Engineering cost assisting method and system based on digital twinning

Abstract

The invention relates to the technical field of engineering cost, and provides an engineering cost assisting method and system based on digital twinning, and the method comprises the steps: building a corresponding building digital twinning body based on a BIM model, obtaining an incidence relation between a built region and a construction time length based on real-time building data, and obtaining a building digital twinning body; and the obtained construction time period is substituted into the engineering cost prediction model to calculate an engineering cost reference value according to the time required by each building module in the remaining unbuilt area of the digital twinborn balance and the distributed time period, and the model predicts the purchase cost under the fluctuation of the material price in the corresponding time period of the unbuilt area. The engineering cost reference value and the engineering cost planning value are compared to realize engineering cost auxiliary prompt, the cost can be calculated along with the process in the building construction process, the method is efficient and accurate, and the cost progress control of engineering construction is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of engineering cost technology, and in particular to an engineering cost auxiliary method and system based on digital twins. Background Art

[0002] During the construction process of a building project, there may be a large deviation between the budget and the actual cost due to factors such as design changes and material price adjustments. In order to avoid a large deviation between the budget and the actual cost, cost estimation during the construction process can avoid this situation. However, the existing technology lacks the ability to quickly update the frequently changing market and project characteristics, which makes the calculation of project cost inefficient as the construction progresses, which is not conducive to cost control of project construction. Summary of the invention

[0003] The present invention provides an engineering cost auxiliary method based on digital twin, which is used to solve the problem of low efficiency in calculating engineering cost during construction in the prior art.

[0004] The first aspect of the present invention provides an engineering cost assistance method based on digital twins, comprising: Obtain the BIM model of the building to be constructed, and build the corresponding building digital twin based on the BIM model of the building to be constructed; obtain real-time construction data, obtain the current constructed area and the corresponding construction time length, and identify the correlation between the constructed area and the construction time length; identify the remaining unconstructed area, and obtain the construction time length of each module based on the correlation between the constructed area and the construction time length; Obtain the construction plan, identify the construction sequence of each module in the remaining unbuilt area, and use the digital twin to predict the construction time period of each module in the remaining unbuilt area according to the construction sequence and construction time length, obtain the construction time period of each module, substitute it into the engineering cost reference model, and obtain the engineering cost reference value. The engineering cost reference model is specifically: ; in, is the reference value of the project cost. is the number of modules in the remaining unbuilt area, is the number of material types under the nth module in the unbuilt area, is the starting point of the construction period of the nth module in the unbuilt area. is the end point of the construction period of the nth module in the unbuilt area, is the function of the price fluctuation of the mth type of material over time, is the demand for the mth type of material in the nth module; Obtain the project cost planning value, compare the project cost reference value with the project cost planning value, and issue a prompt if the difference exceeds the preset threshold.

[0005] Optionally, the identification of the association between the constructed area and the construction time length is specifically as follows: each building module is divided in the constructed area, and the amount of each type of material consumed in the construction of each module is obtained, and the corresponding construction time length is substituted into the association model between the constructed area and the construction time length to obtain the association between the constructed area and the construction time length, and the association model between the constructed area and the construction time length is: ; in, is the construction time length of the cth module, is the influence coefficient of the cth module type on the construction time, is the number of material types in the cth module, is the demand for the ith material type under the cth module, is the influence coefficient of the i-th material type on the construction time.

[0006] Optionally, after obtaining the construction time period of each module, the step further includes: According to the construction type and construction time period of each module, the labor cost of the project cost is calculated and the reference value of the project cost is revised.

[0007] The second aspect of the present application provides an engineering cost assistance system based on digital twins, including: The construction time relationship analysis module is used to obtain the BIM model of the building to be constructed, and build the corresponding building digital twin based on the BIM model of the building to be constructed; obtain real-time construction data, obtain the current constructed area and the corresponding construction time length, and identify the correlation between the constructed area and the construction time length; identify the remaining unconstructed area, and obtain the construction time length of each module according to the correlation between the constructed area and the construction time length; The engineering cost calculation module is used to obtain the construction plan, identify the construction sequence of each module in the remaining unconstructed area, and predict the construction time period of each module in the remaining unconstructed area with the digital twin according to the construction sequence and construction time length, and obtain the construction time period of each module, and substitute it into the engineering cost reference model to obtain the engineering cost reference value. The engineering cost reference model is specifically: ; in, is the reference value of the project cost. is the number of modules in the remaining unbuilt area, is the number of material types under the nth module in the unbuilt area, is the starting point of the construction period of the nth module in the unbuilt area, is the end point of the construction period of the nth module in the unbuilt area, is the function of the price fluctuation of the mth type of material over time, is the demand for the mth type of material in the nth module; The cost auxiliary prompt module is used to obtain the engineering cost planning value, compare the engineering cost reference value with the engineering cost planning value, and issue a prompt if the difference exceeds a preset threshold.

[0008] Optionally, in the construction time relationship analysis module, identifying the correlation between the constructed area and the construction time length is specifically as follows: dividing each building module in the constructed area, and obtaining the amount of each type of material consumed in the construction of each module, substituting the corresponding construction time length into the correlation model between the constructed area and the construction time length, and obtaining the correlation between the constructed area and the construction time length, and the correlation model between the constructed area and the construction time length is: ; in, is the construction time length of the cth module, is the influence coefficient of the cth module type on the construction time, is the number of material types in the cth module, is the demand for the ith material type under the cth module, is the influence coefficient of the i-th material type on the construction time.

[0009] Optionally, in the engineering cost calculation module, after obtaining the construction time period of each module, the following steps are further included: According to the construction type and construction time period of each module, the labor cost of the project cost is calculated and the reference value of the project cost is revised.

[0010] The third aspect of the present application provides a construction cost assistance method and device based on digital twins, the device comprising a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute an engineering cost assistance method based on digital twins as described in any one of the first aspects of the present invention according to the instructions in the program code.

[0011] The fourth aspect of the present application provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute an engineering cost assistance method based on digital twins as described in any one of the first aspects of the present invention.

[0012] It can be seen from the above technical scheme that the present invention has the following advantages: a corresponding digital twin of a building is established based on a BIM model, and the correlation between the constructed area and the length of construction time is obtained based on real-time building data. The time required for each building module in the remaining unconstructed area of ​​the digital twin and the distribution time period are used to bring the obtained construction time period into the project cost prediction model to calculate the project cost reference value. The model predicts the procurement cost of the unconstructed area under the fluctuation of material prices in the corresponding time period, and compares the project cost reference value with the project cost planning value to realize project cost auxiliary prompts. The cost can be calculated as the construction progresses, which is efficient and accurate, and ensures the control of the cost progress of the project construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0014] Figure 1 This is a flow chart of an engineering cost assistance method based on digital twins; Figure 2 This is a structural diagram of an engineering cost auxiliary system based on digital twins. DETAILED DESCRIPTION

[0015] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] The present invention provides an engineering cost auxiliary method based on digital twin, which is used to solve the problem of low efficiency in calculating engineering cost during construction in the prior art.

[0017] See also Figure 1 , Figure 1 The first flowchart of an engineering cost assistance method based on digital twins provided in an embodiment of the present invention.

[0018] S100, obtaining a BIM model of the building to be constructed, and constructing a corresponding building digital twin based on the BIM model of the building to be constructed; obtaining real-time construction data, obtaining the current constructed area and the corresponding construction time length, and identifying the correlation between the constructed area and the construction time length; identifying the remaining unconstructed area, and obtaining the construction time length of each module according to the correlation between the constructed area and the construction time length; It should be noted that for the buildings to be constructed, a BIM model will be pre-established based on the design drawings. The BIM model contains the geometric information, professional attributes and status information of the building. The digital twin needs to replicate the geometric form of the physical building, including the size, shape and structure of the building. Therefore, all component elements and system information of the physical space can be digitally represented based on the BIM model to construct the corresponding building digital twin. Digital twins can ensure the accuracy and practicality of the model through real-time data updates. Therefore, sensor equipment such as cameras or infrared laser equipment are set up at the construction site to obtain project progress data and update the digital twin according to the actual progress of the project. During the construction phase, the digital twin building can track and monitor the progress of the construction in real time. For example, the sensor can obtain the regional location of the existing physical building before the start of construction every day, and then identify the domain location of the existing physical building after the construction is completed. The construction area can be divided into a combination of multiple building modules. The modules can be the basic components of the building, such as beams, walls, and columns. The corresponding modules are obtained in the model size according to the regional location to determine the constructed area with a time length of days as the unit; the corresponding area constructed every day can be obtained in the digital twin. Building data, because the data includes structural dimension data, such as the construction of a number of beams and load-bearing walls on the same day, the construction progress of the building module per unit time can be obtained, and then the correlation between the current constructed area and the construction time can be identified. This correlation reflects the construction speed of the building by the current construction team; after the constructed area is divided in the digital twin, the remaining area is the unconstructed area. By combining the building modules in the unconstructed area, the correlation between the constructed area and the construction time obtained in the previous steps is used to calculate the construction time required for each module in the unconstructed area. For example, the construction time of a 10-meter beam in the constructed area is 2 and a half days, then according to this correlation, the 20-meter beam in the unconstructed area can be regarded as requiring 5 days of construction time.

[0019] S200, obtaining a construction plan, identifying the construction sequence of each module in the remaining unconstructed area, predicting the construction time period of each module in the remaining unconstructed area with a digital twin according to the construction sequence and construction time length, obtaining the construction time period of each module, substituting it into the engineering cost reference model, and obtaining the engineering cost reference value. The engineering cost reference model is specifically: ; in, is the reference value of the project cost. is the number of modules in the remaining unbuilt area, is the number of material types under the nth module in the unbuilt area, is the starting point of the construction period of the nth module in the unbuilt area. is the end point of the construction period of the nth module in the unbuilt area, is the function of the price fluctuation of the mth type of material over time, is the demand for the mth type of material in the nth module; It should be noted that the construction plan is the construction sequence of each building module formulated in the early stage of building design to arrange reasonable construction. In the remaining unconstructed area, the construction sequence of each module can be obtained according to the construction plan, that is, the load-bearing wall of module B is constructed after the load-bearing beam of module A is constructed. After identifying the sequence, the construction time length of each module calculated in the above steps is used to simulate the construction progress in the digital twin, and the construction time period of each module in the unconstructed area can be predicted. For example, the A beam in the unconstructed area is calculated to take 1 day in the above steps, and the construction of wall B, which can be constructed only after the A beam is constructed, takes 2 days. The construction time periods of the two modules are 0-1 days for the A beam and 1-3 days for the B wall, respectively. In this way, the corresponding construction time period is obtained and substituted into the preset engineering cost reference model; The construction cost considered in this embodiment is mainly the purchase cost of building materials. Each module is composed of various types of raw materials, such as steel, sand, concrete, etc., which can complete the construction of a module. When calculating the cost of the module, it is necessary to calculate the prices of multiple materials. The construction period of the module can also be regarded as the purchase price time of the corresponding building materials. Although the purchase should be completed before the construction of the module, there are a large number of modules in the construction and the actual purchase price cannot be limited to the time period price by only a certain instantaneous price. There is a lack of macro fluctuations. Therefore, the construction cost reference model takes the average value of the fluctuating price within the construction period in the form of integration and division by the length of the time period, and multiplies it by the corresponding material demand, that is, the average value of the fluctuation price within the module construction period is obtained. The purchase price of a certain material in terms of demand; for price fluctuations of various types of materials, based on big data analysis of material prices, by collecting a large amount of market data, using data mining software such as MATLAB and SAS to establish a prediction model, simulate and calculate material prices, predict results, and refer to the price changes of materials in similar historical buildings, analyze historical data to predict the material prices of the current building modules, identify price trends, and finally obtain a relationship model of material prices changing over time, with the starting point of the relationship model being the current real-time time; in the construction plan and BIM model, the demand for various materials will be set according to the size and structure of the building modules; the reference value of the engineering cost can be calculated through the engineering cost reference model, and this reference value is only a forecast trend at the current moment.

[0020] S300, obtaining a planned value of the engineering cost, comparing the engineering cost reference value with the planned value of the engineering cost, and issuing a prompt if the difference exceeds a preset threshold.

[0021] It should be noted that this embodiment only considers the project cost of material procurement. The project cost will be carried out in advance before construction, and the funds required for procurement of the construction project will be estimated based on the project cost planning value. In the aforementioned steps, real-time project cost calculation is performed during the construction process to control the demand funds for the remaining unconstructed areas. The project cost planning value and the sum of the consumed material procurement funds can be subtracted from the project cost reference value. The difference reflects the fluctuation of the project cost funds. When the difference is greater than the preset threshold, the fluctuation is large, and there is a risk in controlling the construction funds. Therefore, a prompt needs to be issued to allow the cost control personnel to revise the plan for subsequent construction.

[0022] In this embodiment, a corresponding building digital twin is established based on the BIM model, and the correlation between the constructed area and the construction time length is obtained based on real-time building data. The time required for each building module in the remaining unconstructed area of ​​the digital twin and the distribution time period are used to bring the obtained construction time period into the project cost prediction model to calculate the project cost reference value. The model predicts the procurement cost of the unconstructed area under the material price fluctuations in the corresponding time period, and compares the project cost reference value with the project cost planning value to realize project cost auxiliary prompts. During the construction process, the cost can be calculated as the progress progresses, which is efficient and accurate, and the cost progress of the project construction can be controlled.

[0023] The above is a detailed description of the first embodiment of an engineering cost assistance method based on digital twins provided in this application. The following is a detailed description of the second embodiment of an engineering cost assistance method based on digital twins provided in this application.

[0024] In this embodiment, a construction cost assistance method based on digital twins is further provided. In the aforementioned step S100, the identification of the association between the constructed area and the construction time length is specifically as follows: each building module is divided in the constructed area, and the amount of each type of material consumed in the construction of each module is obtained, and the corresponding construction time length is substituted into the association model between the constructed area and the construction time length to obtain the association relationship between the constructed area and the construction time length. The association model between the constructed area and the construction time length is: ; in, is the construction time length of the cth module, is the influence coefficient of the cth module type on the construction time, is the number of material types in the cth module, is the demand for the ith material type under the cth module, is the influence coefficient of the i-th material type on the construction time; different building module types have different construction difficulties, so different module types have different corresponding construction time influence coefficients. The more building materials are required in the building module, the larger the size of the module is. The material quantity and construction time length of the same type of building modules in the constructed area are respectively substituted into the association model of the constructed area and the construction time length, and the aforementioned multiple influence coefficients can be constructed to establish an association relationship. When it is necessary to calculate the construction time length required for the module in the unconstructed area in the future, the demand for each material of the module can be brought in for prediction.

[0025] Furthermore, in the aforementioned step S200, after obtaining the construction time period of each module, it also includes: calculating the labor cost of the project cost according to the construction type and construction time period of each module, and revising the reference value of the project cost; in the project cost, in addition to the purchase cost of materials, there is also personnel cost, and the personnel cost is related to the employment time and the type of employment. Therefore, after obtaining the construction type of each module, different types of work correspond to different construction types. According to different types of work such as plumbers, carpenters, plasterers, reinforcement workers, concrete workers, painters, etc., the market labor unit time cost can be multiplied by the length of construction time to obtain the labor cost of the project cost, and the labor cost is added to the cost of material procurement calculated in the aforementioned step to obtain the revised project cost, which is then compared with the reference value of the project cost.

[0026] The above is a detailed description of an engineering cost assistance method based on digital twins provided in the first aspect of the present application. The following is a detailed description of an embodiment of an engineering cost assistance system based on digital twins provided in the second aspect of the present application.

[0027] See also Figure 2 , Figure 2 This embodiment provides an engineering cost assistance system based on digital twins, including: The construction time relationship analysis module 10 is used to obtain the BIM model of the building to be constructed, and build the corresponding building digital twin based on the BIM model of the building to be constructed; obtain real-time construction data, obtain the current constructed area and the corresponding construction time length, and identify the correlation between the constructed area and the construction time length; identify the remaining unconstructed area, and obtain the construction time length of each module according to the correlation between the constructed area and the construction time length; The engineering cost calculation module 20 is used to obtain the construction plan, identify the construction sequence of each module in the remaining unconstructed area, and predict the construction time period of each module in the remaining unconstructed area with the digital twin according to the construction sequence and construction time length, obtain the construction time period of each module, substitute it into the engineering cost reference model, and obtain the engineering cost reference value. The engineering cost reference model is specifically: ; in, is the reference value of the project cost. is the number of modules in the remaining unbuilt area, is the number of material types under the nth module in the unbuilt area, is the starting point of the construction period of the nth module in the unbuilt area, is the end point of the construction period of the nth module in the unbuilt area, is the function of the price fluctuation of the mth type of material over time, is the demand for the mth type of material in the nth module; The cost auxiliary prompt module 30 is used to obtain the project cost planning value, compare the project cost reference value with the project cost planning value, and issue a prompt if the difference exceeds a preset threshold.

[0028] Furthermore, in the construction time relationship analysis module 10, the association relationship between the constructed area and the construction time length is specifically identified as follows: each building module is divided in the constructed area, and the amount of each type of material consumed in the construction of each module is obtained, and the corresponding construction time length is substituted into the association model between the constructed area and the construction time length to obtain the association relationship between the constructed area and the construction time length. The association model between the constructed area and the construction time length is: ; in, is the construction time length of the cth module, is the influence coefficient of the cth module type on the construction time, is the number of material types in the cth module, is the demand for the ith material type under the cth module, is the influence coefficient of the i-th material type on the construction time.

[0029] Furthermore, in the engineering cost calculation module 20, after obtaining the construction time period of each module, the following is further included: According to the construction type and construction time period of each module, the labor cost of the project cost is calculated and the reference value of the project cost is revised.

[0030] The third aspect of the present application also provides an engineering cost assistance method device based on digital twins, including a processor and a memory: the memory is used to store program code and transfer the program code to the processor; the processor is used to execute the above-mentioned engineering cost assistance method based on digital twins according to the instructions in the program code.

[0031] The fourth aspect of the present application provides a computer-readable storage medium, which is used to store program code, and the program code is used to execute the above-mentioned engineering cost assistance method based on digital twins.

[0032] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and equipment can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0033] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0034] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0035] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0036] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0037] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A digital twin-based engineering cost assistance method, characterized by include: Obtain the BIM model of the building to be constructed, and build the corresponding building digital twin based on the BIM model of the building to be constructed; obtain real-time construction data, obtain the current constructed area and the corresponding construction time length, and identify the correlation between the constructed area and the construction time length; identify the remaining unconstructed area, and obtain the construction time length of each module based on the correlation between the constructed area and the construction time length; Obtain the construction plan, identify the construction sequence of each module in the remaining unbuilt area, and use the digital twin to predict the construction time period of each module in the remaining unbuilt area according to the construction sequence and construction time length, obtain the construction time period of each module, substitute it into the engineering cost reference model, and obtain the engineering cost reference value. The engineering cost reference model is specifically: ； in, is the reference value of the project cost. is the number of modules in the remaining unbuilt area, is the number of material types under the nth module in the unbuilt area, is the starting point of the construction period of the nth module in the unbuilt area, is the end point of the construction period of the nth module in the unbuilt area, is the function of the price fluctuation of the mth type of material over time, is the demand for the mth type of material in the nth module; Obtain the project cost planning value, compare the project cost reference value with the project cost planning value, and issue a prompt if the difference exceeds the preset threshold.

2. According to the digital twin-based engineering cost assistance method of claim 1, it is characterized in that: The identification of the correlation between the constructed area and the construction time length is specifically as follows: each building module is divided in the constructed area, and the amount of each type of material consumed in the construction of each module is obtained, and the corresponding construction time length is substituted into the correlation model between the constructed area and the construction time length to obtain the correlation between the constructed area and the construction time length. The correlation model between the constructed area and the construction time length is: ； in, is the construction time length of the cth module, is the influence coefficient of the cth module type on the construction time, is the number of material types in the cth module, is the demand for the ith material type under the cth module, is the influence coefficient of the i-th material type on the construction time.

3. The engineering cost auxiliary method based on digital twin according to claim 1 is characterized in that: After obtaining the construction time period of each module, the following steps are further included: According to the construction type and construction time period of each module, the labor cost of the project cost is calculated and the reference value of the project cost is revised.

4. An engineering cost auxiliary system based on digital twins, characterized in that: include: The construction time relationship analysis module is used to obtain the BIM model of the building to be constructed, and build the corresponding building digital twin based on the BIM model of the building to be constructed; obtain real-time construction data, obtain the current constructed area and the corresponding construction time length, and identify the correlation between the constructed area and the construction time length; identify the remaining unconstructed area, and obtain the construction time length of each module according to the correlation between the constructed area and the construction time length; The engineering cost calculation module is used to obtain the construction plan, identify the construction sequence of each module in the remaining unconstructed area, and predict the construction time period of each module in the remaining unconstructed area with the digital twin according to the construction sequence and construction time length, and obtain the construction time period of each module, and substitute it into the engineering cost reference model to obtain the engineering cost reference value. The engineering cost reference model is specifically: ； in, is the reference value of the project cost. is the number of modules in the remaining unbuilt area, is the number of material types under the nth module in the unbuilt area, is the starting point of the construction period of the nth module in the unbuilt area, is the end point of the construction period of the nth module in the unbuilt area, is the function of the price fluctuation of the mth type of material over time, is the demand for the mth type of material in the nth module; The cost auxiliary prompt module is used to obtain the engineering cost planning value, compare the engineering cost reference value with the engineering cost planning value, and issue a prompt if the difference exceeds a preset threshold.

5. The engineering cost auxiliary system based on digital twin according to claim 4 is characterized in that: In the construction time relationship analysis module, the association relationship between the constructed area and the construction time length is specifically identified as follows: each building module is divided in the constructed area, and the amount of each type of material consumed in the construction of each module is obtained, and the corresponding construction time length is substituted into the association model between the constructed area and the construction time length to obtain the association relationship between the constructed area and the construction time length. The association model between the constructed area and the construction time length is: ； in, is the construction time length of the cth module, is the influence coefficient of the cth module type on the construction time, is the number of material types in the cth module, is the demand for the ith material type under the cth module, is the influence coefficient of the i-th material type on the construction time.

6. The engineering cost auxiliary system based on digital twin according to claim 4 is characterized in that: In the engineering cost calculation module, after obtaining the construction time period of each module, the following steps are also included: According to the construction type and construction time period of each module, the labor cost of the project cost is calculated and the reference value of the project cost is revised.

7. An engineering cost auxiliary device based on digital twin, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute an engineering cost assistance method based on digital twins as described in any one of claims 1 to 3 according to the instructions in the program code.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program code, and the program code is used to execute an engineering cost assistance method based on digital twins as described in any one of claims 1 to 3.

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