Safety assessment system and safety assessment program

Abstract

To provide a safety grasping system and a safety grasping program capable of grasping in real time the safety of a suspended scaffold, such as which member is in a dangerous state. [Solution] A safety assessment system for assessing the safety of suspended scaffolding that has floor materials and hanging materials and is installed under a bridge, characterized in that it comprises: a load value acquisition means that acquires a load value that indicates the magnitude of the load on the floor material; a structural information acquisition means that acquires structural information that indicates the structure of the suspended scaffolding based on the load value acquired by the load value acquisition means; an axial force value calculation means that calculates an axial force value that indicates the magnitude of the axial force acting on the hanging material based on the load value acquired by the load value acquisition means and the structural information acquired by the structural information acquisition means; and a safety assessment means that compares the axial force value with an allowable stress that indicates the upper limit of the axial force value for safe use of the hanging material.

Description

[Technical Field]

[0001] The present invention relates to a safety assessment system and a safety assessment program.

[0002] When installing suspended scaffolding beneath a bridge for repairs or construction, it is necessary to ensure safety during construction by preventing the collapse of scaffolding components and the falling of materials.

[0003] Conventionally, workers measure and verify the stress acting on the components of a suspended scaffold. This allows workers to confirm that the stress generated in the components of the suspended scaffold is below the allowable stress specified in safety standards, ensuring safety during construction. However, this conventional method has the problem that it is difficult to grasp the safety of the suspended scaffold in real time, such as which components of the suspended scaffold are in a dangerous state, in situations where the structure of the suspended scaffold and the load on the suspended scaffold components change from moment to moment during construction.

[0004] Here, for example, Patent Document 1 discloses a technology for providing a construction management device, a construction management method, and a construction management program for a building that enable management of the site conditions by reflecting the site conditions that change daily.

[0005] Specifically, Patent Document 1 discloses a technology for providing a construction management device that uses a 3D model analysis program to manage the construction of a building, and that manages the construction of a building using 3D design data for the building, process data for constructing the building, and sensing data related to the building, thereby enabling the management of on-site conditions that change daily to be reflected. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2023-151021 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the technology disclosed in Patent Document 1 is intended for construction management, not for safety assessment. Furthermore, the technology disclosed in Patent Document 1 requires the preparation of a large amount of data, such as 3D design data, process data, and sensing data. Furthermore, analysis programs that use 3D models require a long time to execute an analysis. Therefore, the technology disclosed in Patent Document 1 has a problem in that, in situations where the structure of the suspended scaffolding and the loads on the components of the suspended scaffolding change constantly during construction, it takes a long time to prepare the necessary data and execute the analysis program, making it difficult to assess the safety of the suspended scaffolding in real time.

[0008] The present invention was created in consideration of the above-mentioned problems, and its purpose is to provide a safety assessment system and safety assessment program that can assess the safety of a suspended scaffold in real time, such as which components are in a dangerous state, in situations where the structure of the suspended scaffold and the loads on the components of the suspended scaffold are constantly changing. [Means for solving the problem]

[0009] The safety assessment system according to the first aspect of the present invention has a floor material and a hanging material, and assesses the safety of a suspended scaffolding installed under a bridge. , in a situation where the load on the structure of the suspended scaffold or the components of the suspended scaffold changes from moment to moment. a load value acquisition means for acquiring a load value indicating the magnitude of the load applied to the floor material; a structural information acquisition means for acquiring structural information indicating the structure of the suspended scaffolding based on the load value acquired by the load value acquisition means; and an axial force value indicating the magnitude of the axial force acting on the suspended material based on the load value acquired by the load value acquisition means and the structural information acquired by the structural information acquisition means. , for each of the hanging members constituting the suspended scaffolding an axial force value calculation means for calculating the axial force; For each of the hanging members constituting the suspended scaffolding, The suspension member is characterized by being provided with a safety determination means for comparing the axial force value with an allowable stress indicating the upper limit of the axial force value in order to use the suspension member safely.

[0010] The safety assessment system of the second invention is characterized in that, in the first invention, the load value acquisition means acquires the load value at each of a plurality of locations within a range including the connected scaffolding to which the flooring is connected, and the structural information acquisition means determines that the flooring is not present at the location if the load value is less than a predetermined standard value, and determines that the flooring is present at the location if the load value is greater than the standard value, and acquires the structural information based on the determination.

[0011] The safety assessment system according to the third invention is the same as that of the second invention, further comprising a point cloud data acquisition means for acquiring point cloud data of an area including the connected scaffolding, and an object information acquisition means for acquiring object information that is an estimate of an object on the floor material based on the point cloud data acquired by the point cloud data acquisition means, and the load value acquisition means acquires the load value based on the object information acquired by the object information acquisition means.

[0012] A safety assessment system according to a fourth aspect of the present invention is the system of the first aspect of the present invention, further comprising an output image generating means for generating an output image representing the structural information and the axial force value.

[0013] The safety assessment system according to the fifth aspect of the present invention is characterized in that, in the fourth aspect, the output image generation means generates the output image based on a comparison between the allowable stress and the axial force value in the safety judgment means.

[0014] The safety assessment system according to a sixth aspect of the present invention is characterized in that, in the fourth aspect, it further comprises a display means for displaying the output image generated by the output image generation means on a VR device or an AR device.

[0015] A safety assessment program according to a seventh aspect of the present invention assesses the safety of a suspended scaffolding that has a floor material and a suspension material and is installed under a bridge. , in a situation where the load on the structure of the suspended scaffold or the components of the suspended scaffold changes from moment to moment.a load value acquisition step of acquiring a load value indicating the magnitude of a load applied to the floor material; a structural information acquisition step of acquiring structural information indicating a structure of the suspended scaffolding based on the load value acquired by the load value acquisition step; and an axial force value indicating the magnitude of an axial force acting on the suspended material based on the load value acquired by the load value acquisition step and the structural information acquired by the structural information acquisition step. , for each of the hanging members constituting the suspended scaffolding an axial force value calculation step; For each of the hanging members constituting the suspended scaffolding, The method is characterized in that a computer is caused to execute a safety determination step of comparing the axial force value with an allowable stress indicating the upper limit of the axial force value for safe use of the suspension material. [Effects of the Invention]

[0016] According to the first to sixth inventions, the structural information acquisition means acquires structural information indicating the structure of the suspended scaffolding based on the load value, the axial force value calculation means calculates the axial force value based on the load value and the structural information, and the safety determination means compares the allowable stress with the axial force value. As a result, the safety assessment system can quickly determine whether the suspended members of the suspended scaffolding meet safety standards without the need to use three-dimensional design data or data related to the construction process. This makes it possible for the safety assessment system to grasp the safety of the suspended scaffolding in real time, such as which members are in a dangerous state, in situations where the structure of the suspended scaffolding and the loads acting on the members of the suspended scaffolding change from moment to moment during construction.

[0017] In particular, according to the second aspect of the present invention, the load value acquisition means acquires load values ​​at each of a plurality of locations within an area including the connected scaffolding, and the structural information acquisition means determines that there is no flooring if the load value is equal to or less than a predetermined reference value, and determines that there is flooring if the load value is greater than the reference value. This allows the safety assessment system to estimate the structure of the suspended scaffolding more quickly without the need to use 3D design data or data related to the construction process. This enables the safety assessment system to assess the safety of the suspended scaffolding in more real time, even in situations where the structure of the suspended scaffolding and the loads acting on the components of the suspended scaffolding are constantly changing during construction.

[0018] In particular, according to the third aspect of the present invention, the object information acquisition means acquires object information, which is an estimate of an object on the floor material, based on the point cloud data acquired by the point cloud data acquisition means, and the load value acquisition means acquires load values ​​based on the object information. Therefore, the safety assessment system can quickly acquire load values ​​based on the measurement of the point cloud data, and quickly calculate the axial force values ​​of the hanging members based on the acquired load values. This makes it possible for the safety assessment system to assess the safety of the suspended scaffolding in real time, without the effort of preparing data related to load values, even in situations where the structure of the suspended scaffolding and the loads acting on the components of the suspended scaffolding change from moment to moment during construction.

[0019] In particular, according to the fourth aspect of the present invention, the output image generating means generates an output image that represents the structural information and the axial force value. Therefore, the safety assessment system can visualize the state of the suspended scaffolding, including the structure of the suspended scaffolding and the axial forces acting on the suspended members. This allows workers to visually confirm the safety of the suspended scaffolding in real time.

[0020] In particular, according to the fifth aspect of the present invention, the output image generating means generates an output image based on a comparison between the allowable stress and the axial force value in the safety assessment means. Therefore, the safety assessment system can reflect in the output image how much margin the axial force value has relative to the allowable stress and which hanging members are in a dangerous state. This allows workers to visually and in detail check the safety of the suspended scaffolding.

[0021] In particular, according to the sixth aspect of the present invention, the safety assessment system includes a display means for displaying an output image on a VR device or an AR device. Therefore, the safety assessment system can visualize the structure of the suspended scaffolding, the axial force acting on the suspended members, and the results of a comparison between the allowable stress and the axial force value in a format that is easy for workers to understand. This allows workers to easily confirm the safety of the suspended scaffolding, even in situations where the structure of the suspended scaffolding and the loads acting on the members of the suspended scaffolding are constantly changing during construction.

[0022] According to the seventh invention, the structural information acquisition step acquires structural information indicating the structure of the suspended scaffolding based on the load value, the axial force value calculation step calculates the axial force value based on the load value and the structural information, and the safety assessment step compares the allowable stress with the axial force value. Therefore, the safety assessment program can quickly determine whether the suspended scaffolding's hanging members meet safety standards without the need to use three-dimensional design data or data related to the construction process. This makes it possible for the safety assessment program to grasp the safety of the suspended scaffolding in real time, such as which members are in a dangerous state, in situations where the structure of the suspended scaffolding and the loads acting on the members of the suspended scaffolding change from moment to moment during construction. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a schematic diagram showing an example of the overall configuration of a safety assessment system according to the present invention. [Figure 2] FIG. 2 is a schematic diagram illustrating an example of a hardware configuration of the safety assessment device. [Figure 3]FIG. 3 is a schematic diagram showing an example of the configuration of a bridge and a suspended scaffolding. [Figure 4] FIG. 4 is a schematic diagram showing an example of a connected scaffolding when the suspended scaffolding is viewed from the bridge side. [Figure 5] FIG. 5 is a schematic diagram illustrating an example of a functional configuration of the safety assessment system. [Figure 6] FIG. 6 is a flowchart showing an example of steps of a safety assessment method in the first embodiment. [Figure 7] FIG. 7 is an example of a data table showing load values ​​in the first embodiment. [Figure 8] FIG. 8 is a flowchart showing an example of steps of a safety assessment method according to the second embodiment. [Figure 9] FIG. 9 is a diagram showing an example of an output image in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, an embodiment of a safety assessment system 100 to which the present invention is applied will be described in detail with reference to the drawings.

[0025] <Safety Assessment System 100> FIG. 1 is a schematic diagram showing an example of the overall configuration of a safety assessment system 100 according to the present invention.

[0026] The safety assessment system 100 is a system that uses a safety assessment device 1 to process information related to the safety of a suspended scaffolding 3 installed under a bridge 2, and assesses in real time the safety of the suspended scaffolding 3, such as which members are in a dangerous state. As shown in FIG. 1 , the safety assessment system 100 includes the safety assessment device 1. In the safety assessment system 100, the safety assessment device 1 may be connected to a VR device 4, an AR device 5, a server 6, and a point cloud data acquisition device 7.

[0027] Each element in FIG. 1 will be explained below.

[0028] <Safety grasping device 1> The safety assessment device 1 is a device that processes information related to the safety of the suspended scaffolding 3. The safety assessment device 1 calculates an axial force value based on the load value and structural information, and compares it with the allowable stress. Here, the load value is a value that indicates the magnitude of the load applied to the floor material 31 of the suspended scaffolding 3. Furthermore, the structural information is information that indicates the structure of the suspended scaffolding 3. Furthermore, the axial force value is a value that indicates the magnitude of the axial force acting on the suspended member 32. Furthermore, the allowable stress is a value that indicates the upper limit of the axial force value for safe use of the suspended member 32.

[0029] The safety assessment device 1 may externally acquire information relating to the suspended scaffolding 3. The safety assessment device 1 may transmit and receive various data to and from the point cloud data acquisition device .

[0030] Here, understanding the safety of the suspended scaffolding 3 means, for example, understanding which components of the suspended scaffolding 3 are in a dangerous state, understanding whether the magnitude of the axial force acting on the hanging members 32 of the suspended scaffolding 3 is within the allowable range, understanding whether the floor materials 31 of the suspended scaffolding 3 are connected in the planned configuration, and understanding whether the suspended scaffolding 3 meets safety standards.

[0031] FIG. 2 is a schematic diagram showing an example of the hardware configuration of the safety assessment device 1. As shown in FIG.

[0032] The safety assessment device 1 includes a housing 111, a CPU 101, a ROM 102, a RAM 103, a storage device 104, and I / Fs 105 to 107. The CPU 101, the ROM 102, the RAM 103, the storage device 104, and the I / Fs 105 to 107 are connected by an internal bus 110.

[0033] The CPU 101 controls the entire safety assessment device 1. The ROM 102 stores operation codes for the CPU 101. The RAM 103 is a work area used when the CPU 101 is operating.

[0034] The storage device 104 stores various data. For example, the storage device 104 may store data related to load values, structural information, and axial force values. The storage device 104 may also store hanger information including at least one of information related to the elastic modulus, cross-sectional area, and torsion coefficient of the hanger 32. The storage device 104 may also store hanger fixation information related to the fixing locations of the upper ends, the lower ends, or both of the upper and lower ends of each of the multiple hanger members 32. The storage device 104 may be, for example, a hard disk drive (HDD), a solid state drive (SSD), an SD card, a miniSD card, or other data storage device. The safety assessment device 1 may also have a graphics processing unit (GPU) (not shown). The I / F 105 is an interface for transmitting and receiving data to and from the VR device 4, the AR device 5, the server 6, the point cloud data acquisition device 7, and the like.

[0035] The I / F 106 is an interface for sending and receiving data to and from the input device 108. The safety assessment device 1 may acquire information related to the suspended scaffolding 3 from outside using the input device 108. A keyboard, for example, is used as the input device 108. A worker using the safety assessment device 1 inputs various data or control commands for the server 6, etc., via the input device 108. The worker may also input load values ​​and the like in the form of a data table to the safety assessment device 1 via the input device 108. Here, the worker is a person who performs work related to the suspended scaffolding 3, such as constructing the suspended scaffolding 3, or a person who supervises work related to the construction of the suspended scaffolding 3, etc.

[0036] The I / F 107 is an interface for transmitting and receiving various data to and from the display device 109. The display device 109 outputs various data stored in the storage device 104, the processing status of the safety assessment device 1, various information obtained in the safety assessment system 100, etc. A display is used as the display device 109, and may be, for example, a touch panel type. The display device 109 may output the output image 8 generated by the safety assessment device 1. The display device 109 may also output a load value, structural information, or an axial force value.

[0037] <Bridge 2> The bridge 2 is a bridge that is constructed in a location where there is a river, a valley, a road, or the like, and is, for example, an arch bridge or a rigid frame bridge.

[0038] <Hanging scaffolding 3> The suspended scaffolding 3 is a scaffolding installed under the bridge 2 for repairs and construction work.

[0039] Fig. 3 is a schematic diagram showing an example of the configuration of a bridge 2 and a suspended scaffolding 3. In Fig. 3, a deck 21 and a main girder 22 are components of the bridge 2. The deck 21 is a floor plate for receiving the load applied to the bridge 2. The main girder 22 is a beam that supports the load applied to the deck 21.

[0040] In FIG. 3, floor material 31 and hanging member 32 are components of suspended scaffolding 3. Floor material 31 is a member of suspended scaffolding 3 that serves as a scaffold provided for workers to perform their work. Hanging member 32 is a member of suspended scaffolding 3 that suspends and supports floor material 31 from above. As shown in FIG. 3, the upper end of hanging member 32 is fixed to deck 21 or main girder 22, and the lower end of hanging member 32 is fixed to floor material 31. As shown in FIG. 3, there may be a plurality of floor materials 31 and hanging members 32. Also, as shown in FIG. 3, floor materials 31 can be connected to form connected scaffolding 33. Also, as shown in FIG. 3, a point cloud data acquisition device 7 may be installed on suspended scaffolding 3.

[0041] As shown in Fig. 3, X and Z coordinates may be set in the space where the bridge 2 and the suspended scaffolding 3 exist. In Fig. 3, the X coordinate is a coordinate relating to one direction in which the floor material 31 is connected, and the Z coordinate may be a coordinate relating to a direction from the ground to the sky that is perpendicular to the direction of the X coordinate. Furthermore, the Y coordinate may be set as a coordinate that is perpendicular to the X and Z coordinates.

[0042] Figure 4 is a schematic diagram showing an example of a connected scaffolding 33 when the suspended scaffolding 3 is viewed from the side of the bridge 2. Each rectangle in Figure 4 represents a floor material 31. As shown in Figure 4, the connected scaffolding 33 may be formed, for example, by connecting rectangular floor materials 31 together.

[0043] 4, the connected scaffolding 33 has some areas where the floor material 31 is present and some areas where the floor material 31 is not present. Whether the connected scaffolding 33 has the floor material 31 or not varies depending on the construction situation of the suspended scaffolding 3.

[0044] In Fig. 4, nodes 34-1 and 34-2 each indicate a node 34 in the connecting scaffolding 33. The nodes 34 are points in the connecting scaffolding 33 where the floor materials 31 can be connected to each other. The nodes in Fig. 4 are points where the lower ends of the hanging members 32 are fixed to the floor materials 31. In Fig. 4, in addition to the nodes 34-1 and 34-2 indicated by black dots, all of the vertices of the rectangles representing the floor materials 31 in the connecting scaffolding 33 in Fig. 4 are nodes.

[0045] In the interlocking scaffolding 33, there is a corresponding floor material 31 for each node 34. For example, in Fig. 4, floor material 31-1 and floor material 31-2 are floor materials 31 corresponding to nodes 34-1 and 34-2, respectively. In addition to floor material 31-1 and floor material 31-2 shown in Fig. 4, different floor materials 31 may correspond to each node 34. For example, in the interlocking scaffolding 33 of Fig. 4, each floor material 31 may correspond to a node 34 located at the upper left vertex of a rectangle representing that floor material 31.

[0046] In Fig. 4, X and Y coordinates are set in the direction in which the floor materials 31 are connected on a plane showing the connected scaffolding 33. These X and Y coordinates correspond to the X and Y coordinates in the space in which the bridge 2 and suspended scaffolding 3 exist. Here, in Fig. 4, the X and Y coordinates are coordinates that can indicate a location on the connected scaffolding 33.

[0047] <VRデバイス4> The VR device 4 is a device that displays an output image 8, and is, for example, VR goggles that use publicly known technology. Here, the output image 8 is an image that represents structural information and axial force values ​​related to the suspended scaffolding 3.

[0048] <ARデバイス5> The AR device 5 is a device that displays an output image 8, and is, for example, AR glasses that use publicly known technology.

[0049] <Server 6> The server 6 is a device that stores information related to the safety assessment system 100. The server 6 transmits and receives various data to and from the safety assessment device 1. The server 6 may be a cloud server that uses a known virtual server technology, or may be a physical server. The server 6 may perform some or all of the functions of the safety assessment device 1.

[0050] <Point cloud data acquisition device 7> The point cloud data acquisition device 7 in Fig. 3 is a device that measures point cloud data of an area including the connected scaffolding 33. The point cloud data acquisition device 7 is, for example, a 3D laser scanner or a 3D camera. The point cloud data is a collection of measurement point data relating to an area including the connected scaffolding 33. The point cloud data acquisition device 7 may, for example, measure an area including the connected scaffolding 33 shown in Fig. 4. The point cloud data acquisition device 7 transmits and receives data to and from the safety assessment device 1.

[0051] FIG. 5 is a schematic diagram showing an example of the functional configuration of the safety assessment device 1. As shown in FIG.

[0052] 5, the safety assessment device 1 has, as its functional configuration, a load value acquisition unit 11, a structural information acquisition unit 12, an axial force value calculation unit 13, a safety determination unit 14, a point cloud data acquisition unit 15, an object information acquisition unit 16, an output image generation unit 17, and a display unit 18. Each element in FIG. 5 will be described below.

[0053] <Load value acquisition unit 11> The load value acquisition unit 11 is a means for acquiring a load value that indicates the magnitude of the load applied to the floor material 31 .

[0054] <Structural information acquisition unit 12> The structural information acquisition unit 12 is a means for acquiring structural information indicating the structure of the suspended scaffolding 3 based on the load value acquired by the load value acquisition unit 11. Specifically, the structural information is information including information regarding the structure of the connecting scaffolding 33 and information regarding the structure of the hanging members 32. Here, the information regarding the structure of the connecting scaffolding 33 is information regarding the shape of the connecting scaffolding 33 and the presence or absence of a floor material 31, as shown in FIG. 4. Furthermore, the information regarding the structure of the hanging members 32 is information indicating the positions to which both ends of each hanging member 32 are fixed in the suspended scaffolding 3 as shown in FIG.

[0055] <Axial force calculation unit 13> The axial force value calculation unit 13 is a means for calculating an axial force value indicating the magnitude of the axial force acting on the hanging member 32 based on the load value acquired by the load value acquisition unit 11 and the structural information acquired by the structural information acquisition unit 12.

[0056] <Safety determination section 14> The safety judgment unit 14 is a means for comparing the axial force value calculated by the axial force value calculation unit 13 with the allowable stress determined for each component of the suspended scaffolding 3, and judging whether the suspended scaffolding 3 meets the safety standards based on whether the calculated axial force value is less than the allowable stress of each component.

[0057] <Point cloud data acquisition unit 15> The point cloud data acquisition unit 15 is a means for acquiring point cloud data of an area including the connected scaffolding 33. The point cloud data acquisition unit 15 acquires the point cloud data by receiving the point cloud data measured by the point cloud data acquisition device 7 via the I / F 105.

[0058] <Object information acquisition unit 16> The object information acquisition unit 16 is a means for acquiring object information based on the point cloud data acquired by the point cloud data acquisition unit 15. Here, the object information is information that estimates objects that exist on the floor material 31, and may be information that indicates, for example, the number of people or the number of pieces of equipment that are on each of the floor materials 31 that make up the connected scaffolding 33.

[0059] <Output image generation unit 17> The output image generating unit 17 is a means for generating the output image 8. The output image 8 is an image that represents the structural information and axial force value related to the suspended scaffolding 3.

[0060] <Display section 18> The display unit 18 is a means for displaying the output image 8 on the VR device 4 or the AR device 5.

[0061] <First embodiment: safety assessment method> Next, an example of steps of a method for assessing the safety of the suspended scaffolding 3 using the safety assessment system 100 will be described as a first embodiment.

[0062] Fig. 6 is a flowchart showing an example of steps of a safety assessment method according to the first embodiment. The safety assessment method includes a load value acquisition step S11, a structural information acquisition step S12, an axial force value calculation step S13, and a safety determination step S14. Each step in Fig. 6 will be described below.

[0063] <Load value acquisition step S11> In load value acquisition step S11, the load value acquisition unit 11 acquires a load value indicating the magnitude of the load applied to the floor material 31. The load value acquisition unit 11 acquires a load value for each of the floor materials 31 that make up the connected scaffolding 33 in Fig. 4. The load value may be acquired from one stored in the storage device 104, or may be acquired from one input by the worker via the input device 108. Here, the unit of the load value may be kg.

[0064] The load value acquiring unit 11 acquires the load values ​​in the form of a data table. In addition, in the data table relating to the load values, virtually set load values ​​may be used, or actually measured load values ​​may be used.

[0065] Fig. 7 is an example of a data table showing load values ​​in the first embodiment. In the data table of Fig. 7, the value of each cell of the data table is the load value at each of a plurality of locations within an area including the connected scaffolding 33.

[0066] The data table shown in Fig. 7 is a data table relating to the loads acting on each floor material 31 in a connected scaffolding 33 formed by connecting a floor material 31 having dimensions of 1248 mm x 2496 mm and a floor material 31 having dimensions of 2496 mm x 2496 mm. The data table shown in Fig. 7 corresponds to the structure of the connected scaffolding 33 shown in Fig. 4.

[0067] In the data table shown in Fig. 7, each row corresponds to the X-direction distance, which is the distance related to the X coordinate in Fig. 4, and each column corresponds to the Y-direction distance, which is the distance related to the Y coordinate in Fig. 4. The data table shown in Fig. 7 is a data table in which the node 34-1 in Fig. 4 is taken as the origin and the X-direction distance and the Y-direction distance are considered.

[0068] Each cell in the data table shown in Fig. 7 corresponds to each floor material 31 that constitutes the connected scaffolding 33 shown in Fig. 4. For example, the top left cell in the data table shown in Fig. 7 corresponds to the floor material 31-1 in Fig. 4. The value in the top left cell is 100 kg, which indicates that the magnitude of the load applied to the floor material 31-1 in Fig. 4 is 100 kg. The other cells in the data table shown in Fig. 7 also correspond to one of the floor materials 31 in Fig. 4.

[0069] As shown in the data table of Fig. 7, even if there are locations on the connected scaffolding 33 shown in Fig. 4 where flooring 31 does not actually exist, a load value is entered in the data table shown in Fig. 7. For example, 0 may be entered in a cell of the data table corresponding to a location on the connected scaffolding 33 where flooring does not actually exist.

[0070] Furthermore, each cell in the data table shown in Fig. 7 may correspond to each node in Fig. 4. For example, the top left cell in the data table shown in Fig. 7 corresponds to node 34-1 in Fig. 4. Cells in the data table shown in Fig. 7 other than the cells shown here may also correspond to any of the flooring materials 31 in Fig. 4. Each node 34 corresponding to each cell in the data table shown in Fig. 7 may be assigned a node number, such as node 34-1 or node 34-2.

[0071] <Structural information acquisition step S12> In the structural information acquisition step S12, the structural information acquisition unit 12 acquires structural information indicating the structure of the suspended scaffolding 3 based on the load value acquired by the load value acquisition unit 11. Here, the structural information acquisition unit 12 may acquire information relating to the structure of the connecting scaffolding 33 and information relating to the structure of the hanging members 32, and combine these to acquire the structural information.

[0072] The structural information acquisition unit 12 acquires information about the structure of the connecting scaffolding 33. For example, the structural information acquisition unit 12 determines, based on the load value, locations within an area including the connecting scaffolding 33 where no load is applied. The structural information acquisition unit 12 determines that no floor material 31 is present in locations determined to be where no load is applied. The structure of the connecting scaffolding 33 can be estimated by determining the presence or absence of floor material 31 in each of multiple locations within an area including the connecting scaffolding 33 and aggregating the determination results for each floor material 31. Locations determined to be without floor material 31 are determined to be locations where no floor material 31 is present, such as the left and upper right portions of the connecting scaffolding 33 in FIG. 4 .

[0073] The structure information acquisition unit 12 may acquire information about the structure of the connecting scaffolding 33 based on the data table indicating the load values ​​acquired by the load value acquisition unit 11.

[0074] The structural information acquisition unit 12 may determine that there is no floor material 31 corresponding to the cell of the data table when the value of the cell of the data table shown in Fig. 7, i.e., the load value, is equal to or less than a predetermined reference value. Also, the structural information acquisition unit 12 may determine that there is a floor material 31 corresponding to the cell of the data table in the connected scaffolding 33 of Fig. 4 when the value of the cell of the data table shown in Fig. 7 is greater than the reference value. Hereinafter, the reference value used by the structural information acquisition unit 12 is assumed to be 0.

[0075] For each cell in the data table, by checking whether the load value is 0 or less, the structure of the linked scaffolding 33 can be estimated. For example, 7 In the data table in Figure 1, there are 10 cells with a value of 0 that have a weight value of 0 or less. 74, these cells are colored. At this time, the structural information acquisition unit 12 determines that the 10 floor materials 31 corresponding to the 10 cells with a value of 0 in the data table do not exist in the linked scaffolding 33. At this time, the structural information acquisition unit 12 estimates that the structure of the linked scaffolding 33 is such that the six floor materials 31 on the left side and the four floor materials 31 on the upper right side do not exist, as shown in the linked scaffolding 33 in FIG.

[0076] Here, the reference value is set to 0, but this is not limited to 0 and may be set to another value. For example, when taking into consideration measurement noise when preparing a data table based on measurements, etc., the reference value may be set to a value greater than or equal to 0. Through the above-mentioned processing, the structural information acquisition unit 12 acquires information regarding the structure of the connecting scaffolding 33.

[0077] Furthermore, the structural information acquisition unit 12 acquires information relating to the structure of the hanging member 32 .

[0078] The structural information acquisition unit 12 may determine that the lower ends of the hanging members 32 are not fixed to nodes 34 corresponding to locations in the connecting scaffolding 33 where it has been determined that no flooring 31 is present. For example, the structural information acquisition unit 12 may determine that the lower ends of the hanging members 32 are not fixed to nodes 34 corresponding to cells where it has been determined that no flooring 31 is present in the data table of FIG. 7. Furthermore, the structural information acquisition unit 12 may determine that the lower ends of the hanging members 32 are fixed to nodes corresponding to cells where it has been determined that no flooring 31 is present in the data table shown in FIG. The determination result regarding the fixation of the lower ends of the hanging members 32 may be acquired as a data table corresponding to FIG. 7 and stored in the storage device 104.

[0079] In addition, the structural information acquisition unit 12 may acquire, from the storage device 104, hanger member fixing information including information regarding the fixing location of the lower end of the hanger member 32.

[0080] Furthermore, the structural information acquisition unit 12 may acquire hanger member fixing information, including information about the fixing location of the upper end of the hanger member 32, from the storage device 104 or the input device 108. Here, the acquired hanger member fixing information may be in the form of a data table.

[0081] Furthermore, the structural information acquisition unit 12 may estimate the fixing point of the upper end of the hanging member 32 from the estimated fixing point of the lower end of the hanging member 32. For example, the structural information acquisition unit 12 may fix the upper end of the hanging member 32 to the deck slab 21 or the main girder 22 so as to connect the fixing point of the lower end and the deck slab 21 or the main girder 22 in the shortest way.

[0082] The structural information acquisition unit 12 acquires information about the fixing points at the lower ends and the fixing points at the upper ends of the hanging members 32 for each hanging member 32 or node 34, and by aggregating this information, acquires information about the configuration of the hanging members 32 in the suspended scaffolding 3. Through the above-mentioned processing, the structural information acquisition unit 12 acquires information about the structure of the hanging members 32.

[0083] The structural information acquisition unit 12 acquires structural information by combining information about the structure of the connecting scaffolding 33 obtained by the above-mentioned processing with information about the structure of the hanging members 32.

[0084] <Axial force value calculation step S13> In the axial force value calculation step S13, the axial force value calculation unit 13 calculates an axial force value indicating the magnitude of the axial force acting on the hanging member 32 based on the load value acquired by the load value acquisition unit 11 and the structural information acquired by the structural information acquisition unit 12. Here, the unit of the axial force value may be N or kg.

[0085] For example, when hanger members 32 are fixed to all of the nodes 34 corresponding to the four vertices of a rectangular floor material 31, the axial force value calculation unit 13 may perform calculations so that the axial force generated by the load applied to the floor material 31 is distributed among the four hanger members 32. For example, the axial force value calculation unit 13 may perform calculations so that the axial force generated by the load applied to the floor material 31 is distributed equally among the four hanger members 32, and calculate the axial force value.

[0086] Furthermore, without being limited to this form, the axial force value calculation unit 13 may perform calculations so that the axial force generated by the load applied to the floor material 31 is distributed to the multiple hanging members 32 supporting the connected scaffolding 33. Furthermore, the axial force value calculation unit 13 may take into account structural information and, based on the configuration of the connected scaffolding 33 and the hanging members 32, estimate how the axial force generated by the load applied to the floor material 31 will be distributed, and calculate the axial force in each hanging member 32 based on this.

[0087] The axial force value calculation unit 13 may perform the above calculation for each floor material 31 and calculate the axial force value indicating the axial force acting on each hanging member 32 by aggregating the calculations.

[0088] Furthermore, when estimating the axial force value in the hanging member 32, the axial force value calculation unit 13 may take into consideration the tension angle, length, etc. of the hanging member 32 fixed to the floor material 31 based on the structural information. Furthermore, the axial force value calculation unit 13 may acquire the axial force value corresponding to each hanging member 32 in the form of a data table, list, etc.

[0089] <Safety Determination Step S14> In safety determination step S14, the safety determination unit 14 compares the allowable stress with the axial force value. Here, the allowable stress is the upper limit of the axial force value for safe use of the hanging member 32. If the axial force value of the hanging member 32 is less than the allowable stress, the safety determination unit 14 determines that the hanging member 32 is being used in compliance with the safety standards.

[0090] The safety determination unit 14 may determine the allowable stress by acquiring a value input by an operator. For example, the safety determination unit 14 may refer to an allowable stress previously input by the operator to the storage device 104. The allowable stress acquired by the safety determination unit 14 may be a value appropriately set by the operator. Information regarding the allowable stress may be acquired in the form of a data table.

[0091] The safety determination unit 14 may also determine the allowable stress based on hanger information including at least one of information regarding the elastic modulus, cross-sectional area, and torsion coefficient of the hanger 32. Here, the hanger information is information regarding the specifications and characteristics of the hanger 32. The safety determination unit 14 may also use a value determined by laws and regulations, construction standards, etc. as the allowable stress.

[0092] Furthermore, the safety determination unit 14 may determine the allowable strength by calculating the force that each member can withstand and dividing this by a safety factor or the like. For example, the safety determination unit 14 may calculate the limit axial force value at which the hanging member 32 becomes unusable based on the hanging member information. The safety determination unit 14 may determine the allowable stress by dividing this limit axial force value by a safety factor, which is a value for providing a safety margin.

[0093] For example, the allowable stress increases when the cross-sectional area of ​​the hanging members 32 used in the suspended scaffolding 3 is large. For example, the allowable stress increases when the elastic strength of the hanging members 32 used in the suspended scaffolding 3 is high.

[0094] For example, the safety determination unit 14 may set a large value for the safety factor for determining the allowable stress for the hanging members 32 that exist around the locations of the connected scaffolding 33 where it has been determined that no floor material 31 exists, based on the structural information. For example, for the hanging members 32 fixed to the nodes 34 near the left and upper right portions of the connected scaffolding 33 in Fig. 4 where no floor material 31 exists, a large value for the safety factor may be set so that the allowable stress becomes small.

[0095] The safety determination unit 14 compares the axial force value with the allowable stress for each hanging member 32. For example, if the axial force value is less than the allowable stress, the safety determination unit 14 determines that the hanging member 32 satisfies the safety standard.

[0096] If there is a hanging material 32 whose axial force value is greater than the allowable stress, the safety judgment unit 14 may indicate to the worker, for example by displaying on the display device 109, that there is a hanging material 32 to which an axial force exceeding the allowable stress is applied.

[0097] For example, if a hanging member 32 with an axial force value greater than the allowable stress is found, the safety determination unit 14 may perform processing such as changing the colors of various displays on the display device 109. Also, a reference value other than the allowable stress may be set as appropriate. If a hanging member 32 with an axial force value greater than the reference value is found, the safety determination unit 14 may display or notify the worker of this fact.

[0098] The safety determination unit 14 may also obtain a margin based on the axial force value and the allowable stress. Here, the margin is an index for evaluating the degree of margin between the axial force value and the allowable stress. For example, the margin may be the difference between the allowable stress and the axial force value. In this case, if the margin is positive, the axial force value is equal to or less than the allowable stress, and therefore it can be evaluated that the suspension member 32 is being used in a manner that satisfies the safety standard. The margin may also be a value obtained by dividing the axial force value by the allowable stress. In this case, if the margin is less than 1, the axial force value is less than the allowable stress, and therefore it can be evaluated that the suspension member 32 is being used in a manner that satisfies the safety standard. These margins may be displayed on the display device 109.

[0099] The above steps complete the safety assessment method in the first embodiment. S11 to S14 may be executed repeatedly. S11 to S14 may be executed by a computer.

[0100] By using the safety assessment method in the first embodiment, the worker can check the structure of the suspended scaffolding 3 and the axial force values ​​of the suspension members 32 based on the load values ​​in the data table format.

[0101] Furthermore, the safety assessment method in the first embodiment does not use an analysis program using a 3D model, which requires a long time to perform analysis. Therefore, it is possible to quickly acquire load values, acquire structural information, acquire axial force values, compare allowable stresses with axial force values, and determine the safety of the components of the suspended scaffolding 3. Furthermore, because the safety assessment method in the first embodiment performs processing based on simple data tables, it is not necessary to prepare data in complex formats such as 3D design data, process data, and sensing data. Therefore, the safety assessment method in the first embodiment does not require a long time for data processing, and can quickly execute the processes of S11 to S14. From these points, the safety assessment method in the first embodiment makes it possible to assess the safety of the suspended scaffolding 3 in real time.

[0102] Furthermore, for example, by virtually setting the load to be applied to the floor material 31 and storing the data on the load value in a data table format, a worker can check in advance before construction work begins whether using the suspended scaffolding 3 will result in a dangerous situation during construction work of the suspended scaffolding 3.

[0103] According to the first embodiment, the structural information acquisition step S12 acquires structural information indicating the structure of the suspended scaffolding 3 based on the load value, the axial force value calculation step S13 calculates the axial force value based on the load value and the structural information, and the safety assessment step S14 compares the allowable stress with the axial force value. Therefore, the safety assessment method in the first embodiment can quickly determine whether the hanging members 32 of the suspended scaffolding 3 satisfy the safety standards without the need to use three-dimensional design data or data related to the construction process. As a result, the safety assessment method in the first embodiment makes it possible to grasp in real time the safety of the suspended scaffolding 3, such as which members are in a dangerous state, in a situation where the structure of the suspended scaffolding 3 and the loads acting on the members of the suspended scaffolding 3 change from moment to moment during construction.

[0104] According to the first embodiment, the load value acquisition step S11 acquires the load value at each of a plurality of locations within an area including the connected scaffolding 33, and the structure information acquisition step S12 determines that the floor material 31 is not present if the load value is equal to or less than a predetermined reference value, and determines that the floor material 31 is present if the load value is greater than the reference value. Therefore, the safety assessment method in the first embodiment can more quickly estimate the structure of the suspended scaffolding 3 without the need to use three-dimensional design data, data related to the construction process, etc. As a result, the safety assessment method in the first embodiment makes it possible to assess the safety of the suspended scaffolding 3 in more real time in situations where the structure of the suspended scaffolding 3 and the loads acting on the components of the suspended scaffolding 3 change from moment to moment during construction.

[0105] <Second embodiment: safety assessment method> Next, an example of steps of a method for assessing the safety of the suspended scaffolding 3 using the safety assessment system 100 will be described as a second embodiment.

[0106] FIG. 8 is a flowchart showing an example of steps of a safety assessment method according to the second embodiment. The safety assessment method includes a point cloud data acquisition step S21, an object information acquisition step S22, a load value acquisition step S23, a structure information acquisition step S24, an axial force value calculation step S25, a safety determination step S26, an output image generation step S27, and a display step S28. The main difference between the first and second embodiments is the use of a point cloud data acquisition unit 15, an object information acquisition unit 16, an output image generation unit 17, and a display unit 18. Each step in FIG. 8 will be described below. The content described in the first embodiment will not be described again.

[0107] <Point cloud data acquisition step S21> In the point cloud data acquisition step S21, the point cloud data acquisition unit 15 acquires point cloud data of an area including the connected scaffolding 33.

[0108] The point cloud data acquiring unit 15 may acquire the point cloud data by receiving the point cloud data measured by the point cloud data acquiring device 7 from the point cloud data acquiring device 7.

[0109] The point cloud data acquired by the point cloud data acquisition unit 15 may be stored in the storage device 104 or the server 6. Here, a plurality of point cloud data acquisition devices 7 in FIG. 3 may be installed on the connecting scaffolding 33. In this case, data measured by each point cloud data acquisition device 7 may be aggregated into one data by the point cloud data acquisition unit 15, thereby acquiring point cloud data for an area including the connecting scaffolding 33. Alternatively, the point cloud data acquisition device 7 may be installed at an end of the connecting scaffolding 33, for example, at the location of node 34-1 in FIG. 4, and one point cloud data acquisition device 7 may measure point cloud data for an area including the connecting scaffolding 33.

[0110] <Object information acquisition step S22> In the object information acquisition step S22, the object information acquisition unit 16 acquires object information about the object on the floor material 31 based on the point cloud data acquired by the point cloud data acquisition unit 15.

[0111] The object information acquisition unit 16 may detect and estimate objects present on each floor material 31 that constitutes the connected scaffolding 33 based on the point cloud data. For example, the object information acquisition unit 16 may estimate the number of workers working on the floor material 31. The object information acquisition unit 16 may also estimate the equipment placed on the floor material 31 and the number of such equipment.

[0112] The object information acquisition unit 16 aggregates the results of estimation regarding the objects on each floor material 31 and acquires the aggregated results as object information for the connected scaffolding 33. The object information may be acquired in the form of a data table. In this case, each cell of the data table is 7 The data may correspond to each cell of the data table shown in FIG.

[0113] <Load value acquisition step S23> In the load value acquisition step S23, the load value acquisition unit 11 acquires a data table relating to load values ​​based on the object information acquired by the object information acquisition unit 16.

[0114] For example, suppose that object information in the form of a data table is acquired by the object information acquisition unit 16. In this case, the load value acquisition unit 11 estimates the load value on each floor material 31 based on information about the objects present on each floor material 31. For example, if the object information acquisition unit 16 estimates that one worker is present on the floor material 31, the load value acquisition unit 11 may estimate the load on the floor material 31 to be 70 kg based on the object information and acquire the load value. Furthermore, for example, if the object information acquisition unit 16 estimates that two workers are present on the floor material 31, the load value acquisition unit 11 may estimate the load on the floor material 31 to be 140 kg based on the object information and acquire the load value.

[0115] The load value acquisition unit 11 acquires the load values ​​for each floor material 31, aggregates them, and displays them in FIG. 7 A data table showing load values ​​is obtained, as shown in FIG.

[0116] <Structural information acquisition step S24> In the structural information acquisition step S24, the structural information acquisition unit 12 performs the same process as in the structural information acquisition step S12 in the first embodiment to acquire structural information.

[0117] <Axial force value calculation step S25> In the axial force value calculation step S25, the axial force value calculation unit 13 performs the same process as the axial force value calculation step S13 in the first embodiment, and calculates the axial force value for each of the hanging members 32.

[0118] <Safety Determination Step S26> In the safety determination step S26, the safety determination unit 14 performs the same process as the safety determination step S14 in the first embodiment, comparing the allowable stress with the axial force value. The safety determination unit 14 also acquires a margin. Here, the margin is defined as the value obtained by dividing the axial force value by the allowable stress.

[0119] <Output image generation step S27> In the output image generating step S27, the output image generating unit 17 generates the output image 8. The output image 8 is an image that represents the structural information and axial force value related to the suspended scaffolding 3.

[0120] Fig. 9 is a diagram showing an example of an output image 8 in the second embodiment. Fig. 9 shows the structure of a floor slab 21, floor materials 31, and hanger members 32. In Fig. 9, the dashed two-dot line indicates the floor slab 21, the rectangle drawn with a solid line indicates the floor materials 31, and the solid line connecting the floor slab 21 and floor materials 31 indicates the hanger members 32. Also in Fig. 9, axial force values ​​indicating the magnitude of the axial force acting on each hanger member 32 are shown superimposed on each hanger member 32.

[0121] 9, the degree of safety margin for each hanging member 32 is reflected in the color of the figure displaying the value of the axial force. For example, the output image generating unit 17 may determine the color of the figure displaying the value of the axial force based on the degree of safety margin acquired by the safety determining unit 14.

[0122] For example, when the margin is 0.7 or less, the output image generating unit 17 may color the graphic displaying the axial force value blue to indicate that the axial force value has a margin relative to the allowable stress. Furthermore, when the margin is greater than 0.7 and less than or equal to 0.9, the output image generating unit 17 may color the graphic displaying the axial force value yellow to indicate that the axial force value has a slightly small margin relative to the allowable stress. Furthermore, when the margin is greater than 0.9, the output image generating unit 17 may color the graphic displaying the axial force value red to indicate that the axial force value has a small margin relative to the allowable stress or that the axial force value exceeds the allowable stress. Through such processing, the output image generating unit 17 can reflect in the output image 8 the extent to which the axial force value has a margin relative to the allowable stress and which hanging members 32 in the suspended scaffolding 3 are in a dangerous state.

[0123] Furthermore, the output image generation unit 17 may determine the color of the figure displaying the axial force value by associating a color gradation with the margin. Furthermore, when it can be determined based on the margin that the axial force value in the hanging member 32 is greater than the allowable stress (in the example of embodiment 2, when the margin is 1 or more), the output image generation unit 17 may generate the output image 8 so as to display an indication that the state of the suspended scaffolding 3 exceeds the safety standard. The output image generation unit 17 may perform the above-described determination and processing for each hanging member 32, as in the output image 8 of FIG. 9, and generate the output image 8.

[0124] The output image generation unit 17 generates the output image 8 so that the floor material 31 is not displayed for a location where it is determined based on the structural information that the floor material 31 is not present in the suspended scaffolding 3. Furthermore, the output image generation unit 17 generates the output image 8 so that the hanging material 32 is not displayed for a location where it is determined based on the structural information that the lower end of the hanging material 32 is not fixed.

[0125] Furthermore, the output image generating unit 17 may generate output images 8 as shown in FIG. 9 for a plurality of viewpoints.

[0126] The output image 8 generated by the output image generation unit 17 may be an image corresponding to the VR device 4 or the AR device 5. The output image 8 generated by the output image generation unit 17 may be a VR image, an AR image, or a 3D image. Furthermore, the output image generation unit 17 may generate a 3D model that allows the viewpoint to be moved or changed.

[0127] <Display step S28> In a display step S28, the display unit 18 displays the output image 8 generated by the output image generation unit 17 on the VR device or the AR device.

[0128] Furthermore, the display unit 18 may display the 3D model generated by the output image generation unit 17. Furthermore, the display unit 18 may display the output image 8 on the display device 109.

[0129] The display unit 18, in response to an appropriate operation by the worker, zooms in or zooms out the output image 8 when displaying the output image 8 on the display device 109, the VR device 4, or the AR device 5. Furthermore, the display unit 18, in response to an appropriate operation by the worker, switches to an output image 8 with a different viewpoint. When an operation to move the viewpoint is performed by an operation by the worker, the display unit 18 displays the output image 8 corresponding to the movement of the viewpoint on the VR device 4 or the like. Furthermore, when the display unit 18 displays a 3D model, the display unit 18 moves the viewpoint in the display of the 3D model based on an operation by the worker.

[0130] For example, when the output image 8 is displayed on the VR device 4, the worker can move the viewpoint of the output image 8 displayed on the VR device 4 to check the structure of the suspended scaffolding 3 and the axial force acting on the hanging members 32 from a different angle. This allows the worker to visually grasp the structure of the suspended scaffolding 3 as a whole. The worker can also visually grasp whether the suspended scaffolding 3 meets the safety standards.

[0131] The above steps complete the safety assessment method in the second embodiment. S21 to S28 may be executed repeatedly. S21 to S28 may be executed by a computer.

[0132] According to the second embodiment, the object information acquisition step S22 acquires object information that is an estimate of an object on the floor material 31 based on the point cloud data acquired in the point cloud data acquisition step S21, and the load value acquisition step S23 acquires a load value based on the object information. Therefore, the safety assessment method in the second embodiment can quickly acquire load values ​​based on the measurement of point cloud data, and quickly calculate the axial force value of the hanging member 32 based on the acquired load value. As a result, the safety assessment method in the second embodiment makes it possible to assess the safety of the suspended scaffolding 3 in real time, without the effort of preparing data related to load values, in a situation where the structure of the suspended scaffolding 3 and the loads acting on the components of the suspended scaffolding 3 change from moment to moment during construction.

[0133] According to the second embodiment, the output image generating step S27 generates an output image 8 that represents the structural information and the axial force value. Therefore, the safety assessment method in the second embodiment can visualize the state of the suspended scaffolding 3, including the structure of the suspended scaffolding 3 and the axial force acting on the hanging members 32. This allows the worker to visually confirm the safety of the suspended scaffolding 3 in real time.

[0134] According to the second embodiment, the output image generating step S27 generates the output image 8 based on the comparison between the allowable stress and the axial force value in the safety determining step S26. Therefore, the safety grasping method in the second embodiment can reflect in the output image 8 how much margin the axial force value has with respect to the allowable stress, and which hanging members 32 are in a dangerous state. This enables the worker to visually and in detail confirm the safety of the suspended scaffolding 3.

[0135] According to the second embodiment, the safety assessment method in the second embodiment includes a display step S28 of displaying the output image 8 on the VR device 4 or the AR device 5. Therefore, the safety assessment method in the second embodiment can visualize the structure of the suspended scaffolding 3, the axial force acting on the hanging members 32, and the results of the comparison between the allowable stress and the axial force value in a format that is easy for workers to understand. This enables workers to easily confirm the safety of the suspended scaffolding 3 in situations where the structure of the suspended scaffolding 3 and the loads acting on the components of the suspended scaffolding 3 change from moment to moment during construction.

[0136] Although embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, and are also included in the inventions and their equivalents as defined in the claims. [Explanation of symbols]

[0137] 1: Safety grasping device 2: Bridge 3: Suspended scaffolding 4: VR device 5: AR device 6: Server 7: Point cloud data acquisition device 8: Output image 11: Load value acquisition section 12: Structure information acquisition part 13: Axial force calculation section 14:Safety judgment section 15: Point cloud data acquisition unit 16:Object information acquisition unit 17: Output image generation unit 18: Display section 21: Floor slab 22: Main digit 31: Flooring 31-1: Flooring 31-2: Flooring 32: Hanging material 33: Interlocking scaffolding 34: Node 34-1: Node 34-2: Node 100: Safety awareness system 101: CPU 102:ROM 103:RAM 104: Storage device 105: Interface 106: Interface 107: Interface 108: Input device 109:Display device 110: Internal bus 111: Housing S11: Load value acquisition step S12: Structural information acquisition step S13: Axial force calculation step S14: Safety assessment step S21: Point cloud data acquisition step S22: Object information acquisition step S23: Load value acquisition step S24: Structural information acquisition step S25: Axial force calculation step S26: Safety assessment step S27: Output image generation step S28: Display step

Claims

1. A safety assessment system for assessing the safety of a suspended scaffolding that has a floor material and a suspension material and is installed under a bridge in a situation where the structure of the suspended scaffolding or the load applied to the members of the suspended scaffolding changes from moment to moment, a load value acquisition means for acquiring a load value indicating the magnitude of the load applied to the floor material; A structure information acquisition means for acquiring structure information indicating the structure of the suspended scaffolding based on the load value acquired by the load value acquisition means; an axial force value calculation means for calculating an axial force value indicating the magnitude of the axial force acting on the hanging member for each of the hanging members constituting the suspended scaffolding based on the load value acquired by the load value acquisition means and the structural information acquired by the structural information acquisition means; For each of the suspension members constituting the suspended scaffolding, a safety determination means is provided that compares the axial force value with an allowable stress that indicates the upper limit of the axial force value in order to safely use the suspension member. A safety awareness system characterized by:

2. The load value acquisition means acquires the load value at each of a plurality of locations within a range including the connected scaffolding to which the floor material is connected, The structural information acquisition means If the load value is equal to or less than a predetermined reference value, it is determined that the floor material is not present at the location, and if the load value is greater than the reference value, it is determined that the floor material is present at the location; acquiring the structural information based on the determination; 2. The safety assessment system according to claim 1,

3. A point cloud data acquisition means for acquiring point cloud data of a range including the connected scaffolding; an object information acquisition unit that acquires object information that is an estimate of an object on the floor material based on the point cloud data acquired by the point cloud data acquisition unit, The load value acquisition means acquires the load value based on the object information acquired by the object information acquisition means.

3. The safety assessment system according to claim 2, wherein:

4. Further comprising an output image generating means for generating an output image representing the structural information and the axial force value.

2. The safety assessment system according to claim 1,

5. The output image generating means generates the output image based on a comparison between the allowable stress and the axial force value in the safety determining means.

5. The safety assessment system according to claim 4, wherein:

6. The output image generated by the output image generating means may be displayed on a VR device or an AR device.

5. The safety assessment system according to claim 4, wherein:

7. A safety assessment program for assessing the safety of a suspended scaffolding having a floor material and a suspension material and installed under a bridge in a situation where the structure of the suspended scaffolding or the load applied to the members of the suspended scaffolding changes from moment to moment, a load value acquisition step of acquiring a load value indicating the magnitude of the load applied to the floor material; A structural information acquisition step of acquiring structural information indicating a structure of the suspended scaffolding based on the load value acquired by the load value acquisition step; An axial force value calculation step of calculating an axial force value indicating the magnitude of the axial force acting on the hanging member for each of the hanging members constituting the suspended scaffolding based on the load value acquired by the load value acquisition step and the structural information acquired by the structural information acquisition step; a safety determination step of comparing the axial force value with an allowable stress indicating an upper limit of the axial force value for safe use of each of the hanging members constituting the suspended scaffolding; to have a computer execute A safety awareness program that features:

Images