Construction support device, construction support method, and construction support computer program

Abstract

To provide a construction support device, a construction support method, and a computer program for construction support that support construction of a steel bridge so as to reduce construction costs.SOLUTION: In a construction support system in which a server and a computer are communicably connected via a communication network, a processor 33 of the computer, which is a construction support device, includes a creation unit 331 and a change unit 333. The creation unit 331 creates a combination of attributes including a steel type, a length, a width, and a plate thickness of each of a plurality of steel materials used for construction of a steel bridge so as to satisfy constraint conditions including the effect that strength of the steel bridge is greater than a predetermined strength threshold. In order to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials, the change unit 333 changes the attribute of each of the plurality of steel materials included in the created combination.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present disclosure relates to a construction support device, a construction support method, and a construction support computer program for supporting the construction of a steel bridge. [Background technology]

[0002] Steel bridges are constructed by setting attributes such as thickness, width, and length of the multiple steel materials used in the construction of the steel bridge so that they meet specified requirements, ordering steel materials with the set attributes, and carrying out manufacturing work using the delivered steel materials.

[0003] Patent Document 1 describes a structural design system that performs an analysis using analytical model data in which the cross-sectional shape of each member is provisionally set for model data of a structure, and selects members that satisfy strength conditions. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2010-152857 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the structural design system described in Patent Document 1, the cross-sectional shape of each member is reduced until the strength of the member satisfies the strength condition, thereby minimizing the weight of the structure while using members that satisfy the strength condition. However, the structural design system described in Patent Document 1 does not take into consideration costs, including material costs and manufacturing costs. Also, in the structural design system described in Patent Document 1, model data of the structure is created based on information input by the designer. Therefore, in the structural design system described in Patent Document 1, the cost of the structure is easily affected by the skill of the designer who inputs the information.

[0006] Therefore, an object of the present disclosure is to provide a construction support device that supports the construction of a steel bridge so as to reduce construction costs. [Means for solving the problem]

[0007] The construction support device disclosed herein includes a creation unit that creates combinations of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy constraints including the strength of the steel bridge being greater than a predetermined strength threshold, and a modification unit that modifies the attributes of each of the multiple steel materials included in the created combination so as to satisfy the constraints and reduce construction costs including the material costs of the multiple steel materials and the manufacturing costs of the steel bridge using the multiple steel materials.

[0008] In the construction support device of the present disclosure, it is preferable that the attributes further include at least one of the amount of additives in each steel type of the plurality of steel materials and the manufacturing process for manufacturing each steel type of the plurality of steel materials, and the creation unit creates a combination so that the strength of the steel bridge that varies depending on the amount of the additive or the manufacturing process satisfies the constraint condition, and the modification unit modifies the attributes so that the construction cost calculated depending on the amount of the additive or the manufacturing process is reduced.

[0009] In the construction support device according to the present disclosure, it is preferable that the change unit calculates the construction cost so that the smaller the number of different thicknesses of the multiple steel materials included in the combination, the greater the discount.

[0010] In the construction support device according to the present disclosure, it is preferable that the change unit calculates the construction cost so that the greater the discount, the greater the total weight of the multiple steel materials included in the combination per type of plate thickness of the multiple steel materials included in the combination.

[0011] In the construction support device according to the present disclosure, it is preferable that the change unit calculates the construction cost so that the greater the discount, the greater the total area of ​​the multiple steel materials included in the combination per type of plate thickness of the multiple steel materials included in the combination.

[0012] In the construction support device according to the present disclosure, it is preferable for the modification unit to calculate a production cost for connecting pairs of steel materials having different plate thicknesses among the multiple steel materials included in the combination that is greater than the production cost for connecting pairs of steel materials having the same plate thickness among the multiple steel materials included in the combination.

[0013] In the construction support device disclosed herein, it is preferable that the device further includes a schedule adjustment unit that creates a production schedule for the steel bridge according to the respective delivery dates of the multiple steel materials, and the modification unit modifies the attributes so as to reduce construction costs, including production costs that vary according to the created production schedule.

[0014] The construction support method disclosed herein includes creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy constraints including the strength of the steel bridge being greater than a predetermined strength threshold, and changing the attributes of each of the multiple steel materials included in the created combination so as to satisfy the constraints and reduce construction costs including the material costs of the multiple steel materials and the manufacturing costs of the steel bridge using the multiple steel materials.

[0015] The construction support computer program disclosed herein causes a processor to create combinations of attributes, including the steel type, length, width, and plate thickness of each of the multiple steel materials used in the construction of a steel bridge, so as to satisfy constraints including the strength of the steel bridge being greater than a predetermined strength threshold, and to change the attributes of each of the multiple steel materials included in the created combination so as to satisfy the constraints and reduce construction costs, including the material costs of the multiple steel materials and the manufacturing costs of the steel bridge using the multiple steel materials. Effect of the Invention

[0016] The construction support device according to the present disclosure can support the construction of a steel bridge so as to reduce construction costs. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a schematic diagram showing a schematic configuration of a construction support system. [Diagram 2] FIG. 1 is a schematic diagram showing a schematic configuration of a computer. [Diagram 3] FIG. 2 is a functional block diagram of a processor included in the computer. [Figure 4] (a) is a schematic diagram showing the side of the girder supporting the bridge deck, (b) is a schematic diagram showing the top surface of the girder, and (c) is a schematic diagram showing the AA cross section of the girder. [Diagram 5] 1 is a process flowchart of a construction support method. [Figure 6] 1 is a graph showing material costs in each case of the examples. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, a construction support device capable of supporting the construction of a steel bridge so as to reduce construction costs will be described in detail with reference to the drawings. However, it should be understood that the present invention is not limited to the drawings or the embodiments described below.

[0019] The construction support device creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy constraint conditions including that the strength of the steel bridge is greater than a predetermined strength threshold value. The construction support device changes the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce the construction cost including the material cost of the plurality of steel materials and the construction cost of the steel bridge using the plurality of steel materials.

[0020] FIG. 1 is a schematic diagram showing a schematic configuration of a construction support system 1. As shown in FIG.

[0021] The construction support system 1 includes a server 2 and a computer 3. The server 2 is an information processing device that manages the supply status of steel materials. The computer 3 is an example of a construction support device. The server 2 and the computer 3 are communicatively connected via a communication network 4. The computer 3 obtains information from the server 2 as necessary and executes construction support processing.

[0022] FIG. 2 is a schematic diagram showing a schematic configuration of a computer.

[0023] The computer 3, which is an example of a construction support device, includes an input / output interface 31, a memory 32, and a processor 33.

[0024] The input / output interface 31 has an interface circuit for receiving data to be processed by the computer 3 or outputting data processed by the computer 3. The input / output interface 31 includes, for example, a communication interface circuit for connecting the computer 3 to the communication network 4, or a peripheral device interface circuit for connecting the computer 3 to various peripheral devices such as a keyboard, a mouse, and a display. The input / output interface 31 receives operation input from a terminal device via the communication interface circuit, or from an input device such as a keyboard or a mouse via the peripheral device interface circuit. The input / output interface 31 also outputs display data for displaying the changed attributes of the steel material to the terminal device via the communication interface circuit, or to the display via the peripheral device interface circuit.

[0025] The memory 32 has, for example, at least one of a semiconductor memory, a magnetic disk device, and an optical disk device. The memory 32 stores computer programs, data, and the like used for processing by the processor 33. The computer programs include a driver program, an operating system program, and a construction support computer program. The computer programs may be provided in a form recorded on a computer-readable portable recording medium such as a semiconductor memory, a magnetic recording medium, or an optical recording medium. The data includes constraint conditions that the steel bridge to be constructed should satisfy. The constraint conditions include a strength threshold that the strength of the steel bridge to be constructed should exceed.

[0026] The processor 33 includes one or more processors and their peripheral circuits. The processor 33 is a processing circuit that comprehensively controls the overall operation of the computer 3, and is, for example, a CPU (Central Processing Unit). The processor 33 controls the operation of the input / output interface 31, etc., so that various processes of the computer 3 are executed by appropriate means based on the programs, etc. stored in the memory 32. The processor 33 executes processes based on the various programs stored in the memory 32. The processor 33 can also execute a plurality of various programs in parallel.

[0027] 3 is a functional block diagram of the processor 33 of the computer 3. The processor 33 has a creation unit 331, a schedule adjustment unit 332, and a change unit 333. Each of these units of the processor 33 is a functional module implemented by a program executed on the processor of the processor 33. Alternatively, each of these units of the processor 33 may be implemented in the computer 3 as an independent integrated circuit, microprocessor, or firmware.

[0028] The creation unit 331 creates a combination of attributes of each of a plurality of steel materials used in the construction of a steel bridge. The attributes of the steel material include the steel type, length, width, and plate thickness of the steel material.

[0029] Fig. 4(a) is a schematic diagram showing the side of the girder supporting the bridge deck, Fig. 4(b) is a schematic diagram showing the top surface of the girder, and Fig. 4(c) is a schematic diagram showing the side of the girder supporting the bridge deck. teeth FIG. 2 is a schematic diagram showing the AA cross section of the girder.

[0030] The steel bridge SB has a girder G and a deck FS. The girder G is installed between the abutment AB1 and the abutment AB2, and supports the deck FS. The girder G is connected to the abutment AB1 via a support SH11, and to the abutment AB2 via a support SH12. G is the length of the digit G, and W G is the distance between the center of thickness of the web of the leftmost block B42 and the center of thickness of the web of the rightmost block B12.

[0031] The girder G has four main girders. Each main girder is made up of multiple blocks of one or more plate materials connected by joints. For example, the length L B11 Block B11 and length L B12 Block B12 is connected to block B12 by joint J11, and block B12 is connected to block B12 by joint J11. B13 It is connected to block B13 by joint J12 and has a length of L G The main girders are constructed.

[0032] The main girders of girder G are connected to each other by cross girders arranged in the width direction. For example, the main girder in which blocks B12 and B13 are connected in the longitudinal direction of the bridge by joint J12 is connected to the main girder in which blocks B22 and B23 are connected in the longitudinal direction of the bridge by joint J22 by cross girders CB14, CB15, CB16, and CB17. Similarly, the main girder in which blocks B22 and B23 are connected by joint J22 is connected to the main girder in which blocks B32 and B33 are connected by joint J32 by cross girders CB25, etc. Similarly, the main girder in which blocks B32 and B33 are connected by joint J32 is connected to the main girder in which blocks B42 and B43 are connected by joint J42 by cross girders CB35, etc. Each cross girder has a length d in the longitudinal direction of the bridge. L The electrodes are spaced apart from each other.

[0033] The plate thickness of each of the n plate elements constituting the block B42 is T B421 , T B422 , …, T B42n The plate thickness of each of the plate elements constituting the block B43 connected to the block B42 may be the same as or different from the plate thickness of each of the plate elements constituting the block B42.

[0034] The web width of block B12 is W B12W The width of the webs of blocks B22, B32, B42, which are arranged parallel to block B12 along the longitudinal direction of the bridge, is W B12W It may be the same as or different from.

[0035] The creation unit 331 creates a plurality of candidates representing combinations of steel materials used in the manufacture of the steel bridge SB, as follows: {(L B11 , W B11W , T B111 ), (L B11 , W B11W , T B112 It is created by defining variables that represent the size of each steel material, such as {size_of_steel_material, ...}.

[0036] The creation unit 331 creates a combination so that a steel bridge constructed using a plurality of steel materials included in the combination satisfies the constraint conditions stored in the memory 32. The constraint conditions include that the strength of the steel bridge is greater than a predetermined strength threshold. The constraint conditions may be existing design standards such as the Highway Bridge Specifications, AASHTO LFRD Bridge Design Specification, and Euro Code. The creation unit 331 can create a combination so as to satisfy the constraint conditions by excluding combinations that do not satisfy the constraint conditions from the created combinations.

[0037] The creation unit 331 inputs the attributes of each of the multiple steel materials included in the combination into an existing computer program for bridge analysis, thereby obtaining indexes determined by constraints such as the strength of the steel bridge.

[0038] The creation unit 331 may create a combination of attributes that further includes the amount of additives in each of the steel grades of the multiple steel products, or a manufacturing process for manufacturing each of the steel grades of the multiple steel products.

[0039] By adding additives to the steel grade or changing the manufacturing process, the weldability, toughness, and lamellar tear resistance of the steel can be changed. The creation unit 331 acquires information indicating additives that can be added to the steel grade and manufacturing processes that can be used to manufacture the steel grade from the server 2 via the input / output interface 31 and the communication network 4. The creation unit 331 acquires indices determined by constraint conditions by inputting the amount of additives included in the attributes and the properties of the steel determined by the manufacturing process into an existing computer program for bridge analysis. The creation unit 331 may acquire from the server 2 the amount of additives included in the attributes and the indices corresponding to the steel determined by the manufacturing process.

[0040] The schedule adjustment unit 332 creates a steel bridge production schedule according to the delivery date of each of the multiple steel materials. The schedule adjustment unit 332 obtains the delivery date of each of the multiple steel materials from the server 2 via the input / output interface 31 and the communication network 4. The schedule adjustment unit 332 creates a production schedule such that the start date of a process in which each of the multiple steel materials is used in the steel bridge production schedule consisting of multiple processes does not occur before the delivery date of the steel material.

[0041] The modification unit 333 modifies the attributes of each of the multiple steel materials included in the created combination so as to satisfy the constraint conditions and reduce the construction cost, including the material cost of the multiple steel materials and the manufacturing cost of the steel bridge using the multiple steel materials. Then, the modification unit 333 outputs the modified attributes of each of the multiple steel materials via the input / output interface 31.

[0042] The change unit 333 calculates the construction cost corresponding to the combination by using an evaluation function for calculating the construction cost with the attributes of the multiple steel materials included in the combination as variables. The change unit 333 then changes the attributes of each of the multiple steel materials by using a known optimization algorithm such as a differential evolution method or a genetic algorithm.

[0043] When the attributes of the steel material include the amount of additives included in the attributes of each steel type of a plurality of steel materials and the manufacturing process, the change unit 333 calculates the material cost calculated according to the amount of additives included in the attributes and the manufacturing process. The change unit 333 may transmit information on the amount of additives included in the attributes and the manufacturing process to the server 2 and obtain information on the corresponding material cost from the server 2.

[0044] The evaluation function for calculating the construction cost is set so that the fewer the number of types of plate thicknesses of the multiple steel materials included in the combination, the greater the discount. This corresponds to the fact that the fewer the number of types of plate thicknesses, the more the costs for manufacturing, transporting, and managing the steel plates can be reduced. Therefore, the modification unit 333 calculates the construction cost so that the fewer the number of types of plate thicknesses of the multiple steel materials included in the combination, the greater the discount, and modifies the attributes so that the calculated construction cost becomes smaller.

[0045] The evaluation function for calculating the construction cost is set so that the greater the total weight of the multiple steel materials included in the combination per type of plate thickness of the multiple steel materials included in the combination, the greater the discount. This corresponds to the fact that the greater the weight of the steel materials per type of plate thickness, the greater the cost of manufacturing, transporting, and managing the steel materials can be reduced. Therefore, the modification unit 333 calculates the construction cost so that the greater the total weight of the multiple steel materials included in the combination per type of plate thickness of the multiple steel materials included in the combination, the greater the discount, and modifies the attributes so that the calculated construction cost becomes smaller.

[0046] The evaluation function for calculating the construction cost is set so that the greater the total area of ​​the multiple steel materials included in the combination per type of plate thickness of the multiple steel materials included in the combination, the greater the discount. This corresponds to the fact that the greater the area of ​​the steel materials per type of plate thickness, the greater the degree of freedom in component layout when cutting steel materials from steel plates, and the greater the reduction in production costs. Therefore, the modification unit 333 calculates the construction cost so that the greater the total area of ​​the multiple steel materials included in the combination per type of plate thickness of the multiple steel materials included in the combination, the greater the discount, and modifies the attributes so that the calculated construction cost becomes smaller.

[0047] The evaluation function for calculating the construction cost is set so that the production cost for connecting a pair of steel materials with different plate thicknesses among the multiple steel materials included in the combination is greater than the production cost for connecting a pair of steel materials with the same plate thickness among the multiple steel materials included in the combination. This corresponds to the fact that the production cost can be reduced if the plate thicknesses of the steel materials to be connected are uniform at the connection part connecting the pair of steel materials. Therefore, the change unit 333 calculates the construction cost so that the production cost for connecting a pair of steel materials with different plate thicknesses among the multiple steel materials included in the combination is greater than the production cost for connecting a pair of steel materials with the same plate thickness among the multiple steel materials included in the combination, and changes the attributes so that the calculated construction cost is smaller.

[0048] The evaluation function for calculating the construction cost is set to calculate the production cost based on the production schedule created according to the delivery date of each of a plurality of steel materials. For example, if the start date of the construction period using a certain steel material is delayed due to the delivery date of the steel material, the production cost is calculated to be higher than when there is no delay. Therefore, the change unit 333 changes the attribute so that the construction cost including the production cost that varies according to the production schedule is reduced.

[0049] FIG. 5 is a process flowchart of the construction support method.

[0050] The processor 33 of the computer 3 executes the process shown in FIG. 5 every time a user operation for requesting support for the construction of a steel bridge is received via the input / output interface 31.

[0051] First, the creation unit 331 of the processor 33 creates a combination of attributes including the steel type, length, width, and plate thickness of each of the multiple steel materials used in the construction of the steel bridge so as to satisfy constraints including that the strength of the steel bridge be greater than a predetermined strength threshold (step S1).

[0052] Next, the schedule adjustment unit 332 of the processor 33 creates a production schedule for the steel bridge in accordance with the delivery dates of each of the multiple steel materials (step S2).

[0053] Next, the change unit 333 of the processor 33 changes the attributes of each of the multiple steel materials included in the created combination so as to satisfy the constraint conditions and reduce the construction cost including the material cost and the manufacturing cost (step S3). Then, the change unit 333 outputs the changed attributes of each of the multiple steel materials via the input / output interface 31, and ends the construction support process.

[0054] By executing the construction support process in this manner, the computer 3 can support the construction of a steel bridge in a shorter time and at a lower construction cost than manual design, regardless of the user's design skill. In addition, after calculating design proposals for multiple bridge types and their construction costs using this construction support process, a final design proposal may be selected from the multiple design proposals, taking into account evaluation indices other than construction cost, such as appearance.

[0055] According to a modified example, the computer 3 does not have to be communicatively connected to the server 2 via the communication network 4. In this case, the computer 3 creates a production schedule using the delivery date information stored in the memory 32, and changes the attributes of the steel materials so as to reduce the construction cost calculated based on the created production schedule.

[0056] An embodiment of the present disclosure using a computer 3 is shown below. In this embodiment, the length L of the digit G is calculated using the computer 3. G The material cost out of the construction cost was minimized for each of the three cases shown in Table 1 below, in which the degree of freedom of the attributes of the steel materials used in the construction of a steel bridge with a bridge length of 160 m, four girders, a girder spacing of 2.44 m, nine blocks per girder, three supports in the girder longitudinal direction for each girder, and a support spacing of 80 m was changed. In this example, the change unit 333 of the computer 3 used differential evolution as an optimization algorithm for changing the attributes of each of the multiple steel materials so as to minimize the material cost.

[0057] [Table 1]

[0058] In case 1, the yield strength is 400 N / mm 2 This is because only steel with a strength of 400 N / mm is used, which is cheaper in material cost compared to higher strength steels. 2 In Case 1, computer 3 varied the thickness of the steel used in 1 mm increments and found the design result that minimized the weight of the steel used.

[0059] In case 2, the yield strength is 400 N / mm 2 Steel with a yield strength of 500 N / mm 2 and a yield strength of 700 N / mm 2 Computer 3 selected the steel material to be used from three types of steel with different strengths, and varied the steel plate thickness in 1mm increments to obtain a design result that minimized the weight of steel used.

[0060] In case 3, the yield strength is 400 N / mm 2 Steel with a yield strength of 500 N / mm 2 and a yield strength of 700 N / mm 2The steel material to be used is selected from the steel materials listed above. Computer 3 selects the steel material to be used from three types of steel with different strengths, and changes the thickness of the steel material in 5mm increments to obtain a design result that minimizes the weight of the steel material used. In Case 3, the change in thickness of the steel material is large, so the degree of freedom in thickness selection is small, and a reduction in the number of thickness types is expected.

[0061] For each plate thickness in the design results for each case, the weight of the steel material used for that plate thickness was multiplied by the material cost coefficient (price ratio to a general thick steel plate of the same weight) shown in Table 2, and the sum of these was determined as the material cost in this example. By multiplying this material cost by the price per unit weight of a general thick steel plate at that time, the material cost can be converted into the amount at that time.

[0062] [Table 2]

[0063] The fewer the number of thickness types, the more the costs of manufacturing, transporting, and managing the steel plates can be reduced. In this embodiment, the material cost calculated from the design results is deducted by (10-number of thickness types used)% (but not less than 0%).

[0064] FIG. 6 is a diagram showing material costs in each case of the examples.

[0065] The material cost of the design results obtained by computer 3 for case 2 was reduced by approximately 19% compared to the material cost of the design results obtained for case 1. Note that the number of plate thickness types in the design results obtained for cases 1 and 2 was 14 and 11, respectively, so no discount was applied in either case.

[0066] There was no significant difference between the undiscounted material cost of the design result obtained for Case 3 by computer 3 and the material cost of the design result obtained for Case 2. Since the number of plate thickness types in the design result obtained for Case 3 was 8, a 2% discount was applied. As a result, the material cost of the design result obtained for Case 3 was reduced by 2% compared to the material cost of the design result obtained for Case 2.

[0067] In this way, the computer 3 was able to assist in the construction of a steel bridge in a shorter time and at a lower construction cost than would be possible if the design were done manually, regardless of the user's design skill.

[0068] It should be understood that those skilled in the art can make various changes, substitutions, and alterations thereto without departing from the spirit and scope of the present disclosure. [Explanation of symbols]

[0069] 3. Computer 331 Creation Department 332 Scheduling Department 333 Changes

Claims

1. A creation unit that creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold value; A modification unit that modifies the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; Equipped with The attributes further include a manufacturing process for manufacturing each of the steel grades of the plurality of steel products; the creation unit creates the combination so that the strength of the steel bridge, which varies depending on the manufacturing process, satisfies the constraint condition; the modification unit modifies the attributes so as to reduce the construction cost calculated according to the manufacturing process. Construction support equipment.

2. A creation unit that creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold value; A modification unit that modifies the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; Equipped with The change unit calculates the construction cost so that the smaller the number of types of plate thicknesses of the multiple steel materials included in the combination, the greater the discount. Construction support equipment.

3. A creation unit that creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold value; A modification unit that modifies the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; Equipped with The change unit calculates the construction cost so that the greater the total weight of the plurality of steel materials included in the combination per type of plate thickness of the plurality of steel materials included in the combination, the greater the discount. Construction support equipment.

4. A creation unit that creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold value; A modification unit that modifies the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; Equipped with The change unit calculates the construction cost so that the greater the discount, the greater the total area of ​​the plurality of steel materials included in the combination per type of plate thickness of the plurality of steel materials included in the combination. Construction support equipment.

5. A creation unit that creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold value; A modification unit that modifies the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; Equipped with The change unit calculates the production cost for connecting a pair of steel materials having different plate thicknesses among the plurality of steel materials included in the combination to be greater than the production cost for connecting a pair of steel materials having the same plate thickness among the plurality of steel materials included in the combination. Construction support equipment.

6. A creation unit that creates a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold value; A modification unit that modifies the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; A schedule adjustment unit that creates a production schedule for the steel bridge according to the delivery dates of each of the plurality of steel materials; Equipped with The modification unit modifies the attributes so as to reduce the construction cost that varies depending on the created production schedule. Construction support equipment.

7. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; and changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; The attributes further include a manufacturing process for manufacturing each of the steel grades of the plurality of steel products; In the creation, the combination is created so that the strength of the steel bridge, which varies depending on the manufacturing process, satisfies the constraint condition; In the modification, the attribute is modified so that the construction cost calculated according to the manufacturing process is reduced. Construction support methods.

8. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; and changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; In the change, the construction cost is calculated so that the smaller the number of types of plate thicknesses of the multiple steel materials included in the combination, the greater the discount. Construction support methods.

9. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; and changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; In the change, the construction cost is calculated so that the greater the total weight of the plurality of steel materials included in the combination per type of plate thickness of the plurality of steel materials included in the combination, the greater the discount. Construction support methods.

10. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; and changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; In the change, the construction cost is calculated so that the greater the total area of ​​the plurality of steel materials included in the combination per type of plate thickness of the plurality of steel materials included in the combination is, the greater the discount. Construction support methods.

11. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; and changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; In the change, the production cost for connecting a pair of steel materials having different plate thicknesses among the plurality of steel materials included in the combination is calculated to be larger than the production cost for connecting a pair of steel materials having the same plate thickness among the plurality of steel materials included in the combination. Construction support methods.

12. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Modifying the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; creating a production schedule for the steel bridge according to delivery dates for each of the plurality of steel materials; In the modification, the attribute is modified so that the construction cost that varies depending on the created production schedule is reduced. Construction support methods.

13. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of the steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; A construction support computer program for causing a processor to execute the following: The attributes further include a manufacturing process for manufacturing each of the steel grades of the plurality of steel products; In the creation, the combination is created so that the strength of the steel bridge, which varies depending on the manufacturing process, satisfies the constraint condition; In the modification, the attribute is modified so that the construction cost calculated according to the manufacturing process is reduced. A computer program for construction support.

14. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; A construction support computer program for causing a processor to execute the following: In the change, the construction cost is calculated so that the smaller the number of types of plate thicknesses of the plurality of steel materials included in the combination, the larger the discount. A computer program for construction support.

15. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; A construction support computer program for causing a processor to execute the following: In the change, the construction cost is calculated so that the greater the total weight of the plurality of steel materials included in the combination per type of plate thickness of the plurality of steel materials included in the combination is, the greater the discount. A computer program for construction support.

16. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; A construction support computer program for causing a processor to execute the following: In the change, the construction cost is calculated so that the greater the discount, the greater the total area of ​​the plurality of steel materials included in the combination per type of plate thickness of the plurality of steel materials included in the combination. A computer program for construction support.

17. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; A construction support computer program for causing a processor to execute the following: In the change, the production cost for connecting a pair of steel materials having different plate thicknesses among the plurality of steel materials included in the combination is calculated to be larger than the production cost for connecting a pair of steel materials having the same plate thickness among the plurality of steel materials included in the combination. A computer program for construction support.

18. Creating a combination of attributes including the steel type, length, width, and plate thickness of each of a plurality of steel materials used in the construction of a steel bridge so as to satisfy a constraint condition including that the strength of the steel bridge is greater than a predetermined strength threshold; Changing the attributes of each of the plurality of steel materials included in the created combination so as to satisfy the constraint conditions and reduce construction costs including material costs of the plurality of steel materials and manufacturing costs of the steel bridge using the plurality of steel materials; Creating a production schedule for the steel bridge according to delivery dates for each of the plurality of steel materials; A construction support computer program for causing a processor to execute the following: In the modification, the attribute is modified so that the construction cost that varies depending on the created production schedule is reduced. A computer program for construction support.

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