Carbon dioxide emission calculation system, carbon dioxide emission calculation method, and program

Abstract

To provide a carbon dioxide emission calculation system that makes it easier to calculate CO2 emissions in the civil engineering field than before. [Solution] A carbon dioxide emission calculation system comprising: a cost estimate acquisition unit that acquires cost estimates for civil engineering works; an item estimation unit that estimates the item corresponding to the item in the cost estimate acquired by the cost estimate acquisition unit from among a plurality of predetermined items of carbon dioxide emission intensity; and an emission calculation unit that calculates the carbon dioxide emissions of civil engineering works using at least the carbon dioxide emission intensity of the item estimated by the item estimation unit and the quantity of the item in the cost estimate acquired by the cost estimate acquisition unit.

Description

Technical Field

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[0001] The present invention relates to a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a program.

Background Art

[0002] In recent years, global warming caused by greenhouse gases such as carbon dioxide has become a problem. In the construction field, the "LCA Guidelines for Buildings" (Non-Patent Document 1) by the Architectural Institute of Japan and the "CO2 Emission Calculation Manual" (Non-Patent Document 2) by the Real Estate Association have been published. Based on these, applications for calculating CO2 emissions, such as Shimizu Corporation's "SCAT", Tokyu Construction's "Common Unit Database" and "Environmental Management System", Taisei Corporation's "T-CARBON Navios" and "T-Carbon BIM Simulator", and Obayashi Corporation's "CO2 Emission Prediction System Carbon Designer", have already been developed.

[0003] On the other hand, in the civil engineering field, although it has been lagging behind the construction field, in 2022, the Ministry of Land, Infrastructure, Transport and Tourism's Port and Harbour Bureau published the "Guidelines for Calculating Carbon Dioxide Emissions in Port Works" (Non-Patent Document 4) based on the research results of the Port and Airport Research Institute of the National Institute of Maritime, Port and Aviation Technology (Non-Patent Document 3). In addition, regarding the CO2 emission calculation guidelines for other civil engineering works other than port works, discussions are currently being carried out mainly by the National Institute of Land and Infrastructure, Transport and Technology. In the civil engineering field, based on the trends of these guidelines, the CO2 calculation work is at a stage where it will become widespread in the future.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

[0005] However, in the civil engineering field, there is a problem in that there is no application for calculating CO2 emissions, which can make the process of calculating CO2 emissions complicated.

[0006] This invention has been made in view of these circumstances, and provides a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a program that can calculate CO2 emissions in the civil engineering field more easily than before. [Means for solving the problem]

[0007] This invention was made to solve the above-mentioned problems, and one aspect of the present invention is a carbon dioxide emission calculation system comprising: an estimate acquisition unit that acquires an estimate for civil engineering work; an item estimation unit that estimates the item corresponding to the item in the estimate acquired by the estimate acquisition unit from among a plurality of predetermined items of carbon dioxide emission intensity; and an emission calculation unit that calculates the carbon dioxide emission for the civil engineering work using at least the carbon dioxide emission intensity of the item estimated by the item estimation unit and the quantity of the item in the estimate acquired by the estimate acquisition unit.

[0008] Another aspect of this invention is the carbon dioxide emission calculation system described above, wherein the item estimation unit estimates the items using a model generated by machine learning.

[0009] Another aspect of this invention is the carbon dioxide emission calculation system described above, wherein if the quantity units of the items in the cost estimate acquired by the cost estimate acquisition unit do not match the unit carbon dioxide emission values ​​of the items estimated by the item estimation unit, the emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using at least the amounts of the items in the cost estimate acquired by the cost estimate acquisition unit.

[0010] Another aspect of this invention is the carbon dioxide emission calculation system described above, wherein the emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using the amounts of the items in the cost estimate acquired by the cost estimate acquisition unit, further using the producer price for a specific year, the price ratio compared to a specific year, the ratio of producer price to purchase price, and the unit carbon dioxide emission intensity of the items estimated by the item estimation unit to calculate the carbon dioxide emissions of the civil engineering work.

[0011] Another aspect of this invention is the carbon dioxide emission calculation system described above, comprising a code storage unit that stores the correspondence between a management code for an item used in the calculation sheet and any of the plurality of items, wherein the item estimation unit uses the model to estimate the item if the item within the plurality of items corresponding to an item in the calculation sheet acquired by the calculation sheet acquisition unit cannot be obtained from the code storage unit.

[0012] Another aspect of this invention is the carbon dioxide emission calculation system described above, comprising a display unit that displays a plurality of carbon dioxide emission amounts calculated by the emission calculation unit based on a plurality of accumulation reports acquired by the accumulation report acquisition unit in a comparable manner.

[0013] Another aspect of this invention is the carbon dioxide emission calculation system described above, wherein the emission calculation unit calculates carbon dioxide emissions for each Scope in the GHG protocol based on the cumulative report acquired by the cumulative report acquisition unit.

[0014] Another aspect of this invention is a method for calculating carbon dioxide emissions, comprising: a first step of obtaining an estimate for civil engineering work; a second step of estimating the items from a plurality of predetermined items of carbon dioxide emission intensity that correspond to the items in the estimate obtained in the first step; and a third step of calculating the carbon dioxide emissions of the civil engineering work using at least the carbon dioxide emission intensity of the items estimated in the second step and the quantities of the items in the estimate obtained in the first step.

[0015] Another aspect of this invention is a program that causes a computer to function as a cost estimate acquisition unit for acquiring cost estimates for civil engineering works, an item estimation unit for estimating the items corresponding to the items in the cost estimate acquisition unit acquired by the cost estimate acquisition unit from among a plurality of predetermined items of carbon dioxide emission intensity, and an emission calculation unit for calculating the carbon dioxide emissions of the civil engineering works using at least the carbon dioxide emission intensity of the items estimated by the item estimation unit and the quantities of the items in the cost estimate acquisition unit acquired by the cost estimate acquisition unit.

Advantages of the Invention

[0016] According to this invention, a carbon dioxide emission calculation system, a carbon dioxide emission calculation method, and a program can calculate the CO2 emissions in the civil engineering field more easily than before.

Brief Description of the Drawings

[0017] [Figure 1] It is a schematic block diagram showing the device configuration of the carbon dioxide emission calculation system 10 according to an embodiment of this invention. [Figure 2] [[ID=1 >> It is a schematic block diagram showing the functional configuration of the carbon dioxide emission calculation system 10 in the same embodiment. [Figure 3] It is a table showing an example of the content of the accumulation statement in the same embodiment. [Figure 4] It is a table showing an example of the stored content of the code storage unit 44 in the same embodiment. [Figure 5] It is a table showing an example of the unit table stored in the unit storage unit 46 in the same embodiment. [Figure 6] It is a flowchart for explaining an operation example of the item estimation unit 42 in the same embodiment. [Figure 7] It is a flowchart for explaining an operation example of the emission calculation unit 43 in the same embodiment. [Figure 8] It is a table showing an example of the calculation method by the emission calculation unit 43 in the same embodiment. [Figure 9] It is a graph showing an example of the display of the user terminal 20 in the same embodiment.

Modes for Carrying Out the Invention

[0018] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic block diagram showing the device configuration of a carbon dioxide emission calculation system 10 according to one embodiment of the present invention. The carbon dioxide emission calculation system 10 calculates the carbon dioxide emissions in a civil engineering project based on the cost estimate for the civil engineering project. This cost estimate may be one prepared based on cost estimation guidelines and standards established by the national and local governments. The cost estimate may be generated using applications such as Gaia® Cloud (Being Inc.), MOOBIOUS for Cloud (Kibi System Co., Ltd.), or ATLUS NEXT (Computer System Laboratory Co., Ltd.). The carbon dioxide emission calculation system 10 includes a user terminal 20 that is connected to a network 30 such as the Internet for communication, and an emission calculation server 40. The carbon dioxide emission calculation system 10 may include multiple user terminals 20.

[0019] The user terminal 20 is a computer such as a personal computer, tablet, or smartphone, which runs a general-purpose web browser and accesses the emissions calculation server 40.

[0020] The emissions calculation server 40 calculates the carbon dioxide emissions for a civil engineering project based on the cost estimate uploaded from the user terminal 20. The emissions calculation server 40 may display the calculated carbon dioxide emissions in a graph, table, or other format on the user terminal 20, or it may allow the user terminal 20 to download an electronic file containing the calculated carbon dioxide emissions. The emissions calculation server 40 may be implemented by one or more computers loading and executing a program. Furthermore, the emissions calculation server 40 may be implemented on a so-called cloud.

[0021] Figure 2 is a schematic block diagram showing the functional configuration of the carbon dioxide emission calculation system 10 in this embodiment. The user terminal 20 includes a browser unit 21. The emission calculation server 40 includes a total statement acquisition unit 41, an item estimation unit 42, an emission calculation unit 43, a code storage unit 44, a model storage unit 45, a unit consumption storage unit 46, and a price storage unit 47. Note that some or all of the total statement acquisition unit 41, item estimation unit 42, emission calculation unit 43, code storage unit 44, model storage unit 45, unit consumption storage unit 46, and price storage unit 47 may be included in the user terminal 20.

[0022] The browser unit 21 has the functionality of a web browser and provides a user interface to the user of the carbon dioxide emission calculation system 10 according to the files provided by the emission calculation server 40. For example, the browser unit 21 functions as a transmission unit that uploads civil engineering cost estimates to the emission calculation server 40, a display unit that displays the carbon dioxide emissions calculated by the emission calculation server 40, and a reception unit that downloads data according to user operations.

[0023] The cost estimate acquisition unit 41 acquires the cost estimate for civil engineering work from the user terminal 20. For example, the cost estimate acquisition unit 41 may acquire the cost estimate by sending a file containing a web page for uploading the cost estimate to the user terminal 20, thereby causing the user terminal 20 to upload the cost estimate. The cost estimate may be a tabular electronic file containing, in each item (1 record), information identifying items such as the name and management code of the materials and equipment, and information indicating the quantity of the materials and equipment. The information indicating the quantity may be an amount.

[0024] The item estimation unit 42 estimates the items that correspond to the items in the cost estimate acquired by the cost estimate acquisition unit 41, from among several predetermined items of carbon dioxide emission intensity. The item estimation unit 42 may use a model generated by machine learning to estimate the above items. The information used to identify the items in the cost estimate may include unique information such as abbreviations of materials and equipment used by the creator of the cost estimate (e.g., ready-mix concrete), and this machine learning learns the correspondence between this unique information and the items of the intensity. This machine learning may be a method similar to the random forest method or another method. Conventionally, when calculating carbon dioxide emissions from civil engineering works, workers had to manually compare the vast amount of information on materials and equipment used in civil engineering works with the items in the unit intensity table, which numbered from hundreds to thousands. This required a lot of effort and also included the possibility of human errors such as matching mistakes. However, by estimating the items in the unit intensity table using a model generated by machine learning in this way, productivity can be improved and human errors can be eliminated.

[0025] Furthermore, the item estimation unit 42 may estimate the items in the unit intensity table by using the management codes included in the cost estimates that the code storage unit 44 has pre-associated and stored, and the items in the carbon dioxide emission unit intensity table. When the item estimation unit 42 uses the correspondence between the management codes stored in the code storage unit 44 and the items in the unit intensity table, it may determine the application that generated the cost estimates from the format of the cost estimates, etc., and use the correspondence between the management codes and units corresponding to the application determined by the result of the determination. In addition, if the item estimation unit 42 cannot obtain from the code storage unit 44 the items in the unit intensity table that correspond to the items in the cost estimates acquired by the cost estimate acquisition unit 41, it may use a model generated by machine learning to estimate the items.

[0026] The emissions calculation unit 43 calculates the carbon dioxide emissions of the civil engineering work by using at least the carbon dioxide emission intensity (carbon dioxide emission intensity) of the items estimated by the item estimation unit 42 and the quantities of the items in the cost estimate acquired by the cost estimate acquisition unit 41. For example, the emissions calculation unit 43 calculates the carbon dioxide emissions of the civil engineering work by multiplying the carbon dioxide emission intensity of the items estimated by the item estimation unit 42 by the quantities of the items in the cost estimate acquired by the cost estimate acquisition unit 41. The emissions calculation unit 43 obtains the carbon dioxide emission intensity from the intensity table stored in the intensity storage unit 46.

[0027] If the quantity units of the items in the cost estimates acquired by the cost estimate acquisition unit 41 do not match the unit carbon dioxide emission intensity of the items estimated by the item estimation unit 42, the emission calculation unit 43 may calculate the carbon dioxide emissions of the civil engineering work by using at least the monetary amounts of the items in the cost estimates acquired by the cost estimate acquisition unit 41. Here, "units not matching" includes cases where the quantity unit of the items in the cost estimates is volume such as [m3] and the unit carbon dioxide emission intensity is weight such as [t], or where the quantity unit of the items in the cost estimates is only monetary. When calculating the carbon dioxide emissions of the civil engineering work using the monetary amounts of the items in the cost estimates acquired by the cost estimate acquisition unit 41, the emission calculation unit 43 may further use the producer price for a specific year, the price ratio compared to a specific year, the ratio of producer price to buyer price, and the unit carbon dioxide emission intensity of the items estimated by the item estimation unit 42 to calculate the carbon dioxide emissions of the civil engineering work. In that case, the emissions calculation unit 43 may calculate the carbon dioxide emissions by multiplying the unit cost obtained using the following formulas (1) and (2) by the amount of the item in the calculation sheet.

[0028]

number

[0029] Furthermore, "producer price" and "ratio of producer price to buyer price" may be the producer price listed in IDEA (Inventory Database for Environmental Analysis) created by the IDEA Lab of the Safety Science Research Division of the National Institute of Advanced Industrial Science and Technology (AIST), and the ratio of the producer price to the buyer price for the total domestic demand for each material. In addition, the price ratio for a specific year may be the value for "Civil Engineering Comprehensive" within the Construction Cost Deflator published by the Ministry of Land, Infrastructure, Transport and Tourism. For example, if IDEA ver3.2 is used for "producer price," since this price is based on the unit price in 2015, the price ratio for a specific year should be the price ratio for 2015.

[0030] The code storage unit 44 stores the correspondence between the management codes of items used in the cost estimate and the carbon dioxide emission intensity. The management codes may also be the unit price codes in the cost estimate. The code storage unit 44 may also store this correspondence for each application that created the cost estimate. The model storage unit 45 stores the model (a model generated by machine learning) that the item estimation unit 42 uses when estimating items.

[0031] The unit intensity storage unit 46 stores a table of carbon dioxide emission intensity. Examples of unit intensity tables include 3EID (National Institute for Environmental Studies, Center for Global Environmental Research: Environmental Load Intensity Data Book based on Input-Output Tables) and IDEA (National Institute of Advanced Industrial Science and Technology, Safety Science Research Division, IDEA Lab: LCI Database IDEA version 3). The price memory unit 47 stores the producer price for a specific year, the price ratio compared to that year, and the ratio of the producer price to the buyer price. Alternatively, the price memory unit 47 may store the "price-adjusted buyer price" calculated by formula (2). In that case, the emissions calculation unit 43 may use the "price-adjusted buyer price" stored in the price memory unit 47 and the unit price obtained using formula (1).

[0032] Figure 3 is a table showing an example of the contents of a cost estimate in this embodiment. In the example shown in Figure 3, the element breakdown, which is information indicating the items of the cost estimate, is associated with the quantity, unit, unit price, amount, and application. For example, in the element breakdown of the first item (first line) of the cost estimate in Figure 3, the unit price code is "C000190" and the item name is "Cement Ordinary Portland Bulk," the quantity is "2672.351," the unit is "m3," the unit price is "11500," and the amount is "30732034," but there is no application. The application may include the basis for the unit price, etc. When the item estimation unit 42 estimates the items of the unit cost table using a machine learning model, for the first item of the cost estimate in Figure 3, the item name "Cement Ordinary Portland Bulk" is used as input to the model to estimate the item.

[0033] Figure 4 is a table showing an example of the contents stored in the code storage unit 44 in this embodiment. In the example shown in Figure 4, the code storage unit 44 stores the unit price code, which is the management code for the cost estimate, in association with the unit price name, standard, unit, unit price, and unit cost code. Here, the unit cost code is information that indicates the item in the unit cost table. For example, the first row of the example contents in Figure 4 contains the unit price code "C000198", the unit price name "Cement", the standard "Blast Furnace B Bulk", the unit "kg", the unit price "13", and the unit cost code "SC_M_xx".

[0034] Figure 5 is a table showing an example of a unit consumption table stored by the unit consumption storage unit 46 in this embodiment. In the example shown in Figure 5, the unit consumption storage unit 46 stores the unit consumption code, the unit consumption name, and the carbon dioxide emission unit (kgCO2 / m3) for each item in the unit consumption table. For example, the first row of the example unit consumption table in Figure 5 contains the unit consumption code "SC_M_1", the unit consumption name "Ready-mixed concrete blast furnace", and the carbon dioxide emission unit "158".

[0035] Figure 6 is a flowchart illustrating an example of the operation of the item estimation unit 42 in this embodiment. First, the item estimation unit 42 reads an item from the cost estimate (step Sa1). Next, the item estimation unit 42 determines whether the management code described in the item from the cost estimate read in step Sa1 is present in the management codes stored in the code storage unit 44 (step Sa2). If it is determined that a management code exists (step Sa2-Yes), the item estimation unit 42 refers to the code storage unit 44 and estimates the item in the unit cost table corresponding to the management code (step Sa3). Next, the item estimation unit 42 determines whether all items in the cost estimate have been processed (step Sa4). If they have not been processed (step Sa4-No), the item estimation unit 42 returns to step Sa1, reads the next item, and continues processing. On the other hand, if they have been processed (step Sa4-Yes), the item estimation unit 42 terminates processing.

[0036] Furthermore, if it is determined in step Sa2 that there is no management code (step Sa2-No), the item estimation unit 42 obtains a model from the model storage unit 45 (step Sa5), uses the model to estimate the item in the unit cost table that corresponds to the item in the cost estimate (step Sa6), and proceeds to step Sa4.

[0037] Figure 7 is a flowchart illustrating an example of the operation of the emissions calculation unit 43 in this embodiment. First, the emissions calculation unit 43 reads an item from the total cost sheet (step Sb1). Next, for the item read in step Sb1, the emissions calculation unit 43 reads the unit cost of the item in the unit cost table estimated by the item estimation unit 42 from the unit cost storage unit 46 (step Sb2). For example, if the item estimation unit 42 estimates the unit cost code "SC_M_2" as an item in the unit cost table, the emissions calculation unit 43 reads the unit cost "257" associated with the unit cost code "SC_M_2" from the unit cost storage unit 46.

[0038] Next, the emissions calculation unit 43 determines whether the unit of quantity of the item read in step Sb1 matches the unit of intensity read in step Sb2 (step Sb3). If it determines that they match (step Sb3-Yes), the emissions calculation unit 43 calculates the carbon dioxide emissions using the quantity in the total statement (step Sb4). For example, if the unit of intensity read in step Sb2 is 257 kg CO2 / m3 and the quantity of the item read in step Sb1 is 3136 m3, the emissions calculation unit 43 multiplies the unit of intensity (257 kg CO2 / m3) by the quantity (3136 m3) to calculate the carbon dioxide emissions of 805,952 kg CO2. Next, the emissions calculation unit 43 determines whether all items in the total statement have been processed (step Sb5). If they have not been processed (step Sb5-No), the emissions calculation unit 43 returns to step Sb1, reads the next item, and continues processing. On the other hand, if the processing has already been completed (step Sb5-Yes), the emissions calculation unit 43 terminates the processing.

[0039] Furthermore, if it is determined in step Sb3 that there is no match (step Sb3-No), the emissions calculation unit 43 calculates the carbon dioxide emissions using the amount in the total amount sheet (step Sb6) and proceeds to step Sa4. In step Sb6, for example, if the unit consumption read in step Sb2 is 257 kg Co2 / m3 and the amount for one item read in step Sb1 is 67,110 yen, the emissions calculation unit 43 converts the unit consumption of 257 kg Co2 / m3 to XX kg Co2 / yen using formulas (1) and (2), and calculates the carbon dioxide emissions by multiplying the XX kg Co2 / yen by the amount of 67,110 yen.

[0040] Figure 8 is a table showing an example of the calculation method by the emissions calculation unit 43 in this embodiment. Figure 8 is a table showing carbon dioxide emission items and the method for calculating carbon dioxide emissions for said carbon dioxide emission items. If the items in the total amount statement correspond to the carbon dioxide emission items in Figure 8, the carbon dioxide emissions may be calculated using the calculation method described in the emissions calculation unit 43.

[0041] If an item in the calculation sheet corresponds to fuel use, the emissions calculation unit 43 aggregates carbon dioxide emissions during combustion (Scope 1) and during upstream production (extraction and refining) (Scope 3-3). To this end, the emissions calculation unit 43 calculates a value obtained by multiplying the amount of diesel fuel, gasoline, kerosene, and city gas used as listed in the calculation sheet by the carbon dioxide emission intensity during combustion, and a value obtained by multiplying the amount of fuel used by the carbon dioxide emission intensity during production.

[0042] If an item in the calculation sheet corresponds to electricity usage, the emissions calculation unit 43 calculates the carbon dioxide emissions during electricity usage (Scope 2) by multiplying the amount of electricity usage listed in the calculation sheet by the carbon dioxide emission intensity associated with electricity usage.

[0043] If an item in the cost estimate corresponds to material procurement, the emissions calculation unit 43 aggregates the carbon dioxide emissions at the time of raw material procurement (Scope 3-1). For each material listed in the cost estimate, the emissions calculation unit 43 aggregates the carbon dioxide emission intensity by multiplying the quantity of the material by the carbon dioxide emission intensity.

[0044] If the item in the cost estimate falls under construction machinery and temporary materials, the emissions calculation unit 43 aggregates the carbon dioxide emissions during the transportation of the construction machinery and temporary materials (Scope 3-4). The emissions calculation unit 43 calculates the transportation costs for the construction machinery and temporary materials listed in the cost estimate by multiplying the transportation cost by the carbon dioxide emission intensity.

[0045] When an item in the cost estimate falls under the category of materials, the cost of transporting the materials is included in the procurement cost in the cost estimate, making it difficult to infer the transport situation from the cost estimate. Therefore, the emissions calculation unit 43 refers to the raw material transport scenario used in the carbon footprint pilot project when the transport distance is unknown (for example, the Ministry of the Environment, the Ministry of Economy, Trade and Industry: Basic Guidelines on Calculating Greenhouse Gas Emissions Through the Supply Chain (ver. 2.4), 2022) and assumes the following: transport distance: 100km (scenario for transport that is certain to be confined within the prefecture), means of transport: 10-ton truck, load factor: 62% (scenario for transport that is only by land). The emissions calculation unit 43 adopts the carbon dioxide emission intensity closest to this and calculates the carbon dioxide emissions by multiplying the material weight obtained from the cost estimate by the transport distance (100km). Note that the operator may specify which scenario to assume.

[0046] If an item in the cost estimate falls under the category of waste, the emission calculation unit 43 aggregates the carbon dioxide emissions from the transportation and disposal (Scope 3-5) of waste such as concrete debris and wood scraps generated during construction. For disposal, the emission calculation unit 43 calculates the emissions by multiplying the amount of waste disposed of as recorded in the cost estimate by the carbon dioxide emission intensity for industrial waste treatment, incineration, landfill, etc. However, for concrete debris and asphalt debris, since more than 99% is recycled, it may be assumed that the carbon dioxide emissions at disposal are zero. For transportation, the emission calculation unit 43 refers to the method for materials shown above, assuming a transport distance of 100 km, a transport method of 2-ton truck, and a load factor of 58%, and uses an intensity close to these to calculate the carbon dioxide emissions. Note that the operator may specify which scenario to assume.

[0047] If the item in the cost estimate falls under the category of "materials and labor set," that is, if the standard unit price or market unit price is recorded in the cost estimate and the breakdown of fuel, electricity, materials, etc. cannot be read, the emissions calculation unit 43 calculates the carbon dioxide emissions by multiplying the construction cost by the carbon dioxide emission intensity that evaluates the civil engineering work.

[0048] If an item in the cost estimate falls under the category of survey, measurement, and design, that is, for geological, water quality, etc. survey, measurement, and design work included in the cost estimate, the emissions calculation unit 43 calculates the amount by multiplying it by the carbon dioxide emission intensity that evaluates the civil engineering services.

[0049] Figure 9 is a graph showing an example of the display of the user terminal 20 in this embodiment. The user terminal 20 may display a bar graph showing the carbon dioxide emissions (t-CO2) of one or more civil engineering works calculated by the emissions calculation unit 43. That is, the user terminal 20 may display multiple carbon dioxide emissions calculated by the emissions calculation unit 43 based on multiple calculation sheets acquired by the calculation sheet acquisition unit 41 in a comparable manner. This makes it easy to select a civil engineering work pattern that is suitable from multiple candidate patterns of civil engineering works in terms of carbon dioxide emissions. Note that the method of displaying the carbon dioxide emissions calculated by the emissions calculation unit 43 is not limited to the example in Figure 9, and may be displayed using other types of graphs or numerical values. Also, as shown in Figure 9, in the graph, the carbon dioxide emissions of each civil engineering work may be broken down into Scope 1, 2, and 3 as defined in the Greenhouse Gas (GHG) Protocol. That is, the emissions calculation unit 43 calculates carbon dioxide emissions for each Scope in the GHG Protocol based on the calculation sheets, and the user terminal 20 may display the carbon dioxide emissions for each Scope in the GHG Protocol in an identifiable manner. This makes it easier to analyze carbon dioxide emissions in detail for a particular type of civil engineering project, or to compare trends in carbon dioxide emissions across multiple types of civil engineering projects.

[0050] The carbon dioxide emission calculation system 10 of this embodiment allows for the calculation of carbon dioxide emissions using cost estimation software commonly used in civil engineering works. This improves efficiency and productivity during the calculation of carbon dioxide emissions and reduces calculation errors. Furthermore, the quantities of materials and equipment used in construction can be aggregated in accordance with the cost estimation guidelines, which are common rules, and the scope of aggregation can be standardized among those who aggregate the data when calculating carbon dioxide emissions. For these reasons, it is expected that this will promote carbon dioxide emission management for contractors and construction clients and contribute to carbon neutrality.

[0051] Furthermore, the present invention may also be provided in the following embodiments. (1) One embodiment of the present invention is a carbon dioxide emission calculation system comprising: an estimate acquisition unit that acquires an estimate for civil engineering work; an item estimation unit that estimates the item corresponding to the item in the estimate acquired by the estimate acquisition unit from among a plurality of predetermined items of carbon dioxide emission intensity; and an emission calculation unit that calculates the carbon dioxide emission for the civil engineering work using at least the carbon dioxide emission intensity of the item estimated by the item estimation unit and the quantity of the item in the estimate acquired by the estimate acquisition unit.

[0052] (2) Another embodiment of the present invention is the carbon dioxide emission calculation system described in (1), wherein the item estimation unit estimates the items using a model generated by machine learning.

[0053] (3) Another embodiment of the present invention is a carbon dioxide emission calculation system as described in (1) or (2), wherein the emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using at least the amount of the item in the cost sheet obtained by the cost sheet acquisition unit if the quantity unit of the item in the cost sheet obtained by the cost sheet acquisition unit does not match the unit of carbon dioxide emissions of the item estimated by the item estimation unit.

[0054] (4) Another embodiment of the present invention is a carbon dioxide emission calculation system as described in any of (1) to (3), wherein the emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using the amounts of the items in the cost estimate acquired by the cost estimate acquisition unit, further using the producer price for a specific year, the price ratio compared to a specific year, the ratio of producer price to purchase price, and the unit carbon dioxide emission intensity of the items estimated by the item estimation unit to calculate the carbon dioxide emissions of the civil engineering work.

[0055] (5) Another embodiment of the present invention is a carbon dioxide emission calculation system as described in any of (1) to (4), comprising a code storage unit that stores the correspondence between a management code for an item used in the calculation sheet and any of the plurality of items, wherein the item estimation unit uses the model to estimate the item if the item within the plurality of items that corresponds to an item in the calculation sheet acquired by the calculation sheet acquisition unit cannot be obtained from the code storage unit.

[0056] (6) Another embodiment of the present invention is a carbon dioxide emission calculation system as described in any of (1) to (5), comprising a display unit that displays a plurality of carbon dioxide emission amounts calculated by the emission calculation unit based on a plurality of accumulation reports acquired by the accumulation report acquisition unit in a comparable manner.

[0057] (7) Another embodiment of the present invention is a carbon dioxide emission calculation system as described in any of (1) to (6), wherein the emission calculation unit calculates carbon dioxide emissions for each Scope in the GHG protocol based on the summaries acquired by the summaries acquisition unit.

[0058] (8) Another embodiment of the present invention is a method for calculating carbon dioxide emissions, comprising: a first step of obtaining an estimate for civil engineering work; a second step of estimating the items from a plurality of predetermined items of carbon dioxide emission intensity that correspond to the items in the estimate obtained in the first step; and a third step of calculating the carbon dioxide emissions of the civil engineering work using at least the carbon dioxide emission intensity of the items estimated in the second step and the quantities of the items in the estimate obtained in the first step.

[0059] (9) Another embodiment of the present invention is a program that causes a computer to function as a cost estimate acquisition unit that acquires cost estimates for civil engineering works, an item estimation unit that estimates the items corresponding to the items in the cost estimate acquisition unit acquired by the cost estimate acquisition unit from among a plurality of predetermined items of carbon dioxide emission intensity, and an emission calculation unit that calculates the carbon dioxide emissions of the civil engineering works using at least the carbon dioxide emission intensity of the items estimated by the item estimation unit and the quantities of the items in the cost estimate acquisition unit acquired by the cost estimate acquisition unit.

[0060] Alternatively, the user terminal 20 and emissions calculation server 40 may be realized by recording a program for realizing the functions of the user terminal 20 and emissions calculation server 40 in Figure 1 onto a computer-readable recording medium, and then loading and executing the program recorded on this recording medium into a computer system. The term "computer system" here includes hardware such as the operating system and peripheral devices.

[0061] Furthermore, "computer system" shall also include the homepage provisioning environment (or display environment) if a WWW system is being used. Furthermore, "computer-readable recording media" refers to portable media such as flexible disks, magneto-optical disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into computer systems. Moreover, "computer-readable recording media" also includes those that dynamically hold programs for a short period of time, such as communication lines used when transmitting programs over networks such as the Internet or communication lines such as telephone lines, and those that hold programs for a certain period of time, such as volatile memory inside computer systems that act as servers or clients in such cases. In addition, the above-mentioned programs may be for the purpose of realizing some of the functions described above, and may also be able to realize the above-mentioned functions in combination with programs already recorded in the computer system.

[0062] While embodiments of this invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments and may include design modifications and the like that do not depart from the spirit of this invention. [Explanation of symbols]

[0063] 10. Carbon Dioxide Emission Calculation System 20 User Terminals 21 Browser Section 30 Networks 40 Emissions calculation server 41 Cost Estimation Department 42 item estimation part 43 Emissions Calculation Department 44 Code Storage Unit 45 Model Memory Unit 46 Unit Cost Storage Unit 47 Price storage unit

Claims

1. The cost estimate acquisition department acquires cost estimates for civil engineering works, An item estimation unit that estimates the item corresponding to the item in the calculation sheet acquired by the calculation sheet acquisition unit, from among several predetermined items of carbon dioxide emission intensity, An emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using at least the unit carbon dioxide emission intensity of the item estimated by the item estimation unit and the quantity of the item in the cost estimate acquired by the cost estimate acquisition unit. A carbon dioxide emission calculation system equipped with the following features.

2. The carbon dioxide emission calculation system according to claim 1, wherein the item estimation unit estimates the items using a model generated by machine learning.

3. The carbon dioxide emission calculation system according to claim 1, wherein if the quantity unit of the items in the calculation sheet acquired by the calculation sheet acquisition unit does not match the unit of carbon dioxide emission for the items estimated by the item estimation unit, the emission calculation unit calculates the carbon dioxide emission for the civil engineering work using at least the amount of the items in the calculation sheet acquired by the calculation sheet acquisition unit.

4. The carbon dioxide emission calculation system according to claim 3, wherein the emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using the amounts of the items in the cost estimate acquired by the cost estimate acquisition unit, further using the producer price for a specific year, the price ratio compared to a specific year, the ratio of producer price to buyer price, and the unit carbon dioxide emission intensity of the items estimated by the item estimation unit to calculate the carbon dioxide emissions of the civil engineering work.

5. The system includes a code storage unit that stores the correspondence between the management code of an item used in the aforementioned cost estimate and any of the aforementioned items, The carbon dioxide emission calculation system according to any one of claims 1 to 4, wherein the item estimation unit, when it is not possible to obtain from the code storage unit an item within the plurality of items that corresponds to an item in the calculation sheet acquired by the calculation sheet acquisition unit, estimates the item using a model generated by machine learning.

6. The carbon dioxide emission calculation system according to claim 1, further comprising a display unit that displays a plurality of carbon dioxide emission amounts calculated by the emission calculation unit based on a plurality of accumulation reports acquired by the accumulation report acquisition unit in a comparable manner.

7. The carbon dioxide emission calculation system according to claim 1, wherein the emission calculation unit calculates carbon dioxide emissions for each Scope in the GHG protocol based on the summaries acquired by the summaries acquisition unit.

8. The first step in obtaining a cost estimate for civil engineering works, A second step involves estimating the items that correspond to the items in the calculation sheet obtained in the first step, among several predetermined items of carbon dioxide emission intensity, A third step in which the carbon dioxide emissions of the civil engineering work are calculated using at least the carbon dioxide emission intensity of the items estimated in the second step and the quantities of the items in the calculation sheet obtained in the first step. A method for calculating carbon dioxide emissions, comprising the following characteristics.

9. Computers, The cost estimate acquisition department acquires cost estimates for civil engineering works. An item estimation unit that estimates the item corresponding to the item in the calculation sheet acquired by the calculation sheet acquisition unit, from among several predetermined items of carbon dioxide emission intensity. An emission calculation unit calculates the carbon dioxide emissions of the civil engineering work using at least the unit carbon dioxide emission intensity of the item estimated by the item estimation unit and the quantity of the item in the cost estimate acquired by the cost estimate acquisition unit. A program designed to function as such.

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