Construction support method, construction support program and construction support device

Abstract

To provide a construction support method allowing business operators to seamlessly and inexpensively perform work from design of reinforcing bars to construction.SOLUTION: Three-dimensional models of bent reinforcing bars include a first bent reinforcing bar family and a second bent reinforcing bar family allowing business operators to configure projects, where the first bent reinforcing bar family is shared by a plurality of projects. The first bent reinforcing bar family includes first bent reinforcing bar information relating to at least one bent reinforcing bar, and the second bent reinforcing bar family includes second bent reinforcing bar information relating to at least one bent reinforcing bar. As for the first reinforcing bar information, a center dimension of a bent part in the bent reinforcing bar can be set within a range restricted by a numerical expression based on a reinforcing bar diameter, while as for the second reinforcing bar information, a center dimension of the bent part in the bent reinforcing bar can be discretionarily set.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a construction support method, a construction support program, and a construction support device for supporting the construction of reinforcing bars, for example. [Background technology]

[0002] In recent years, the use of BIM (Building Information Modeling) has been proposed for the construction of buildings, complex facilities, etc. In BIM, parts are assembled in a virtual space, and various information, such as the weight of rebar and the completion date, is incorporated into the modeled building.

[0003] For example, Patent Document 1 discloses the creation of a construction drawing in which a three-dimensional interference check of the reinforcing bars to be placed has been performed in advance by creating a three-dimensional reinforcement model from a two-dimensional CAD drawing. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-253484 Summary of the Invention [Problem to be solved by the invention]

[0005] In reinforced concrete buildings, a large number of rebars of various shapes are used. In addition, many businesses are involved in the process from rebar design to processing, such as design companies (including architectural design offices), construction sites, and rebar processing companies.

[0006] For example, reinforcement drawings and schedules prepared by a design company are handed over to a construction site, where a processing ledger is created based on the reinforcement drawings and schedules. Furthermore, the construction site hands over the processing ledger to a rebar fabricator, who converts the processing ledger into a two-dimensional code (also known as a "QR code (registered trademark)"). The rebar fabricator then reads the two-dimensional code into a rebar processing machine and processes the rebar based on the information in the two-dimensional code. The rebar fabricator then delivers the processed rebars of various types to the construction site in predetermined quantities.

[0007] At each process related to the supply of rebars, the representation of information related to the dimensions of the rebars and units of numerical values ​​(information related to numerical representation) is converted to ensure smooth operation at each process. This information conversion is done manually, which results in information being separated between processes.

[0008] Manual information conversion is performed, for example, to convert numerical expressions in 3D data into numerical expressions that workers at construction sites or rebar processing companies are accustomed to using. Conventionally, the labor required for information conversion has increased costs, and there have been cases where human error has occurred or various estimated numerical values, such as weight and price, have become inaccurate.

[0009] An object of the present invention is to provide a construction support method, a construction support program, and a construction support device that enable work from design to construction of reinforcing bars to be performed seamlessly and at low cost. [Means for solving the problem]

[0010] (1) The construction support method according to the present invention is characterized in that it is a construction support method for a building using building information modeling, The 3D model of the bent rebar includes a primary and secondary bent rebar family that can be used to configure the project. The first curved reinforcing bar family is shared by a plurality of the projects; The first bent reinforcing bar family includes first bent reinforcing bar information relating to at least one bent reinforcing bar; The second bent reinforcing bar family includes second bent reinforcing bar information relating to at least one bent reinforcing bar; The first bending reinforcing bar information can be set within a range where the center dimension of the bending portion of the bending reinforcing bar is constrained by a formula based on the reinforcing bar diameter, The second bent reinforcing bar information means that the center dimension of the bent portion of the bent reinforcing bar can be set arbitrarily. (2) A feature of the construction support method according to the present invention is that the formula includes at least pi as a constant, The value of pi is used to at least two decimal places. (3) A feature of the construction support method according to the present invention is that, for the object relating to the first bent reinforcing bar family, the dimensions of the straight section in the first bent reinforcing bar information can be changed arbitrarily, but the length dimension of the bent section cannot be changed beyond the range constrained by the formula. (4) A feature of the construction support method according to the present invention is that the above formula differs depending on the diameter of the reinforcing bar. (5) A construction support program according to the present invention is characterized in that it causes a computer to execute any one of the construction support methods (1) to (4) above. (6) A construction support device according to the present invention is characterized in that it executes any one of the construction support methods (1) to (4) above or the construction support program (5) above. [Effects of the Invention]

[0011] According to the present invention, it is possible to provide a construction support method, a construction support program, and a construction support device that enable the supply of reinforcing bars to be carried out seamlessly and at low cost. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is an explanatory diagram showing the flow of information in the construction support system. [Figure 2]1A to 1C are explanatory diagrams showing examples of a three-dimensional model, a reinforcement drawing, and a summary table. [Figure 3] 10(a) and 10(b) are explanatory diagrams showing examples of rebar installation drawings. [Figure 4] FIG. 1 is a block diagram illustrating a schematic configuration of a construction support device. [Figure 5] 10 is a diagram illustrating an example of a reinforcing bar object. [Figure 6] 10 is an explanatory diagram showing an example of input parameters and an example of a numerical ticket corresponding to the input parameters. FIG. [Figure 7] 1(a) is an explanatory diagram showing the central dimensions of a U-shaped reinforcing bar, and FIG. 1(b) is an explanatory diagram showing the outer and inner dimensions of the reinforcing bar in FIG. [Figure 8] 1A is an explanatory diagram showing the center dimensions of the bent portion enlarged, and FIG. 1B is an explanatory diagram showing the center line of a U-shaped reinforcing bar with symbols assigned to each part. [Figure 9] (a) is a diagram showing an example of a summary table showing the length of each part of a U-shaped reinforcing bar using its outer dimensions, and (b) is a diagram showing an example of a summary table showing the length of each part of a U-shaped reinforcing bar using its center dimensions. [Figure 10] FIG. 10 is an explanatory diagram showing a U-shaped reinforcing bar in which the bent portion is changed to a right-angled shape. [Figure 11] (a) is an explanatory diagram showing the classification of three-dimensional models of bent reinforcing bars, (b) is an explanatory diagram showing the first bent reinforcing bar information, and (c) is an explanatory diagram showing the first bent reinforcing bar information and the second bent reinforcing bar information. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment and the drawings relating to this embodiment, components with the same reference numerals have the same structure or function.

[0014] <Basic configuration of Construction Support System 10> 1 shows a schematic configuration of a construction support system 10 according to one embodiment of the present invention. The construction support system 10 includes a data supply unit 12, a construction unit 14, and a processing unit 16. The data supply unit 12 may be provided by an information systems company, an architectural design office, or the like.

[0015] An example of the construction department 14 is a construction site where construction of a structure to be built (hereinafter referred to as "target structure") is carried out. An example of the processing department 16 is a rebar processing company that receives an order from the construction department 14, bends rebars, and delivers the manufactured rebars to the construction department 14.

[0016] The data supply unit 12 uses a software program for BIM (Building Information Modeling) (construction support program, hereinafter referred to as "BIM program") to create reinforcement drawings, schedules, and processing logs from a BIM model, as shown in FIG. 1. The data supply unit 12 also creates two-dimensional codes (also called "QR Codes (registered trademark)"). Specific information (data) handled by the data supply unit 12 will be described later.

[0017] Fig. 2 shows an example of various types of information created by the data supply unit 12. Fig. 2 shows a three-dimensional model (BIM model) 22 related to the reinforcing bars of a building, a reinforcement drawing 24 created from the three-dimensional model, and a summary table 26 created based on the reinforcement drawing 24. The three-dimensional model 22, the reinforcement drawing 24, and the summary table 26 shown in Fig. 2 are merely examples. The data supply unit 12 can create various types of three-dimensional model 22, the reinforcement drawing 24, and the summary table 26 other than those shown in the figure.

[0018] Figures 3(a) and (b) show an example of a rebar attachment drawing (a building with a beam-column joint) created based on this information. The 3D model 22 in Figure 2 and the building shown in the rebar attachment drawing in Figures 3(a) and (b) are also examples of "projects." A "project" is a model of the target building.

[0019] The data supply unit 12 can use a general personal computer (hereinafter referred to as "PC") as the construction support device 30 (FIG. 4). The construction support device 30 is communicably connected to the management computers (not shown) of the construction unit 14 and the processing unit 16 (FIG. 1) via a communication network (not shown). Examples of communication networks include the Internet, LAN, WAN, public telephone lines, base stations, mobile communication networks, and networks interconnected via gateways, etc. (including so-called clouds).

[0020] As shown in FIG. 4, the construction support device 30 includes a control unit 31, a storage unit 32, a communication unit 33, etc., and also includes an operation unit 34, a display unit 35, etc. as peripheral devices.

[0021] Although not shown, the control unit 31 is configured with a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), etc. The CPU of the control unit 31 loads various computer programs stored in the ROM or storage unit 32 onto the RAM and executes them. The control unit 31 may be any processing circuit or arithmetic circuit equipped with multiple CPUs, a multi-core CPU, a GPU (Graphics Processing Unit), a microcomputer, volatile or non-volatile memory, etc.

[0022] The control unit 31 has a 3D model creation unit 36, a reinforcement drawing creation unit 37, a summary table creation unit 38, a reinforcing bar information calculation unit 39, and a 2D code creation unit 40. The 3D model creation unit 36 ​​creates information for the 3D model 22 shown in Fig. 2. The reinforcement drawing creation unit 37 creates information for the reinforcement drawing 24 (Fig. 2), and the summary table creation unit 38 creates information for the summary table (Figs. 2, 9(a) and (b)).

[0023] The reinforcing bar information calculation unit 39 calculates reinforcing bar information used in the 3D model creation unit 36, the reinforcement bar arrangement drawing creation unit 37, the summary table creation unit 38, and the 2D code creation unit 40. The 2D code creation unit 40 creates information on the 2D code to be displayed on a management tag (picture tag) or the like.

[0024] The 3D model creation unit 36, the reinforcement drawing creation unit 37, the schedule creation unit 38, the reinforcing bar information calculation unit 39, and the 2D code creation unit 40 are functional modules executed by the CPU of the control unit 31 in accordance with the BIM program. Of these functional modules, the schedule creation unit 38, the reinforcing bar information calculation unit 39, and the 2D code creation unit 40 will be described in detail later.

[0025] The storage unit 32 is a non-volatile storage unit that stores various types of information and includes semiconductor memories such as ROM and RAM, a hard disk drive (HDD), or a solid state drive (SSD), etc. The storage unit 32 stores an operating system program, driver programs, application programs, data, etc. that are used for processing in the processor (here, the control unit 31).

[0026] The program stored in the storage unit 32 may be provided by a non-transitory recording medium (not shown) on which the program is readably recorded. Examples of the recording medium include a CD-ROM, a USB (Universal Serial Bus) memory, an SD (Secure Digital) card, a micro SD card, and a portable memory such as CompactFlash (registered trademark). In this case, the control unit 31 reads the program from the recording medium using a reading device (not shown) and installs the read program into the storage unit 32.

[0027] The program stored in the storage unit 32 may be provided by communication via the communication unit 33. In this case, the control unit 31 obtains the program through the communication unit 33 and installs the obtained program in the storage unit 32.

[0028] The communication unit 33 has an interface circuit for communicating with a management computer (not shown) of the construction unit 14 (FIG. 1) via a communication network. The communication unit 33 performs wired or wireless data communication in accordance with a predetermined communication protocol. For example, when information to be transmitted to the construction unit 14 is input from the control unit 31, the communication unit 33 transmits the input information to the construction unit 14. The communication unit 33 outputs information received from the construction unit 14 via the communication network to the control unit 31.

[0029] An operation unit 34 and a display unit 35 are connected to the construction support device 30. The operation unit 34 is an operation input means such as a keyboard, a mouse, or a touch panel. Although only one operation unit 34 is shown in FIG. 4, the operation unit 34 collectively represents these operation input means. The display unit 35 is a display means such as a general display device.

[0030] A general PC can also be used as the management computer (not shown) for the construction unit 14 (Fig. 1). Similarly, the processing unit 16 (Fig. 1) also uses a management computer (not shown) to communicate with the construction unit 14 via a communication network. The management computers for the construction unit 14 and processing unit 16 can have the same hardware configuration as the construction support device 30.

[0031] In the control unit 31 associated with the construction support device 30 (FIG. 4) of the data supply unit 12, the reinforcing bar information calculation unit 39 has the function of performing various calculations related to reinforcing bars (described later). The reinforcing bar information calculation unit 39 also has functions such as rounding up and down numerical values ​​and converting numerical values ​​between units such as millimeters, centimeters, and meters. The reinforcing bar information calculation unit 39 also has the function of calculating the length of reinforcing bars and calculating the weight and estimated price of reinforcing bars from the length of the reinforcing bars. The reinforcing bar information calculation unit 39 may perform numerical calculations using a spreadsheet software program (hereinafter referred to as "spreadsheet software") installed in the construction support device 30.

[0032] The two-dimensional code creation unit 40 creates a two-dimensional code based on the rebar information obtained by the rebar information calculation unit 39. The two-dimensional code contains information on the dimensions of each part of the rebar to be produced. The two-dimensional code is sent to the processing unit 16 via the construction unit 14 and read into a rebar processing machine (reference numeral 17 in FIG. 1) in the processing unit 16. The rebar processing machine 17 bends straight rebar before processing to produce rebar with the desired shape and dimensions. Here, the rebar processing machine 17 in FIG. 1 is shown merely as an icon and does not specifically represent the configuration of the rebar processing machine 17 actually used in the processing unit 16.

[0033] Furthermore, the control unit 31 has various functions other than the functions of the reinforcing bar information calculation unit 39 and the two-dimensional code creation unit 40, and the description of these will be omitted here.

[0034] <Hierarchical structure of rebar objects> Figure 5 shows an example of a rebar object handled in a BIM program. In a BIM program, rebars are classified by shape, and each classification constitutes a "family." The rebar object shown in the example in Figure 5 is classified into a "family" of rebars with a U-shaped configuration in katakana.

[0035] The above-mentioned "family" refers to one level in various types of information with a hierarchical structure. In the BIM program of this embodiment, the model of the target building is defined as a "project," and under this "project," levels such as "category," "family," and "type" are defined.

[0036] Of these hierarchies, "category" is the relatively highest hierarchical level, and "type" is the relatively lowest hierarchical level. "family" is a hierarchical level positioned between "category" and "type."

[0037] For example, the "category" defines classifications such as "pillar," "wall," and "window." Furthermore, the "category" of "pillar" defines "families" such as "cylinder" and "rectangular pillar."

[0038] The "Cylinder" "Family" has "Types" defined, such as "Cylinder (Diameter 450mm)" and "Cylinder (Diameter 600mm)". The "Rectangular Column" "Family" has "Types" defined, such as "Rectangular Column (450mm x 600mm)" and "Rectangular Column (600mm x 750mm)".

[0039] In this embodiment, a "category" of "reinforcing bars" is created. In the "category" of "reinforcing bars," several "families" related to reinforcing bars of U-shape, square shape, and other shapes are defined. For each type of "family," many types with different sizes of common parts are defined.

[0040] In addition to these, various other "categories," "families," and "types" are defined in the BIM program. Information on objects related to various "categories," "families," and "types" is called up from the storage unit 32 (Fig. 4) and used. In addition, the operator of the BIM program can add "categories," "families," and "types" that are not pre-registered in the library to the library as needed.

[0041] For example, there are types of "families," such as "system families," "in-place families," and "embeddable families." Of these, "system families" are basic families, and include walls, floors, roofs, ceilings, and stairs.

[0042] An "in-place family" is a family that allows the operator to change the shape of an object. A "loadable family" is a family that is created individually and loaded from a library into a project file (project file) for use. Examples include windows, doors, furniture, and equipment from a specific building material manufacturer. It is possible to create parts that make up a unique design in a building using an "in-place family," and create general parts that can be used in multiple buildings using a "loadable family."

[0043] Such a function for multiple types of families may be provided in conventional general-purpose BIM programs. However, the inventors have defined new parameters for rebar objects that have not been previously available, making BIM programs even more effective. This point will be explained below.

[0044] <Rebar object parameters> In the example of Figure 5, for rebar objects (hereinafter referred to as "rebar objects") of the same classification (here, this corresponds to the "family" of "U-shaped") but different sizes (corresponding to the "type"), the following information is displayed: "number," "diameter," "shape," "dimension a," "dimension b," "dimension c," "dimension e," "rebar length," "unit weight," "weight per piece," "number of pieces," and "rebar weight."

[0045] Each rebar object is assigned detailed length information (such as "dimension a," "dimension b," "dimension c," "dimension d," and "dimension e") that determines the diameter, weight, and shape of the rebar. In the example of Fig. 5, dimension a is the length of the straight line portion (hereinafter referred to as "central straight line portion") that forms the center of Fig. 5.

[0046] The dimensions b and d are the lengths of the straight line portions located to the left and right of the central straight line portion in Fig. 5 (herein referred to as the "left straight line portion" and the "right straight line portion"), and the dimensions c and e are the lengths of the arc-shaped portions (hereinafter referred to as "bent portions") connecting the central straight line portion to the left and right straight line portions in Fig. 5.

[0047] The example in Figure 5 shows three types of rebar objects (F1 to F3) that differ from one another in dimension a or dimension b. Various pieces of information related to the rebar objects (here, F1 to F3) function as parameters. When the operator changes various pieces of information related to the rebar objects (here, F1 to F3), the values ​​of the corresponding parameters are rewritten, and the type of the rebar object is changed.

[0048] <Parameter input example> Fig. 6 shows an example of a screen display during input work related to the parameters of a reinforcing bar object. A U-shaped reinforcing bar object 42A is displayed on the left side of Fig. 6. The "defined parameters" and arrows shown for the reinforcing bar object 42A are added for the purpose of explaining this embodiment.

[0049] For the rebar object 42A, as indicated by the text and arrows labeled "defined parameters," when the operator inputs the dimensions of the straight sections (sections a to c), various parameters including information on the bent sections (hereinafter referred to as "bent section information") are automatically calculated and displayed in the parameter table 42B shown on the right side of Figure 6.

[0050] In the example of Fig. 6, the following values ​​are input for the straight portion of the reinforcing bar object 42A: a (dimension of portion a) = 1200 [mm], b (dimension of portion b) = 600 [mm], and c (dimension of portion c) = 1200 [mm]. Accordingly, in addition to the input dimensions a to c, the parameter table 42B displays bending portion information such as the bending diameter (radius of the arc in the bending portion) and straight portion information related to the straight portion. Here, in the example of Fig. 6, unlike the example of Fig. 5, portion c is the straight portion on the left side.

[0051] The dimension value to be entered is the sum of the straight portion and the bent portion. In the example of FIG. 6, the rebar diameter is 10 [mm], and the bending diameter calculated based on this rebar diameter is 27.6 [mm]. If a dimension value of 1200 [mm] is entered for part a, the breakdown of the dimension of part a is the bending diameter + the exact length of the straight portion in millimeters (hereinafter referred to as "millimeter units", one decimal place) + bending diameter. Specifically, the breakdown of the dimension of part a is 27.6 [mm] + 1144.8 [mm] + 27.6 [mm] = 1200 [mm].

[0052] In this way, by inputting a dimension value including the bending diameter (here, 1200 [mm]) as the dimension value of the straight portion, various parameters are calculated by distinguishing between the dimensions of the straight portion in millimeters (straight portion information) and bending portion information such as the bending diameter.

[0053] Note that although the U-shaped rebar object 42A is used as an example here, for rebar objects of other families (not shown), by inputting the dimensions of the straight section, straight section information and bend section information in millimeters can be calculated.

[0054] In BIM programs, parameter values ​​can be freely changed. It is also possible to perform calculations between parameters (addition, subtraction, multiplication, division, function calculations including parameters, etc.). BIM programs also use new parameters to create various information for rebar objects. Furthermore, BIM programs tally various information based on the created information.

[0055] <New parameter> The BIM program in this embodiment has a function to calculate the length and weight of rebars using the center dimensions (described later) of rebars having bent portions (also called "bent rebars"). The construction support method of this embodiment, which is carried out using the BIM program, uses center dimension information of the bent rebar in millimeters and outer surface dimension information in units larger than millimeters (here, centimeters) as parameters related to the 3D model of the bent rebar, and includes a 3D model information creation process that creates 3D model information related to the 3D model, and a rebar production information creation process that creates rebar production information based on the 3D model information, and at least the 3D model information creation process creates the 3D model information including the center dimension information.

[0056] As will be described later, the "center dimension information" corresponds to information that represents the dimensions (length) of a portion along the center line of the reinforcing bar (such as center line C in Figure 7(a)). The "outer surface dimension information" corresponds to information that represents the dimensions (length) of a portion along the outer surface of the reinforcing bar (such as outer surface 47 in Figure 7(b)). The "3D model information" corresponds to information about the 3D model of the bent reinforcing bar (such as the information about the bent reinforcing bar shown in the schedule table in Figure 9(b)). The "3D model information creation process" is a process that creates the "3D model information". The "reinforcing bar production information" corresponds to information that is created based on the "3D model information" (such as a 2D code or information used to create the 2D code). The "reinforcing bar production information creation process" is a process that creates the "reinforcing bar production information". Figures after Figure 7 will be described later.

[0057] In addition, the construction support method of this embodiment includes, at least in the rebar production information creation process, a rebar production information output process that creates rebar production information including outer surface dimension information, and converts the rebar production information into a readable code (such as a two-dimensional code) that can be read by a reading device (such as an optical two-dimensional code reader) and outputs it.

[0058] Furthermore, the construction support method of this embodiment includes a length calculation step of calculating length information of the bent rebar using center dimension information, and a weight calculation step of calculating weight information of the bent rebar based on the length information. "Length information of the bent rebar" is information that represents the length (total length) of the rebar. "Weight information of the bent rebar" is information that represents the weight of the rebar.

[0059] The new parameters defined in this embodiment are information about the center dimensions of the bent parts (parts c and e in the example of FIG. 5) in the rebar object. Specifically, the new parameters are various information such as the center dimensions of the bent parts in millimeters, and the length and weight of the rebar calculated using these center dimensions.

[0060] The bending diameter, which is one piece of bending section information, is calculated as a value using the centerline dimension of the rebar. Figure 7(a) shows a schematic diagram of the centerline dimension of a U-shaped rebar object. In the example of Figure 7(a), the centerline dimension is represented by the length of the centerline C, which is a dashed line, rather than a specific numerical value or symbol.

[0061] 7(a), the reinforcing bar object 46 is composed of a central straight section (section a), left and right straight sections (sections b and d), and bent sections (sections c and e). The center dimension can be said to be the length of an imaginary line (center line C) that passes through the center of the reinforcing bar object 46, assuming the reinforcing bar diameter of the reinforcing bar object 46.

[0062] The dimensions (outer surface dimensions) of the surface (outer surface) 47 of the reinforcing bar object 46 that is outside the center line C are dimensions that are outside the center dimension and are larger than the center dimension. FIG. 7(b) schematically shows the outer surface 47 by a thick line 47a. The outer surface dimensions are represented by the length of the thick line 47a that indicates the outer surface 47. The reinforcing bar object 46 illustrated here has a cross section that is nearly perfectly circular. Therefore, the outer surface 47 in FIG. 7(b) corresponds to the ridge line that is outside the center line C.

[0063] 7(b), a surface (inner surface) 48 inside the center line C of the rebar object 46 is schematically shown by a thick line 48a. The dimension of the inner surface 48 (inner surface dimension) is represented by the length of the thick line 48a indicating the inner surface 48. The inner surface 48 corresponds to a ridge line inside the center line C.

[0064] The outer surface 47 is located outside the center line C. Therefore, the outer surface dimension is larger (longer) than the center dimension. The inner surface 48 is located outside the center line C. Therefore, the inner surface dimension is smaller (shorter) than the center dimension.

[0065] FIG. 8(a) shows an enlarged view of one bent portion (portion c) of the reinforcing bar object 46. The length of the bent portion is defined as the length of the center line Cc at the bent portion. The length (total length) of the reinforcing bar object 46 is defined as the length of the center line C. As shown in FIG. 8(b), the length (total length) of the reinforcing bar object 46 is represented by the sum of the length of the center line Ca at the central straight portion, the lengths of the center lines Cb and Cd at the left and right side portions, and the lengths of the center lines Cc and Ce at the two bent portions.

[0066] The length of the bent portion (the length of the center line Cc and / or the length of the center line Ce, which are the central dimensions) is one piece of bent portion information. In this embodiment, the function of the spreadsheet creation unit 38 makes it possible to create a spreadsheet that does not include bent portion information (FIG. 9(a)) and a spreadsheet that includes bent portion information (FIG. 9(b)).

[0067] Fig. 9(a) shows an example of a schedule that does not include bending part information. In the example of Fig. 9(a), the "number" representing the reinforcing bar object that has the same shape as the reinforcing bar object 42A in Fig. 6 is "F2," and the "shape" of this reinforcing bar object F2 is represented by "C-1."

[0068] The symbol F2 is also used in Figure 5. Figure 5 shows information about a different reinforcing bar object from the reinforcing bar object shown in Figure 9(a). Therefore, even though the symbols used are the same, the dimensions of each part of the reinforcing bar object F2 in Figure 9(a) and the reinforcing bar object F2 in Figure 5 are different.

[0069] For the reinforcing bar object in FIG. 9(a) (hereinafter referred to as "reinforcing bar object F2"), the dimension of part a is a = 500 [mm]. Furthermore, the dimensions of parts b and c, which are the left and right straight sections, are b = 150 [mm] and c = 150 [mm]. In contrast, for the reinforcing bar object F2 in FIG. 5, the dimensions of the corresponding parts a, b, and d are 8,036 [mm], 673 [mm], and 1,740 [mm]. Furthermore, parts c and e, which are bent sections, are defined in FIG. 5, but no bent sections are defined in FIG. 9(a).

[0070] In the schedule of Figure 9(a), the "rebar length" of the rebar object F2 is 750 [mm]. The value of a+b+c for the rebar object F2 is 800 (= 500 + 150 + 150) [mm]. However, the reason why the "rebar length" is 750 [mm] in the schedule of Figure 9(a) is to take into consideration ease of work when using the schedule of Figure 9(a) at a construction site.

[0071] In other words, centimeters (cm) are usually used as a unit of length at construction sites. In other words, centimeters are the unit used to share information and communicate among the people involved at construction sites.

[0072] For this reason, even if the exact length of the rebar required in millimeters (in millimeters) is, for example, 741 [mm], the number used at the construction site will be 750 [mm] (= 75 [cm]), which is the number rounded up to the next millimeter. Also, if the number used at the construction site were rounded down to, for example, 740 [mm] (= 74 [cm]), it is possible that the rebar will be insufficient in length or strength, so the rounded up number is usually used.

[0073] For these reasons, the summary table in the example of FIG. 9(a) displays a value of 750 [mm] as the "reinforcing bar length" for the reinforcing bar object F2.

[0074] The value of 750 [mm] for this "rebar length" is rounded up so that the last digit in millimeters is 0 (zero). Therefore, construction site personnel can convert from millimeters to centimeters by mentally dividing the value of 750 [mm] by 10. Therefore, it is easy to convert from millimeters to centimeters at the construction site.

[0075] In addition, the relationship between the numerical values ​​a=500[mm], b=150[mm], and d=150[mm] for the rebar object F2 in Figure 9(a) and the numerical value of 750[mm] for the "rebar length" has also been determined taking into consideration the ease of work at the construction site.

[0076] Specifically, at a construction site, a single straight rebar is placed on a rebar processing machine (hereinafter referred to as a "bending machine") and processed. Various common bending machines can be used. When a U-shaped rebar is produced based on the numerical values ​​of the rebar object F2 in FIG. 9(a), the rebar is processed so that the lengths of the a portion, the b portion, and the d portion are 500 mm (= 50 cm), 150 mm (= 15 cm), and 150 mm (= 15 cm), respectively.

[0077] Figure 10 shows a schematic representation of the information required for workers performing processing work. Comparing Figure 10 with Figure 7(a), the arc-shaped bent sections (sections c and e) in Figure 7(a) have been changed to right angles in Figure 10. As shown in Figure 10, workers can produce the desired type of rebar by performing processing work while recognizing the dimensions of the bent sections (sections c and e) in Figure 7(a) included in the straight sections (sections a to c). The values ​​used by workers at the construction site during work are the values ​​of the outer surface dimensions.

[0078] As described above, the outer surface dimensions are greater than the central dimensions. Consider a rebar object 46A in which the bent portions (portions c and e) of the rebar object 46 shown in Fig. 7(a) are changed to right-angled shapes, and the bent portions are straightened, as shown in Fig. 10. The length (outer surface dimensions, central dimensions, and inner surface dimensions) of this rebar object 46A is longer than that of the rebar object 46 in Fig. 7(a) in which the bent portions are arc-shaped.

[0079] In the summary table in Figure 9(a), part a, part b, and part d are 500 [mm], 150 [mm], and 150 [mm], respectively. The sum of these values ​​is 800 (= 500 + 150 + 150) [mm].

[0080] However, the workers at the construction site prepare a straight rebar (rebar before processing) of 750 mm (= 75 cm) according to the "rebar length" value in the schedule in Figure 9(a). Furthermore, the workers at the construction site process the rebar so that the outer dimensions of parts a, b, and d are 50 cm, 15 cm, and 15 cm, respectively. As a result, a U-shaped rebar is produced whose actual length (total length based on the center dimension) is shorter than 800 mm, which is the sum of parts a, b, and d on the schedule, and is also shorter than the "rebar length" value.

[0081] In this way, the numerical information of 750 [mm] for "rebar length" in the summary table of Figure 9(a) was created taking into consideration the ease of work at the construction site. In addition, in the summary table of Figure 9(a), the values ​​of parts a, b, and d are calculated to be larger than the actual length of each part of the rebar to be manufactured, taking into consideration the length of the bent part calculated based on a predetermined formula (the length of the bent part based on the center dimension).

[0082] The schedule in Figure 9(b) displays more accurate dimensional information than the schedule in Figure 9(a), which prioritizes convenience at the construction site. In the example in Figure 9(b), the "shape" of the reinforcing bar object F2 in Figure 9(a) is "C-1," just like in Figure 9(a). Hereinafter, the reinforcing bar object in Figure 9(b) whose "shape" symbol is displayed as "C-1" will be referred to as the "reinforcing bar object C-1" to distinguish it from the reinforcing bar object F2 in the schedule in Figure 9(a).

[0083] In the schedule of Fig. 9(b), the symbols a to e assigned to each part of the rebar object C-1 are the same as those assigned in Fig. 5. Specifically, the central straight section is designated as part a, the straight sections on the left and right are designated as parts b and d, and the bent sections are designated as parts c and e.

[0084] In the example schedule shown in Figure 9(b), the dimension of part a of rebar object C-1 is a = 409 [mm]. Furthermore, the dimensions of parts b and d of rebar object C-1 are b = 105 [mm] and d = 105 [mm]. The dimensions of parts c and e, which are bent parts, are c = 61 [mm] and e = 61 [mm].

[0085] The following formula (1) is used to calculate the length of the bends (parts b and d) in the family of rebar object C-1. In the example of Figure 9(b), the rebar diameter (diameter) of rebar object C-1 is 13 mm. (Bend length) = 1.5 × π (circumference constant) × (rebar diameter) Equation (1)

[0086] Substituting the "diameter" value of 13 mm into formula (1), the length of the bent part (length of part b = length of part d) is 1.5 x π (= 3.14) x 13 = approximately 61.23. Rounding the obtained value to the nearest integer gives a value of 61 mm, which is displayed in the "c" and "e" columns of the summary table in Figure 9(b).

[0087] The formula for calculating the length of the bend (length of part c and part d) may vary depending on the family of the reinforcing bar.

[0088] In the example in Figure 9(b), the value of a+b+c+d+e for rebar object C-1 is 741 (=409+105+61+105+61) [mm]. The calculated value of 741 [mm] is displayed as "rebar length" as 750 [mm]. This is the value obtained by rounding up the calculated "rebar length" value in millimeters so that the last digit is 0 (zero).

[0089] In this way, by using the numerical values ​​of the bending parts displayed in the summary table in Figure 9(b), a more accurate "rebar length" can be calculated. Information on the bending parts (parts c and e) (bending part information) is obtained by incorporating a routine into the BIM program that performs calculations using a formula such as Equation 1, and then having the rebar information calculation unit 39 (Figure 4) perform the calculations.

[0090] The BIM program contains mathematical formulas for bending rebar in various families. For example, a designer can select a family and input a "diameter" value to calculate bending information. Then, by inputting values ​​for other parameters (lengths of parts a, b, and d) related to the rebar object (here, rebar object C-1), a more accurate "rebar length" can be calculated.

[0091] The BIM program calculates the information of various rebar objects (3D model information, rebar manufacturing information, center dimension information, outer dimension information, etc.) using the methods described above.The BIM program then combines the information of various rebar objects and other "category" information to create a 3D model of the project (Figure 2).

[0092] To accurately calculate and display the length of rebar, it is effective to perform calculations using the centerline dimensions, as in this embodiment. However, at the construction site of the construction unit 14 (Fig. 1), the work of dividing the rebar diameter by 2 to calculate the distance from the centerline and then subtracting or adding this calculated value to the dimensions given in a schedule or the like to accurately determine the required length of rebar is cumbersome for workers and reduces work efficiency. For this reason, it is difficult to perform work based on the centerline dimensions of the rebar at the construction site, and work based on the outer surface dimensions, which is relatively easy to perform, is performed.

[0093] Furthermore, if the summary sheet (Figure 9(a)) provided to the construction site indicates that construction must take into account the length of the bent section, complicated confirmation work using the rebar diameter and pi will be required at the construction site, increasing the possibility of human error.

[0094] Furthermore, in the reinforcement drawing (Figure 2) that is the basis for creating the summary table, bends are often not shown in the drawing. Also, in 3D models, they may be hidden in the projection direction and cannot be seen unless the viewpoint of the 3D model is changed. For this reason, it is difficult to calculate the center dimensions of bends after the fact.

[0095] However, as in the construction support system 10 of this embodiment, by generating information on reinforcing bar objects using the center dimensions of the bending section as parameters in the data supply unit 12, which is the most upstream information source, it is possible to create accurate information on reinforcing bar objects in a centralized manner without having to determine the dimensions of the bending section from a 3D model or have the reinforcing bar processing company calculate the dimensions of the bending section.

[0096] <Use of 2D code> The BIM program converts the rebar object information into a 2D code for operating a bending machine. The 2D code created by the BIM program is printed on a management tag (picture tag) and attached (or can be pasted) to the straight rebar product before it is bent. The 2D code printed on the management tag is read, for example, by an optical 2D code reader, and input as processing information into the bending machine. The bending machine operates based on the input processing information, bending the straight rebar to produce the desired shape.

[0097] <Weight and price estimates> Furthermore, the BIM program calculates the weight of the rebar using information on the "rebar length" and "diameter," which includes information on the length of the bent part based on the center dimension, as shown in the example schedule in Figure 9(b). The weight of the rebar can be calculated using the following formula (2). The specific gravity of steel, which is the material used to make rebar, is about 7.85. π / 4×(diameter [mm]) 2 × (rebar length [mm]) × (specific gravity of rebar material) × 10 6 ...Equation (2)

[0098] This calculation of the weight of rebars can be performed for all rebars used in the 3D model. Therefore, the total weight of multiple rebars can be calculated by calculating and adding up the weights of all rebars to be included in the weight calculation. In addition, the price of the rebar can be calculated by multiplying the calculated weight by the unit price of the material (price per unit weight). These calculations are performed using accurate bending section information, which allows for more accurate calculation of estimated weight and price.

[0099] <Classification of rebar objects based on tolerance of changes> The BIM program in this embodiment has the function of calculating the length and weight of rebars using the center dimensions of bent rebars (Figure 7(a)). It is capable of handling multiple types of rebar objects with different tolerances for dimension changes.

[0100] 11(a) to (c) show schematic diagrams of classification of rebar objects based on the tolerance for change. In this embodiment, the construction support method performed using a BIM program is as follows: As shown in FIG. 11(a), the 3D model of the bent rebar includes a first bent rebar family and a second bent rebar family that can configure a project.

[0101] The "project" is a model of the target building. The "first curved reinforcing bar family" and the "second curved reinforcing bar family" are families related to curved reinforcing bars that are classified as different families.

[0102] The first bent rebar family is shared by multiple projects, as shown in Figure 11(b). In Figure 11(b), the first bent rebar information 1 is commonly used in Project 1 and Project 2, which are different projects. For example, when the same U-shaped rebar (e.g., the rebar shown in Figure 7(a)) is used in a project for the beam-column joint shown in Figure 3(a) (or the beam-column joint shown in Figure 3(a)), this corresponds to the first bent rebar family being shared by multiple projects. The "second bent rebar family" may also include families that cannot be shared by multiple projects.

[0103] "First bent reinforcing bar information 1" means one of the first bent reinforcing bar information included in the first bent reinforcing bar family. In other words, as shown in FIG. 11(a), the first bent reinforcing bar family includes first bent reinforcing bar information related to at least one bent reinforcing bar. In the example of FIG. 11(a), the first bent reinforcing bar family includes first bent reinforcing bar information 1 to first bent reinforcing bar information 3. The number of types of first bent reinforcing bar information may be two or less, or may be four or more.

[0104] The second curved reinforcing bar family also includes second curved reinforcing bar information relating to at least one curved reinforcing bar. In the example of Fig. 11(a), the second curved reinforcing bar family includes second curved reinforcing bar information 1 to second curved reinforcing bar information 3. The number of types of second curved reinforcing bar information may be two or less, or may be four or more.

[0105] For the first bending rebar information (first bending rebar information 1 to first bending rebar information 3 in the example of Figure 11(a)), the center dimension of the bent part of the bending rebar can be set within a range constrained by a formula based on the rebar diameter.

[0106] "Center dimension of the bent part" is the center dimension (such as the length of center line Cc or the length of center line Ce in Figure 8(b)) of the bent part of the bent rebar (such as part c or part e in Figure 7(a)). "Formula based on rebar diameter" is a formula with the rebar diameter as a parameter (such as "(length of bent part) = 1.5 x π (pi) x (rebar diameter)" in formula (1)). "Can be set within a range restricted by a formula" means that it is restricted to a range that can be determined by substituting arbitrary values ​​for the parameters of various formulas (such as rebar diameter).

[0107] For the second bending rebar information, the center dimension of the bending part of the bending rebar can be set arbitrarily. "The center dimension of the bending part can be set arbitrarily" means that the center dimension of the bending part can be defined by inputting any numerical value without being restricted by a predetermined formula (such as formula (1)). The value of "center dimension of the bending part" can be input directly.

[0108] Mathematical formulas (such as equation (1)) include at least pi (π) as a constant, and pi is used to at least two decimal places (up to 3.14).

[0109] For example, in a project related to the first bent reinforcing bar family, while the screen is displayed, it is possible to change the dimensions of the straight section (straight section) of the reinforcing bar (first bent reinforcing bar information) in the reinforcing bar installation drawing shown in FIG. 3(a) (or FIG. 3(b)) by dragging it with the mouse. Also, for example, it is possible to change the dimensions of the straight section (straight section) of the reinforcing bar object 42A shown in FIG. 6 by dragging it with the mouse or by entering values ​​for the straight section in the parameter table 42B. However, the length dimension of the bent section cannot be changed beyond the range constrained by the formula. The formula differs depending on the reinforcing bar diameter.

[0110] "Projects related to the first curved reinforcing bar family" are multiple projects that can share the first curved reinforcing bar family (in the example of Figure 11(a) , first curved reinforcing bar information 1 to first curved reinforcing bar information 3). "While displaying on the screen" means displaying on the display unit 35 (Figure 4) or the like so that the modeling contents can be visually confirmed. "Straight section" is the straight section of the reinforcing bar (such as parts a, b, and d in Figure 7(a)).

[0111] Regarding the dimensions of the straight section (straight portion), "can be changed arbitrarily" means that the dimension (length) of the "straight portion" can be stretched or contracted to any value without being constrained by a formula (such as formula (1)). "Length dimension of the bent portion" means the length dimension expressed by the center dimension of the bent portion. "The length dimension of the bent portion cannot be changed from the range constrained by the formula" means that, regarding the project portion related to the first bent rebar family, the length of the straight portion can be changed arbitrarily, but the length dimension of the bent portion is constrained by a formula.

[0112] <Advantages of the invention according to this embodiment> According to the construction support system 10 of this embodiment as described above, information on reinforcing bar objects (here, reinforcing bar manufacturing information, outer surface dimension information, etc.) created by the BIM program in the data supply unit 12 is used in the construction unit 14 and processing unit 16. Furthermore, the information on reinforcing bar objects is adjusted to the values ​​and units required by the data supply unit 12, the construction unit 14, and the processing unit 16 before being supplied.

[0113] The dimensions of the bent portion can be expressed by the center dimension in the data supply unit 12 (Fig. 1). The length of the reinforcing bar is expressed as a numerical value including the center dimension of the bent portion. Therefore, information on the length of the reinforcing bar is accurately expressed, and accurate information on the length of the reinforcing bar can be provided to the construction unit 14. Therefore, accurate information based on the center dimension can be provided.

[0114] Furthermore, the data supply unit 12 can provide the construction unit 14 with information regarding the length of the rebar, both expressed in terms of center dimensions and outer surface dimensions. This eliminates the need for the construction unit 14 and processing unit 16 to manually convert information acquired from upstream into the required information. This also enables consistent data exchange without human error from the design to manufacturing of the rebar.

[0115] Furthermore, the information on the rebar object created by the data supply unit 12 includes information on the length of the bent portion calculated in millimeters. Therefore, various simulations can be performed accurately based on accurate information on the length of the rebar. For example, it becomes possible to accurately check for interference between rebars in rebar installation drawings (e.g., Figures 3(a) and (b)) and perform various estimates related to the rebar. Accurate estimates can be performed by the data supply unit 12. Furthermore, by providing accurate information on the length of the rebar from the data supply unit 12 to the construction unit 14, the construction unit 14 can also perform accurate estimates. Therefore, the construction unit 14 does not need to place an order that may include excessive surplus material in the processing unit 16, which enables cost reduction.

[0116] Furthermore, as shown in FIGS. 11(a) to 11(c), different types of rebar objects can be created depending on the tolerance for change, making it possible to create 3D models using a variety of methods.

[0117] For these reasons, according to the invention relating to the construction support method, construction support program, and construction support device 30 of this embodiment, it is possible to develop the digital twin concept, which reproduces real space in virtual space (digital space), into something that is more useful and practical.

[0118] It should be noted that the above-described embodiment is merely an example of a specific implementation of the present invention, and the technical scope of the present invention should not be construed as being limited thereby. In other words, the present invention can be implemented in various forms without departing from the gist or main features thereof.

[0119] For example, in the example of Figure 1, various information (information such as processing books and two-dimensional codes) is provided from the data supply unit 12 to the processing unit 16 via the construction unit 14, but various information may also be provided from the data supply unit 12 to the processing unit 16 without going through the construction unit 14. [Explanation of symbols]

[0120] 10: Construction support system 12: Data supply unit 14: Construction department 16: Processing section 17: Rebar processing machine 22: 3D model 24: Reinforcement diagram 26: Summary table 30: Construction support equipment 31: Control unit 32: Storage section 33: Communications Department 34:Operation unit 35:Display section 36: 3D model creation section 37: Reinforcement drawing section 38: Summary table creation department 39: Reinforcement information calculation unit 40: 2D code creation section 42A, 46, F2, C-1, 46A: Rebar objects 47: External surface 48: Inner C, Ca~Ce: Center line

Claims

[Claim 1] A method for supporting the construction of buildings using three-dimensional modeling of bending reinforcing bars, comprising: As parameters relating to the three-dimensional model of the bent reinforcing bar, center dimension information of the bent reinforcing bar in millimeters and outer surface dimension information in units larger than the millimeters are used, a three-dimensional model information creating step of creating three-dimensional model information relating to the three-dimensional model; A reinforcing bar production information creation process for creating reinforcing bar production information based on the three-dimensional model information, At least in the three-dimensional model information creating step, the three-dimensional model information is created including the center dimension information, The length of the bent rebar in the center dimension information is the sum of the length of the bent portion and the length of the straight portion, A construction support method in which the length of the bent portion is calculated based on a classification related to the shape of the reinforcing bar and a diameter of the reinforcing bar.

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