Drop height measuring device, drop height management system, and construction method for concrete members

Abstract

To provide a drop height measurement device in which the structure thereof is simplified.SOLUTION: A drop height measurement device 30 comprises a placing hose 32 that discharges ready-mixed concrete 22 from a tip opening 32A, and a laser range finder 60 that is attached to a tip side of the placing hose 32 and that measures the distance to a given location where the ready-mixed concrete 22 discharged from the tip opening 32A drops.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a falling height measuring device, a falling height management system, and a method for constructing a concrete member.

Background Art

[0002] There is a placing management device including a placing pipe that moves vertically and discharges fresh concrete from its lower end, a pipe connected to the placing pipe that supplies fresh concrete to the placing pipe, and a calculating means for calculating the falling height of the fresh concrete placed from the lower end of the placing pipe (see, for example, Patent Document 1).

[0003] In the placing management device disclosed in Patent Document 1, by calculating the falling height of the fresh concrete placed from the lower end of the placing pipe by the calculating means, the falling height of the fresh concrete can be made within a predetermined value.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the placing management device disclosed in Patent Document 1, since it includes a placing pipe that moves vertically with respect to the pipe, the structure of the placing management device becomes complicated.

[0006] In consideration of the above facts, an object of the present invention is to simplify the structure of the falling height measuring device.

Means for Solving the Problems

[0007] Regarding the first aspectThe drop height measuring device comprises a concrete pouring hose that discharges ready-mixed concrete from its tip opening, and a laser distance meter attached to the tip of the concrete pouring hose, which measures the distance to a predetermined position where the ready-mixed concrete discharged from the tip opening falls.

[0008] First aspect According to the drop height measuring device, the concrete pouring hose discharges ready-mix concrete from its tip opening. A laser distance meter is attached to the tip of this concrete pouring hose.

[0009] Here, the laser distance meter measures the distance from the tip opening of the concrete pouring hose to a predetermined position where the fresh concrete falls (hereinafter referred to as the "fall height"). This makes it easy to keep the fall height of the fresh concrete below a predetermined value. As a result, material segregation of the fresh concrete due to falling is suppressed, thus preventing deterioration of the concrete's quality.

[0010] Furthermore, by attaching a laser distance meter to the tip of the concrete pouring hose, the drop height of the ready-mix concrete can be measured directly. Therefore, the configuration of the drop height measuring device can be simplified.

[0011] Furthermore, in this invention, the height at which the ready-mixed concrete falls can be measured on-site during the concrete pouring process.

[0012] Regarding the second aspect The drop height measuring device is Regarding the first aspect The fall height measuring device includes a case that houses the laser distance meter, which is attached to the outer surface of the tip end of the pouring hose, whose cross-section has been deformed, or is housed inside the tip end of the pouring hose, leaving the tip opening intact.

[0013] Second aspectAccording to the fall height management device described herein, the case is attached to the outer surface of the tip end of the pouring hose, whose cross-section is deformed, or is stored inside the tip end of the pouring hose, leaving the tip opening intact. By housing the laser distance meter in this case, the tip end of the pouring hose can be made more compact compared to the case where the laser distance meter is attached to the outer surface of the pouring hose, which does not deform in cross-section.

[0014] Therefore, for example, the tip (case) of the concrete pouring hose can be inserted into gaps in reinforcing bars, thus improving workability.

[0015] Furthermore, housing the laser rangefinder in a case enhances its durability and suppresses the decline in measurement accuracy due to contamination and other factors.

[0016] Regarding the third aspect The drop height measuring device is Regarding the second aspect In the fall height measuring device, the laser distance meter is housed in a retractable manner within the case.

[0017] Third aspect According to the fall height management device, the maintainability of the laser rangefinder is improved by housing the laser rangefinder in a retractable case.

[0018] Regarding the fourth aspect The fall height management system is First aspect ~ Third aspect one of the following related to The system comprises a fall height measuring device, a notification means for providing notification, and a control device that causes the notification means to provide notification based on the distance measured by the laser rangefinder.

[0019] Fourth aspect According to the fall height management system, the control device notifies the notification means based on the distance measured by the laser rangefinder. This allows workers to be notified when the fall height of the ready-mix concrete is below a predetermined value. Therefore, the fall height of the ready-mix concrete can be easily managed.

[0020] Regarding the fifth aspect The construction method of the concrete member is a construction method of the concrete member for constructing the concrete member by discharging fresh concrete from the tip opening of the placing hose, and the distance to a predetermined position where the fresh concrete discharged from the tip opening falls is measured by a laser distance meter attached to the tip side of the placing hose.

[0021] Fifth aspect According to the construction method of the concrete member according to the present invention, the distance (falling height) to a predetermined position where the fresh concrete discharged from the tip opening of the placing hose falls is measured by a laser distance meter attached to the tip side of the placing hose.

[0022] Thereby, the falling height of the fresh concrete can be easily made below a predetermined value. As a result, since material separation of the fresh concrete due to falling is suppressed, deterioration of the quality of the concrete is suppressed.

[0023] In addition, by attaching a laser distance meter to the tip side of the placing hose, the falling height of the fresh concrete can be directly measured. Therefore, the configuration of the falling height measuring device can be simplified.

[0024] Furthermore, in the present invention, at the time of placing the fresh concrete, the falling height of the fresh concrete can be measured on the spot.

[0025] Regarding the sixth aspect The construction method of the concrete member is Regarding the fifth aspect In the construction method of the concrete member, when the distance measured by the laser distance meter is below a predetermined value, a notification means gives a notification. Co

[0026] Sixth aspectAccording to the construction method for concrete members, a notification device issues a notification when the distance measured by a laser distance meter is below a predetermined value. This allows workers to be aware that the height at which the ready-mix concrete falls is below a predetermined value. Therefore, the height at which the ready-mix concrete falls can be easily managed. [Effects of the Invention]

[0027] As described above, the present invention makes it possible to simplify the structure of the fall height measuring device. [Brief explanation of the drawing]

[0028] [Figure 1] This is a system configuration diagram of a fall height management system according to one embodiment. [Figure 2] This is an elevation view showing a fall height measuring device according to one embodiment. [Figure 3] Figure 2 is a perspective view showing the drop height measuring device. [Figure 4] Figure 2 is a cross-sectional view showing the drop height measuring device. [Figure 5] (A) is a disassembled cross-sectional view of the concrete pouring hose and case shown in Figure 4, and (B) is a cross-sectional view showing the concrete pouring hose and case shown in Figure 4 assembled. [Figure 6] This is a cross-sectional view taken along line 6-6 in Figure 4. [Figure 7] This is a cross-sectional view taken along line 7-7 in Figure 4. [Figure 8] This is a cross-sectional view corresponding to Figure 7, which shows the tray pulled out of the case. [Figure 9] This is a flowchart of the fall height management process according to one embodiment. [Modes for carrying out the invention]

[0029] An embodiment will be described below with reference to the drawings.

[0030] (Fall height management system) Figure 1 shows the system configuration of the drop height management system 10 according to this embodiment. The drop height management system 10 is a system that manages the drop height of ready-mixed concrete 22 discharged from a concrete pouring hose 32 (see Figure 2). This drop height management system 10 includes a drop height measuring device 30, a control device 80, and an alarm lamp 90.

[0031] (Fall height measuring device) As shown in Figure 2, the drop height measuring device 30 is a device for measuring the distance (drop height H) to a predetermined position where the fresh concrete 22 will fall. The drop height measuring device 30 according to this embodiment will be described below using the construction of a reinforced concrete wall (hereinafter referred to as "RC wall 20") as an example. Note that the RC wall 20 is an example of a concrete member.

[0032] The RC wall 20 comprises concrete (not shown) formed by hardening ready-mix concrete 22, and multiple vertical reinforcements 24 and horizontal reinforcements 26 embedded in the concrete. During the construction of this RC wall 20, for example, a pair of formwork 27 is temporarily erected on a structural frame 28 such as a slab or beam. The pair of formwork 27 is positioned facing each other in the thickness direction of the RC wall 20. In addition, multiple vertical reinforcements 24 and horizontal reinforcements 26 are arranged inside the pair of formwork 27.

[0033] The drop height measuring device 30 includes a concrete pouring hose 32, a case 40 (see Figure 3), and a laser distance meter 60.

[0034] (Hose for concrete pouring) The concrete pouring hose 32 is a tip hose that is detachably connected to the main hose of a concrete pump truck (not shown). Ready-mix concrete 22, pumped by the pumping device of the concrete pump truck, is supplied to this concrete pouring hose 32 via the main hose. The ready-mix concrete 22 supplied to the concrete pouring hose 32 is discharged into a pair of formwork 27 from the tip opening 32A of the concrete pouring hose 32.

[0035] The concrete pouring hose 32 is held by worker W, and the pouring position and drop height of the ready-mixed concrete 22 are adjusted as needed.

[0036] (case) As shown in Figure 3, a case 40 is attached to the outer surface of the tip end of the concrete pouring hose 32. As shown in Figure 4, the tip end of the concrete pouring hose 32 is compressed radially by the case 40, and its cross-sectional shape is deformed from a circular shape to a crescent shape. In addition, a concave portion 34 is formed on the outer surface of the concrete pouring hose 32 on the case 40 side.

[0037] As shown in Figures 5(A) and 5(B), the cross-sectional shape of the case 40 is formed in a semi-circular shape to compensate for the cross-section of the tip end of the crushed concrete pouring hose 32. Together with the tip end of the concrete pouring hose 32, a circular cross-section is formed.

[0038] As shown in Figure 4, the case 40 is formed in a cylindrical shape with both ends open. This case 40 has a base member 42 and an outer shell cover 44. The base member (base plate) 42 is formed in a plate shape from resin, metal, etc., and is arranged along the axial direction of the concrete pouring hose 32. The base member 42 is pressed against the outer surface of the concrete pouring hose 32 on the side with the concave portion 34. The outer shell cover 44 is attached to the surface of the base member 42 (the side opposite to the concrete pouring hose 32).

[0039] The outer shell cover 44 is formed in a plate shape from resin, metal, or the like, and is positioned along the base member 42. The cross-sectional shape of the outer shell cover 44 is an arc shape that curves convexly toward the opposite side of the base member 42. Both ends of the outer shell cover 44 in the width direction (circumferential direction) are joined to both ends of the base member 42 in the width direction by adhesive or welding. A housing chamber 46, which will be described later, is formed inside these outer shell cover 44 and base member 42.

[0040] The outer shell cover 44 and the outer circumferential surface of the tip end of the concrete pouring hose 32 are covered with a covering material 52 via a cushioning material 50. The covering material 52 is formed, for example, from heat shrink tubing. This covering material 52 restrains and integrates the tip end of the concrete pouring hose 32 with the case 40.

[0041] Note that the covering material 52 is not limited to heat shrink tubing; for example, it may be tape or the like wrapped around the outer surface of the outer shell cover 44 and the tip end of the pouring hose 32.

[0042] As shown in Figures 6 and 7, a housing chamber 46 is formed inside the case 40. An irradiation port 46A leading to the housing chamber 46 is formed at one end of the case 40. The pouring hose 32 and the case 40 are integrated with their respective end openings 32A and irradiation port 46A aligned.

[0043] As shown in Figures 7 and 8, the housing chamber 46 houses a laser rangefinder 60, a wireless transmitter 62, and a power supply 64, which can be pulled out from the irradiation port 46A. Specifically, the housing chamber 46 houses a tray 70 which can be pulled out from the irradiation port 46A. The tray 70 is formed in a plate shape from resin, metal, or the like, and is positioned along the axial direction of the pouring hose 32.

[0044] Furthermore, the tray 70 is mounted on the surface of the base member 42 so as to be slidable in the axial direction of the pouring hose 32. As a result, as shown in Figure 8, the tray 70 can be pulled out from the irradiation port 46A of the case 40.

[0045] The leading edge 70E of the tray 70 in the pull-out direction is detachably fixed to the base member 42 by screws 72. The base member 42 has screw holes 73 (see Figure 4) for the screws 72.

[0046] A laser rangefinder 60, a wireless transmitter 62, and a power supply 64 are mounted on the surface of the tray 70 (the side opposite to the base member 42). These laser rangefinder 60, wireless transmitter 62, and power supply 64 are arranged in the order of laser rangefinder 60, wireless transmitter 62, and power supply 64, starting from the front end 70E of the tray 70.

[0047] Furthermore, the surface of the tray 70 is provided with several crescent-shaped ribs 74 that support the outer shell cover 44. These ribs 74 may be provided as needed and can be omitted as appropriate.

[0048] (Laser rangefinder) As shown in Figure 2, the laser distance meter 60 is a measuring instrument used to measure the drop height H of the ready-mixed concrete 22 discharged from the tip opening 32A of the concrete pouring hose 32.

[0049] Specifically, the laser distance meter 60 measures (calculates) the distance from a predetermined measurement starting point to the object to be measured based on the laser light irradiated onto the object and the laser light reflected from the object. In this embodiment, the objects to be measured are the upper surface (bottom formwork) of the structure 28 on which a pair of formwork 27 for the RC wall 20 is erected, and the concrete pouring surface 22S of the ready-mixed concrete 22.

[0050] As shown in Figure 7, the laser distance meter 60 irradiates a laser beam onto the object to be measured from the irradiation port 46A, and also has an irradiation receiving unit 60A that receives the laser beam reflected by the object to be measured via the irradiation port 46A. In other words, the laser distance meter 60 is positioned with the irradiation receiving unit 60A facing the irradiation port 46A.

[0051] The laser rangefinder 60 is positioned with a predetermined gap G between the irradiation port 46A and the irradiation receiving unit 60A. This prevents contamination of the irradiation receiving unit 60A due to splashing of fresh concrete 22 discharged from the tip opening 32A of the concrete pouring hose 32.

[0052] The measurement starting point of the laser distance meter 60 is set, for example, to the tip opening 32A of the concrete pouring hose 32, or to the front or rear end of the laser distance meter 60. If the measurement starting point of the laser distance meter 60 is set to the front or rear end of the laser distance meter 60, the drop height H of the ready-mixed concrete 22 (see Figure 2) is measured (calculated) by considering the distance from the front or rear end of the laser distance meter 60 to the tip opening 32A of the concrete pouring hose 32.

[0053] (Wireless transmitter) A wireless transmitter 62 is electrically connected to the laser rangefinder 60. The laser rangefinder 60 outputs the measured drop height H (see Figure 2) to the wireless transmitter 62. The wireless transmitter 62 is wirelessly connected to a wireless receiver 82, which will be described later. The wireless transmitter 62 transmits the drop height H input from the laser rangefinder 60 to the wireless receiver 82.

[0054] (power supply) The power supply 64 is, for example, a rechargeable battery such as a dry cell battery or a rechargeable battery. The power supply 64 is also electrically connected to the laser rangefinder 60 and the wireless transmitter 62. Power is supplied from this power supply 64 to the laser rangefinder 60 and the wireless transmitter 62.

[0055] (Control device) As shown in Figure 1, the control device 80 includes, for example, a wireless receiver 82, a computer 84, and a wireless transmitter 86. The wireless receiver 82 is wirelessly connected to the wireless transmitter 86 of the fall height measuring device 30. The wireless receiver 82 outputs the fall height H received from the wireless transmitter 86 to the computer 84.

[0056] Computer 84 controls the overall operation of the fall height management system 10. This computer 84 is equipped with a CPU, memory, storage unit, and input / output devices, etc. The storage unit has a fall height management program pre-stored in it.

[0057] The CPU reads the drop height management program from the memory unit, loads it into memory, and sequentially executes each step of the drop height management program. The memory unit also stores a predetermined value (threshold) for the drop height H of the ready-mix concrete 22. This predetermined value is set to, for example, 1.5m. Alternatively, a value obtained by multiplying 1.5m by a predetermined safety factor (for example, 1.3m to 1.4m) may be set.

[0058] The predetermined drop height can be changed as needed. Furthermore, the functions implemented by the drop height management program can also be implemented using, for example, semiconductor integrated circuits, or more specifically, ASICs (Application Specific Integrated Circuits).

[0059] A wireless transmitter 86 is electrically connected to the computer 84. The computer 84 transmits an operation signal and a stop signal, described later, to the indicator lamp 90 via the wireless transmitter 86.

[0060] (Indicator lamp) The alarm lamp 90 is wirelessly connected to the wireless transmitter 86. The alarm lamp 90 can be attached, for example, to the worker's arm or the concrete pouring hose 32. The alarm lamp 90 lights up when it receives an activation signal from the wireless transmitter 86. Conversely, the alarm lamp 90 turns off when it receives a stop signal from the wireless transmitter 86.

[0061] Note that the notification lamp 90 is an example of a notification means (announcer).

[0062] (Construction methods for concrete members) Next, using the reinforced concrete wall 20 as an example, the concrete construction method according to this embodiment will be explained, and the operation of the fall height management system 10 according to this embodiment will be described.

[0063] Figure 2 shows the state in which the tip of a concrete pouring hose 32 is inserted into a pair of formwork 27 of an RC wall 20. A drop height measuring device 30 is attached to the tip of this concrete pouring hose 32. The laser distance meter 60 and other components of the drop height measuring device 30 are operational.

[0064] In this state, worker W measures the drop height H of the ready-mixed concrete 22 using a laser rangefinder 60, with the tip opening 32A of the pouring hose 32 and the irradiation port 46A (see Figure 7) of the drop height measuring device 30 pointed downwards.

[0065] Specifically, the laser rangefinder 60 continuously emits laser light L downwards from the irradiation receiving unit 60A through the irradiation port 46A (see Figure 7). This laser light L is reflected, for example, by the upper surface 28S of the building structure 28, or the poured surface 22S of the poured ready-mix concrete 22, and is received by the irradiation receiving unit 60A.

[0066] As a result, the laser distance meter 60 continuously measures the drop height H of the ready-mixed concrete 22 from the tip opening 32A of the pouring hose 32 to the upper surface 28S of the structure 28, or the pouring surface 22S of the already poured ready-mixed concrete 22.

[0067] Furthermore, the laser rangefinder 60 may measure the drop height H intermittently, not just continuously.

[0068] The drop height H measured by the laser rangefinder 60 is input to the computer 84 of the control device 80 via the wireless transmitter 62 and wireless receiver 82, as shown in Figure 1. When the computer 84 receives the drop height H from the wireless receiver 82, it executes the drop height management process shown in Figure 9. Note that the drop height management process is just one example of a drop height management method.

[0069] First, in step S10, the computer 84 compares the drop height H input from the wireless receiver 82 with a predetermined value. If the drop height H is less than or equal to the predetermined value (drop height H ≤ predetermined value), the computer 84 proceeds to step S20.

[0070] In step S20, the computer 84 transmits an activation signal to the notification lamp 90 via the wireless transmitter 86 to terminate the fall height management process. When the notification lamp 90 receives the activation signal, the notification lamp 90 lights up or remains lit. This notifies the worker W that the fall height H is below a predetermined value.

[0071] After confirming that the indicator lamp 90 is lit, worker W signals, for example, the operator of a concrete pump truck (not shown) to activate the pump device. As a result, ready-mix concrete 22 is discharged from the tip opening 32A of the pouring hose 32.

[0072] On the other hand, if the drop height H exceeds a predetermined value in step S10 (drop height H > predetermined value), the computer 84 proceeds to step S30.

[0073] In step S30, the computer 84 transmits a stop signal to the notification lamp 90 via the wireless transmitter 86 and terminates the fall height management process. When the notification lamp 90 receives the stop signal, the notification lamp 90 turns off or remains off. This notifies the worker W that the fall height H has exceeded a predetermined value.

[0074] Worker W adjusts the height of the concrete pouring hose 32 so that the indicator lamp 90 does not turn off. This maintains the drop height H of the ready-mixed concrete 22 below a predetermined value.

[0075] As described above, according to the concrete member construction method of this embodiment, a laser distance meter 60 attached to the tip of the pouring hose 32 measures the distance (drop height H) from the tip opening 32A of the pouring hose 32 to a predetermined position where the fresh concrete 22 falls.

[0076] This makes it easy to keep the drop height H of the ready-mixed concrete 22 below a predetermined value. As a result, material segregation of the ready-mixed concrete 22 due to dropping is suppressed, thus preventing deterioration of the concrete's quality.

[0077] (effect) Next, the effects of the fall height measuring device 30 and the fall height management system 10 according to this embodiment will be described.

[0078] As shown in Figure 2, according to the fall height measuring device 30 of this embodiment, the concrete pouring hose 32 discharges ready-mixed concrete 22 from its tip opening 32A. A laser distance meter 60 is attached to the tip of the concrete pouring hose 32.

[0079] Here, the laser distance meter 60 measures the distance (drop height H) from the tip opening 32A of the concrete pouring hose 32 to a predetermined position where the fresh concrete 22 falls. This makes it easy to keep the drop height H of the fresh concrete 22 below a predetermined value. As a result, material segregation of the fresh concrete 22 due to falling is suppressed, thus preventing deterioration of the concrete quality.

[0080] Furthermore, by attaching a laser distance meter 60 to the tip of the concrete pouring hose 32, the drop height H of the ready-mixed concrete 22 can be measured directly. Therefore, the configuration of the drop height measuring device 30 can be simplified.

[0081] Furthermore, in this embodiment, the drop height H of the ready-mixed concrete 22 can be measured on-site when the ready-mixed concrete 22 is being poured.

[0082] Furthermore, the drop height measuring device 30 includes a case 40 that is attached to the outer surface of the tip end of the concrete pouring hose 32, which has a deformed cross-section. By housing the laser distance meter 60 in this case 40, the tip end of the concrete pouring hose 32 can be made more compact compared to the case where the laser distance meter 60 is attached to the outer surface of the concrete pouring hose 32, which does not have a deformed cross-section.

[0083] Therefore, for example, the tip (case) of the pouring hose 32 can be inserted into the gaps between the vertical reinforcement bars 24, the horizontal reinforcement bars 26, and the formwork 27, thereby improving workability.

[0084] Furthermore, by housing the laser rangefinder 60 and the like in the case 40, the durability of the laser rangefinder 60 (precision instrument) and the like are enhanced, and the decrease in the measurement accuracy of the laser rangefinder 60 due to contamination and the like is suppressed.

[0085] Furthermore, by housing the laser rangefinder 60 and other components in the case 40 in a retractable manner, the maintainability of the laser rangefinder 60 and other components is improved. In addition, replacing the power supply 64 and other components becomes easier.

[0086] Furthermore, the fall height management system 10 according to this embodiment includes an alarm lamp 90 and a control device 80. The control device 80 illuminates the alarm lamp 90 based on the fall height H measured by the laser rangefinder 60. More specifically, the control device 80 illuminates the alarm lamp 90 when the fall height H measured by the laser rangefinder 60 is less than or equal to a predetermined value.

[0087] This makes it easy for the worker W to notice that the drop height H of the ready-mixed concrete 22 is within a predetermined value. Therefore, the worker W can easily manage the drop height H of the ready-mixed concrete 22.

[0088] (modified version) Next, a modified example of the above embodiment will be described.

[0089] In the above embodiment, the notification lamp 90 is illuminated when the drop height H of the ready-mixed concrete 22 is below a predetermined value. However, for example, upper and lower limits may be set for the drop height H of the ready-mixed concrete 22, and the notification lamp 90 may be illuminated only when the drop height H is below the upper limit and above the lower limit. This prevents the drop height H from falling below the lower limit, thus preventing the tip of the pouring hose 32 from being buried in the ready-mixed concrete 22.

[0090] Alternatively, contrary to the above embodiment, the notification lamp 90 may be illuminated when the drop height H of the ready-mixed concrete 22 exceeds a predetermined value. In this case, the worker W is notified that the drop height H of the ready-mixed concrete 22 has exceeded a predetermined value.

[0091] Furthermore, in the above embodiment, the notification means is an alarm lamp 90. However, the notification means is not limited to an alarm lamp 90; for example, it could be a sound generating device that emits sound (announcement sound) when an activation signal is received, or a vibration generating device that emits vibration (announcement vibration). Alternatively, the notification means could be a knocking device that knocks on the worker's helmet when an activation signal is received. In addition, the notification means could be a display that displays an announcement message on a monitor or other display unit when an activation signal is received. Note that the notification means may be provided as needed and can be omitted as appropriate.

[0092] Furthermore, in the above embodiment, the cross-section at the tip of the concrete casting hose 32 is deformed. However, the laser distance meter 60 or the like may be attached to the outer surface of the circular concrete casting hose 32 without deforming the cross-section at the tip of the concrete casting hose 32.

[0093] Alternatively, the case 40 may be housed inside the tip end of the pouring hose 32, which has a circular cross-section, without deforming the cross-section of the tip end of the pouring hose 32, leaving the tip opening 32A intact. In this case, for example, the outer surface of the case 40 may be appropriately joined to the inner surface of the tip end of the pouring hose 32 by adhesive, screws, or the like.

[0094] Furthermore, the above embodiment is applicable not only to the RC wall 20 but also to the construction of various concrete members such as columns, beams, slabs, and foundations.

[0095] Although one embodiment of the present invention has been described above, the present invention is not limited to these embodiments, and various modifications may be used in appropriate combinations with one embodiment, and of course, the invention can be implemented in various forms without departing from the spirit of the present invention. [Explanation of Symbols]

[0096] 10. Fall Height Management System 22 Ready-mixed concrete 30. Drop height measuring device 32. Hose for concrete pouring 32A tip opening 40 cases 60 Laser Rangefinder 80 Control device

Claims

1. A concrete pouring hose that discharges ready-mixed concrete from its tip opening, A laser distance meter is attached to the tip of the concrete pouring hose and measures the distance to a predetermined position where the ready-mixed concrete discharged from the tip opening falls. A case for housing the laser distance meter, which is attached to the outer surface of the tip end of the pouring hose whose cross-section has been deformed, or stored inside the tip end of the pouring hose, leaving the tip opening intact, A fall height measuring device equipped with the following features.

2. The laser rangefinder is housed in a retractable manner in the case, The drop height measuring device according to claim 1.

3. A fall height measuring device according to Claim 1 or Claim 2, The means of notification, A control device that causes the notification means to provide notification based on the distance measured by the laser rangefinder, A fall height management system equipped with a fall height management system.

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