the controller 151 compares the reflectance of each of the multiple divided regions r obtained in step S6 (corrected reflectance ≈ estimated wetness) with a threshold value to determine if there are any divided regions r with a reflectance greater than or equal to the threshold value (step S7). The threshold value is set to a value that identifies the degree of wetness requiring watering. The threshold information 154 is provided to the control device 15 in advance and stored in the memory unit 152 (see Figure 1).
[0041] As a result, if a watering is detected, the controller 151 determines that there are areas requiring watering and outputs a watering control signal (corresponding to a signal requesting watering) to the water supply mechanism 14, and water is sprayed onto the concrete surface via the watering device 13 (step S8). Watering is carried out continuously for a predetermined time, such as 5 minutes. Watering is not limited to a specific divided area r, but is carried out over the entire monitored area R0, although it may be controlled to be carried out more frequently in areas where watering is determined to be necessary.
[0042] On the other hand, if there is no determination result in step S7, or if the watering treatment in step S8 is performed, the controller 151 determines whether the curing period has ended (step S9), and if not, repeats the process from step S2. The controller 151 performs the above curing management process throughout the curing period (for example, two weeks), and when it determines in step S9 that the curing period has ended, it terminates the curing management process.
[0043] <Actions of steps S4 and S6> Figure 6 shows an example of the reflectance intensity measured in the monitored area R0 (a) and the reflectance intensity after excluding specific data and correcting based on distance (b). In Figures 6(a) and (b), the average values of the reflectance intensity calculated for each divided area r are shown for area R11, which is half of the monitored area R0. Lower brightness indicates higher reflectance. The reflectance measurement data is obtained from a single reflectance measuring instrument 11 located at measurement point P1 on one end of area R11.
[0044] Figures 6(a) and (b) are calculated based on measurement data obtained when the humidity of the left-hand regions C3 and C4 shown in Figure 6(b) was low. However, if the average reflection intensity is calculated using the measurement data as is, the effect of distance will be added, as shown in region C1 of Figure 6(a), where the reflection intensity increases as you get closer to the measurement point P1. In addition, the effect of obstacles will be added, as shown in region C2 of Figure 6(b), where the reflection intensity of the divided region r where the head 131 of the watering device 13 is located will be higher.
[0045] On the other hand, by performing data removal and correction in steps S4 and S6, as shown in Figure 6(b), the effects caused by distance and obstacles are removed, and the average of the calculated reflectance intensity can accurately represent the level of wetness in region R11. Therefore, by performing curing management processing that includes the data removal and correction processes in steps S4 and S6, it is possible to accurately identify areas that require watering and to perform high-quality curing management.
[0046] As described above, the concrete curing management of this embodiment is performed by observing the concrete surface using a reflective measuring instrument 11 that can measure the light reflection intensity and distance. As mentioned earlier, when observing a large concrete surface from the horizontal direction, the distance differs greatly between the near side and the far side. Therefore, even if the wetness is the same, the measured reflection intensity will be higher at locations closer to the reflective measuring instrument 11. However, in this embodiment, the wetness of each location is estimated not only based on the reflected intensity measured at each location but also based on the measured distance. Therefore, accurate wetness can be estimated. This enables high-quality concrete curing management. Furthermore, since the reflective measuring instrument 11 can measure a wide area with a single unit, there is no need to place many sensors to determine the wetness of many locations. Therefore, high-quality curing management can be achieved without complicating the work site.
[0047] Furthermore, according to the concrete structure manufacturing method of this embodiment, the reflective measuring instrument 11 is configured to treat the surface to be measured as a point cloud and to measure each measurement point. On the other hand, the controller 151 treats the concrete surface as a collection of multiple divided regions r and estimates the degree of wetness for each divided region r. The divided region r is set to a size that includes multiple measurement points t. Therefore, even if there are abnormalities in individual measurement points t or noise is included in individual measurement data, the influence of the above abnormalities or noise can be reduced in the estimation of the degree of wetness for each divided region r. Thus, the controller 151 can accurately estimate the degree of wetness at each location and realize high-quality curing management.
[0048] Furthermore, according to the concrete structure manufacturing method of this embodiment, the controller 151 corrects the measured reflectance intensity based on the measured distance. Then, the controller 151 estimates whether or not the wetness level requires watering based on the corrected reflectance intensity. Therefore, the controller 151 can accurately estimate the wetness level by easily removing the increase or decrease in reflectance intensity depending on the distance.
[0049] Furthermore, according to the concrete structure manufacturing method of this embodiment, water is sprayed via a watering device 13 placed on the surface of the concrete during curing. Therefore, watering can be performed easily and with high reliability. In addition, the controller 151 performs a process (step S4) to exclude measurement data of reflectance above a certain intensity that occurs when the head 131 of the watering device 13 overlaps with the measurement point, and estimates the degree of wetness based on the measurement data after exclusion. Therefore, it is possible to reduce misestimation of the degree of wetness caused by the presence of a head 131 with high reflectivity. Also, since the controller 151 can exclude measurement data of the head 131 without requiring position information of the head 131, workers can position the head 131 with a high degree of freedom.
[0050] Furthermore, according to the concrete structure manufacturing method of this embodiment, reflectors 12 are placed around the poured concrete, and the controller 151 identifies the monitoring area R0 based on the measurement data from the reflectors 12. Therefore, it is unnecessary for workers to register the location of the monitoring area R0 in the curing management system 10.
[0051] Embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments. For example, the above embodiment shows an example that includes a process (step S4) to exclude measurement data above a certain intensity. However, if there are no objects on the concrete that would hinder the estimation of wetness, or if the presence of such objects has little effect, the above process may be omitted. Also, the above embodiment shows an example where the unit of the area for calculating the reflectance and the unit of the area for estimating the wetness are each divided area r containing multiple measurement points t. However, if the measurement data of each measurement point t contains only small noise, or if there are no anomalies on the concrete surface that would affect the measurement data, the reflectance calculation and wetness estimation may be performed for each individual measurement point t. Also, the above embodiment shows an example of a correction of the reflectance based on distance, in which the reflectance is reduced as the distance decreases. However, for example, if multiple types of concrete with different reflectance characteristics are poured in multiple ranges at different distances, a correction may be performed to cancel out the above-mentioned differences in reflectance based on distance. Furthermore, details shown in the embodiments can be modified as appropriate without departing from the spirit of the invention. [Explanation of Symbols]
[0052] 10. Protective Covering Management System 11 Reflection measuring instrument 12 Reflector 13. Watering equipment 131 heads 132 Hose 14 Water supply mechanism 15 Control device 151 Controller R0 Monitoring Area R11, R12: Half of the monitored area r divided area t measurement point
Claims
1. The concrete pouring process, This includes a curing process for curing the concrete that has been poured, The aforementioned curing process is, A monitoring step involves observing the surface of the concrete using a reflective measuring instrument to monitor the degree of wetness at each point on the surface, A watering step in which, if a location is found in the monitoring step in which the degree of wetness is estimated to be below a threshold, water is sprayed onto the surface, Includes, The aforementioned reflective measuring instrument is a measuring instrument that can measure the reflected light intensity and the distance to the object by irradiating light onto the object and receiving the reflected light. In the monitoring step, the degree of wetness of each location is estimated based on the reflectance intensity of each location measured by the reflectance measuring instrument, and the distance to each location. A method for manufacturing concrete structures.
2. The aforementioned reflective measuring instrument is configured to treat the surface to be measured as a point cloud and to perform measurements using each point in the point cloud as a measurement point. In the monitoring step, the surface of the concrete is treated as a collection of multiple divided regions, and the degree of wetness is estimated for each of the divided regions. Each of the aforementioned plurality of divided regions is set to a size that includes the plurality of the aforementioned measurement points, In the monitoring step, the wetness of a divided region is estimated using statistical values of measurement data from multiple measurement points included in one of the divided regions. A method for manufacturing a concrete structure according to claim 1.
3. In the monitoring step, the measured reflectance is corrected based on the measured distance, and the degree of wetness is estimated based on the corrected reflectance. A method for manufacturing a concrete structure according to claim 1.
4. In the watering step, water is sprayed through a watering device placed on the surface of the concrete. The sprinkler device obtains a reflectance intensity of a specific intensity or higher when measured by the reflectance measuring instrument. The monitoring step involves excluding measurement data of reflectance above a certain intensity to estimate the degree of wetness. A method for manufacturing a concrete structure according to claim 1.
5. Multiple reflectors are installed around the aforementioned concrete. The monitoring step involves setting the area to be monitored for wetness based on the measurement data of the reflector by the reflecting measuring instrument. A method for manufacturing a concrete structure according to claim 1.
6. A reflective measuring instrument that can measure the reflected light intensity and the distance to the object by irradiating an object with light and receiving the reflected light, A controller that manages the curing of poured concrete, Equipped with, The aforementioned controller, Based on the reflectance intensity and distance measured by the reflectance measuring instrument at each point on the surface of the concrete, the degree of wetness at each point is estimated. When areas are found where the moisture level is estimated to be below a threshold, watering of the concrete surface is requested. A protective measures management system.