Method for controlling pouring of cement composition

Abstract

To grasp a flow rate of a cement composition with accuracy and manage placing of concrete.SOLUTION: A placing management method of a cement composition has: a wave form obtaining step of obtaining a wave form indicating a secular change of a height of the cement composition on the basis of respective measurement results of a first measurement meter and a second measurement meter arranged spaced away for the prescribed distance in a flow direction of the cement composition flowing at an inclined part; and a speed calculation step of calculating a speed of the cement composition flowing at the inclined part on the basis of a phase difference between the wave form obtained from the measurement result of the first measurement meter and the wave form obtained from the measurement result of the second measurement meter, and the prescribed distance.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method for controlling pouring of a cement composition. [Background technology]

[0002] Concrete (an example of a cement composition) is often pumped from the chute of a ready-mix concrete truck to the hopper of a pump truck at a construction site, and then pumped to the pouring point through hoses and piping. For this reason, in Patent Document 1, the number of pump pours is counted, and the volume of concrete delivered by each pump pour is multiplied to calculate the poured amount of concrete (poured amount: m 3 A method for recording the [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 56-15464 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, the flow of concrete delivered from the chute of the ready-mix concrete truck to the pouring site is not directly measured, so the measurement accuracy of the pouring amount is insufficient. On the other hand, at a concrete pouring site, for example, it is necessary to accurately grasp the flow velocity (m / s) of the concrete flowing through the chute and set the pouring speed (m 3 / s) and driving amount (m 3 It is becoming necessary to cast concrete while controlling the speed and other factors more precisely. For example, when constructing CFT (concrete filled steel tube) construction, it is necessary to carefully control the pouring speed of the concrete. Also, in order to order concrete without waste, it is becoming necessary to measure the amount of concrete poured more precisely.

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to more accurately grasp the flow rate of a cement composition and to control the pouring of concrete. [Means for solving the problem]

[0006] The main invention for achieving the above-mentioned object is a method for managing the pouring of a cement composition, comprising: a waveform acquisition step for acquiring a waveform indicating a change in height of the cement composition over time based on the measurement results of a first measuring instrument and a second measuring instrument arranged at a predetermined distance apart in the flow direction of the cement composition flowing down the inclined portion; and a velocity calculation step for calculating the velocity of the cement composition flowing down the inclined portion based on the phase difference between the waveform obtained from the measurement results of the first measuring instrument and the waveform obtained from the measurement results of the second measuring instrument, and the predetermined distance. Other features of the present invention will become apparent from the following detailed description of the present invention and the accompanying drawings. Effect of the Invention

[0007] According to the present invention, the flow rate of the cement composition can be accurately grasped, and the pouring of concrete can be controlled. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic explanatory diagram showing an example of a method for pouring concrete. [Diagram 2] FIG. 2 is a schematic diagram of a measurement unit 30. [Diagram 3] 3A and 3B are explanatory diagrams of a method for measuring the height of concrete using a first measuring gauge 31 and a second measuring gauge 32. FIG. [Figure 4] 1 is a flow diagram of a method for managing the pouring of concrete 50. FIG. [Diagram 5] FIG. 5A is a graph showing a first measured waveform which is the measurement result of the first measurement instrument 31, and FIG. 5B is a graph showing a second measured waveform which is the measurement result of the second measurement instrument 32. [Figure 6]FIG. 6A is a graph showing the results of frequency analysis of the first measured waveform, and FIG. 6B is a graph showing the results of frequency analysis of the second measured waveform. [Figure 7] 11 is a graph showing a result of removing noise from a first measured waveform and a second measured waveform. [Figure 8] 1 is an explanatory diagram of a method for calculating the flow velocity of concrete 50. FIG. [Figure 9] 1 is an explanatory diagram of a method for calculating the pouring speed of concrete 50. FIG. [Figure 10] 1 is an explanatory diagram of a method for calculating the amount of concrete 50 to be poured. FIG. [Figure 11] 11A and 11B are explanatory diagrams showing a state in which measuring instruments 31 and 32 detect aggregate 51A contained in concrete 50. FIG. [Figure 12] 4 is a diagram showing specific points PA and PB on a first measured waveform and a second measured waveform. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] At least the following points will become apparent from the description of this specification and the accompanying drawings. A method for managing the pouring of a cement composition, comprising: a waveform acquiring step of acquiring a waveform indicating a change in height of the cement composition over time based on the measurement results of a first measuring instrument and a second measuring instrument arranged at a predetermined distance apart in the flow direction of the cement composition flowing down the inclined portion; and a velocity calculating step of calculating the velocity of the cement composition flowing down the inclined portion based on the phase difference between the waveform obtained from the measurement results of the first measuring instrument and the waveform obtained from the measurement results of the second measuring instrument, and the predetermined distance.

[0010] According to such a method for controlling pouring of a cement composition, the flow rate of the cement composition can be calculated with high accuracy based on the results of actually measuring the cement composition flowing on the inclined portion. Based on the accurate flow rate of the cement composition, the pouring work can be managed in detail.

[0011] This method for managing the pouring of a cement composition is characterized in that it includes a step of calculating a volumetric flow rate, which is the flow rate of the cement composition flowing down the inclined section per unit time, based on the cross-sectional area of ​​the cement composition flowing down the inclined section and the velocity of the cement composition.

[0012] According to such a method for controlling pouring of a cement composition, a highly accurate volumetric flow rate can be calculated based on a highly accurate flow rate of the cement composition. Therefore, quality can be guaranteed in construction (e.g., construction of CFT construction) that requires careful control of the volumetric flow rate (pouring rate).

[0013] A method for managing the pouring of such a cement composition, comprising a step of acquiring the amount of the cement composition that has flowed down the inclined portion during a predetermined period of time based on the volumetric flow rate during the predetermined period of time.

[0014] According to such a method for managing pouring of a cement composition, the amount of the cement composition (amount poured) can be obtained based on the flow rate and the volumetric flow rate of the cement composition with high accuracy. Therefore, the cement composition can be ordered efficiently.

[0015] This is a method for managing the pouring of a cement composition, characterized in that in the step of calculating the volumetric flow rate, the cross-sectional area of ​​the cement composition flowing down the inclined section is obtained based on information regarding the height of the cement composition flowing down the inclined section obtained from the measurement results of at least one of the first and second measuring meters, and the cross-sectional shape of the inclined section.

[0016] According to such a method for controlling pouring of a cement composition, a more accurate volume flow rate can be calculated based on the actual measurement of the height of the cement composition flowing through the inclined portion. In addition, the measurement results of the meter used for determining the flow rate (phase difference of the waveform) of the cement composition can also be used for determining the cross-sectional area of ​​the cement composition.

[0017] This is a method for managing the pouring of a cement composition, characterized in that, as information regarding the height of the cement composition, an average value of the height based on the measurement results of the first measuring instrument at a specified time and the height based on the measurement results of the second measuring instrument at the specified time is obtained at each specified time.

[0018] According to such a method for managing pouring of a cement composition, a more accurate volumetric flow rate can be calculated based on the cross-sectional area of ​​the cement composition that changes every predetermined time. In addition, since both the height of the cement composition measured by the first measuring instrument and the height of the cement composition measured by the second measuring instrument are taken into account at a predetermined time, a more accurate volumetric flow rate can be calculated.

[0019] This is a method for managing the pouring of a cement composition, characterized in that in the waveform acquisition step, a process for removing noise components is performed on each of the measurement results of the first measuring instrument and the measurement results of the second measuring instrument, and the phase difference of the waveforms from which the noise components have been removed is acquired.

[0020] According to such a method for managing pouring of a cement composition, it becomes easier to accurately determine the phase difference of the waveforms based on the waveforms from which noise components have been removed.

[0021] This is a method for managing the pouring of a cement composition, wherein the noise component removal process involves performing a fast Fourier transform on each of the measurement results of the first measuring instrument and the measurement results of the second measuring instrument to obtain peak frequencies, and based on the respective peak frequencies, obtaining a first waveform which corresponds to the measurement result of the first measuring instrument and is the waveform from which the noise components have been removed, and a second waveform which corresponds to the measurement result of the second measuring instrument and is the waveform from which the noise components have been removed.

[0022] According to such a method for managing pouring of a cement composition, it becomes easier to accurately determine the phase difference of the waveforms based on the waveforms from which noise components have been removed.

[0023] The method for managing the pouring of a cement composition includes the steps of: obtaining a height of the cement composition at a predetermined time from at least one of the first waveform and the second waveform; obtaining a cross-sectional area of ​​the cement composition flowing through the inclined portion based on the height and the cross-sectional shape of the inclined portion; and sequentially calculating a volumetric flow rate at the predetermined time, which is the flow rate of the cement composition flowing through the inclined portion per unit time, based on the cross-sectional area and the velocity of the cement composition at the predetermined time.

[0024] According to such a method for managing the pouring of a cement composition, it becomes easier to obtain the height of the cement composition at a specified time based on a waveform from which noise components have been removed, and the volumetric flow rate of the cement composition based on that height can be calculated more accurately.

[0025] This is a method for managing the pouring of a cement composition, characterized in that the phase difference of the waveform is the phase difference between a specific point of the waveform that is the measurement result of the first measuring instrument and the same specific point of the waveform that is the measurement result of the second measuring instrument.

[0026] According to such a method for managing pouring of a cement composition, since noise removal processing is not performed, the flow velocity of the cement composition is calculated quickly.

[0027] This is a method for managing the pouring of a cement composition, characterized in that the first measuring device and the second measuring device are arranged so that their positions in the direction perpendicular to the flow direction overlap.

[0028] According to this method for managing pouring of a cement composition, the first and second measuring instruments can easily detect the same part of the cement composition. Therefore, the waveforms measured by the first and second measuring instruments have similar shapes, making it easier to accurately calculate the phase difference between the waveforms.

[0029] === Implementation form === <Pouring concrete> Fig. 1 is a schematic diagram showing an example of a method for pouring concrete. In Fig. 1, a ready-mix concrete truck 10 and a pump truck 20 are deployed to a concrete pouring site. The ready-mix concrete truck is also called a mixer truck or a truck agitator.

[0030] The ready mixed concrete truck 10 is a vehicle that transports concrete materials delivered from a concrete manufacturing plant to a pouring site while mixing them. The ready mixed concrete truck 10 is equipped with a drum 12 and a chute 14 (corresponding to an inclined portion).

[0031] The drum 12 is a generally cylindrical container for loading ready mixed concrete (hereinafter, simply referred to as concrete). The drum 12 keeps rotating all the time while the ready mixed concrete truck 10 is traveling, kneading and mixing the concrete materials. This prevents separation of the aggregate and water, and keeps the concrete homogeneous.

[0032] The chute 14 is a member for guiding (discharging) the concrete in the drum 12 to a desired unloading position, and is provided with an incline behind the drum 12. The chute 14 of this embodiment is also provided with a measuring unit 30 (described later).

[0033] The pump truck 20 is a vehicle for pumping the concrete transported to the site by the ready-mix concrete truck 10 to a pouring location. The pump truck 20 includes a hopper 22, a pump 24, and a concrete supply pipe 26.

[0034] The hopper 22 is provided at the rear of the pump truck 20 and is disposed so as to face the chute 14 of the ready-mix concrete truck 10. The hopper 22 receives the concrete discharged from the chute 14 of the ready-mix concrete truck 10. The concrete delivered to the hopper 22 is passed through a concrete supply pipe 26 by the drive of a pump 24 and poured into a formwork or the like.

[0035] <About the measuring unit 30> Fig. 2 is a schematic diagram of the measurement unit 30. Figs. 3A and 3B are explanatory diagrams of a method for measuring the height of concrete using a first measurement gauge 31 and a second measurement gauge 32.

[0036] The measuring unit 30 is provided in the chute 14 of the ready-mixed concrete truck 10, and measures the height (top height) of the concrete flowing through the chute 14. The measuring unit 30 of this embodiment is detachable from the chute 14, and can be attached to the chute 14 of the ready-mixed concrete truck 10 that has been dispatched. However, this is not limited to this, and the measuring unit 30 may be attached to the chute 14 of the ready-mixed concrete truck 10 in advance. Furthermore, the measuring unit 30 may be attached to a member other than the chute 14 (the inclined portion through which the concrete flows).

[0037] The measuring section 30 includes a first measuring instrument 31, a second measuring instrument 32, a first fixing tool 33, a second fixing tool 34, a pair of magnet stands 35, and a movable support tool 36. Here, the direction in which concrete flows in the chute 14 is referred to as the flow direction, and the direction perpendicular to the flow direction is referred to as the width direction. The first fixing tool 33 is a steel material arranged to extend from the movable support tool 36 in the width direction of the chute 14. The second fixing tool 34 is a long and narrow flat plate (iron plate, etc.), arranged along the flow direction, and one end in the longitudinal direction (the end on the upstream side in the flow direction in FIG. 2) is fixed to the first fixing tool 33. The pair of magnet stands 35 are placed on the second fixing tool 34, and each holds the first measuring instrument 31 and the second measuring instrument 32.

[0038] The movable support 36 has a cart (not shown) and a vertically extending steel material (36) placed on the cart, and the first fixing device 33 is fixed to the steel material (36). As the movable support 36 moves, the first fixing device 33, the second fixing device 34, the first measuring device 31, and the second measuring device 32 also move. Therefore, by adjusting the position of the movable support 36, the first measuring device 31 and the second measuring device 32 can be installed at the desired position of the chute 14. In addition, since the measuring unit 30 is not fixed to the chute 14 using a vice or the like, the work of removing the measuring unit 30 from the chute 14 becomes easy, and the work of installing the measuring device 30 in the chute of another ready-mixed concrete truck also becomes easy. However, the present invention is not limited to this, and the measuring device 30 may be a type that is fixed to the chute 14.

[0039] The first and second measuring gauges 31 and 32 are arranged at a predetermined distance W apart in the flow direction of the concrete flowing through the chute 14, and measure the height of the concrete 50 flowing through the chute 14. For this reason, the first and second measuring gauges 31 and 32 are attached to a magnet stand 35 so as to face the concrete flowing through the chute 14. Furthermore, in this embodiment, the first measuring gauge 31 is provided upstream of the second measuring gauge 32 in the flow direction.

[0040] An example of the first measurement meter 31 and the second measurement meter 32 is a laser displacement meter 34. The laser displacement meter 34 has a laser emitting unit (not shown) and a reflected laser receiving unit (not shown), and measures the distance to the measurement object by receiving, with the reflected laser receiving unit, a laser irradiated from the laser emitting unit and reflected by the measurement object. In the following description, the first measurement meter 31 and the second measurement meter 32 are collectively referred to as measurement meters 31, 32.

[0041] To measure the height of the concrete, first, as shown in Fig. 3A, the distances d1 and d2 from each of the measuring gauges 31 and 32 to the bottom surface of the chute 14 (distances in a direction perpendicular to the bottom surface of the chute 14) are measured when no concrete is flowing in the chute 14. Then, as shown in Fig. 3B, the measuring gauges 31 and 32 measure the distances d11 and d21 to the surface of the concrete 50 when concrete 50 is flowing in the chute 14. Then, the measurement results d11 and d21 are subtracted from the distances d1 and d2 from each of the measuring gauges 31 and 32 to the chute 14. In this way, the heights h1 (= d1 - d11) and h2 (= d2 - d21) of the concrete that each measuring gauge 31 and 32 faces are obtained.

[0042] First embodiment: Method for managing pouring of concrete 50 FIG. 4 is a flow diagram of a method for managing the pouring of concrete 50. FIG. 5A is a graph showing a first measured waveform, which is a measurement result of the first measuring instrument 31, and FIG. 5B is a graph showing a second measured waveform, which is a measurement result of the second measuring instrument 32. FIG. 6A is a graph showing a result of frequency analysis of the first measured waveform, and FIG. 6B is a graph showing a result of frequency analysis of the second measured waveform. FIG. 7 is a graph showing a result of removing noise from the first measured waveform and the second measured waveform. FIG. 8 is an explanatory diagram of a method for calculating the flow velocity of concrete 50. FIG. 9 is an explanatory diagram of a method for calculating the pouring speed of concrete 50. FIG. 10 is an explanatory diagram of a method for calculating the pouring amount of concrete 50.

[0043] First, when the ready-mixed concrete truck 10 arrives at the pouring site of the concrete 50, an operator attaches the measuring unit 30 to the chute 14 of the ready-mixed concrete truck 10 (S01). The measuring unit 30 may be attached to the chute 14 of the ready-mixed concrete truck 10 in advance. The first measuring instrument 31 and the second measuring instrument 32 are connected to a terminal 40 (PC, tablet terminal, smartphone, etc.) that processes the measurement results, so that they can communicate with each other by wire or wirelessly. The control unit (CPU) of the terminal 40 executes the following operations according to a program stored in the memory unit. Although not shown, the terminal 40 may also import the measurement results of the measuring instruments 31 and 32 via a data logger.

[0044] Before starting to pour the concrete 50, as shown in FIG. 3A, the distance d1 from the first measuring gauge 31 to the bottom surface of the chute 14 and the distance d2 from the second measuring gauge 32 to the bottom surface of the chute 14 are measured (S02).

[0045] At the same time as pouring of the concrete 50 starts, as shown in Fig. 3B, the measurement meters 31, 32 start measuring the distances d11, d12 to the concrete 50 (S03). The control unit of the terminal 40 acquires the measurement results d11, d12 of the measurement meters 31, 32, and calculates the heights h1, h2 of the concrete 50 by subtracting the measurement results d11, d21 from the distances d1, d2 to the bottom surface of the chute 14 that were measured in advance.

[0046] Then, the control unit of the terminal 40 acquires a waveform (first measured waveform) indicating the change over time of the height h1 of the concrete 50 facing the first measurement meter 31, as shown in Fig. 5A, as the measurement result of the first measurement meter 31. Similarly, the control unit of the terminal 40 acquires a waveform (second measured waveform) indicating the change over time of the height h2 of the concrete 50 facing the second measurement meter 32, as shown in Fig. 5B, as the measurement result of the second measurement meter 32. In the graphs of Fig. 5A and 5B, the horizontal axis indicates time, and the vertical axis indicates the heights h1 and h2 of the concrete 50.

[0047] Next, the control unit of the terminal 40 performs a process of removing noise components from each of the measurement result (first measured waveform) of the first measuring instrument 31 and the measurement result (second measured waveform) of the second measuring instrument 32. Then, the control unit of the terminal 40 acquires waveforms indicating the change over time in heights h1 and h2 of the concrete 50 from which the noise components have been removed (S05: waveform acquisition step), as shown in Fig. 7. In the graph of Fig. 7, the horizontal axis indicates time, and the vertical axis indicates heights h1 and h2 of the concrete 50.

[0048] The control unit of the terminal 40 performs a fast Fourier transform on each of the measurement results (first measured waveform) of the first measuring instrument 31 and the measurement results (second measured waveform) of the second measuring instrument 32 as a process for removing noise components, and performs frequency analysis as shown in Fig. 6A and Fig. 6B. In the graphs of Fig. 6A and Fig. 6B, the horizontal axis indicates frequency, and the vertical axis indicates a value correlated with the amplitude of the waveform. As a result of the frequency analysis, the peak frequency (dominant frequency) at which the value on the vertical axis is the largest is obtained. The peak frequency is the frequency of vibration that greatly affects the change in height of the concrete 50 (the frequency of vibration that increases the amplitude of the height of the concrete 50).

[0049] In this embodiment, it is considered that the vibration caused by the rotation of the drum 12 that supplies the concrete 50 to the chute 14 greatly affects the change in height of the concrete 50. Both the first measurement gauge 31 and the second measurement gauge 32 measure the height of the concrete 50 affected by the rotation of the drum 12. Therefore, as shown in Figs. 6A and 6B, the peak frequency of the first measured waveform and the peak frequency of the second measured waveform are almost the same value. It is considered that the first measured waveform (Fig. 5A) and the second measured waveform (Fig. 5B) include, as noise components, the periodic change in the height of the concrete 50 caused by the rotation of the drum 12, as well as the vibration of the pump vehicle 20 and the change in the height of the concrete 50 caused by the aggregate 51 contained in the concrete 50.

[0050] 7, based on the respective peak frequencies, the control unit of the terminal 40 acquires a first noise-removed waveform (corresponding to the first waveform) from which noise components have been removed and which corresponds to the measurement result (first measured waveform) of the first measurement instrument 31, and a second noise-removed waveform (corresponding to the second waveform) from which noise components have been removed and which corresponds to the measurement result (second measured waveform) of the second measurement instrument 32. In this embodiment, the first noise-removed waveform and the second noise-removed waveform are represented as sine waves.

[0051] Next, the control unit of the terminal 40 acquires the phase difference between the first noise-removed waveform and the second noise-removed waveform, and calculates the speed (flow velocity (m / s)) of the concrete 50 flowing through the chute 14 based on the phase difference and the installation distance between the first measuring instrument 31 and the second measuring instrument 32 in the flow direction (the predetermined distance W shown in Figure 3A) (S06: speed calculation step).

[0052] For example, as shown in Fig. 8, the control unit of the terminal 40 may be set to obtain the phase difference of the waveforms at every predetermined time ΔT (e.g., every 5 seconds or every 10 seconds) and calculate the flow velocity of the concrete 50. The phase difference of the waveforms may be obtained, for example, from the difference at the maximum value point, the difference at the minimum value point, or the difference at the same height point in the first noise-removed waveform and the second noise-removed waveform. At this time, the installation interval W between the first measuring instrument 31 and the second measuring instrument 32 should not be too large so as to avoid obtaining a phase difference based on waveform parts that are more than one period apart. In this way, the phase difference can be obtained accurately.

[0053] Specifically, when a phase difference of N° is obtained, the time (s) of the phase difference is calculated by multiplying the time of one period "1 / f(s)" based on the frequency f of at least one of the first noise-removed waveform and the second noise-removed waveform (for example, the average value of both frequencies) by "phase difference N° / 360°." Then, the flow velocity (m / s) of concrete 50 is calculated by dividing the installation interval W (m) of measuring meters 31 and 32 by the time (s) of the phase difference.

[0054] The time interval at which the control unit of the terminal 40 performs the noise component removal process (fast Fourier transform) may be the same as the time interval ΔT at which the flow velocity of the concrete 50 (phase difference of the waveform) is calculated, or may be different from ΔT.

[0055] Next, the control unit of the terminal 40 calculates the pouring speed (m 3 The driving speed (m / s) is calculated (S07). 3 / s) is the flow rate (m 3 ) of concrete 50 flowing through the chute 14 per unit time (s). 3 ) is the volumetric flow rate (m 3 / s).

[0056] As shown in FIG. 9, the cross-sectional area A (m 2 ) changes, and the flow rate (m 3 ) changes. Therefore, the control unit of the terminal 40 controls the cross-sectional area A (m 2 ) and the flow velocity (m / s) of the concrete 50, 3 / s) is calculated. Also, the cross-sectional area A (m 2 ) is obtained based on information about the height of the concrete 50 flowing through the chute 14 (details will be described later) and the cross-sectional shape of the chute 14.

[0057] For example, a table of cross-sectional areas A corresponding to various heights of the concrete 50 is stored in the storage unit of the terminal 40, and when the control unit of the terminal 40 acquires information regarding the height of the concrete 50, the control unit refers to the table and calculates the corresponding cross-sectional area A (m 2 In addition, a function formula for calculating the cross-sectional area A is stored in the storage unit of the terminal 40, and when the control unit of the terminal 40 acquires information regarding the height of the concrete 50, the control unit of the terminal 40 calculates the cross-sectional area A (m 2 9 shows chute 14 having a semicircular cross-sectional shape, but the cross-sectional shape of chute 14 is not particularly limited.

[0058] The control unit of the terminal 40 calculates the cross-sectional area A (m 2 ) by the flow velocity (m / s) of the concrete 50 calculated at each predetermined time ΔT, 3 / s) is calculated. 3The time interval for calculating the flow velocity (m / s) of the concrete 50 may be the same as the time interval ΔT for calculating the flow velocity (m / s) of the concrete 50, or may be different from ΔT.

[0059] Next, the control unit of the terminal 40 determines a predetermined period and a driving speed (volume flow rate: m 3 Based on the flow rate, the pouring volume (m 2 ) is the amount of concrete 50 that flows through the chute 14 in a given period of time. 3 ) is obtained (S08). The pouring amount of concrete 50 (m 3 ) is the driving speed (m 3 It is calculated by multiplying the driving time (s) by the driving time (s).

[0060] The predetermined period is the pouring period of the concrete 50. Examples of the pouring period of the concrete 50 include the period required to complete the discharge of the concrete 50 from the ready mixed concrete truck 10, the period required to complete the pouring of the concrete 50 into the target formwork, or the period from the timing when the discharge of the concrete 50 from the ready mixed concrete truck 10 starts or the timing when the pouring of the concrete 50 into the target formwork starts to the current time.

[0061] For example, in a predetermined period (ta to ti) shown in FIG. 10, the driving speed (m 3 / s) is calculated. In that case, the driving amount (m 3 ) is acquired every predetermined time ΔT from the timing (ta) at which the acquisition of the target value is started. 3 / s) 3 Specifically, the drive speed V(tb) from time ta to time tb is multiplied by a predetermined time ΔT to calculate the drive amount "V(tb) × ΔT", and the drive amount from the next time tb to time tc "V(tc) × ΔT" is added to this drive amount, and so on until time ti.

[0062] However, the above is not limiting. For example, the amount of implantation (m3 In order to calculate V(ave), the average value V(ave) of the drive speed calculated during a predetermined period (ta to ti) may be calculated and multiplied by the time (s) of the predetermined period to obtain the drive amount. Alternatively, the drive amount may be obtained by multiplying a predetermined value (maximum value, minimum value, intermediate value between the maximum value and minimum value, etc.) of the drive speed calculated during the predetermined period (ta to ti) by the time (s) of the predetermined period.

[0063] As described above, in this embodiment, a waveform ( FIG. 7 ) showing a change over time in the height of the concrete 50 is obtained based on the measurement results of the first measuring instrument 31 and the second measuring instrument 32, which are arranged at a predetermined distance W apart in the flow direction of the concrete 50. Then, based on the phase difference between the waveform obtained from the measurement results of the first measuring instrument 31 and the waveform obtained from the measurement results of the second measuring instrument 32 and the predetermined distance W, the flow velocity (m / s) of the concrete 50 flowing through the chute 14 is calculated to manage the pouring of the concrete 50.

[0064] In other words, by utilizing the fact that the height of the concrete 50 changes over time due to the influence of the rotation of the drum 12 of the ready-mix concrete truck 10, the part of the concrete 50 detected by the first measuring instrument 31 on the upstream side is also detected by the second measuring instrument 32 on the downstream side after it has flowed a predetermined distance W. In this way, the waveform obtained from the measurement results of the first measuring instrument 31 and the waveform obtained from the measurement results of the second measuring instrument 32 will have approximately the same shape, and these waveforms will appear with a phase difference, shifted by the time it takes for the concrete 50 to flow between the first measuring instrument 31 and the second measuring instrument 32. Therefore, the flow velocity (m / s) of the concrete 50 can be calculated by dividing the installation distance W of the measuring instruments 31 and 32 by the phase difference of the waveforms.

[0065] In this manner, in this embodiment, the flow velocity (m / s) of the concrete 50 is calculated with high accuracy based on the results of actually measuring the concrete 50 flowing through the chute 14. Then, based on the flow velocity (m / s) of the concrete 50 calculated with high accuracy, the pouring speed (m 3 / s) and driving amount (m 3) is also calculated with high accuracy. Therefore, quality can be guaranteed even in construction work that requires precise control of the pouring speed of the concrete 50 (for example, construction of CFT construction). In addition, concrete can be ordered without waste based on the precisely calculated pouring amount.

[0066] Furthermore, since the fluidity of the concrete 50 decreases over time, the fluidity (quality) of the concrete 50 may be evaluated based on the precisely calculated flow velocity of the concrete 50. When the concrete 50 hardens and becomes difficult to flow (when the fluidity decreases), the flow velocity slows down. Therefore, for example, a threshold value may be set at which a malfunction (poor filling, bean blots, pipe blockage, etc.) may occur due to the decrease in fluidity of the concrete 50, and the fluidity of the concrete 50 may be evaluated by comparing the flow velocity of the concrete 50 with the threshold value.

[0067] Also, unlike the present embodiment, the amount of concrete poured (m 3 Then, workers measure the time it takes for the ready-mix concrete truck to dispense the concrete and the time it takes to pour the concrete into the formwork, and then calculate the pouring speed.

[0068] In contrast to the above method, in this embodiment, the flow rate, pouring speed, and pouring amount of the concrete 50 can be calculated with high accuracy. Furthermore, information such as the flow rate can be confirmed even during pouring of the concrete 50. For example, the control unit of the terminal 40 may cause the display unit (display, etc.) to display the results of the height, flow rate, pouring speed, and pouring amount of the concrete 50 at the current time, or display waveforms showing the changes over time in the height, flow rate, pouring speed, and pouring amount of the concrete 50 as shown in FIG. 7 and FIG. 10. In this way, workers on site can check the above information in real time, allowing for more detailed management of the construction work.

[0069] In this embodiment, after the measuring meters 31, 32 and the terminal 40 are installed in the chute 14, information such as the flow rate of the concrete 50 is automatically calculated. This saves the worker time and simplifies the construction. Also, compared to the method in which the worker manually calculates the pouring amount, etc., as described above, information such as the flow rate of the concrete 50 is calculated more quickly.

[0070] Furthermore, when the worker manually calculates the pouring amount, etc., as described above, the worker must contact the construction personnel, which causes trouble and time loss. In contrast, in this embodiment, the communication function of the terminal 40 is used to automatically transmit information such as the flow rate of the concrete 50 calculated by the terminal 40 to another terminal of the construction personnel, or the construction personnel can access the terminal 40 at a desired timing to obtain the information. This further reduces the worker's time and effort.

[0071] In this embodiment, the flow velocity of the concrete 50 is calculated using laser displacement meters (first measurement meter 31 and second measurement meter 32) that measure the distance to the measurement object. Therefore, this can be realized at a lower cost than, for example, a case in which the surface of the concrete 50 is photographed with a camera to measure the flow velocity, etc.

[0072] Furthermore, in this embodiment, a process for removing noise components (fast Fourier transform) is performed on each of the measurement result of the first measurement instrument 31 (first measured waveform in FIG. 5A) and the measurement result of the second measurement instrument 32 (second measured waveform in FIG. 5B). Then, the flow velocity of the concrete 50 is calculated based on the phase difference between the first noise-removed waveform from which the noise components have been removed and the second noise-removed waveform (FIG. 7). Therefore, it becomes easier to accurately determine the phase difference based on the waveform from which the noise components have been removed, and the flow velocity of the concrete 50 can be calculated with higher accuracy.

[0073] However, the method of removing noise components is not limited to fast Fourier transform. For example, there is a method of removing noise components by averaging multiple waveforms. In this case, at each position of the first measuring instrument 31 and the second measuring instrument 32, multiple measuring instruments are arranged in the width direction (direction perpendicular to the flow direction) of the chute 14, and the waveform obtained by averaging the measurement results of the multiple measuring instruments arranged in the width direction may be applied as the waveform from which the noise components have been removed. Another example is a method of smoothing a single waveform obtained from the first measuring instrument 31 or the second measuring instrument 32 by averaging each measurement result together with several neighboring measurement results, and applying the resulting waveform as the waveform from which the noise components have been removed.

[0074] 2, it is preferable that the first and second measuring instruments 31 and 32 are arranged so that their positions in the width direction perpendicular to the flow direction of the concrete 50 overlap. In this way, the first and second measuring instruments 31 and 32 face the same part of the concrete 50 with a time difference and detect the height of that part. Therefore, the waveform obtained from the measurement results of the first and second measuring instruments 31 and 32 have a waveform shape that is closer to each other. Therefore, it becomes easier to accurately determine the phase difference, and the flow velocity of the concrete 50 can be calculated with higher accuracy.

[0075] In this embodiment, the pouring speed of the concrete 50 is calculated based on the cross-sectional area A of the concrete 50 flowing through the chute 14 and the flow velocity of the concrete 50. At this time, the cross-sectional area A of the concrete 50 (height of the concrete 50) is set to a constant value, and the constant cross-sectional area A (m 2 ) is multiplied by the flow velocity (m / s) of the concrete 50 calculated at each predetermined time ΔT to obtain the pouring speed (m 3 In this case, the pouring speed can be calculated with high accuracy because it is based on the flow velocity (m / s) of the concrete 50 obtained by actually measuring the concrete 50 flowing through the chute 14.

[0076] Preferably, information regarding the height of the concrete 50 flowing through the chute 14 is obtained from the measurement results of at least one of the first measuring instrument 31 and the second measuring instrument 32, and the cross-sectional area A of the concrete 50 is obtained based on the information regarding that height and the cross-sectional shape of the chute 14.

[0077] In this way, the cross-sectional area A of the concrete 50 flowing through the chute 14 is calculated based on the actual height of the concrete 50 flowing through the chute 14, so that the pouring speed of the concrete 50 can be calculated with greater accuracy.

[0078] Furthermore, the results of the measuring instruments 31 and 32 used to calculate the flow velocity of the concrete 50 are used to obtain the cross-sectional area A of the concrete 50 flowing through the chute 14. Therefore, this can be achieved at a lower cost than when a measuring instrument for calculating the flow velocity of the concrete 50 and a measuring instrument for obtaining the cross-sectional area A of the concrete 50 are separately provided.

[0079] More preferably, as information regarding the height of the concrete 50, the average value of the height based on the measurement result of the first measuring instrument 31 at a predetermined time ΔT and the height based on the measurement result of the second measuring instrument 32 at the predetermined time ΔT is obtained every predetermined time ΔT to obtain the cross-sectional area A of the concrete 50 flowing through the chute 14. In this way, the pouring speed of the concrete 50 can be calculated more accurately based on the cross-sectional area A of the concrete 50 that changes every predetermined time ΔT. In addition, by using the average value of the first measuring instrument 31 and the second measuring instrument 32, both the height of the part of the concrete 50 that the first measuring instrument 31 faces and the height of the part of the concrete 50 that the second measuring instrument 32 faces at the predetermined time ΔT are taken into account, so that the pouring speed of the concrete 50 can be calculated more accurately.

[0080] The "predetermined time", which is the time interval for acquiring information regarding the height of the concrete 50, is a short period of time (e.g., 5 seconds, 10 seconds, etc.) that divides the pouring period of the concrete 50. As described above, examples of the pouring period of the concrete 50 include the period required for the concrete 50 to be completely discharged from the ready mixed concrete truck 10 and the period required for the concrete 50 to be completely poured into the target formwork. The predetermined time may be the same as the time interval ΔT for calculating the flow velocity (m / s) of the concrete 50 as described above, or may be different from ΔT. Based on the height information updated at every predetermined time, the cross-sectional area A and the pouring speed may also be updated at every predetermined time.

[0081] Furthermore, examples of the height based on the measurement results of the first measuring instrument 31 and the height based on the measurement results of the second measuring instrument 32 include an average value of the heights (all or part) measured by the measuring instruments 31 and 32 in a predetermined time ΔT, or a predetermined value (maximum value, minimum value, intermediate value between the maximum value and the minimum value, etc.) among the heights measured by the measuring instruments 31 and 32 in the predetermined time ΔT. Alternatively, it may be the height measured by the measuring instruments 31 and 32 at the intermediate time (ΔT / 2) of the predetermined time ΔT.

[0082] Furthermore, the method is not limited to calculating the pouring speed by updating the height and cross-sectional area A of the concrete 50 every predetermined time ΔT as described above. For example, in the early stage of the pouring work, the pouring speed may be calculated by continuing to use the cross-sectional area A based on the height of the concrete 50 obtained from the measurement results of at least one of the first measuring gauge 31 and the second measuring gauge 32.

[0083] Also, the height of concrete 50 at a predetermined time (for example, time t3 in FIG. 8) (for example, the average value of h1(t3) and h2(t3)) may be obtained from at least one of the first noise-removed waveform and the second noise-removed waveform, and the cross-sectional area A of concrete 50 flowing through chute 14 may be obtained based on the height and the cross-sectional shape of chute 14. Then, the pouring speed at the predetermined time (t3) may be calculated sequentially based on the cross-sectional area A and the flow velocity of concrete 50 at the predetermined time (i.e., the flow velocity during a predetermined time ΔT (t0 to t3) which includes time t3). In other words, the predetermined time is a time at each time interval Δt at which the pouring speed is calculated (for example, t2, t3, t4, ... in FIG. 8).

[0084] When a waveform from which noise components have been removed is obtained, the height of the concrete 50 at a given time can be easily obtained using that waveform (using a function formula that represents that waveform). This makes it easier to calculate the pouring speed at shorter time intervals (for example, as shown in FIG. 8, a time interval Δt shorter than the time interval ΔT for calculating the flow velocity of the concrete 50). This makes it possible to calculate a pouring speed with high accuracy that takes into account changes in the height of the concrete 50 in more detail.

[0085] However, without being limited to the above, the cross-sectional area A may be acquired using the measurement result (actual measurement value) before the noise component is removed as information regarding the height of the concrete 50.

[0086] Furthermore, the cross-sectional shape of the chute 14 may change in the flow direction. For example, there may be a chute 14 that tapers toward the downstream side in the flow direction. In such a case, it is advisable to obtain the cross-sectional area A of the concrete 50 based on the cross-sectional shape of the chute 14 at the midpoint between the first measuring gauge 31 and the second measuring gauge 32 in the flow direction. By doing so, the pouring speed can be calculated with greater accuracy.

[0087] ===Second embodiment: Pouring management method=== 11A and 11B are explanatory diagrams of a state in which measuring meters 31, 32 detect aggregate 51A contained in concrete 50. Fig. 12 is a diagram showing specific points PA, PB on the first measured waveform and the second measured waveform.

[0088] In the first embodiment, the phase difference of the waveforms is calculated based on waveforms from which noise components have been removed, but in the second embodiment, the phase difference of the waveforms is calculated based on actually measured waveforms that include noise components.

[0089] For example, when the measuring instrument 31 detects aggregate 51A contained in concrete 50 (aggregate 51A exposed on the surface of concrete 50), the height of concrete 50 at that time increases. Parts of the waveform protrude, as shown at specific points PA and PB in the waveform shown in Fig. 12, and a portion where the waveform exhibits a characteristic change appears. After the first measuring instrument 31 detects a certain aggregate 51A as shown in Fig. 11A, if the second measuring instrument 32 also detects the same aggregate 51A as shown in Fig. 11B, a protruding portion of the same shape appears in the first measured waveform and the second measured waveform.

[0090] Therefore, the control unit of the terminal 40 may identify a specific point PA (a portion showing a characteristic change) of the first measured waveform which is the measurement result of the first measurement instrument 31, and the same specific point PB (a portion showing the same change) of the second measured waveform which is the measurement result of the second measurement instrument 32. Then, the control unit of the terminal 40 calculates the flow velocity of the concrete 50 based on the phase difference at the specific points PA and PB and the installation interval W of the measurement instruments 31 and 32.

[0091] In this case as well, a highly accurate flow velocity of the concrete 50 can be obtained based on the results of actually measuring the concrete 50 flowing through the chute 14. Moreover, in the second embodiment, since the noise removal process is not performed, a faster flow velocity of the concrete 50 can be obtained.

[0092] The terminal 40 may be equipped with an AI function that performs machine learning on the waveform shapes when the measuring instruments 31 and 32 detect the same aggregate. By doing so, the same specific points can be identified with high accuracy from the two waveforms, and the flow velocity of the concrete 50 (phase difference of the waveforms) can be calculated with high accuracy.

[0093] ===Other embodiments=== Although the embodiment of the present invention has been described above, the above embodiment is intended to facilitate understanding of the present invention and is not intended to limit the present invention. Furthermore, the present invention may be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents. For example, the following modifications are possible.

[0094] In the above embodiment, concrete is exemplified as the cement composition, but other cement compositions (for example, mortar, etc.) may also be used.

[0095] In addition, in the above-described embodiment, the flow rate of concrete flowing through the chute 14 of the ready-mix concrete truck 10 was measured, but the measurement is not limited to the chute 14, and similar measurements may be made by pouring concrete into an inclined member. For example, a member having an inclined surface (corresponding to the inclined portion) may be placed between the chute 14 of the ready-mix concrete truck 10 and the hopper 22 of the pump truck 20, and the measuring unit 30 may be provided on the member to measure the flow rate of concrete flowing down the inclined surface.

[0096] In addition, at least two measuring meters (laser displacement meters) need to be arranged at intervals in the flow direction, but three or more measuring meters may be arranged side by side at intervals in the flow direction. In that case, the flow velocity and the like of the concrete 50 can be calculated more accurately based on the phase differences of three or more waveforms and the distances between the measuring meters. [Explanation of symbols]

[0097] 10 ready-mix concrete trucks, 12 drums, 14 chutes, 20 Pump truck, 22 Hopper, 24 Pump, 26 Concrete supply pipe, 30 measuring section, 31 first measuring meter, 32 second measuring meter, 33 first fixture, 34 second fixture, 35 magnet stand, 36 Movable supports; 40 terminals, 50 Concrete, 51 Aggregates,

Claims

1. A waveform acquisition step of acquiring a waveform showing a change in height of the cement composition over time based on the measurement results of a first measuring instrument and a second measuring instrument arranged at a predetermined distance apart in the flow direction of the cement composition flowing through the inclined portion; A velocity calculation step of calculating a velocity of the cement composition flowing through the inclined portion based on a phase difference between the waveform obtained from the measurement result of the first measurement instrument and the waveform obtained from the measurement result of the second measurement instrument, and the predetermined distance; A method for controlling pouring of a cement composition, comprising:

2. A method for managing the placement of a cement composition according to claim 1, A method for managing the pouring of a cement composition, comprising a step of calculating a volumetric flow rate, which is the flow rate of the cement composition flowing through the inclined portion per unit time, based on a cross-sectional area of ​​the cement composition flowing through the inclined portion and the velocity of the cement composition.

3. A method for managing the placement of a cement composition according to claim 2, A method for managing the pouring of a cement composition, comprising a step of acquiring an amount of the cement composition that has flowed down the inclined portion during a predetermined period of time based on the predetermined period of time and the volumetric flow rate during the predetermined period of time.

4. A method for managing the placement of a cement composition according to claim 2 or 3, In the step of calculating the volumetric flow rate, A method for managing the pouring of a cement composition, characterized in that the cross-sectional area of ​​the cement composition flowing down the inclined section is obtained based on information regarding the height of the cement composition flowing down the inclined section obtained from the measurement results of at least one of the first and second measuring instruments, and the cross-sectional shape of the inclined section.

5. A method for managing the placement of a cement composition according to claim 4, A method for managing the pouring of a cement composition, characterized in that the information regarding the height of the cement composition is obtained at each specified time as an average value of the height based on the measurement results of the first measuring instrument at a specified time and the height based on the measurement results of the second measuring instrument at the specified time.

6. A method for managing pouring of a cement composition according to any one of claims 1 to 5, A method for managing the pouring of a cement composition, characterized in that in the waveform acquisition step, a noise component removal process is performed on each of the measurement results of the first measuring instrument and the measurement results of the second measuring instrument, and the phase difference of the waveforms from which the noise components have been removed is obtained.

7. A method for managing the placement of a cement composition according to claim 6, The process of removing noise components involves performing a fast Fourier transform on each of the measurement results from the first and second measuring instruments to obtain peak frequencies, and based on the respective peak frequencies, obtaining a first waveform which corresponds to the measurement result from the first measuring instrument and is the waveform from which the noise components have been removed, and a second waveform which corresponds to the measurement result from the second measuring instrument and is the waveform from which the noise components have been removed.This is a method for managing the pouring of a cement composition, characterized in that

8. A method for managing the placement of a cement composition according to claim 7, A height of the cement composition at a predetermined time is obtained from at least one of the first waveform and the second waveform, and a cross-sectional area of ​​the cement composition flowing through the inclined portion is obtained based on the height and a cross-sectional shape of the inclined portion; A method for managing the pouring of a cement composition, comprising a step of sequentially calculating a volumetric flow rate at a specified time, which is the flow rate of the cement composition flowing through the inclined section per unit time, based on the cross-sectional area and the velocity of the cement composition at the specified time.

9. A method for managing pouring of a cement composition according to any one of claims 1 to 5, A method for managing the pouring of a cement composition, characterized in that the phase difference of the waveform is the phase difference between a specific point of the waveform that is the measurement result of the first measuring instrument and the same specific point of the waveform that is the measurement result of the second measuring instrument.

10. A method for managing pouring of a cement composition according to any one of claims 1 to 9, A method for managing the pouring of a cement composition, characterized in that the first measuring device and the second measuring device are arranged so as to overlap in positions in a direction perpendicular to the flow direction.

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