Cost management method for construction cite and cost management system using the same

Abstract

The present invention relates to a method for cost management at a construction site where multiple buildings are constructed simultaneously, comprising: a BIM output quantity recording step for recording the output quantity, which is the quantity calculated by BIM for each process of the multiple buildings; an execution quantity calculation step for calculating the execution quantity, which is the quantity actually consumed while constructing the multiple buildings; a construction error calculation step for calculating the construction error by comparing the output quantity and the execution quantity; an error cause analysis step for analyzing the cause of error and the error rate of the BIM from the construction error; and a period-by-period material requirement prediction step for predicting the material requirements of the construction site of the multiple buildings at predetermined period intervals, considering the progress status of the processes of the multiple buildings and the error rate. By presenting a cost management method for a construction site where multiple buildings are constructed, the invention enables the accurate prediction of the material requirements for each building according to the process of each building at the construction site, thereby facilitating the smooth supply of materials.

Description

Technology Field

[0001] The present invention relates to the field of construction technology, and more specifically, to a method and system for cost management at a construction site. Background Technology

[0002] Since an apartment complex consists of multiple buildings (each apartment building, daycare center, power generation facility, septic tank, community facilities, underground parking lot, etc.), the construction site of an apartment complex is characterized by the fact that these multiple buildings are constructed virtually simultaneously.

[0003] Each building is composed of various components (foundations, columns, walls, beams, slabs, stairs, etc.), and these components are constructed using various materials (concrete, rebar, etc.).

[0004] In addition, building construction is carried out through various processes (excavation, installation of temporary structures, installation of formwork, reinforcement, concrete pouring and curing, etc.), and in high-rise buildings such as apartments, these processes are repeated for each floor.

[0005] Therefore, for a construction site where multiple buildings are being constructed to proceed smoothly and efficiently, the forecasting and supply of required materials must be carried out seamlessly in accordance with the construction process of each building.

[0006] However, conventionally, there was a problem in that efficient construction was difficult because the forecasting and supply of such quantities could not be carried out smoothly. The problem to be solved

[0007] The present invention was developed to solve the aforementioned problems and aims to present a cost management method and system for a construction site that enables the smooth supply of materials by accurately predicting the quantity of materials required according to the construction process of each building at a construction site where multiple buildings are being constructed. means of solving the problem

[0008] To solve the above problem, the present invention provides a method for cost management at a construction site where multiple buildings are constructed simultaneously, comprising: a BIM output quantity recording step for each process of the multiple buildings, wherein the output quantity is a quantity calculated by BIM; an execution quantity calculation step for calculating the execution quantity, wherein the quantity actually consumed while constructing the multiple buildings is calculated; a construction error calculation step for calculating a construction error by comparing the output quantity and the execution quantity; an error cause analysis step for analyzing the cause of error and the error rate of the BIM from the construction error; and a period-by-period material requirement prediction step for predicting the material requirements of the construction site of the multiple buildings at predetermined period intervals, considering the progress status of the multiple buildings and the error rate.

[0009] The above BIM output quantity recording step preferably includes: a BIM building-specific output quantity recording step for recording the building-specific output quantity calculated by BIM for each building; a BIM floor-specific output quantity recording step for recording the floor-specific output quantity calculated by BIM for each floor; a BIM component-specific output quantity recording step for recording the component-specific output quantity calculated by BIM for each component; and a BIM material-specific output quantity recording step for recording the material-specific output quantity calculated by BIM for each material.

[0010] The above execution quantity calculation step preferably includes: a building-specific execution quantity calculation step for calculating the building-specific execution quantity, which is the quantity required for each building while constructing each building; a floor-specific execution quantity calculation step for calculating the floor-specific execution quantity, which is the quantity required for each floor while constructing each building; a component-specific execution quantity calculation step for calculating the component-specific execution quantity, which is the quantity required for each component while constructing each building; and a material-specific execution quantity calculation step for calculating the material-specific execution quantity, which is the quantity required for each material while constructing the building.

[0011] The above construction error calculation step preferably includes: a building-specific construction error calculation step for calculating a building-specific construction error by comparing the building-specific calculated quantity with the building-specific actual quantity; a floor-specific construction error calculation step for calculating a floor-specific construction error by comparing the floor-specific calculated quantity with the floor-specific actual quantity; a component-specific construction error calculation step for calculating a component-specific construction error by comparing the component-specific calculated quantity with the component-specific actual quantity; and a material-specific construction error calculation step for calculating a material-specific construction error by comparing the material-specific calculated quantity with the material-specific actual quantity.

[0012] The above error cause analysis step preferably includes: a step of calculating an error rate for each combination by combining the above building-specific construction error, floor-specific construction error, component-specific construction error, and material-specific construction error; and a step of analyzing the cause of the error based on the combination of construction errors with the largest error rate among the combinations of the above construction errors.

[0013] It is desirable to further include a BIM correction step for correcting the BIM based on the analyzed cause of error.

[0014] It is preferable that the system for cost management of a construction site where multiple buildings are constructed simultaneously includes: a BIM output quantity DB (100) that records the output quantity, which is the quantity calculated by BIM for each process of the multiple buildings; an execution quantity calculation unit (200) that calculates the execution quantity, which is the quantity actually consumed while constructing the multiple buildings; a construction error calculation unit (300) that calculates a construction error by comparing the output quantity and the execution quantity; and a server (400) that analyzes the cause of error and the error rate of the BIM from the construction error, and predicts the material requirements of the construction site of the multiple buildings in units of a predetermined period, taking into account the progress status of the multiple buildings and the error rate.

[0015] The above BIM output volume DB (100) preferably includes: a BIM building output volume DB (110) that records the output volume per building, which is the volume calculated per building by BIM; a BIM floor output volume DB (120) that records the output volume per floor, which is the volume calculated per floor by BIM; a BIM component output volume DB (130) that records the output volume per component, which is the volume calculated per component by BIM; and a BIM material output volume DB (140) that records the output volume per material, which is the volume calculated per material by BIM.

[0016] The above execution quantity calculation unit (200) preferably includes: a building-specific execution quantity calculation unit (210) that calculates the building-specific execution quantity, which is the quantity required for each building while constructing each building; a floor-specific execution quantity calculation unit (220) that calculates the floor-specific execution quantity, which is the quantity required for each floor while constructing each building; a component-specific execution quantity calculation unit (230) that calculates the component-specific execution quantity, which is the quantity required for each component while constructing each building; and a material-specific execution quantity calculation unit (240) that calculates the material-specific execution quantity, which is the quantity required for each material while constructing the building.

[0017] The above construction error calculation unit (300) preferably includes: a building-specific construction error calculation unit (310) that calculates a building-specific construction error by comparing the building-specific calculation quantity and the building-specific execution quantity; a floor-specific construction error calculation unit (320) that calculates a floor-specific construction error by comparing the floor-specific calculation quantity and the floor-specific execution quantity; a component-specific construction error calculation unit (330) that calculates a component-specific construction error by comparing the component-specific calculation quantity and the component-specific execution quantity; and a material-specific construction error calculation unit (340) that calculates a material-specific construction error by comparing the material-specific calculation quantity and the material-specific execution quantity.

[0018] The above server (400) preferably includes: a combination error rate calculation unit (410) that calculates an error rate for each combination by combining the construction error per building, the construction error per floor, the construction error per component, and the construction error per material; and an error cause analysis unit (420) that analyzes the cause of the error based on the combination of the construction error with the largest error rate among the combinations of the above construction errors. Effects of the invention

[0019] The present invention presents a cost management method and system for a construction site that enables the smooth supply of materials by accurately predicting the quantity of materials required according to the construction process of each building at a construction site where multiple buildings are being constructed. Brief explanation of the drawing

[0020] FIGS. 1 and subsequent figures illustrate embodiments of the present invention, wherein FIG. 1 is a configuration diagram of a cost management system for a construction site. FIG. 2 is a captured image of a construction error calculation unit by building. FIG. 3 is a captured image of a construction error calculation unit by floor. FIG. 4 is a captured image of a construction error calculation unit by component. FIG. 5 is a captured image of a construction error calculation unit by material. FIG. 6 is a graph combining construction error by building and construction error by material (rebar). FIG. 7 is a graph combining construction error by building and construction error by material (concrete). FIG. 8 is a graph combining construction error by building, construction error by floor, and construction error by material (rebar). FIG. 9 is a graph combining construction error by building, construction error by floor, and construction error by material (concrete). FIG. 10 is an enlarged view of the main part of FIG. 2. FIG. 11 is an enlarged view of the main part of FIG. 3. FIG. 12 is an enlarged view of the main part of FIG. 4. FIG. 13 is FIG Enlarged view of the main part of 5. Fig. 14 is an enlarged view of the main part of Fig. 6. Fig. 15 is an enlarged view of the main part of Fig. 7. Fig. 16 is an enlarged view of the main part of Fig. 8. Fig. 17 is an enlarged view of the main part of Fig. 9. Specific details for implementing the invention

[0021] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0022] As illustrated in FIG. 1 and below, the present invention basically relates to a cost management system for a construction site where multiple buildings are constructed simultaneously, and comprises a BIM output volume DB (100), an execution volume calculation unit (200), a construction error calculation unit (300), and a server (400).

[0024] 1) BIM Output Volume DB (100)

[0025] This records the output quantities, which are the quantities calculated by BIM, for each process of multiple buildings.

[0026] The building being constructed is designed using a Building Information Model (BIM), and the quantity of materials predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) can be calculated, and the BIM quantity database (100) records these quantities for all processes of all buildings.

[0027] Specifically, the BIM output volume DB (100) is configured to include a BIM building-specific output volume DB (110), a BIM floor-specific output volume DB (120), a BIM component-specific output volume DB (130), and a BIM material-specific output volume DB (140).

[0028] The BIM building-specific output volume DB (110) records the building-specific output volume, which is the volume calculated by BIM for each building (each building of an apartment complex, a daycare center, a power generation facility, a septic tank, a community facility for residents, an underground parking lot, etc.) that is constructed simultaneously. Here, 'building-specific output volume' means 'the volume of materials (concrete, rebar, etc.) predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each building'.

[0029] The BIM floor-by-floor output DB (120) records the floor-by-floor output, which is the volume calculated by BIM for each floor (basement floor, ground floor) of each building being constructed simultaneously. Here, 'floor-by-floor output' means 'the volume of materials (concrete, rebar, etc.) predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each floor of each building.'

[0030] The BIM component-specific quantity DB (130) records the component-specific quantity calculated by BIM for each component (foundation, column, wall, beam, slab, stairs, etc.) of each building being constructed simultaneously. Here, 'component-specific quantity' means 'the quantity of materials (concrete, rebar, etc.) predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each component of each building.'

[0031] The BIM material-specific output quantity DB (140) records the material-specific output quantity, which is the quantity calculated by BIM for each material (concrete, rebar, etc.) required for the construction of each building being constructed simultaneously.

[0032] In particular, for reinforcing bars, the quantity of materials is recorded by classifying them according to the required diameter.

[0034] 2) Execution quantity calculation unit (200)

[0035] This calculates the actual quantity of materials consumed while constructing multiple buildings.

[0036] Specifically, the execution quantity calculation unit (200) is configured to include an execution quantity calculation unit (210) by building, an execution quantity calculation unit (220) by floor, an execution quantity calculation unit (230) by component, and an execution quantity calculation unit (240) by material.

[0037] The building-specific execution quantity calculation unit (210) calculates the building-specific execution quantity, which is the quantity required for each building while constructing each building (each building of an apartment complex, a daycare center, a power generation facility, a septic tank, a community facility for residents, an underground parking lot, etc.). Here, 'building-specific execution quantity' means 'the quantity of materials (concrete, rebar, etc.) required for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each building'.

[0038] The floor-by-floor execution quantity calculation unit (220) calculates the floor-by-floor execution quantity, which is the quantity required for each floor while constructing each building. Here, "floor-by-floor execution quantity" means "the quantity of materials (concrete, rebar, etc.) required for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each floor of each building."

[0039] The member-specific execution quantity calculation unit (230) calculates the member-specific execution quantity, which is the quantity required for each member while constructing each building member (foundation, column, wall, beam, slab, stairs, etc.). Here, 'member-specific execution quantity' means 'the quantity of materials (concrete, rebar, etc.) required for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each building member.'

[0040] The material-specific execution quantity calculation unit (240) calculates the material-specific execution quantity, which is the quantity required for each material while constructing each building using various materials (concrete, rebar, etc.).

[0042] 3) Construction error calculation unit (300)

[0043] This calculates the construction error by comparing the output quantity of the BIM output quantity DB (100) with the execution quantity of the execution quantity calculation unit (200).

[0044] The construction error calculation unit (300) is specifically configured to include a construction error calculation unit (310) per building, a construction error calculation unit (320) per floor, a construction error calculation unit (330) per member, and a construction error calculation unit (340) per material.

[0045] The building-specific construction error calculation unit (310) calculates the building-specific construction error by comparing the building-specific calculated quantity of the BIM calculated quantity DB (100) with the building-specific actual quantity calculated by the actual quantity calculation unit (200). (Fig. 2) As described above, 'building-specific calculated quantity' means 'the quantity of materials (concrete, rebar, etc.) predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each building.' As described above, 'building-specific actual quantity' means 'the quantity of materials (concrete, rebar, etc.) required for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each building.' Therefore, the building-specific construction error refers to the difference between the quantity of materials (concrete, rebar, etc.) predicted for the construction of each building and the quantity of materials (concrete, rebar, etc.) actually required. Fig. Figure 10 is an enlarged view of the main part of Figure 2, showing the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual required quantity) of materials (rebar) for each building.

[0046] The floor-by-floor construction error calculation unit (320) calculates the floor-by-floor construction error by comparing the floor-by-floor calculated quantity of the BIM calculated quantity DB (100) with the floor-by-floor actual quantity calculated by the actual quantity calculation unit (200). (Fig. 3) As described above, 'floor-by-floor calculated quantity' means 'the quantity of materials (concrete, rebar, etc.) predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each floor of each building.' As described above, 'floor-by-floor actual quantity' means 'the quantity of materials (concrete, rebar, etc.) required for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each floor of each building.' Therefore, the floor-by-floor construction error is the difference between the quantity of materials (concrete, rebar, etc.) predicted for the construction of each floor of each building and the quantity of materials (concrete, rebar, etc.) actually required. It refers to the difference in quantity. Fig. 11 is an enlarged view of the main part of Fig. 3, and is a graph showing the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual required quantity) of materials (rebar) for each floor of a specific building.

[0047] The member-specific construction error calculation unit (330) calculates the member-specific construction error by comparing the member-specific calculated quantity of the BIM calculated quantity DB (100) with the member-specific actual quantity calculated by the member-specific execution quantity calculation unit (200). (Fig. 4) As described above, 'member-specific calculated quantity' means 'the quantity of materials (concrete, rebar, etc.) predicted for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each member of each building.' As described above, 'floor-specific actual quantity' means 'the quantity of materials (concrete, rebar, etc.) required for each process (formwork installation, rebar placement, concrete pouring and curing, etc.) for the construction of each member of each building.' Therefore, the member-specific construction error is the difference between the quantity of materials (concrete, rebar, etc.) predicted for the construction of each member of each building and the quantity of materials (concrete, rebar, etc.) actually required. It refers to the difference in quantity. Fig. 12 is an enlarged view of the main part of Fig. 4, and is a graph showing the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual required quantity) of materials (rebar) for each member.

[0048] The material-specific construction error calculation unit (340) calculates the material-specific construction error by comparing the material-specific calculated quantity of the BIM calculated quantity DB (100) with the material-specific actual quantity calculated by the material-specific calculation unit (200). (Fig. 5) As described above, 'material-specific calculated quantity' means 'the quantity calculated by BIM for each material (concrete, rebar, etc.) required for the construction of each building.' As described above, 'material-specific actual quantity' means 'the quantity required for each material while constructing each building using various materials (concrete, rebar, etc.).' Therefore, the material-specific construction error refers to the difference between the quantity of materials (concrete, rebar, etc.) predicted for construction and the quantity of materials (concrete, rebar, etc.) actually required. Fig. 13 is an enlarged view of the main part of Fig. 5, showing the overall calculated quantity (predicted quantity) of the material (rebar) and This is a graph showing the difference (construction error) between the executed quantity (actual required quantity) and the actual quantity.

[0050] 4) Server (400)

[0051] This analyzes the cause of error and the error rate of BIM from the construction error calculated by the construction error calculation unit (300), and predicts the material requirements of the construction sites of the multiple buildings in units of a predetermined period by considering the progress status of the multiple buildings and the error rate.

[0052] Specifically, the server (400) is configured to include a combination-specific error rate calculation unit (410) and an error cause analysis unit (420).

[0053] The error rate calculation unit (410) calculates the error rate for each combination by combining the construction error by building, the construction error by floor, the construction error by member, and the construction error by material. The error rate can be calculated by the following mathematical formula 1, etc. [Mathematical Formula 1]

[0054] For example, by combining the construction error by building and the construction error by material (rebar), regarding the rebar used in the construction of each building, it is possible to verify the construction error between the calculated quantity (predicted) by BIM and the actual quantity required, and to calculate the error rate. (Fig. 6) Fig. 14 is an enlarged view of the main part of Fig. 6, which combines the construction error by building and the construction error by material (concrete), and shows the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual required quantity) of the material (rebar) for each building (apartment, apartment pit (annex building), parking lot and annex building).

[0055] By combining the construction error by building and the construction error by material (concrete), regarding the concrete used in the construction of each building, it is possible to verify the construction error between the calculated quantity (predicted quantity) and the actual quantity required, which is the actual quantity, and to calculate the error rate. (Fig. 7) Fig. 15 is an enlarged view of the main part of Fig. 7, which combines the construction error by building and the construction error by material (concrete), and shows the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual quantity required) of the material (concrete) for each building (apartment, apartment pit (annex building), parking lot and annex building).

[0056] By combining the construction error by building, the construction error by floor, and the construction error by material (rebar), regarding the rebar used in the construction of each floor of each building, it is possible to verify the construction error between the calculated quantity (predicted quantity) and the actual quantity required, which is the actual quantity, and to calculate the error rate. (Fig. 8) Fig. 16 is an enlarged view of the main part of Fig. 8, which combines the construction error by building, the construction error by floor, and the construction error by material (rebar), and is a graph showing the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual quantity required) of the material (rebar) for each floor of each building (Apartment A, B, C).

[0057] By combining the construction error by building, the construction error by floor, and the construction error by material (concrete), regarding the concrete used for construction of each floor of each building, it is possible to verify the construction error between the calculated quantity (predicted quantity) and the actual quantity required, which is the actual quantity, and to calculate the error rate. (Fig. 9) Fig. 17 is an enlarged view of the main part of Fig. 9, which combines the construction error by building, the construction error by floor, and the construction error by material (concrete), and shows the difference (construction error) between the calculated quantity (predicted quantity) and the actual quantity (actual quantity required) of the material (concrete) for each floor of each building (parking lot and annex buildings A, B, and C).

[0058] The error cause analysis unit (420) analyzes the cause of error based on the combination of construction errors with the largest error rate among the combinations of multiple construction errors described above.

[0059] For example, if the error rate is highest when combining construction errors by building and construction errors by material (rebar), the cause of the error can be analyzed as an error in the BIM prediction regarding the material (rebar) requirements for a specific building.

[0060] If the error rate is highest when combining construction errors by building, construction errors by floor, and construction errors by material (rebar), the cause of the error can be analyzed as an error in the BIM prediction regarding the material (rebar) requirements for a specific floor (or several floors) of a specific building.

[0061] After analyzing the causes of the error, the material requirements for the construction sites of multiple buildings are predicted at predetermined intervals, taking into account the progress status and error rates of the construction of multiple buildings.

[0062] For example, if the cause of the error is an incorrect BIM prediction regarding the material (rebar) requirements for a specific building, future material requirements are predicted taking this into account, as there is a high probability that such errors will continue to occur in future processes.

[0063] If the output quantity is smaller than the execution quantity, the predicted material requirement must be increased, and conversely, the predicted material requirement can be decreased.

[0064] However, since the present invention relates to a method for cost management at a construction site where multiple buildings are constructed simultaneously, the predicted material requirements may increase for some buildings and decrease for others; therefore, the future material requirements are predicted by combining these factors.

[0065] In this way, it is more desirable to reduce the error rate itself by correcting the BIM based on the analyzed causes of error.

[0067] delete

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[0069] delete

[0070] The foregoing merely describes some preferred embodiments that can be implemented by the present invention. As is well known, the scope of the present invention should not be interpreted as being limited to the above embodiments, and all technical concepts that share the fundamental principles with the technical concept of the present invention described above shall be considered to be included within the scope of the present invention. Explanation of the symbols

[0071] 100 : BIM Output DB 110 : BIM Output DB by Building 120: BIM Output Volume DB by Floor 130: BIM Output Volume DB by Component 140 : BIM Material-Specific Output DB 200 : Execution Volume Calculation Section 210: Execution Quantity Calculation Unit by Building 220: Execution Quantity Calculation Unit by Floor 230 : Calculation section for execution quantity by component 240 : Calculation section for execution quantity by material 300: Construction Error Calculation Unit 310: Construction Error Calculation Unit by Building 320: Construction error calculation unit by floor 330: Construction error calculation unit by component 340 : Construction Error Calculation Unit by Material 400 : Server 410: Error rate calculation unit by combination 420: Error cause analysis unit

Claims

Claim 1 A method for managing costs at a construction site where multiple buildings are constructed simultaneously, comprising: a BIM output quantity recording step for each process of the multiple buildings, wherein the output quantity is a quantity calculated by BIM; an execution quantity calculation step for calculating the execution quantity, wherein the quantity actually consumed while constructing the multiple buildings is calculated; a construction error calculation step for calculating a construction error by comparing the output quantity and the execution quantity; an error cause analysis step for analyzing the cause of error and the error rate of the BIM from the construction error; and a period-by-period material requirement prediction step for predicting the material requirements of the construction site of the multiple buildings on a predetermined period basis, considering the progress status of the multiple buildings and the error rate. Claim 2 A method for managing costs at a construction site according to claim 1, wherein the BIM output quantity recording step comprises: a BIM building-specific output quantity recording step for recording the building-specific output quantity calculated by BIM for each building; a BIM floor-specific output quantity recording step for recording the floor-specific output quantity calculated by BIM for each floor; a BIM component-specific output quantity recording step for recording the component-specific output quantity calculated by BIM for each component; and a BIM material-specific output quantity recording step for recording the material-specific output quantity calculated by BIM for each material. Claim 3 A method for cost management at a construction site according to paragraph 2, wherein the execution quantity calculation step comprises: a building-specific execution quantity calculation step for calculating the execution quantity per building, which is the quantity required per building while constructing each of the said buildings; a floor-specific execution quantity calculation step for calculating the execution quantity per floor, which is the quantity required per floor while constructing each of the said buildings; a component-specific execution quantity calculation step for calculating the execution quantity per component, which is the quantity required per component while constructing each of the said buildings; and a material-specific execution quantity calculation step for calculating the execution quantity per material, which is the quantity required per material while constructing the said buildings. Claim 4 A method for cost management at a construction site according to claim 3, wherein the construction error calculation step comprises: a building-specific construction error calculation step for calculating a building-specific construction error by comparing the building-specific calculated quantity with the building-specific actual quantity; a floor-specific construction error calculation step for calculating a floor-specific construction error by comparing the floor-specific calculated quantity with the floor-specific actual quantity; a component-specific construction error calculation step for calculating a component-specific construction error by comparing the component-specific calculated quantity with the component-specific actual quantity; and a material-specific construction error calculation step for calculating a material-specific construction error by comparing the material-specific calculated quantity with the material-specific actual quantity. Claim 5 A method for managing costs at a construction site, characterized in that, in claim 4, the step of analyzing the cause of error comprises: a step of calculating an error rate for each combination by combining the construction error by building, the construction error by floor, the construction error by member, and the construction error by material; and a step of analyzing the cause of error based on the combination of construction errors with the largest error rate among the combinations of the multiple construction errors. Claim 6 A method for managing costs at a construction site, characterized by further including a BIM correction step for correcting the BIM based on the analyzed cause of error in claim 1. Claim 7 A cost management system for a construction site where multiple buildings are constructed simultaneously, comprising: a BIM output quantity DB (100) that records the output quantity, which is the quantity calculated by BIM for each process of the multiple buildings; an execution quantity calculation unit (200) that calculates the execution quantity, which is the quantity actually consumed while constructing the multiple buildings; a construction error calculation unit (300) that calculates a construction error by comparing the output quantity and the execution quantity; and a server (400) that analyzes the cause of error and the error rate of the BIM from the construction error, and predicts the material requirements of the construction site of the multiple buildings in units of a predetermined period, taking into account the progress status of the multiple buildings and the error rate. Claim 8 A method for managing costs at a construction site, characterized in that, in claim 7, the above BIM output quantity DB (100) includes: a BIM building-specific output quantity DB (110) that records the output quantity per building, which is the quantity calculated per building by BIM; a BIM floor-specific output quantity DB (120) that records the output quantity per floor, which is the quantity calculated per floor by BIM; a BIM component-specific output quantity DB (130) that records the output quantity per component, which is the quantity calculated per component by BIM; and a BIM material-specific output quantity DB (140) that records the output quantity per material, which is the quantity calculated per material by BIM. Claim 9 In claim 8, the above execution quantity calculation unit (200) comprises: a building-specific execution quantity calculation unit (210) for calculating the building-specific execution quantity, which is the quantity required for each building while constructing each building; a floor-specific execution quantity calculation unit (220) for calculating the floor-specific execution quantity, which is the quantity required for each floor while constructing each building; a component-specific execution quantity calculation unit (230) for calculating the component-specific execution quantity, which is the quantity required for each component while constructing each building; and a material-specific execution quantity calculation unit (240) for calculating the material-specific execution quantity, which is the quantity required for each material while constructing the building. Claim 10 In claim 9, the construction error calculation unit (300) comprises: a building-specific construction error calculation unit (310) that calculates a building-specific construction error by comparing the building-specific calculation quantity and the building-specific execution quantity; a floor-specific construction error calculation unit (320) that calculates a floor-specific construction error by comparing the floor-specific calculation quantity and the floor-specific execution quantity; a component-specific construction error calculation unit (330) that calculates a component-specific construction error by comparing the component-specific calculation quantity and the component-specific execution quantity; and a material-specific construction error calculation unit (340) that calculates a material-specific construction error by comparing the material-specific calculation quantity and the material-specific execution quantity. Claim 11 A construction site cost management system characterized in that, in the 10th paragraph, the server (400) comprises: a combination error rate calculation unit (410) that calculates an error rate for each combination by combining the construction error by building, the construction error by floor, the construction error by component, and the construction error by material; and an error cause analysis unit (420) that analyzes the cause of the error based on the combination of the construction error with the largest error rate among the combinations of the construction errors.

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