Method for placing fresh concrete and fresh concrete placing apparatus

Abstract

Provided is a method for placing fresh concrete that enables an operator to visually and easily manage the placement height and placement time of fresh concrete. 【Solution means】In the fresh concrete placement method, (a) a float 12 is suspended from above to a position corresponding to a predetermined placement height from the inner bottom surface 6 of the formwork 4, (b) an operator 42 starts placing fresh concrete, (c) when a sensor 30 detects that the float 12 has floated on the upper surface of the fresh concrete, a light emitting part 22 is caused to emit light based on the detection result of the sensor 30, (d) the operator 42 finishes placing the fresh concrete, (e) the float 12 is raised from the upper surface of the fresh concrete to a position corresponding to a predetermined placement height, (f) when the overall placement height of the fresh concrete has not reached the target placement height, the above steps (b) to (e) are executed again, and (g) when overlapping fresh concrete is placed, the light emitting part 22 is caused to emit light before the count time of a timer 36 reaches a limit time.

Description

Technical Field

[0001] The present invention relates to a method for placing fresh concrete and a fresh concrete placing device.

Background Art

[0002] When placing fresh concrete at a construction site or the like, after workers assemble a formwork with an open top surface, they pour the fresh concrete mixed by an agitator truck (concrete mixer truck) into the inside of the formwork through a hose (see, for example, Patent Document 1).

[0003] Specifically, after workers place the first layer of fresh concrete inside the formwork, before the first layer of fresh concrete coagulates and hardens, they stack the second layer of fresh concrete on top of the first layer of fresh concrete. Thereby, the first layer of fresh concrete and the second layer of fresh concrete are integrated. Similarly hereinafter, by stacking fresh concrete layer by layer inside the formwork, the fresh concrete is placed in multiple layers.

[0004] At this time, in order to integrate the stacked upper and lower layers of fresh concrete, in the Concrete Standard Specification, (i) the placing height of the fresh concrete for each layer is specified as 40 cm to 50 cm, and (ii) the placing time from the completion of the placing of the lower layer of fresh concrete to the completion of the placing of the upper layer of fresh concrete is specified to be within 90 minutes (when the outside air temperature exceeds 25°C).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the conventional method of placing fresh concrete, there is a problem that it is troublesome for workers to manage the placing height and placing time of fresh concrete by themselves.

[0007] The present invention aims to solve the above-described problems, and its object is to provide a fresh concrete placing method and a fresh concrete placing device that enable workers to easily manage the placing height and placing time of fresh concrete visually.

Means for Solving the Problems

[0008] (Technology 1) A fresh concrete placing method for placing fresh concrete inside a formwork with an open top surface, comprising: (a) suspending a float from above to a position corresponding to a predetermined placing height from the inner bottom surface of the formwork; (b) a worker starting to place fresh concrete inside the formwork; (c) when a sensor detects that the float has floated on the upper surface of the fresh concrete placed in (b), based on the detection result of the sensor, causing a light-emitting part to emit light to notify the worker that the placing height of the fresh concrete placed in (b) has reached the predetermined placing height; (d) the worker ending the placing of fresh concrete inside the formwork; (e) using an elevator to raise the float from the upper surface of the fresh concrete placed in (b) to a position corresponding to the predetermined placing height; (f) when the overall placing height of the fresh concrete placed inside the formwork has not reached the target placing height, repeating steps (b) to (e) to stack the fresh concrete; (g) when stacking the fresh concrete in (f), counting the elapsed time since the float was raised to the position corresponding to the predetermined placing height in (e) with a timer, and before the count time of the timer reaches the limit time for stacking the fresh concrete, causing the light-emitting part to emit light to notify the worker to that effect.

[0009] According to Technique 1, when a sensor detects that a float is floating on the upper surface of fresh concrete after an operator starts placing the fresh concrete inside a formwork, a light-emitting unit emits light. Thereby, the operator can visually confirm that the light-emitting unit emits light and determine that the placing height of the fresh concrete has reached a predetermined placing height, and can end the placing of the fresh concrete at an appropriate timing. Therefore, the operator can easily manage the placing height of the fresh concrete visually. Further, when the operator overlays the fresh concrete, the light-emitting unit emits light before the count time of the timer reaches the limit time for overlaying the fresh concrete. Thereby, the operator can visually confirm that the light-emitting unit emits light and determine that the limit time is approaching, and can take measures such as accelerating the overlaying of the fresh concrete. Therefore, the operator can easily manage the placing time of the fresh concrete visually.

[0010] (Technique 2) The method for placing fresh concrete according to Technique 1, wherein in (c), the light-emitting unit emits light in a first emission color, and in (g), the light-emitting unit emits light in a second emission color different from the first emission color.

[0011] According to Technique 2, an operator can more easily manage the placing height and placing time of fresh concrete visually.

[0012] (Technique 3) The method for placing fresh concrete further includes a step of (h) causing the light-emitting unit to emit light in a third emission color different from the first emission color and the second emission color in order to notify the operator to that effect when the count time of the timer reaches the limit time, the method for placing fresh concrete according to Technique 2.

[0013] According to Technique 3, an operator can determine that the count time of the timer has reached the limit time by visually confirming that the light emitting part emits light in the third emission color, and can take measures such as finishing the laying of fresh concrete, for example.

[0014] (Technique 4) In the above (c), when a predetermined time has elapsed after the sensor detects that the float has floated on the upper surface of the fresh concrete placed in the above (b), the light emitting part is turned off, and the fresh concrete placing method according to any one of Techniques 1 to 3.

[0015] According to Technique 4, for example, when the light emitting part is driven by a battery or the like, power saving of the battery or the like can be achieved.

[0016] (Technique 5) The fresh concrete placing method further includes: (i) a step of receiving a detection signal indicating a detection result from the sensor every time fresh concrete is overlaid; and (j) a step of storing information indicating the time when the detection signal is received in the above (i) in a storage unit, and the fresh concrete placing method according to any one of Techniques 1 to 4.

[0017] According to Technique 5, by reading out the information indicating the reception time of the detection signal corresponding to each layer of fresh concrete stored in the storage unit, an operator can confirm, for example, the progress status of the placement of fresh concrete.

[0018] (Technique 6) The elevator has a string-like body with the float attached to the tip, and a rotary drum that can wind up the string-like body on the outer peripheral part and can unwind the string-like body from the outer peripheral part by rotating, and the fresh concrete placing method according to any one of Techniques 1 to 5.

[0019] According to Technique 6, the float can be lifted and lowered with an easy configuration inside the formwork.

[0020] (Technique 7) The method for placing fresh concrete according to Technique 6, wherein the light-emitting part is attached to a position near the float in the string-shaped body.

[0021] According to Technique 7, since workers often place fresh concrete while looking inside the formwork, the light-emitting part is likely to come into the workers' field of vision. Therefore, the workers can easily confirm that the light-emitting part has emitted light.

[0022] (Technique 8) A fresh concrete placing device used for placing fresh concrete inside a formwork with an open top surface in the method for placing fresh concrete described in Technique 1, the fresh concrete placing device including: a float capable of floating on the upper surface of the fresh concrete placed inside the formwork; a sensor for detecting that the float has floated on the upper surface of the fresh concrete placed inside the formwork; a light-emitting part capable of emitting light; a lifter for raising and lowering the float inside the formwork; and a control part for controlling the light-emitting part and the lifter, wherein the control part: (i) when the sensor detects that the float has floated on the upper surface of the fresh concrete as the worker places fresh concrete inside the formwork from a state where the float is suspended from above at a position corresponding to a predetermined placing height from the inner bottom surface of the formwork, causes the light-emitting part to emit light to notify the worker that the placing height of the fresh concrete has reached the predetermined placing height based on the detection result of the sensor; (ii) drives the lifter to raise the float floating on the upper surface of the fresh concrete whose placing height has reached the predetermined placing height to a position corresponding to the predetermined placing height from the upper surface of the fresh concrete; (iii) causes the light-emitting part to emit light to notify the worker to that effect before the elapsed time since the float was raised to the position corresponding to the predetermined placing height reaches a limit time for piling up fresh concrete.

[0023] According to Technique 8, similar to Technique 1, workers can easily manage the placing height and placing time of fresh concrete visually.

Advantages of the Invention

[0024] According to the method for placing fresh concrete and the like according to one aspect of the present invention, workers can easily and visually manage the placing height and placing time of fresh concrete.

Brief Description of the Drawings

[0025]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0026] Hereinafter, the embodiments will be specifically described with reference to the drawings.

[0027] Note that all of the embodiments described below show comprehensive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples and are not intended to limit the scope of the claims. In addition, among the components in the following embodiments, the components not described in the independent claims indicating the most general concept are described as optional components.

[0028] Also, each figure is not necessarily drawn precisely. In each figure, substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted or simplified.

[0029] (Embodiment) [1. Overall Configuration of Fresh Concrete Placing Device] First, with reference to FIG. 1, the overall configuration of the fresh concrete placing device 2 according to the embodiment will be described. FIG. 1 is a diagram schematically showing the appearance of the fresh concrete placing device 2 according to the embodiment.

[0030] In the following description, the Z-axis direction in FIG. 1 is defined as the vertical direction (up and down direction), the plus side of the Z-axis is defined as "up", and the minus side of the Z-axis is defined as "down".

[0031] The fresh concrete placing device 2 is a device used, for example, at a construction site or the like, to place fresh concrete in multiple layers by stacking fresh concrete layer by layer inside the formwork 4. Note that the formwork 4 is assembled at the place where fresh concrete is to be placed. As shown in FIG. 1, the upper surface of the formwork 4 is open, and the inner bottom surface 6 (lower surface) of the formwork 4 is closed.

[0032] As shown in FIG. 1, the fresh concrete placing device 2 includes an elevator 8, a main body unit 10, and a float 12.

[0033] The elevator 8 is a mechanism for raising and lowering the float 12 inside the formwork 4. The elevator 8 has a rotating drum 14, a motor 16, and a string-like body 18.

[0034] The rotary drum 14 is formed in a substantially cylindrical shape and is rotatably supported above the mold 4.

[0035] The motor 16 is, for example, a servo motor that can rotate in the forward and reverse directions, and transmits a rotational driving force to the rotary drum 14. When the rotational driving force from the motor 16 is transmitted to the rotary drum 14, the rotary drum 14 rotates in the unwinding direction (the direction indicated by arrow P in FIG. 1) and the winding direction (the direction indicated by arrow Q in FIG. 1).

[0036] The string-like body 18 is a flexible string-like member, for example, composed of a wire rope or the like. The string-like body 18 is wound around the outer peripheral portion of the rotary drum 14, and the tip end portion of the string-like body 18 hangs down along the vertical direction (Z-axis direction) from the rotary drum 14 toward the inner bottom surface 6 of the mold 4. When the rotary drum 14 rotates in the unwinding direction, the string-like body 18 is unwound from the rotary drum 14. On the other hand, when the rotary drum 14 rotates in the winding direction, the string-like body 18 is wound around the rotary drum 14.

[0037] The main body unit 10 is attached to the tip end portion of the string-like body 18. The main body unit 10 has a housing 20 and a light emitting unit 22. In this embodiment, the housing 20 and the light emitting unit 22 are integrally formed.

[0038] The housing 20 is formed, for example, in a substantially cylindrical shape with a hollow interior. The lower end portion of the housing 20 (the end portion far from the rotary drum 14) is connected to the float 12 via a flexible power cable 24. Inside the housing 20, a control board 26 is accommodated. The control board 26 is electrically connected to the light emitting unit 22 and is also electrically connected to a sensor 30 (described later) via the power cable 24. Further, the control board 26 can communicate wirelessly with the elevator 8. The control board 26 controls the light emitting unit 22 and the elevator 8 based on a first detection signal and a second detection signal (described later) from the sensor 30.

[0039] The light emitting unit 22 is formed, for example, in a substantially cylindrical shape, and is disposed adjacent to the upper end portion of the housing 20 (the end portion closer to the rotary drum 14). That is, the light emitting unit 22 is attached to a position near the float 12 in the string-like body 18. The light emitting unit 22 includes, for example, a light emitting diode and a diffusion member for diffusing the light from the light emitting diode. The light emitting diode is a multi-color light emitting diode capable of switching the emission colors to three different colors, for example, green (an example of the first emission color), yellow (an example of the second emission color), and red (an example of the third emission color).

[0040] The float 12 is formed, for example, in a hollow rotating ellipsoidal shape, and is attached to the tip of the string-like body 18 via the main body unit 10. Specifically, the float 12 is suspended from the lower end portion of the housing 20 via the power cable 24. At this time, the major axis 28 of the ellipse in the cross section of the float 12 (indicated by a dashed line in FIG. 1) extends along the longitudinal direction of the power cable 24.

[0041] The float 12 moves up and down inside the formwork 4 by the elevator 8 described above. Specifically, when the rotary drum 14 rotates in the unwinding direction, the string-like body 18 is unwound from the outer peripheral portion of the rotary drum 14, so that the float 12 descends in a direction approaching the inner bottom surface 6 of the formwork 4 (the direction indicated by arrow U in FIG. 1). On the other hand, when the rotary drum 14 rotates in the winding direction, the string-like body 18 is wound around the outer peripheral portion of the rotary drum 14, so that the float 12 ascends in a direction away from the inner bottom surface 6 of the formwork 4 (the direction indicated by arrow V in FIG. 1).

[0042] In addition, since the specific gravity of the float 12 is configured to be smaller than the specific gravity of the fresh concrete, the float 12 can float on the upper surface (surface) of the fresh concrete placed inside the formwork 4. When the float 12 is not floating on the upper surface of the fresh concrete, the major axis 28 of the ellipse in the cross section of the float 12 is substantially parallel to the vertical direction. On the other hand, when the float 12 is floating on the upper surface of the fresh concrete, the major axis of the ellipse in the cross section of the float is inclined with respect to the vertical direction.

[0043] Inside the float 12, a sensor 30 is accommodated. The sensor 30 is a sensor for detecting whether the float 12 is floating on the upper surface of the fresh concrete placed inside the formwork 4, and is composed of, for example, an inclinometer or the like.

[0044] The sensor 30 detects that the float 12 is floating on the upper surface of the fresh concrete placed inside the formwork 4 when, for example, the major axis 28 of the ellipse in the cross-section of the float 12 is inclined with respect to the vertical direction. When the sensor 30 detects that the float 12 is floating on the upper surface of the fresh concrete placed inside the formwork 4, the sensor 30 outputs a first detection signal indicating that fact to the main body unit 10 via the power cable 24.

[0045] Further, after outputting the first detection signal, the sensor 30 detects that the float 12 is not floating on the upper surface of the fresh concrete placed inside the formwork 4 when, for example, the major axis 28 of the ellipse in the cross-section of the float 12 becomes substantially parallel to the vertical direction. When the sensor 30 detects that the float 12 is not floating on the upper surface of the fresh concrete placed inside the formwork 4, the sensor 30 outputs a second detection signal indicating that fact to the main body unit 10 via the power cable 24.

[0046] [2. Functional Configuration of Fresh Concrete Placing Device] Next, with reference to FIG. 2, the functional configuration of the fresh concrete placing device 2 according to the embodiment will be described. FIG. 2 is a block diagram showing the functional configuration of the fresh concrete placing device 2 according to the embodiment.

[0047] As shown in Fig. 2, the float 12 has a sensor 30. When the sensor 30 detects that the float 12 is floating on the upper surface of the fresh concrete placed inside the formwork 4, it outputs a first detection signal indicating this to the main body unit 10. Also, after outputting the first detection signal, when the sensor 30 detects that the float 12 is not floating on the surface of the fresh concrete placed inside the formwork 4, it outputs a second detection signal indicating this to the main body unit 10.

[0048] The main body unit 10 has a communication unit 32, a control unit 34, a timer 36, and a light emitting unit 22. Note that the communication unit 32, the control unit 34, and the timer 36 are realized by the above-described control board 26.

[0049] The communication unit 32 receives the first detection signal and the second detection signal from the sensor 30, and outputs the received first detection signal and second detection signal to the control unit 34. Also, the communication unit 32 can perform wireless communication with the elevator 8, and transmits a drive control signal (described later) from the control unit 34 to the elevator 8. Note that the communication unit 32 may perform wireless communication with the elevator 8 according to a wireless communication standard such as BLE (Bluetooth (registered trademark) Low Energy).

[0050] The control unit 34 controls the light emitting unit 22 and the elevator 8 based on the first detection signal from the communication unit 32. Specifically, when the control unit 34 receives the first detection signal from the communication unit 32, it determines that the float 12 is floating on the upper surface of the fresh concrete placed at a predetermined placing height (for example, about 45 cm) inside the formwork 4. Accordingly, the control unit 34 controls the light emitting unit 22 to blink (emit light) in green, and instructs the timer 36 to start counting for a predetermined time (for example, 20 seconds). Here, the reason for blinking the light emitting unit 22 in green is to notify the operator that the placing height of the fresh concrete has reached the predetermined placing height. Note that the "predetermined placing height" is the placing height of the fresh concrete for each layer defined in the concrete standard specification, and is 40 cm to 50 cm. In the present embodiment, the predetermined placing height is set to about 45 cm.

[0051] Further, when the timer 36 counts a predetermined time, the control unit 34 controls (i) to turn off the light emitting unit 22, and (ii) transmits a drive control signal for instructing the elevator 8 to raise the float 12 from the upper surface of the fresh concrete to a position corresponding to a predetermined placing height via the communication unit 32.

[0052] Also, when the control unit 34 receives the second detection signal from the communication unit 32, it determines that the float 12 is not floating on the upper surface of the fresh concrete placed inside the formwork 4 (that is, the float 12 is hanging down from the main body unit 10). Accordingly, the control unit 34 instructs the timer 36 to start counting a limit time (for example, 90 minutes). Here, the "limit time" is the placing time defined in the Concrete Standard Specification from the completion of the placing of the lower layer of fresh concrete to the completion of the placing (layering) of the upper layer of fresh concrete, which is 90 minutes when the outside air temperature exceeds 25°C and 120 minutes when the outside air temperature is 25°C or lower. In the present embodiment, the limit time is set to 90 minutes.

[0053] The control unit 34 controls the light emitting unit 22 to blink (emit light) in yellow at the timing when the count time of the timer 36 reaches just before the limit time (for example, 10 minutes before). Here, the reason for blinking the light emitting unit 22 in yellow is to notify the operator that the elapsed time since the completion of the placing of the lower layer of fresh concrete is approaching the limit time.

[0054] Also, when the count time of the timer 36 reaches the limit time, the control unit 34 controls the light emitting unit 22 to blink (emit light) in red. Here, the reason for blinking the light emitting unit 22 in red is to notify the operator that the elapsed time since the completion of the placing of the lower layer of fresh concrete has reached the limit time.

[0055] The elevator 8 includes a communication unit 38, a motor control unit 40, and a motor 16.

[0056] The communication unit 38 can communicate wirelessly with the main body unit 10. The communication unit 38 receives the drive control signal transmitted from the main body unit 10 and outputs the received drive control signal to the motor control unit 40. Note that the communication unit 38 may communicate wirelessly with the main body unit 10 according to a wireless communication standard such as BLE or the like.

[0057] The motor control unit 40 controls the driving of the motor 16 based on the drive control signal from the communication unit 38. Specifically, when the motor control unit 40 receives the drive control signal from the communication unit 38, it controls the rotation amount and rotation direction of the motor 16 so as to raise the float 12 from the upper surface of the fresh concrete to a position corresponding to a predetermined placing height.

[0058] [3. Operation of Fresh Concrete Placing Device] Next, with reference to FIGS. 3 to 9, the operation of the fresh concrete placing device 2 according to the embodiment will be described. FIG. 3 is a flowchart showing the operation flow of the fresh concrete placing device 2 according to the embodiment. FIG. 4 is a diagram for explaining the contents of steps S101 and S102 of the flowchart of FIG. 3. FIG. 5 is a diagram for explaining the contents of steps S104 and S105 of the flowchart of FIG. 3. FIG. 6 is a diagram for explaining the contents of steps S107 and S108 of the flowchart of FIG. 3. FIG. 7 is a diagram for explaining the content of step S113 of the flowchart of FIG. 3. FIG. 8 is a diagram for explaining the content of step S115 of the flowchart of FIG. 3. FIG. 9 is a diagram for explaining the contents of steps S117 and S118 of the flowchart of FIG. 3.

[0059] Hereinafter, a case where the worker 42 places multiple layers (that is, a placing height of 2H or more) of fresh concrete by stacking fresh concrete layer by layer inside the formwork 4 will be described. Note that the worker 42 pre-assembles the formwork 4 at a place where fresh concrete is to be placed at a construction site or the like.

[0060] As shown in FIGS. 3 and 4, first, an operator 42 outside the formwork 4 suspends the float 12 from above to a position corresponding to a predetermined placing height H (for example, about 45 cm) from the inner bottom surface 6 of the formwork 4 (S101). At this time, the light emitting part 22 is turned off. When the operator 42 suspends the float 12 at the above position, the motor 16 may be driven by a remote control or the like, or the rotary drum 14 may be rotated manually. Alternatively, the main body unit 10 may control the elevator 8 so that the float 12 descends to the above position.

[0061] Next, as shown in FIG. 4, the operator 42 starts placing the first layer of fresh concrete by pouring the fresh concrete mixed by, for example, an agitator truck (not shown) into the formwork 4 from the upper surface of the formwork 4 through the hose 44 (S102). Thereby, the fresh concrete is gradually deposited on the inner bottom surface 6 of the formwork 4.

[0062] If the placing height of the first layer of fresh concrete is less than the predetermined placing height H and the sensor 30 has not detected that the float 12 has floated on the upper surface of the fresh concrete placed inside the formwork 4 (NO in S103), the light emitting part 22 remains turned off. The operator 42 visually confirms that the light emitting part 22 remains turned off, determines that the placing height of the first layer of fresh concrete is less than the predetermined placing height H, and continues to place the first layer of fresh concrete. Thereafter, step S103 is executed again.

[0063] On the other hand, as shown in FIG. 5, when the placing height of the first layer of fresh concrete reaches the predetermined placing height H and the sensor 30 detects that the float 12 has floated on the upper surface of the first layer of fresh concrete placed inside the formwork 4 (YES in S103), the sensor 30 outputs a first detection signal to the main body unit 10.

[0064] Next, based on the first detection signal from the sensor 30, the control unit 34 of the main body unit 10 determines that the float 12 is floating on the upper surface of the first layer of fresh concrete placed at the predetermined placing height H. Then, the control unit 34 controls the light emitting unit 22 to blink in green (S104), and instructs the timer 36 to start counting for a predetermined time (for example, 20 seconds).

[0065] The operator 42 visually confirms that the light emitting unit 22 is blinking in green, determines that the placing height of the first layer of fresh concrete has reached the predetermined placing height H, and ends the placing of the first layer of fresh concrete (S105).

[0066] If the predetermined time has not elapsed (NO in S106), the light emitting unit 22 continues to blink in green, and step S106 is executed again.

[0067] After that, when the predetermined time has elapsed (YES in S106), the control unit 34 controls the light emitting unit 22 to turn off (S107). Next, the control unit 34 transmits a drive control signal to the elevator 8 via the communication unit 32. As a result, as shown in FIG. 6, the motor control unit 40 of the elevator 8 controls the drive of the motor 16 to raise the float 12 from the upper surface of the first layer of fresh concrete to a position corresponding to the predetermined placing height H based on the drive control signal from the main body unit 10 (S108).

[0068] At this time, when the sensor 30 detects that the float 12 is not floating on the surface of the fresh concrete placed inside the formwork 4, the sensor 30 outputs a second detection signal to the main body unit 10. Then, based on the second detection signal from the sensor 30, the control unit 34 of the main body unit 10 instructs the timer 36 to start counting for a limited time (for example, 90 minutes) (S109).

[0069] Next, the worker 42 starts placing the fresh concrete for the second layer (S110). As a result, the fresh concrete for the second layer is placed while being gradually deposited on the fresh concrete for the first layer and is overlaid.

[0070] If the placing height of the fresh concrete for the second layer is less than the predetermined placing height H and the sensor 30 has not detected that the float 12 has floated on the upper surface of the fresh concrete for the second layer placed inside the formwork 4 (NO in S111), the light emitting unit 22 remains turned off. By visually confirming that the light emitting unit 22 remains turned off, the worker 42 determines that the placing height of the fresh concrete for the second layer is less than the predetermined placing height H, and the worker 42 continues to place the fresh concrete for the second layer.

[0071] When the count time of the timer 36 reaches just before the limit time (for example, 10 minutes before) (YES in S112), as shown in FIG. 7, the control unit 34 controls the light emitting unit 22 to blink in yellow (S113). By visually confirming that the light emitting unit 22 is blinking in yellow, the worker 42 determines that the elapsed time since the placing of the fresh concrete for the first layer was completed is approaching the limit time, and takes measures such as expediting the placing of the fresh concrete for the second layer.

[0072] Thereafter, when the count time of the timer 36 reaches the limit time (YES in S114), as shown in FIG. 8, the light emitting unit 22 is controlled to blink in red (S115). By visually confirming that the light emitting unit 22 is blinking in red, the worker 42 determines that the elapsed time since the placing of the fresh concrete for the first layer was completed has reached the limit time. In this case, the worker 42 takes measures such as ending the placing of the fresh concrete for the second layer. Thereafter, the process of the flowchart in FIG. 3 ends.

[0073] On the one hand, as shown in FIG. 9, before the count time of the timer 36 reaches just before the limit time (NO in S112, NO in S114), or before the count time of the timer 36 reaches the limit time after step S113 (NO in S114), if the placing height of the second layer of fresh concrete reaches the predetermined placing height H, the process proceeds from step S114 to step S111. In this case, it is detected by the sensor 30 that the float 12 floats on the upper surface of the second layer of fresh concrete placed inside the formwork 4 (YES in S111), and the sensor 30 outputs a first detection signal to the main body unit 10.

[0074] Next, the control unit 34 of the main body unit 10 determines, based on the first detection signal from the sensor 30, that the float 12 floats on the upper surface of the second layer of fresh concrete placed at the predetermined placing height H. Then, the control unit 34 instructs the timer 36 to reset the count of the limit time (S116), and controls the light emitting unit 22 to blink in green (S117). Also, the control unit 34 instructs the timer 36 to start counting for a predetermined time (for example, 20 seconds).

[0075] The operator 42 visually confirms that the light emitting unit 22 is blinking green, determines that the placing height of the second layer of fresh concrete has reached the predetermined placing height H, and ends the placing of the second layer of fresh concrete (S118).

[0076] If the predetermined time has not elapsed (NO in S119), the light emitting unit 22 continues to blink green, and step S119 is executed again.

[0077] Thereafter, when a predetermined time has elapsed (YES in S119), the control unit 34 controls to turn off the light emitting unit 22 (S120). Next, the control unit 34 transmits a drive control signal to the elevator 8 via the communication unit 32. As a result, the motor control unit 40 of the elevator 8 controls the drive of the motor 16 to raise the float 12 from the upper surface of the fresh concrete on the second layer to a position corresponding to a predetermined placing height H (S121).

[0078] If the entire placing height of the fresh concrete placed inside the formwork 4 has not reached the target placing height (for example, the target placing height 20H) (NO in S122), the above-described steps S109 to SS121 are executed again. Then, the fresh concrete is repeatedly placed in the same manner as described above until the entire placing height of the fresh concrete placed inside the formwork 4 reaches the target placing height.

[0079] If the entire placing height of the fresh concrete placed inside the formwork 4 has reached the target placing height (YES in S122), the process of the flowchart in FIG. 3 is terminated.

[0080] [4. Effects] As described above, in the fresh concrete placing device 2 according to the embodiment, after the operator 42 starts placing the fresh concrete inside the formwork 4, when the sensor 30 detects that the float 12 has floated on the upper surface of the fresh concrete, the light emitting unit 22 is caused to emit light. As a result, the operator 42 can visually confirm that the light emitting unit 22 has emitted light and thereby determine that the placing height of the fresh concrete has reached the predetermined placing height H, and can end the placing of the fresh concrete at an appropriate timing. Therefore, the operator 42 can easily manage the placing height of the fresh concrete visually.

[0081] In addition, in the fresh concrete placing device 2 according to the embodiment, when the worker 42 stacks fresh concrete, the light emitting unit 22 is caused to emit light before the count time of the timer 36 reaches the limit time for stacking fresh concrete. As a result, the worker 42 can visually confirm that the light emitting unit 22 has emitted light, and thereby can determine that the limit time is approaching, and can take measures such as accelerating the stacking of fresh concrete, for example. Therefore, the worker 42 can easily manage the placing time of fresh concrete visually.

[0082] (Modifications, etc.) As described above, the fresh concrete placing method and the fresh concrete placing device according to one or more aspects of the present invention have been described based on the above embodiments. However, the present invention is not limited to the above embodiments. As long as the gist of the present invention is not deviated from, various modifications conceived by those skilled in the art applied to the present embodiment, or forms constructed by combining components in different embodiments may also be included within the scope of one or more aspects of the present invention.

[0083] In the above embodiment, the main body unit 10 is configured to receive the first detection signal and the second detection signal from the sensor 30. However, each time fresh concrete is stacked layer by layer, information indicating the reception times of the first detection signal and / or the second detection signal may be stored in a storage unit (not shown). In this case, the main body unit 10 may be configured to read out, for example, in response to a request from the worker 42, information indicating the reception times of the first detection signal and / or the second detection signal corresponding to each layer of fresh concrete stored in the storage unit. Thereby, the worker 42 can confirm, for example, the progress status of the placement of fresh concrete based on the information read out by the main body unit 10.

[0084] In addition, in the above embodiment, the float 12 and the light emitting unit 22 are configured as separate bodies, but the present invention is not limited to this, and they may be integrally configured.

[0085] In the above-described embodiment, the light-emitting unit 22 is caused to blink, but the present invention is not limited to this, and the light-emitting unit 22 may be continuously lit.

[0086] In the above-described embodiment, the main body unit 10 and the elevator 8 communicate wirelessly, but the present invention is not limited to this, and the main body unit 10 and the elevator 8 may communicate by wire. In this case, for example, the string-like body 18 may be constituted by a captive cable, and the main body unit 10 and the elevator 8 may be electrically connected via the captive cable.

[0087] In the above-described embodiment, the light-emitting unit 22 is caused to blink in yellow at the timing when the count time of the timer 36 reaches 10 minutes before the limit time, but the present invention is not limited to this, and for example, the light-emitting unit 22 may be caused to blink in yellow at the timing when it reaches an arbitrary time before the limit time, such as 5 minutes before the limit time.

[0088] Further, a display unit such as a liquid crystal panel or the like may be arranged on the elevator 8, and the remaining time until the limit time, the count time of the timer 36, or the like may be displayed on the display unit. Thereby, the worker 42 can adjust the progress of the work of stacking fresh concrete by visually checking the time displayed on the display unit.

Industrial Applicability

[0089] The present invention can be applied, for example, as a method for placing fresh concrete at a construction site or the like.

Explanation of Reference Numerals

[0090] 2 Fresh concrete placing device 4 Formwork 6 Inner bottom surface 8 Elevator 10 Main body unit 12 Float 14 Rotating drum 16 Motor 18 String-like body 20 Housing 22 Light-emitting unit 24 Power cable 26 Control board 28 Long axis 30 Sensor 32, 38 Communication unit 34 Control unit 36 Timer 40 Motor control unit 42 Operator 44 Hose

Claims

1. A method for pouring ready-mixed concrete into a formwork having an open top, comprising: (a) suspending a float from above at a position corresponding to a predetermined pouring height from the inner bottom surface of the formwork; (b) a worker starts pouring fresh concrete into the formwork; (c) when a sensor detects that the float has risen to the top surface of the ready-mixed concrete poured in (b), illuminating the light-emitting unit to notify the worker that the pouring height of the ready-mixed concrete poured in (b) has reached the predetermined pouring height based on the detection result of the sensor; (d) the worker finishes pouring the fresh concrete into the formwork; (e) using an elevator, the float is raised from the top surface of the fresh concrete poured in (b) to a position corresponding to the predetermined pouring height; (f) if the total pouring height of the fresh concrete poured inside the formwork does not reach the target pouring height, pouring the fresh concrete again by executing (b) to (e); (g) when pouring fresh concrete in (f), counting the elapsed time from when the float is raised to a position corresponding to the predetermined pouring height in (e) with a timer, and before the count time of the timer reaches a time limit for pouring the fresh concrete, causing the light emitting unit to emit light to notify the worker of that fact. How to pour ready mixed concrete.

2. In the step (c), the light emitting unit is caused to emit light of a first emission color; In the step (g), the light emitting unit is caused to emit light in a second light emitting color different from the first light emitting color. The method for pouring ready mixed concrete according to claim 1.

3. The ready-mixed concrete pouring method further comprises: (h) when the count time of the timer reaches the time limit, causing the light emitting unit to emit light in a third light color different from the first light color and the second light color in order to notify the worker of the time limit. The ready-mixed concrete pouring method according to claim 2.

4. In the step (c), when a predetermined time has elapsed since the sensor detected that the float has floated on the top surface of the ready-mixed concrete poured in the step (b), the light-emitting unit is turned off. The ready-mixed concrete pouring method according to any one of claims 1 to 3.

5. The ready-mixed concrete pouring method further comprises: (i) receiving a detection signal indicating a detection result from the sensor each time fresh concrete is poured; (j) storing information indicating the time when the detection signal was received in (i) in a storage unit. The ready-mixed concrete pouring method according to any one of claims 1 to 3.

6. The elevator is A string-like body having the float attached to a tip end thereof; and a rotating drum that, by rotating, can wind the string-like body around its outer periphery and can unwind the string-like body from the outer periphery. The method for pouring ready mixed concrete according to claim 1.

7. The light emitting portion is attached to the string at a position near the float. The ready-mixed concrete pouring method according to claim 6.

8. The ready-mixed concrete pouring method according to claim 1, wherein the ready-mixed concrete pouring device is used for pouring ready-mixed concrete into a formwork having an open upper surface, A float capable of floating on the top surface of the fresh concrete poured inside the formwork; A sensor for detecting that the float has floated on the top surface of the fresh concrete poured inside the formwork; A light-emitting unit capable of emitting light; an elevator for raising and lowering the float inside the formwork; a control unit that controls the light emitting unit and the elevator, The control unit is (i) when a worker pours fresh concrete into the formwork from a state in which the float is suspended from above at a position corresponding to a predetermined pouring height from the inner bottom surface of the formwork, and the sensor detects that the float has floated to the top surface of the fresh concrete, the light-emitting unit is caused to emit light to notify the worker that the pouring height of the fresh concrete has reached the predetermined pouring height based on the detection result of the sensor; (ii) Driving the elevator so as to raise the float floating on the top surface of the fresh concrete whose pouring height has reached the predetermined pouring height from the top surface of the fresh concrete to a position corresponding to the predetermined pouring height; (iii) before the elapsed time from when the float is raised to a position corresponding to the predetermined pouring height reaches a time limit for pouring fresh concrete, the light-emitting unit is caused to emit light to notify the worker of that fact. Ready-mixed concrete pouring equipment.

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