Warning device

Abstract

To make the presence of an opening in a hole formed in the floor or ground noticeable. [Solution] This is a warning device installed inside a hole formed in the floor or ground. The warning device comprises a rod-shaped housing, a mounting part provided on the outer circumference of the housing and attachable to a mounting member provided inside the hole, a control unit housed in the housing and controlling the warning device, a light-emitting part housed in the housing and emitting light based on the control of the control unit, and a detector housed on one end of the housing in the longitudinal direction that detects the open state of the lid based on the change in distance to the lid that opens and closes the opening of the hole, and outputs the detection result to the control unit. The warning device is installed inside the hole with the mounting part attached to the mounting member so that the detector is on the upper side. When the detector detects that the lid is in an open state, the control unit makes the light-emitting part emit light.

Description

Technical Field

[0001] The present invention relates to a warning device.

Background Art

[0002] Patent Document 1 discloses covering an inspection port with a manhole cover.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the invention disclosed in Patent Document 1, when a manhole cover is opened for inspection, pedestrians may not notice that the manhole cover is open and may trip over the opening of the inspection port or fall into the inspection port.

[0005] An object of the present invention is to provide a warning device that can recognize the presence of an opening of a hole formed in a floor or ground.

Means for Solving the Problems

[0006] The present invention relates to a warning device installed inside a hole formed in the floor or ground. The warning device comprises a rod-shaped housing, a mounting portion provided on the outer circumference of the housing and attachable to a mounting member provided inside the hole, a control unit housed in the housing and controlling the warning device, a light-emitting unit housed in the housing and emitting light based on the control of the control unit, and a detector housed on one end of the housing in the longitudinal direction that detects the open state of the lid based on changes in the distance to the lid that opens and closes the opening of the hole, and outputs the detection result to the control unit. The warning device is installed inside the hole with the mounting portion attached to the mounting member so that the detector is on the upper side. When the detector detects that the lid is open, the control unit causes the light-emitting unit to emit light. [Effects of the Invention]

[0007] According to the present invention, the presence of an opening in a hole formed in the floor or ground can be recognized. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows the external appearance of a warning device according to an embodiment of the present invention, where (A) is a perspective view and (B) is a side view. [Figure 2] This is a block diagram of a warning device according to an embodiment of the present invention. [Figure 3] This diagram shows an example of an installation where a warning device is installed in a hole, where (A) is a side view and (B) is a view from above. [Figure 4] This diagram shows an example of an installation where a warning device is installed in a hole, where (A) is a side view and (B) is a view from above. [Figure 5] This diagram shows an example of an installation where a warning device is installed in a hole, where (A) is a side view and (B) is a view from above. [Figure 6] This is a perspective view showing the appearance of a warning device according to a modified embodiment of the present invention. [Figure 7] This is a perspective view showing the appearance of a warning device according to a modified embodiment of the present invention. [Figure 8]This is a perspective view showing the appearance of a warning device according to a modified embodiment of the present invention. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the attached drawings.

[0010] The warning device shown in this embodiment is applied, for example, to holes (openings) provided in floor slabs at building construction sites. Holes (openings) provided in floor slabs are used for loading and unloading materials and for workers to enter and exit. These holes (openings) are normally closed with lids to prevent workers from falling in, but the lids are opened when loading and unloading materials or when workers are entering and exiting through the holes (openings). The warning device shown in this embodiment is used to make people passing around the holes (openings) or people working around them aware that the lids are open.

[0011] [Example of warning device configuration] Figure 1 shows an example of the external configuration of the warning device 10. Figure 1(A) shows an example of the basic configuration of the warning device 10 in a perspective view, and an example of a clamp 100 that can be attached to the mounting part 30 in a side view. The mounting part 30 is also called a quick-release clamp.

[0012] Figure 2 is a block diagram showing an example of the configuration of the warning device 10. The warning device 10 comprises a detector 40, a light-emitting unit 50, a control unit 60, a switching unit 70, a battery 80, and a communication unit 90. The warning device 10 also exchanges various information with a management server 200 installed in an external management facility, etc., via the communication unit 90. The management server 200 consists of an information processing device, etc., that manages holes 2 installed in various locations.

[0013] Figure 3 is a simplified diagram showing an example of installation when a warning device 10 is installed in a hole 2 at a building construction site or the like. Figure 3(A) shows a side view when the warning device 10 is installed in the hole 2. Figure 3(B) shows the warning device 10 installed in the hole 2 as viewed from above the hole 2.

[0014] As shown in FIG. 3(A), in a floor slab (hereinafter simply referred to as "floor") 1 at a building construction site or the like, an opening 2a at the upper end side of a hole 2 formed therein is covered with a lid 3. For example, the hole 2 is formed with a circular or rectangular cross-section, and its inner surface is covered with concrete.

[0015] As shown in FIGS. 3(A) and 3(B), on the inner wall of the hole 2, a lifting strap 4 for an operator to move up and down is provided so as to extend in the vertical direction. The hole 2 is normally closed by the lid 3. When an operator needs to work inside the hole 2, the operator opens the lid 3 and enters the inside of the hole 2 using the lifting strap 4.

[0016] By the way, while an operator is working inside the hole 2 or when materials are being loaded and unloaded from the hole 2, the lid 3 remains open. At this time, for example, if an operator (person) working on the ground is working near the hole 2 without noticing that the lid 3 is open, in some cases, the operator may trip over the hole 2 or fall into the hole 2. Therefore, in the present embodiment, an example of providing a warning device 10 for making an operator working around the opening 2a of the hole 2 or an operator passing around the hole 2 recognize that the lid 3 is open will be shown. The configuration of the warning device 10 will be specifically described below.

[0017] As shown in FIG. 1, the warning device 10 includes a cylindrical housing 20 Also, each part (detector 40, light emitting part 50, control part 60, switching part July 70, battery 80, communication part 90) shown in FIG. 2 is housed in the housing 20 of the warning device 10 Specifically, the detector 40 is housed in the first housing part 40a, the light emitting part 50 is housed in the second housing part 50a, and the control part 60, the battery 80, and the communication part 9 are housed in the third housing part 60a. Further, the switching part 70 is provided on one end face 10a of the housing 20 The end face 10a is the bottom surface that becomes the bottom when the warning device 10 is installed inside the hole 2

[0018] The housing 20 can be formed using a synthetic resin such as acrylic resin, plastic, etc. For example, the housing of each storage part (the first storage part 40a, the second storage part 50a, the third storage part 60a) can be formed using a synthetic resin, and the housing 20 can be formed by connecting the housings of these storage parts in the vertical direction. Note that these are just examples, and the housing 20 may be formed in other configurations.

[0019] Here, the warning device 10 is often installed in the hole 2 provided at a construction site or the like. The environment of such a hole 2 is outdoors or semi-outdoors. Therefore, the warning device 10 will be installed outdoors or semi-outdoors. In such an environment, it is often the case that rain hits the warning device 10 or water hits the warning device 10 when rain flows into the hole 2. Therefore, it is preferable to perform waterproofing on the housing 20 to prevent water from entering the inside of the housing 20 of the warning device 10. For this waterproofing, known waterproof technologies can be adopted.

[0020] Further, the warning device 10 is provided on the outer peripheral surface of the housing 20, and includes an attachment part 30 that can be attached to a strap 4 (see FIGS. 3(A) and 3(B)) provided inside the hole 2 where the warning device 10 is installed, using a clamp 100.

[0021] The clamp 100 shown in FIG. 1(A) is a mounting jig that is detachably attached to a lifting strap 4 attached inside the hole 2. The clamp 100 includes a clamp body (housing) 101, a fastening mechanism 102, and a quick release plate 103.

[0022] The clamp body 101 has a structure that sandwiches the step 4a of the strap 4 (see FIG. 3(B)) and is fixed to the step 4a using the fastening mechanism 102. Note that the step 4a is also referred to as a tread bar, a tread rod, or a cross member part. Also, for the method of attaching to the step 4a using the clamp body 101 and the fastening mechanism 102, known technologies can be adopted.

[0023] The quick-release plate 103 is a mechanical component that allows for quick attachment and detachment to the mounting portion 30 (quick-release clamp) of the warning device 10 with a single touch. For example, known technologies can be employed in which the plate engages with an elliptical cam projection or slot, enabling one-touch attachment and detachment with lever operation.

[0024] Figure 1 shows an example where the mounting portion 30 is a mounting attachment portion to which a clamp 100 (mounting jig) can be attached, but it is not limited to this. For example, the mounting portion 30 itself may be used as a mounting jig for attaching the warning device 10 to the ladder 4. In this case, it is possible to fix a mounting jig equivalent to the clamp 100 to the mounting portion 30 and use it.

[0025] Figure 1(B) is a side view of the warning device 10 when the clamp 100 is attached to the mounting portion 30. In this way, by attaching the quick-release plate 103 to the mounting portion 30 of the warning device 10, it is possible to attach the clamp 100 to the mounting portion 30 of the warning device 10.

[0026] The detector 40 is housed on one end face 10b in the longitudinal direction of the housing 20 and detects the open state of the lid 3 (see Figure 3(A)) based on the change in distance to the lid 3 (see Figure 3(A)) that opens and closes the opening 2a (see Figure 3(A) and (B)) of the hole 2 in which the warning device 10 is installed, and outputs the detection result to the control unit 60.

[0027] As the detector 40, for example, a distance sensor such as an ultrasonic sensor or a photoelectric sensor can be used. An ultrasonic sensor is a sensor that detects distance by emitting ultrasonic waves from a sensor head and receiving ultrasonic waves reflected from an object (for example, the lid 3). Based on this detected distance, it is possible to detect changes in the open / closed position of the lid 3.

[0028] Furthermore, diffuse reflection type or narrow-field reflection type photoelectric sensors can be used as photoelectric sensors. A diffuse reflection type photoelectric sensor is a sensor that can detect changes in an object (for example, lid 3) by irradiating it with light and receiving the reflected light from that object. A narrow-field reflection type photoelectric sensor is a sensor that can detect changes in a detected object by irradiating it with spot light and receiving only the reflected light from a narrow range. For example, light is irradiated in the direction of arrow AW1 (see Figure 3(A)).

[0029] Thus, it is possible to use a distance sensor as the detector 40 that can detect the presence or absence (opening or closing) of the lid 3 without requiring contact with the sensor itself.

[0030] For example, when the lid 3 of hole 2 changes from a closed state to an open state, the reflected light from the internal walls and bottom surface changes. Therefore, the detector 40 detects the open state of the lid 3 based on the change in reflected light when the lid 3 of hole 2 changes from a closed state to an open state. In other words, the detector 40 detects the opening and closing information of the lid 3 based on the change in light intensity. Thus, a known photoelectric sensor can be used as the detector 40. Note that other sensors capable of detecting the open state of the lid 3 may also be used.

[0031] Here, it is conceivable that for some reason at least a portion of the lid 3 (a portion of the opening 2a) may be open. Even in such cases, the detector 40 can detect the open state of the lid 3 based on the change in light intensity caused by the open state of at least a portion of the lid 3 (a portion of the opening 2a). However, it is also conceivable that the lid 3 may be open to the extent that a worker does not trip over it or fall in. In such cases, it is possible to adjust the detection accuracy of the detector 40 to the extent that it does not adversely affect safety, so as not to detect the open state of the lid 3. The detection accuracy of the detector 40 can be appropriately adjusted based on data obtained from experiments, simulations, etc.

[0032] The light-emitting unit 50 is housed in a second housing section 50a, which is made of a transparent or translucent material, and is a light-emitting device that emits light based on the control of the control unit 60. For example, synthetic resins such as acrylic resin and plastic can be used as the transparent or translucent material forming the second housing section 50a. Furthermore, various light-emitting elements such as LEDs (Light Emitting Diodes) can be used as the light-emitting unit 50. Since the second housing section 50a is made of a transparent or translucent material, the light from the light source of the light-emitting unit 50 is emitted so as to spread around the housing 20. For example, a worker located outside the hole 2 can easily perceive the presence of the hole 2 by the light emanating from inside the hole 2. In this way, it is possible to make it easier for workers around the hole 2 to perceive its presence. The light-emitting unit 50 is an example of a warning light.

[0033] Furthermore, the light-emitting unit 50 may be illuminated continuously or illuminated (flashed) at predetermined intervals. For example, it may be illuminated at predetermined intervals to draw the attention of workers around the hole 2. Also, for example, it may be possible to switch between a continuous illumination mode and a flashing illumination mode that illuminates at predetermined intervals. Furthermore, when flashing illumination is used, the illumination interval can be adjusted by operating the switching unit 70, as will be described later.

[0034] The control unit 60 is housed in the third housing unit 60a and is a circuit for controlling each part of the warning device 10 based on various programs stored in the memory unit (not shown). The control unit 60 is implemented by a microcomputer equipped with circuits such as a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit).

[0035] For example, when the detector 40 detects that the lid 3 is open, the control unit 60 activates the light-emitting unit 50 and the communication unit 90. After activation, the control unit 60 causes the light-emitting unit 50 to emit a predetermined amount of light and starts transmitting data to the communication unit 90. In addition, when the switching unit 70 is pressed, the control unit 60 changes the light-emitting interval of the light-emitting unit 50 according to the number of times it is pressed.

[0036] The battery 80 is a power source that supplies power to each part of the warning device 10. Long-life batteries such as lithium primary batteries and alkaline primary batteries can be used as the battery 80. Furthermore, the power consumption of the battery 80 can be further reduced by omitting various display units in the warning device 10 (for example, the battery level indicator). In addition, as will be described later, the power consumption of the battery 80 can be further reduced by stopping the operation of each part (for example, the light-emitting unit 50 and the communication unit 90) until the open state of the lid 3 is detected.

[0037] The communication unit 90 is a communication device that performs various types of information exchange and communication with external devices. For example, each type of communication is performed using wired communication or wireless communication.

[0038] The switching unit 70 is an operating member for setting the illumination state of the light-emitting unit 50. For example, the switching unit 70 can be a light-emitting speed adjustment button that adjusts the illumination interval of the light-emitting unit 50. For example, the illumination interval can be adjusted at predetermined intervals (for example, 0.5-second intervals by default) depending on the number of times the switching unit 70 is pressed. For example, let's assume that the initial illumination interval is 1 second. In this case, if the switching unit 70 is pressed only once, the control unit 60 changes the illumination interval of the light-emitting unit 50 to 1.5 seconds. If the switching unit 70 is pressed twice in a row, the control unit 60 changes the illumination interval of the light-emitting unit 50 to 2.0 seconds. If the switching unit 70 is pressed three times in a row, the control unit 60 changes the illumination interval of the light-emitting unit 50 to 2.5 seconds. Thereafter, the illumination interval of the light-emitting unit 50 is changed to lengthen until it reaches the maximum illumination interval (for example, 5.0 seconds).

[0039] For example, it is conceivable that workers may experience stress if they are exposed to light with short flashing intervals for an extended period. Therefore, after a worker enters hole 2, the flashing interval of the light-emitting unit 50 can be lengthened to reduce the worker's stress.

[0040] As described above, in the environment in which the warning device 10 is installed, rainwater often hits the warning device 10 or rainwater flows into the hole 2, causing water to hit the warning device 10. Therefore, when the warning device 10 is installed in such an environment, it is important to prevent water from entering the internal components of the warning device 10, such as the switching section 70, even when water hits the warning device 10. For example, if there is even a slight protrusion on the top or side of the warning device 10, it may create a path for water such as condensation or rainwater to enter. Therefore, to prevent water such as condensation or rainwater from entering, a switching section 70 is provided on the lower end face 10a of the housing 20. This makes it possible to prevent water from entering the switching section 70, even if water runs along the side of the housing 20 of the warning device 10, as the water will fall from the side of the housing 20 to the bottom of the warning device 10. This makes it possible to increase the durability of the warning device 10.

[0041] Note that Figure 1 shows an example in which the warning device 10 is equipped with a switching unit 70, but it is not limited to this. For example, if the light emission interval of the light-emitting unit 50 is kept constant, the switching unit 70 may be omitted.

[0042] Furthermore, the warning device 10 is mounted on step 4a of the ladder 4 (see Figure 3(B)) with the mounting portion 30 so that the detector 40 is facing upwards inside the hole 2 (see Figure 3(A) and (B)) in which the warning device 10 is installed. Also, when the warning device 10 is installed inside the hole 2, the detector 40, light-emitting portion 50, and control unit 60 are housed inside the housing 20 in the order of the detector 40, light-emitting portion 50, and control unit 60, from top to bottom in the longitudinal direction of the housing 20.

[0043] Furthermore, the housing 20 is cylindrical, and the second housing section 50a housing the light-emitting unit 50 may be transparent or semi-transparent, while the outer surfaces of the first housing section 40a housing the detector 40 and the third housing section 60a housing the control unit 60 may be painted in a warning color. For example, the outer surface of the first housing section 40a can be painted with a red fluorescent paint (or phosphorescent paint) to serve as a warning color, and the outer surface of the third housing section 60a can be painted with a yellow fluorescent paint (or phosphorescent paint) to serve as a safety color. In this way, by painting the outer surfaces of the first housing section 40a and the third housing section 60a, which are located above and below the light-emitting unit 50, with fluorescent paint (or phosphorescent paint), it is possible to make the outer surfaces of the first housing section 40a and the third housing section 60a slightly luminous so that they are visible to workers due to the light from the light-emitting unit 50. Furthermore, by assigning different colors to each of the housing sections (first housing section 40a, second housing section 50a, third housing section 60a) that make up the housing 20, the operator handling the warning device 10 can easily identify each section.

[0044] [Example of warning device installation] Next, we will explain how to install the warning device 10.

[0045] First, the installer of the warning device 10 fixes and attaches the clamp 100 to the step 4a of the ladder 4 inside the hole 2. Next, the installer attaches the mounting part 30 of the warning device 10 to the clamp 100 fixed to the step 4a of the ladder 4. This makes it possible to attach the warning device 10 to the ladder 4 inside the hole 2, as shown in Figures 3(A) and 3(B). It is preferable to attach the warning device 10 to a position on the step 4a of the ladder 4 that avoids the part where each worker goes up and down. Therefore, as shown in Figure 3(B), it is preferable to attach the warning device 10 to one end of the step 4a of the ladder 4. As will be described later, the warning device 10 may also be attached to the outside of the support column 4b of the ladder 4 (see Figure 4(B)), or to the metal fitting 7 (see Figure 5(B)).

[0046] In this way, by separating the clamp 100 of the warning device 10 and the mounting part 30 of the warning device 10 and performing the installation work on each separately, the installation worker can perform the work more easily. For example, since only the clamp 100 is used initially as the mounting member to step 4a of the ladder 4, it is possible to reduce the possibility of dropping the warning device 10 during the installation work of step 4a of the ladder 4.

[0047] For example, if the clamp 100 is integrated with the warning device 10, when installing the ladder 4 onto step 4a, the main body of the warning device 10 will get in the way, making it highly likely that the installer will have difficulty tightening the clamp 100. It is also conceivable that the installer will be unable to secure the clamp 100 and will have to assume an unstable working posture. In such a case, there is a possibility that the warning device 10 may fall during the installation of the ladder 4 onto step 4a. Furthermore, in such a case, it is important to prevent the installer from losing their balance and becoming endangered. Therefore, by separating the clamp 100 of the warning device 10 and the mounting part 30 of the warning device 10 and performing the installation work for each separately, it is possible to avoid such dangerous situations.

[0048] Note that Figure 3(B) shows an example of attaching the clamp 100 to a horizontally extending step 4a, but it is not limited to this. As mentioned above, the clamp 100 may also be attached to a vertically extending support column 4b of the ladder 4. In this case, the shape of the clamp 100 should be such that it can be attached to the support column 4b. An example of this is shown in Figure 4.

[0049] During construction, temporary openings may be created. These temporary openings may not have ladders installed. In cases where ladders are not installed, it is possible to attach clamp 100 using some kind of iron material (a member with a certain degree of strength) provided in the opening. This iron material may be, for example, an internal steel member such as an anchor, reinforcing bar, joint metal, or screw metal. An example of this is shown in Figure 5.

[0050] [Example of a warning from a warning device] Next, the warning method of the warning device 10 will be described.

[0051] As shown in Figure 3(A), when the opening 2a of the hole 2 is closed by the cover 3, the detector 40 does not detect that it is open. In this state, the light-emitting unit 50 and the communication unit 90 are all in the off state.

[0052] When a worker opens the lid 3, the detector 40 detects the change in the lid 3, and detection information indicating the open state of the lid 3 is transmitted from the detector 40 to the control unit 60. The detector 40 continuously performs detection processing after detecting the open state of the lid 3. When the control unit 60 receives detection information indicating the open state of the lid 3, it activates the light-emitting unit 50 and the communication unit 90. Specifically, the control unit 60 makes the light-emitting unit 50 illuminate. For example, while the open state of the lid 3 is detected, the control unit 60 either keeps the light-emitting unit 50 constantly illuminated or makes it blink in a predetermined pattern.

[0053] Furthermore, the control unit 60 transmits open information to the management server 200 via the communication unit 90, indicating that the lid 3 is in an open state. For example, while the lid 3 is detected to be in an open state, the control unit 60 periodically or irregularly transmits open information to the management server 200 to indicate this fact.

[0054] As described above, in this embodiment, when a worker opens the lid 3, the light-emitting unit 50 and the communication unit 90 are activated and perform predetermined operations. This allows workers passing around the hole 2 or working around the hole 2 to recognize that the lid 3 covering the hole 2 is open and to be aware of the existence (location) of the opening 2a of the hole 2. This prevents workers from tripping over the hole 2 or falling into the hole 2. Furthermore, since the warning device 10 is made up of a rod-shaped housing 20, the warning device 10 can be installed so as not to obstruct the movement of workers when they enter or exit through the opening 2a of the hole 2. For example, it is possible to prevent workers from accidentally hitting the warning device 10 with their tool belts or safety belts.

[0055] On the other hand, when a worker closes the lid 3, the detector 40 detects the change in the lid 3, and detection information indicating the closed state of the lid 3 is transmitted from the detector 40 to the control unit 60. When the control unit 60 receives the detection information indicating the closed state of the lid 3, it stops the operation of the light-emitting unit 50 and the communication unit 90. Specifically, the control unit 60 stops the light emission of the light-emitting unit 50. The control unit 60 also transmits closed information indicating that the closed state of the lid 3 has been detected to the management server 200 via the communication unit 90. In this case, the control unit 60 transmits closed information to the management server 200 at the timing when the closed state of the lid 3 is detected. Furthermore, after detecting the closed state of the lid 3, the detector 40 periodically performs detection processing.

[0056] Here, if the hole 2 is a space surrounded by concrete, and there is an iron cover 3 over the opening 2a of the hole 2, there is a high possibility that communication between the warning device 10 installed inside the hole 2 and the communication equipment installed outside the hole 2 will be hindered. In other words, the area where the warning device 10 is installed is likely to be an area with poor radio wave conditions. Therefore, the warning device 10 will not perform data communication until the detector 40 detects that the cover 3 is open. Furthermore, it is preferable to adopt a wireless method for the communication method of the warning device 10 that can ensure stable communication in areas with poor radio wave conditions and can transmit over long distances with low power. For example, the LoRa® communication system can be adopted as this wireless method. Thus, in environments where there is an iron cover 3 over the opening 2a of the hole 2 and there is a high possibility that communication between the warning device 10 and external communication equipment will be hindered, communication will not be performed. This makes it possible to reduce the power consumption of the battery 80.

[0057] For example, based on open or closed information transmitted from the warning device 10, the management server 200 can notify the administrator of the existence of holes 2 with open covers 3 among the multiple holes 2 installed in various locations. For example, the management server 200 can display hole markers (icons) indicating the location of each hole 2 on a map. In this case, the management server 200 can visually notify the administrator of the management server 200 of the location of the hole 2 with an open cover 3 by using a different display method for the hole marker corresponding to the hole 2 with an open cover 3 from other hole markers (for example, by using a specific color or flashing).

[0058] Furthermore, for example, the management server 200 can transmit information about multiple holes 2 installed in various locations and the holes 2 with open covers 3 to a portable device (e.g., a smartphone) held by the administrator of the management server 200, and use that portable device to notify the administrator of the open / closed status of the holes. For example, similar to the notification example by the management server 200 described above, the management server 200 can display map information on the display of the portable terminal to visually notify each worker of the location of the holes 2 with open covers 3.

[0059] [Example of installing an oxygen concentration meter and camera] For example, it is possible to install at least one of an oxygen concentration meter and a camera inside hole 2. For example, it is possible to install a camera at a position opposite the ladder 4 inside hole 2 and install an oxygen concentration meter at the bottom of hole 2. In this case, the control unit 60 can exchange various information with the oxygen concentration meter and camera via the communication unit 90. A hydrogen sulfide concentration meter may be installed instead of an oxygen concentration meter, or both an oxygen concentration meter and a hydrogen sulfide concentration meter may be installed. Other measuring instruments may also be installed.

[0060] For example, when the control unit 60 acquires detection information indicating that the lid 3 is open, it activates the oxygen concentration meter and acquires the measurement result (oxygen concentration) from the oxygen concentration meter. The control unit 60 then transmits the measurement result (oxygen concentration) from the oxygen concentration meter to the management server 200 via the communication unit 90. The control unit 60 may also change the light emission pattern, color pattern, etc., of the light emission unit 50 according to the measurement result (oxygen concentration) from the oxygen concentration meter. This makes it possible to recognize the oxygen concentration inside the hole 2 from outside the hole 2, so that the safety inside the hole 2 can be confirmed before working inside the hole 2.

[0061] Furthermore, for example, when the control unit 60 acquires detection information indicating that the lid 3 is open, it activates the camera and starts imaging the inside of the hole 2. This imaging operation makes it possible to generate images of, for example, workers entering and exiting the hole 2. The control unit 60 also acquires the data of the images generated by the camera. Then, the control unit 60 transmits the image data to the management server 200 via the communication unit 90.

[0062] [Example of installing display devices, rotating lights, and speakers] For example, it is possible to install at least one of a display device, a rotating light, and a speaker inside or outside the hole 2. For example, it is possible to install a display device, a rotating light, and a speaker outside the opening 2a of the hole 2. In this case, the control unit 60 can exchange various types of information with the display device, rotating light, and speaker via the communication unit 90.

[0063] For example, when the control unit 60 acquires detection information indicating that the lid 3 is open, it can activate a display device and display a predetermined message on the display device (e.g., an electronic display board). Also, when the control unit 60 acquires detection information indicating that the lid 3 is open, it can activate a rotating light that turns on a light source and rotates a reflector. Furthermore, when the control unit 60 acquires detection information indicating that the lid 3 is open, it can output a predetermined message or warning sound from a speaker.

[0064] [Other installation examples of warning devices] Figure 4 is a simplified diagram showing an example of installation when a warning device 10 is installed in a hole 2 at a building construction site. Figure 4(A) shows a side view when the warning device 10 is installed in the hole 2. Figure 4(B) shows the warning device 10 installed in the hole 2 as viewed from above the hole 2. Note that the example shown in Figure 4 is a modified version of Figure 3, differing in that instead of attaching the clamp 100 to the step 4a of the ladder 4, the clamp 100a is attached to the support column 4b of the ladder 4. For this reason, the following explanation will focus on the differences from Figure 3, and the explanation of parts common to Figure 3 will be omitted.

[0065] The clamp 100a, which is attached to the support column 4b of the ladder 4 (see Figure 4(B)), is a modified version of the clamp 100 (see Figure 1), has a structure that clamps onto the support column 4b, and includes a clamp body 101 that is fixed to the support column 4b using a fastening mechanism 102.

[0066] Step 4a is the part where workers place their hands and feet when ascending or descending the ladder 4. Therefore, if the warning device 10 is attached to step 4a, the warning device 10 may get in the way of workers ascending or descending the ladder 4. In addition, if a worker accidentally touches the warning device 10 with their hands or feet while ascending or descending the ladder 4, the warning device 10 may fall off.

[0067] Therefore, as shown in Figure 4(B), by attaching the warning device 10 to the outside of the support column 4b, it is possible to prevent the warning device 10 from interfering with the worker's ascent or descent of the ladder 4. Furthermore, it is possible to reduce the possibility of a worker accidentally touching the warning device 10 with their hands or feet when ascending or descending the ladder 4, and to prevent the warning device 10 from falling off. Although the device is not shown in the illustration, the warning device 10 may also be attached to the bracket portion 4c that supports the support column 4b of the ladder 4 from the inner wall of the hole 2. In this case as well, it is possible to reduce the possibility of a worker accidentally touching the warning device 10 with their hands or feet when ascending or descending the ladder 4, and to prevent the warning device 10 from falling off.

[0068] Figure 5 is a simplified diagram showing an example of the installation of a warning device 10 in a hole 5 at a building construction site. The hole 5 is a temporary opening formed in the floor 1 at a building construction site, and the upper opening 5a is covered by a lid 6. As mentioned above, a ladder may not be installed in the temporary opening. In Figure 5, a ladder is not installed in the hole 5, but an example is shown in which a metal fitting 7 protrudes from the inner wall of the hole 5. The metal fitting 7 is a metal fitting that protrudes approximately horizontally from the hole 5. In Figure 5, an example is shown in which deformed reinforcing bars that were pre-installed during concrete pouring are used as the metal fitting 7, but the metal fitting 7 may also be provided using post-installed anchors or the like.

[0069] Figure 5(A) shows a side view of the warning device 10 installed in the hole 5. Figure 5(B) shows the warning device 10 installed in the hole 5 as viewed from above the hole 5. Note that the example shown in Figure 5 is a modified version of Figure 3, differing in that the clamp 100b is attached to the metal fitting 7 instead of the clamp 100 being attached to the step 4a of the ladder 4. Therefore, the following explanation will focus on the differences from Figure 3, and the explanation of the parts common to Figure 3 will be omitted.

[0070] The clamp 100b, which is attached to the metal fitting 7 (see Figure 5(B)), is a modified version of the clamp 100 (see Figure 1), and has a structure that clamps onto the metal fitting 7. It comprises a clamp body 101 that is fixed to the metal fitting 7 using a fastening mechanism 102.

[0071] Thus, even in holes 5 where a ladder is not installed, the warning device 10 can be attached to the metal fittings 7 protruding from the inner wall of hole 5.

[0072] Note that the mounting method of the warning device 10 shown in Figures 3 to 5 is just one example, and it can be mounted in other locations. For example, the warning device 10 may be mounted in other parts of the inner walls of holes 2 and 5.

[0073] [Example of creating a step on the outer surface of the enclosure] Figures 6 and 7 are perspective views showing modified versions of the warning device. Figure 6 is a perspective view showing a warning device 300 with a step 313 on the outer surface of the housing 310. Figure 7 is a perspective view showing a warning device 400 with a step 413 on the outer surface of the housing 410. In Figures 6 and 7, parts common to the configuration shown in Figure 1 are denoted by the same reference numerals and described accordingly. Furthermore, some explanations of parts common to and corresponding to the configuration shown in Figure 1 are omitted.

[0074] Figure 6 shows an example in which the outer diameters of the first housing section 320 and the second housing section 330 are larger than the outer diameter of the third housing section 340, and a step 313 is provided at the boundary between the outer surface 311 of the second housing section 330 and the outer surface 312 of the third housing section 340. The step 313 is also called a setback or gap.

[0075] Figure 7 shows an example in which the outer diameter of the first housing section 420 is larger than the outer diameters of the second housing section 430 and the third housing section 440, and a step 413 is provided at the boundary between the outer surface 411 of the first housing section 420 and the outer surface 412 of the second housing section 430. The step 413 is also called a setback or gap.

[0076] As mentioned above, the warning device 300 is often installed outdoors or semi-outdoors. In such environments, the warning device 300 is often exposed to rainwater or comes into contact with water through the holes 2. Therefore, it is important to prevent water from entering the internal components of the warning device 300 (especially the control equipment) even when water is splashed on the warning device 300. The same applies to the warning device 400.

[0077] Therefore, in the example shown in Figure 6, in order to prevent water such as condensation or rainwater from entering the third housing 340 which houses the control unit 60, battery 80, and communication unit 90, a step 313 is provided at the boundary between the outer surface 311 of the second housing 330 and the outer surface 312 of the third housing 340, and the housing 310 is constructed by screwing together, for example, threaded portions provided on both. As a result, even if water runs along the side of the housing 310 of the warning device 300, the water will fall from the outer surface 311 of the second housing 330 to the bottom of the warning device 300, thus preventing water from entering the third housing 340. In other words, it is possible to prevent water from entering from the joint between the second housing 330 and the third housing 340. This makes it possible to increase the durability of the warning device 300.

[0078] Furthermore, in the example shown in Figure 7, in order to prevent water such as condensation or rainwater from entering the second housing 430 that houses the light-emitting part 50, a step 413 is provided at the boundary between the outer surface 411 of the first housing 420 and the outer surface 412 of the second housing 430, and the housing 410 is completed by screwing together, for example, threaded portions provided on both.

[0079] Here, it is assumed that the detector 40 (for example, a distance sensor) stored in the first housing 420 will be replaced relatively often. For this reason, it is also assumed that the first housing 420 will be removed from the second housing 430 frequently. Even in such cases, as shown in the example in Figure 7, it is possible to prevent water from entering the second housing 430 and to prevent water from entering through the joint between the first housing 420 and the second housing 430. This makes it possible to increase the durability of the warning device 400.

[0080] Furthermore, by making the outer diameters of the second housing section 430 and the third housing section 440 smaller than the outer diameter of the first housing section 420, it is possible to make it easier for the installer to hold the warning device 400 when carrying it around or when installing the warning device 400. In addition, by making the first housing section 420, which corresponds to the head, a thicker part, and the second housing section 430 and the third housing section 440, which correspond to the body, finer details, it is possible to achieve a sharp, compact, and sophisticated aesthetic design.

[0081] Note that the positions of steps 313 and 413 shown in Figures 6 and 7 are just examples, and steps may be provided in other parts. For example, the positions of the steps can be appropriately selected considering the ease of replacing various parts such as sensors and batteries housed inside the housing.

[0082] [Variations of warning devices] Figure 8 is a diagram showing a modified version of the warning device, and is a perspective view showing a warning device 500 composed of a first housing 511 and a second housing 512. In Figure 8, parts common to the configuration shown in Figure 1 are denoted by the same reference numerals and described accordingly. Also, some of the descriptions of parts common to and corresponding to the configuration shown in Figure 1 are omitted. Figure 8 shows an example in which the switching unit 70 is omitted, but the switching unit 70 may be provided.

[0083] As shown in Figure 8, a cylindrical housing 510 is formed by connecting a first housing 511 and a second housing 512, which have a shape like a cylinder cut in half vertically (semi-cylindrical), and a detector 40 is provided at the top to constitute the warning device 500. The first housing 511 and the second housing 512 can be formed using synthetic resins such as acrylic resin or plastic, similar to the housing 20 (see Figure 1). Note that these are just examples, and the first housing 511 and the second housing 512 may be formed with other configurations.

[0084] Furthermore, the first housing 511 is provided with a window 513 for allowing light emitted from the light-emitting unit 50 to exit to the outside. The second housing 512 is provided with a window 514 for allowing light emitted from the light-emitting unit 50 to exit to the outside. The windows 513 and 514 are made of transparent or translucent material. For example, synthetic resins such as acrylic resin and plastic can be used as the transparent or translucent material forming the windows 513 and 514.

[0085] In this way, the warning device 500 can be configured by connecting the first housing 511 and the second housing 512, which makes the assembly of the warning device 500 easier. This makes it possible to reduce the manufacturing cost of the warning device 500.

[0086] [Example of a warning device equipped with an audio output unit] The above example illustrates how the light emitted by the light-emitting unit 50 allows workers around the hole 2 to recognize its presence (location). However, other warning methods besides visual warnings using light may be employed. For example, a sound output unit that outputs sound based on the control of the control unit 60 may be provided in the warning devices 10, 300, 400, and 500. For example, the sound output unit can be housed inside the housing 20 of the warning device 10 (for example, the third housing unit 60a). In this case, when the detector 40 detects that the lid 3 is open, the control unit 60 will output a predetermined sound (for example, an alert sound, a buzzer) from the sound output unit. A buzzer, speaker, etc., can be used as the sound output unit.

[0087] For example, at construction sites, many workers are looking at blueprints or mobile devices. Such workers may not notice the light emitted from the light-emitting unit 50. Therefore, along with the light emitted from the light-emitting unit 50, a predetermined sound is emitted from the sound output unit. The sound output from the sound output unit may be switched on and off by operating an operating member. For example, an operating member for switching the sound output unit on and off can be provided on the end face 10a of the housing 20. For example, it may be provided together with the switching unit 70, or the switching unit 70 may be omitted.

[0088] [Variations of the enclosure] The above description uses warning devices 10, 300, 400, and 500 equipped with cylindrical housings 20, 310, 410, and 510 as examples, but is not limited thereto. For example, other rod-shaped housings that are long in the vertical direction may be used when installing holes 2 and 5. For example, a rectangular parallelepiped housing or a thick plate-shaped housing (for example, a caramel box-like shape) may be used.

[0089] [Variations in the arrangement of each part] The above describes an example in which the warning devices 10, 300, 400, and 500 are installed inside holes 2 and 5, with the detector 40, light-emitting unit 50, and control unit 60 arranged in that order from top to bottom along the longitudinal direction of the housings 20, 310, 410, and 510, but is not limited to this. For example, it is conceivable that a worker performing a task while the light-emitting unit 50 is emitting light may feel stressed by the light. Therefore, for example, the light-emitting unit 50 may be provided on the lower side (end face 10a side) of the warning devices 10, 300, 400, and 500.

[0090] [Example of warning device installation] In the above explanation, the holes 2 and 5 to which the warning devices 10, 300, 400, and 500 are applied were described using the example of hole 2 formed in the floor slab of a building construction site, etc. However, the holes to which the warning devices 10, 300, 400, and 500 are applied are not limited to this. The warning devices 10, 300, 400, and 500 can also be applied to holes provided outdoors or in the floor of buildings, etc. Specifically, the warning devices 10, 300, 400, and 500 may be applied to holes such as inspection hatches formed in the floor of buildings, etc., or manholes formed in the ground, etc. Furthermore, the size of the hole does not necessarily have to be large enough for a person to enter; it is sufficient if the hole is large enough that a person may trip over it if the lid is open.

[0091] According to the above embodiments, the following effects and advantages are achieved.

[0092] Warning devices 10, 300, 400, and 500 are warning devices installed inside holes 2 and 5 formed in the floor or ground. The warning devices 10, 300, 400, and 500 each comprise a rod-shaped housing 20, 310, 410, and 510, a mounting portion 30 provided on the outer circumference of the housings 20, 310, 410, and 510 that can be attached to a ladder 4 and a metal fitting 7 (an example of a mounting member) provided inside the holes 2 and 5, a control unit 60 housed in the housings 20, 310, 410, and 510 that controls each part of the warning devices 10, 300, 400, and 500, a light-emitting portion 50 housed in the housings 20, 310, 410, and 510 that emits light based on the control of the control unit 60, and a detector 40 housed on one end face 10b in the longitudinal direction of the housings 20, 310, 410, and 510 that detects the open state of the lid 3 based on the change in distance to the lid 3 that opens and closes the opening 2a of the hole 2, and outputs the detection result to the control unit 60. The warning devices 10, 300, 400, and 500 are mounted on the ladder 4 and metal fittings 7 with the mounting portion 30 inside the holes 2 and 5 such that the detector 40 is on the upper side. The control unit 60 illuminates the light-emitting portion 50 when the detector 40 detects that the lid 3 is open.

[0093] With this configuration, for example, when the lid 3 is opened, the light-emitting part 50 is illuminated, allowing workers passing around the hole 2 or working around the hole 2 to recognize that the lid 3 covering the hole 2 is open and to be aware of the existence (location) of the opening 2a of the hole 2. This prevents workers from tripping over the hole 2 or falling into the hole 2. Furthermore, since the warning devices 10, 300, 400, and 500 are composed of rod-shaped housings 20, 310, 410, and 510, the warning devices 10, 300, 400, and 500 can be installed so as not to obstruct the movement of workers when they enter or exit the opening 2a of the hole 2. In addition, each part can be integrated to create a single device that illuminates the opening 2a of the hole 2. This makes it possible to create warning devices 10, 300, 400, and 500 that are easy to carry, install, and maintain.

[0094] When the detector 40, light-emitting unit 50, and control unit 60 are installed inside the holes 2 and 5, they are housed in the housings 20, 310, 410, and 510 in this order, from top to bottom along the longitudinal direction of the housings 20, 310, 410, and 510.

[0095] With this configuration, for example, a detector 40 for detecting the opening and closing of the lid 3 can be placed at the top, a light-emitting unit 50 for warning the surroundings that the lid 3 is open can be placed below the detector 40, and a control unit 60 can be placed at the bottom to form cylindrical warning devices 10, 300, 400, and 500. This makes it possible to realize a functional arrangement.

[0096] The ladder 4 (an example of a mounting member) is a ladder for ascending and descending that is installed inside the hole 2. The mounting part 30 is detachably attached to the ladder 4.

[0097] With this configuration, warning devices 10, 300, 400, and 500 can be attached to or removed from the ladder 4 for lifting and lowering located inside the hole 2.

[0098] The mounting section 30 is a mounting attachment section to which a mounting jig (corresponding to clamps 100 and 100a) for attaching the warning devices 10, 300, 400, and 500 to the ladder 4 can be attached, or to which clamps 100 and 100a (an example of a mounting jig) can be attached.

[0099] With this configuration, warning devices 10, 300, 400, and 500 can be easily attached to the ladder 4 using mounting fixtures such as clamps 100.

[0100] The housings 310 and 410 are cylindrical and have a first housing section located above the housing in the longitudinal direction of the housings 310 and 410, and a second housing section located below it. For example, in the case of housing 310, the second housing section 330 housing the light-emitting unit 50 can be an example of the first housing section, and the third housing section 340 housing the control unit 60 can be an example of the second housing section. In this case, the outer diameter of the second housing section 330 is larger than the outer diameter of the third housing section 340, and a step 313 is provided at the boundary between the outer surface 311 of the second housing section 330 and the outer surface 312 of the third housing section 340. Also, for example, in the case of housing 410, the first housing section 420 housing the detector 40 can be an example of the first housing section, and the second housing section 430 housing the light-emitting unit 50 can be an example of the second housing section. In this case, the outer diameter of the first housing section 420 is larger than the outer diameter of the second housing section 430, and a step 413 is provided at the boundary between the outer surface 411 of the first housing section 420 and the outer surface 412 of the second housing section 430.

[0101] With this configuration, even if water runs along the side of the housing 310 of the warning device 300, the water will fall from the outer surface 311 of the second housing 330 to the bottom of the warning device 300, thus preventing water from entering the third housing 340. In other words, it is possible to prevent water from entering through the joint between the second housing 330 and the third housing 340. This makes it possible to increase the durability of the warning device 300. Similarly, with respect to the warning device 400, it is possible to prevent water from entering through the joint between the first housing 420 and the second housing 430, thereby increasing the durability of the warning device 400.

[0102] The warning devices 10, 300, and 400 may further include a switching unit 70 (an example of an operating member) for setting the illumination state of the light-emitting unit 50. The switching unit 70 is provided on one end face 10a of the housing 20, 310, and 410 (the bottom surface which becomes the bottom when installed inside the hole 2).

[0103] With this configuration, even if water runs along the sides of the housings 20, 310, and 410 of the warning devices 10, 300, and 400, the water will fall from the sides of the housings 20, 310, and 410 down to the warning devices 10, 300, and 400, thus preventing water from entering the switching section 70. This makes it possible to increase the durability of the warning devices 10, 300, and 400.

[0104] The warning devices 10, 300, 400, and 500 are housed in the enclosures 20, 310, 410, and 510, and may further include a sound output unit that outputs sound based on the control of the control unit 60. For example, when the detector 40 detects that the lid 3 is open, the control unit 60 causes the sound output unit to output a predetermined sound.

[0105] With this configuration, for example, when the lid 3 is opened, a predetermined sound is output from the sound output unit, so that workers passing around the hole 2 or working around the hole 2 can recognize that the lid 3 covering the hole 2 is open and that there is an opening 2a of the hole 2. This prevents workers from tripping over the hole 2 or falling into the hole 2.

[0106] Although embodiments of the present invention have been described above, these embodiments only represent a part of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments. [Explanation of symbols]

[0107] 1. Floor 2, 5... holes (vertical shafts) 2a, 5a...opening 3...lid 4... boarding stairs 7. Hardware 10, 300, 400, 500...warning device 20... cabinet 30...Mounting part 40... Detector 50...Light-emitting part 60... Control Unit 70... Switching section 80... Battery 90... Communications Department 100, 100a, 100b... Clamps 101... Clamp body (housing) 102...Fascinating mechanism 103...Quick-release plate 200... Management Server

Claims

1. A warning device installed inside a hole formed in the floor or ground, A rod-shaped casing, A mounting portion is provided on the outer circumference of the housing and is attachable to a mounting member provided inside the hole, The enclosure houses a control unit that controls the warning device, A light-emitting unit housed in the aforementioned housing and which emits light based on the control of the control unit, The housing comprises a detector housed at one end in the longitudinal direction, which detects the open state of the lid based on a change in the distance to the lid that opens and closes the opening of the hole, and outputs the detection result to the control unit, The warning device is mounted such that the mounting portion is attached to the mounting member so that the detector is on the upper side inside the hole. The control unit will emit light from the light-emitting unit when the detector detects that the lid is open. Warning device.

2. A warning device according to claim 1, When the detector, the light-emitting unit, and the control unit are installed inside the hole, they are housed in the housing in this order, from top to bottom in the longitudinal direction of the housing. Warning device.

3. A warning device according to claim 1, The mounting member is a ladder for ascending and descending, which is installed inside the hole. The mounting portion is detachably attached to the ladder. Warning device.

4. A warning device according to claim 3, The mounting portion is a mounting jig for attaching the warning device to the ladder, or a mounting attachment portion to which the mounting jig can be attached. Warning device.

5. A warning device according to claim 2, The housing is cylindrical and has a first housing section located at the top and a second housing section located at the bottom. The outer diameter of the first housing is larger than the outer diameter of the second housing, and a step is provided at the boundary between the outer surface of the first housing and the outer surface of the second housing. Warning device.

6. A warning device according to any one of claims 1 to 5, The light-emitting unit further comprises an operating member for setting the light-emitting state, The operating member is provided on one end face of the housing, which is the bottom surface when installed inside the hole. Warning device.

7. A warning device according to any one of claims 1 to 5, The enclosure further comprises a sound output unit that is housed therein and outputs sound based on the control of the control unit, When the detector detects that the lid is open, the control unit will output a predetermined sound from the sound output unit. Warning device.

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